CN203685118U

CN203685118U - Multilevel hydraulic bridge plug setting device

Info

Publication number: CN203685118U
Application number: CN201320568891.1U
Authority: CN
Inventors: 谭文波; 汪永平; 贾武强; 刘成; 李洋
Original assignee: CNPC Xibu Drilling Engineering Co Ltd
Current assignee: CNPC Xibu Drilling Engineering Co Ltd
Priority date: 2013-09-13
Filing date: 2013-09-13
Publication date: 2014-07-02
Anticipated expiration: 2023-09-13

Abstract

The utility model relates to the technical field of a bridge plug setting device, in particular to a multilevel hydraulic bridge plug setting device; The multilevel hydraulic bridge plug setting device comprises a drive device, an upper connecting device, a hydraulic pump, a one-way valve, a transmission shaft, a piston rod and a lower connecting device; an upper connector is fixedly installed outside the lower part of the drive device, the upper inner side of the upper connecting device is fixedly connected with the lower outer side of the upper connector, and the lower inner side of the upper connecting device is fixedly connected with the upper outer side of the one-way valve. The multilevel hydraulic bridge plug setting device is reasonable and compact in structure and convenient to use; when in pressing, a shear pin is cut off, so that the lower connecting device moves downwards to be disconnected with a bridge plug, and the underground stratum is closed by the setting bridge plug; after the bridge plug is set, the bridge plug is restored to an initial state by unscrewing a pressure cap on the one-way valve to release the pressure, the bridge plug is unnecessary to disassemble to maintain, the characteristics of safety, reliability and repeatability in use can be realized, the safety potential danger can be prevented, the production cost and the labor intensity of the operation personnel can be reduced, and the production efficiency can be improved.

Description

Multistage hydraulic bridging plug seating and sealing unit

Technical field

the utility model relates to bridging plug seating and sealing unit technical field, is a kind of multistage hydraulic bridging plug seating and sealing unit.

Background technology

because setting bridging plug stratum closing process, cable there is short construction period, the features such as the accurate location of bridging plug envelope potential energy and operating expenses are cheap, in the stratum sealing technique of each elephant, generally adopt at home, but traditional bridging plug setting tool has the blast of the employing of need percussion powder to provide the cable that power sets to set bridging plug instrument, three kinds of the setting tools that simple electronic setting tool and the pitching of tubing transmission ground are suppressed, but there are following problems in these three kinds of setting tools: 1. electric cable bridge plug setting tool and the every use of tubing transmission ground pitching setting tool once all will be disintegrated maintenance once, increase operating personnel's labour intensity, and each accessory bag that all needs the instrument of changing, cost is high, and be prone to assembling error, thereby cause the generation of down-hole accident, 2. though simple electronic bridging plug setting tool is reusable, use motor to carry out return, motor reuse the application life that affect motor, the while also affects the application life of cable.Current each oil field is more and more higher to the requirement of construction quality, also more and more tighter to the control of cost, simultaneously to people's protection also gradually strengthen, so existing bridging plug setting tool can not meet the requirement of existing technique.

Summary of the invention

the utility model provides a kind of multistage hydraulic bridging plug seating and sealing unit, has overcome the deficiency of above-mentioned prior art, and it can effectively solve existing bridging plug setting tool and can not meet the problem of existing technological requirement.

the technical solution of the utility model realizes by following measures: a kind of multistage hydraulic bridging plug seating and sealing unit, comprises drive unit, upper linkage, hydraulic pump, one way valve, power transmission shaft, piston rod and lower connecting device; Lower outside at drive unit is installed with top connection, the inner side, upper end of upper linkage and the lower outside of top connection are fixedly installed togather, the inner side, lower end of upper linkage and the upper outside of one way valve are fixedly installed togather, and the inner side, upper end of lower connecting device and the lower outside of one way valve are fixed together by the shear pin of at least one; The clutch end of drive unit and one end of power transmission shaft are fixedly installed togather by connecting key bar, the other end of power transmission shaft and the power intake of hydraulic pump are fixedly installed togather, the port of export of hydraulic pump and the liquid feeding end of one way valve are fixedly installed togather, the outlet end of one way valve and one end of piston rod are fixedly installed togather, have vertically circulation passage at the middle part of piston rod and be connected with the outlet end of one way valve, in the lower end of piston rod, one is fixed with the plug that can block circulation passage; Power transmission shaft is set in the inner side of top connection and upper linkage, between top connection, upper linkage, one way valve, hydraulic pump and power transmission shaft, form upper liquid storage cylinder and lower liquid storage cylinder, on upper linkage, have the intercommunicating pore being connected with upper liquid storage cylinder and lower liquid storage cylinder of at least one; Inner side at lower connecting device is fixed with the interior ring platform of at least two in interval from top to bottom, interior ring platform is sleeved on the outside of piston rod, on the piston rod between one way valve and adjacent interior ring platform, be fixed with respectively piston on the piston rod of position on the lower between adjacent two interior ring platforms, piston bush is contained in the inner side of lower connecting device, between piston and adjacent interior ring platform, form respectively hydraulic cavities, the inlet opening being connected with circulation passage and corresponding hydraulic cavities that has at least one along circumference respectively on piston rod.

the further optimization and/or improvements to above-mentioned utility model technical scheme below:

above-mentioned lower connecting device comprises the first cylindrical shell, the second cylindrical shell and the 3rd cylindrical shell, the first cylindrical shell and the second cylindrical shell are fixedly installed togather by the first joint, the second cylindrical shell and the 3rd cylindrical shell are fixedly installed togather by the second joint, the inner side, upper end of the first cylindrical shell and the lower outside of one way valve are fixed together by the shear pin of at least one, are fixed with respectively interior ring platform in the lower inside of the first cylindrical shell, the second cylindrical shell and the 3rd cylindrical shell, piston rod comprises head rod, the second connecting rod and the 3rd connecting rod, head rod, the second connecting rod and the 3rd connecting rod are fixedly installed togather by snap close successively, the upper end of head rod and the outlet end of one way valve are fixedly installed togather, at head rod, the outside, middle part of the second connecting rod and the 3rd connecting rod respectively one is fixed with piston, head rod, piston on the second connecting rod and the 3rd connecting rod is set in the first cylindrical shell, on the second cylindrical shell and the 3rd cylindrical shell, the first joint and the second joint are set on the second cylindrical shell and the 3rd cylindrical shell, the first cylindrical shell, interior ring platform on the second cylindrical shell and the 3rd cylindrical shell is set in head rod, on the second connecting rod and the 3rd connecting rod, between piston on interior ring platform and the 3rd connecting rod between piston on interior ring platform and the second connecting rod between piston on interior ring platform and head rod on the first cylindrical shell, on the second cylindrical shell, on the 3rd cylindrical shell, form respectively hydraulic cavities, there is respectively vertically circulation passage at the middle part of the first cylindrical shell, the second cylindrical shell and the 3rd cylindrical shell and be connected with the outlet end of one way valve, being fixed with in the lower end one of the 3rd cylindrical shell the plug that can block circulation passage, the inlet opening being connected with circulation passage and corresponding hydraulic cavities that has respectively at least one along circumference on the first cylindrical shell, the second cylindrical shell and the 3rd cylindrical shell.

above-mentioned upper linkage comprises connecting cylinder, transition joint and lower connecting cylinder; The inner side, upper end of upper connecting cylinder and the lower outside of top connection are fixedly installed togather, the inner side, lower end of upper connecting cylinder and the upper outside of transition joint are fixedly installed togather, the inner side, upper end of lower connecting cylinder and the lower outside of transition joint are fixedly installed togather, the inner side, lower end of lower connecting cylinder and the upper outside of one way valve are fixedly installed togather, and are installed with hydraulic pump adapter sleeve between hydraulic pump and one way valve; Transition joint is sleeved on power transmission shaft, upper liquid storage cylinder between top connection, upper connecting cylinder, transition joint and power transmission shaft, between transition joint, lower connecting cylinder, one way valve, hydraulic pump adapter sleeve, hydraulic pump and power transmission shaft, form lower liquid storage cylinder, in transition joint, have vertically the intercommunicating pore being connected with upper liquid storage cylinder and lower liquid storage cylinder of at least one.

above-mentioned drive unit is motor, is installed with key bar adapter sleeve on motor, and key bar adapter sleeve is between connecting key bar and top connection; Be installed with the 3rd joint in the lower end of the 3rd cylindrical shell, the 3rd fitting sleeve is contained on plug.

above-mentioned one way valve comprises valve body, ball sealer and pressure cap; Inside at valve body has fluid course vertically, the installing hole and the opening that radially have respectively diameter that be connected with fluid course, from outside to inside to reduce successively in the right side central of valve body, ball sealer be positioned at installing hole left part and seat on opening, on installing hole, be installed with pressure cap and be pressed on ball sealer, having vertically in the right upper portion of valve body the spill port being connected with the left part of installing hole; Spill port and lower liquid storage cylinder are connected, the port of export of hydraulic pump and the liquid feeding end of valve body is fixedly installed togather and be connected with fluid course, the inner side, lower end of lower connecting cylinder and the upper outside of valve body are fixedly installed togather, and the inner side, upper end of the first cylindrical shell and the lower outside of valve body are fixed together by the shear pin of at least one.

external screw thread is arranged at the above-mentioned top at valve body; Valve body is step-like that middle part external diameter is large, upper and lower external diameter is little.

above-mentioned have opening on the outer face of pressure cap; The external diameter of ball sealer is greater than the internal diameter of spill port; On the inwall of installing hole, have internal thread, pressure cap is fixedly mounted on installing hole by screw thread; There is at least one sealing mounting groove along circumference in the valve body upper outside near installing hole.

above-mentioned motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

the utility model reasonable and compact in structure, easy to use, while suppressing, thereby shear pin is cut off and lower connecting device is moved down disconnect and being connected of bridging plug, realize down-hole and set bridging plug sealing stratum, after bridging plug sets, by after loosening the pressure cap pressure release on one way valve and be reset to original state, do not need dismounting maintenance, there is safe and reliable and reusable feature, stop potential safety hazard, reduced cost of production and operating personnel's labour intensity, improved production efficiency.

Accompanying drawing explanation

the master that accompanying drawing 1 is the utility model most preferred embodiment looks sectional structure schematic diagram.

the master that accompanying drawing 2 is one way valve in the utility model is depending on analysing and observe structure for amplifying schematic diagram.

coding in accompanying drawing is respectively: 1 is valve body, 2 is ball sealer, 3 is pressure cap, 4 is fluid course, 5 is installing hole, 6 is opening, 7 is spill port, 8 is opening, 9 is sealing mounting groove, 10 is one way valve, 11 is power transmission shaft, 12 is top connection, 13 is shear pin, 14 is connecting key bar, 15 is hydraulic pump, 16 is circulation passage, 17 is plug, 18 is upper liquid storage cylinder, 19 is lower liquid storage cylinder, 20 is intercommunicating pore, 21 is interior ring platform, 22 is piston, 23 is hydraulic cavities, 24 is inlet opening, 25 is the first cylindrical shell, 26 is the second cylindrical shell, 27 is the 3rd cylindrical shell, 28 is the first joint, 29 is the second joint, 30 is head rod, 31 is the second connecting rod, 32 is the 3rd connecting rod, 33 is snap close, 34 is upper connecting cylinder, 35 is transition joint, 36 is lower connecting cylinder, 37 is hydraulic pump adapter sleeve, 38 is motor, 39 is key bar adapter sleeve, 40 is lower contact, 41 is V-shaped seal ring, 42 is O RunddichtringO, 43 for setting cylinder, 44 is bridging plug pull bar.

The specific embodiment

the utility model is not subject to the restriction of following embodiment, can determine concrete embodiment according to the technical solution of the utility model and actual conditions.

in the utility model, for convenience of description, the description of the relative position relation of each parts is to be all described according to the Butut mode of manual 1, as: the position relationship of forward and backward, upper and lower, left and right etc. is to determine according to the Butut direction of Figure of description 1.

below in conjunction with embodiment and accompanying drawing, the utility model is further described:

as shown in Figure 1, this multistage hydraulic bridging plug seating and sealing unit comprises drive unit, upper linkage, hydraulic pump 15, one way valve 10, power transmission shaft 11, piston rod and lower connecting device; Be installed with top connection 12 at the lower outside of drive unit, the inner side, upper end of upper linkage and the lower outside of top connection 12 are fixedly installed togather, the inner side, lower end of upper linkage and the upper outside of one way valve 10 are fixedly installed togather, and the inner side, upper end of lower connecting device and the lower outside of one way valve 10 are fixed together by the shear pin 13 of at least one; One end of the clutch end of drive unit and power transmission shaft 11 is fixedly installed togather by connecting key bar 14, the power intake of the other end of power transmission shaft 11 and hydraulic pump 15 is fixedly installed togather, the liquid feeding end of the port of export of hydraulic pump 15 and one way valve 10 is fixedly installed togather, the outlet end of one way valve 10 and one end of piston rod are fixedly installed togather, there is vertically circulation passage 16 at the middle part of piston rod and be connected with the outlet end of one way valve 10, being fixed with the plug 17 that can block circulation passage 16 in the lower end of piston rod one; Power transmission shaft 11 is set in the inner side of top connection 12 and upper linkage, between top connection 12, upper linkage, one way valve 10, hydraulic pump 15 and power transmission shaft 11, form upper liquid storage cylinder 18 and lower liquid storage cylinder 19, on upper linkage, have the intercommunicating pore 20 being connected with upper liquid storage cylinder 18 and lower liquid storage cylinder 19 of at least one; Inner side at lower connecting device is fixed with the interior ring platform 21 of at least two in interval from top to bottom, interior ring platform 21 is sleeved on the outside of piston rod, on the piston rod between one way valve 10 and adjacent interior ring platform 21, be fixed with respectively piston 22 on the piston rod of position on the lower between adjacent two interior ring platforms 21, piston 22 is sleeved on the inner side of lower connecting device, between piston 22 and adjacent interior ring platform 21, form respectively hydraulic cavities 23, the inlet opening 24 being connected with circulation passage 16 and corresponding hydraulic cavities 23 that has at least one along circumference respectively on piston rod.

can according to actual needs, above-mentioned multistage hydraulic bridging plug seating and sealing unit be made further optimization and/or improvements:

as shown in Figure 1, lower connecting device comprises the first cylindrical shell 25, the second cylindrical shell 26 and the 3rd cylindrical shell 27, the first cylindrical shell 25 and the second cylindrical shell 26 are fixedly installed togather by the first joint 28, the second cylindrical shell 26 and the 3rd cylindrical shell 27 are fixedly installed togather by the second joint 29, the inner side, upper end of the first cylindrical shell 25 and the lower outside of one way valve 10 are fixed together by the shear pin 13 of at least one, are fixed with respectively interior ring platform 21 in the lower inside of the first cylindrical shell 25, the second cylindrical shell 26 and the 3rd cylindrical shell 27, piston rod comprises head rod 30, the second connecting rod 31 and the 3rd connecting rod 32, head rod 30, the second connecting rod 31 and the 3rd connecting rod 32 are fixedly installed togather by snap close 33 successively, the outlet end of the upper end of head rod 30 and one way valve 10 is fixedly installed togather, at head rod 30, the outside, middle part of the second connecting rod 31 and the 3rd connecting rod 32 respectively one is fixed with piston 22, head rod 30, piston 22 on the second connecting rod 31 and the 3rd connecting rod 32 is set in the first cylindrical shell 25, on the second cylindrical shell 26 and the 3rd cylindrical shell 27, the first joint 28 and the second joint 29 are set on the second cylindrical shell 26 and the 3rd cylindrical shell 27, the first cylindrical shell 25, interior ring platform 21 on the second cylindrical shell 26 and the 3rd cylindrical shell 27 is set in head rod 30, on the second connecting rod 31 and the 3rd connecting rod 32, between piston 22 on interior ring platform 21 and the 3rd connecting rod 32 between piston 22 on interior ring platform 21 and the second connecting rod 31 between piston 22 on interior ring platform 21 and head rod 30 on the first cylindrical shell 25, on the second cylindrical shell 26, on the 3rd cylindrical shell 27, form respectively hydraulic cavities 23, there is respectively vertically circulation passage 16 and be connected with the outlet end of one way valve 10 at the middle part of the first cylindrical shell 25, the second cylindrical shell 26 and the 3rd cylindrical shell 27, being fixed with the plug 17 that can block circulation passage 16 in the lower end one of the 3rd cylindrical shell 27, the inlet opening 24 being connected with circulation passage 16 and corresponding hydraulic cavities 23 that has respectively at least one along circumference on the first cylindrical shell 25, the second cylindrical shell 26 and the 3rd cylindrical shell 27.

as shown in Figure 1, upper linkage comprises connecting cylinder 34, transition joint 35 and lower connecting cylinder 36; The inner side, upper end of upper connecting cylinder 34 and the lower outside of top connection 12 are fixedly installed togather, the inner side, lower end of upper connecting cylinder 34 and the upper outside of transition joint 35 are fixedly installed togather, the inner side, upper end of lower connecting cylinder 36 and the lower outside of transition joint 35 are fixedly installed togather, the inner side, lower end of lower connecting cylinder 36 and the upper outside of one way valve 10 are fixedly installed togather, and between hydraulic pump 15 and one way valve 10, are installed with hydraulic pump adapter sleeve 37; Transition joint 35 is sleeved on power transmission shaft 11, upper liquid storage cylinder 18 between top connection 12, upper connecting cylinder 34, transition joint 35 and power transmission shaft 11, between transition joint 35, lower connecting cylinder 36, one way valve 10, hydraulic pump adapter sleeve 37, hydraulic pump 15 and power transmission shaft 11, form lower liquid storage cylinder 19, in transition joint 35, have vertically the intercommunicating pore 20 being connected with upper liquid storage cylinder 18 and lower liquid storage cylinder 19 of at least one.Like this, transition joint 35 has prevented that flexural buckling from appearring in power transmission shaft 11 in transmission process.

as shown in Figure 1, drive unit is motor 38, is installed with key bar adapter sleeve 39 on motor 38, and key bar adapter sleeve 39 is between connecting key bar 14 and top connection 12; Be installed with lower contact 40 in the lower end of the 3rd cylindrical shell 27, lower contact 40 is sleeved on plug 17.When use, lower contact 40 is fixedly mounted on and sets on cylinder 43, and plug 17 is fixedly mounted on bridging plug pull bar 44.

as shown in accompanying drawing 1,2, one way valve 10 comprises valve body 1, ball sealer 2 and pressure cap 3; Inside at valve body 1 has fluid course 4 vertically, radially there are respectively the installing hole 5 and the opening 6 that reduce successively with fluid course 4 diameter that be connected, from outside to inside in the right side central of valve body 1, ball sealer 2 be positioned at installing hole 5 left part and seat on opening 6, on installing hole 5, be installed with pressure cap 3 and be pressed on ball sealer 2, having vertically the spill port 7 being connected with the left part of installing hole 5 in the right upper portion of valve body 1; Spill port 7 and lower liquid storage cylinder 19 are connected, the liquid feeding end of the port of export of hydraulic pump 15 and valve body 1 is fixedly installed togather and is connected with fluid course 4, the inner side, lower end of lower connecting cylinder 36 and the upper outside of valve body 1 are fixedly installed togather, and the inner side, upper end of the first cylindrical shell 25 and the lower outside of valve body 1 are fixed together by the shear pin 13 of at least one.

as shown in accompanying drawing 1,2, there is external screw thread on the top of valve body 1; Valve body 1 is step-like that middle part external diameter is large, upper and lower external diameter is little.

as shown in accompanying drawing 1,2, on the outer face of pressure cap 3, be provided with opening 8; The external diameter of ball sealer 2 is greater than the internal diameter of spill port 7; On the inwall of installing hole 5, have internal thread, pressure cap 3 is fixedly mounted on installing hole 5 by screw thread; There is at least one sealing mounting groove 9 along circumference in valve body 1 upper outside near installing hole 5.Like this, be provided with opening 8 on the outer face of pressure cap 3, instrument easy to use tightens pressure cap 3 or loosens pressure cap 3; The external diameter of ball sealer 2 is greater than the internal diameter of spill port 7, prevents that ball sealer 2 from entering in spill port 7.On the inwall of installing hole 5, there is internal thread, be convenient to the installation and removal of pressure cap 3.

as shown in Figure 1, motor 38 and top connection 12 are fixedly installed togather by bolt and screw rod, power transmission shaft 11 and hydraulic pump 15 are fixedly installed togather by bolt and screw rod, top connection 12 and upper connecting cylinder 34 are fixedly installed togather by screw thread, upper connecting cylinder 34 and transition joint 35 are fixedly installed togather by screw thread, transition joint 35 and lower connecting cylinder 36 are fixedly installed togather by screw thread, lower connecting cylinder 36 and one way valve 10 are fixedly installed togather by screw thread, the first cylindrical shell 25 and the second cylindrical shell 26 respectively with the first joints 28 are fixedly installed togather by screw thread, the second cylindrical shell 26 and the 3rd cylindrical shell 27 respectively with the second joints 29 are fixedly installed togather by screw thread, head rod 30 and one way valve 10 are fixedly installed togather by screw thread, between top connection 12 and power transmission shaft 11, be installed with V-shaped seal ring 41, between transition joint 35 and power transmission shaft 11, be installed with V-shaped seal ring 41, between top connection 12 and upper connecting cylinder 34, be installed with O RunddichtringO 42 at least together, between top connection 12 and transition joint 35, be installed with O RunddichtringO 42 at least together, between transition joint 35 and lower connecting cylinder 36, be installed with O RunddichtringO 42 at least together, between lower connecting cylinder 36 and one way valve 10, be installed with O RunddichtringO 42 at least together, between one way valve 10 and the first cylindrical shell 25, be installed with O RunddichtringO 42 at least together, O RunddichtringO 42 together with being installed with respectively at least between the first cylindrical shell 25 and the second cylindrical shell 26 and the first joint 28, O RunddichtringO 42 together with being installed with respectively at least between the second cylindrical shell 26 and the 3rd cylindrical shell 27 and the second joint 29, between the 3rd cylindrical shell 27 and lower contact 40, be installed with O RunddichtringO 42 at least together, between piston 22 on head rod 30 and the first cylindrical shell 25, be installed with O RunddichtringO 42 at least together, between piston 22 on the second connecting rod 31 and the second cylindrical shell 26, be installed with O RunddichtringO 42 at least together, between piston 22 on the 3rd connecting rod 32 and the 3rd cylindrical shell 27, be installed with O RunddichtringO 42 at least together, between interior ring platform 21 on the first cylindrical shell 25 and head rod 30, be installed with O RunddichtringO 42 at least together, between interior ring platform 21 on the second cylindrical shell 26 and the second connecting rod 31, be installed with O RunddichtringO 42 at least together, between interior ring platform 21 on the 3rd cylindrical shell 27 and the 3rd connecting rod 32, be installed with O RunddichtringO 42 at least together, between lower contact 40 and plug 17, be installed with O RunddichtringO 42 at least together.Like this, V-shaped seal ring 41 and O RunddichtringO 42 are convenient to better sealing.

above technical characterictic has formed most preferred embodiment of the present utility model, and it has stronger compliance and best implementation result, can increase and decrease according to actual needs non-essential technical characterictic, meets the demand of different situations.

the use procedure of the utility model most preferred embodiment: when use, lower contact 40 is fixedly mounted on and is set on cylinder 43, plug 17 is fixedly mounted on bridging plug pull bar 44, the output of motor 38 drives hydraulic pump 15 to rotate by power transmission shaft 11, the liquid in upper liquid storage cylinder 18 and lower liquid storage cylinder 19 is passed through the fluid course 4 on one way valve 10 by hydraulic pump 15, head rod 30, circulation passage 16 on the second connecting rod 31 and the 3rd connecting rod 32 and inlet opening 24 enter in each hydraulic cavities 23, the each interior ring platform 21 of liquid extruding in each hydraulic cavities 23, shear pin 13 is cut off and is made the first cylindrical shell 25, the second cylindrical shell 26, the 3rd cylindrical shell 27, the first joint 28, the second joint 29 and lower contact 40 are descending, promote bridging plug by the cylinder 43 that sets being connected in lower contact 40, because discharging ring, bridging plug is connected on plug 17 by bridging plug pull bar 44, therefore setting cylinder 43 promotes bridging plug slips and struts and be fixed on casing wall, continue descending promotion bridging plug stripper rubber and strut Sealed casing pipe top and the bottom, continue descending, in the time that descending power is greater than the relay of bridging plug release ring, descending power is broken and is discharged ring, thereby disconnection the utility model is connected with bridging plug, realize the object that down-hole sets bridging plug sealing stratum, after under completed well, bridging plug sets, to on the utility model, carry to ground, loosen the pressure cap on one way valve 10 with flat mouthful bottle opener, liquid-driving ball sealer in each hydraulic cavities 23 is up, the spill port of opening on one way valve 10 makes in the supreme liquid storage cylinder 18 of liquid backflow and lower liquid storage cylinder 19, thereby make the first cylindrical shell 25, the second cylindrical shell 26 and the 3rd cylindrical shell 27 be reset to original state, and assemble without demounting tool.

Claims

1. a multistage hydraulic bridging plug seating and sealing unit, is characterized in that comprising drive unit, upper linkage, hydraulic pump, one way valve, power transmission shaft, piston rod and lower connecting device; Lower outside at drive unit is installed with top connection, the inner side, upper end of upper linkage and the lower outside of top connection are fixedly installed togather, the inner side, lower end of upper linkage and the upper outside of one way valve are fixedly installed togather, and the inner side, upper end of lower connecting device and the lower outside of one way valve are fixed together by the shear pin of at least one; The clutch end of drive unit and one end of power transmission shaft are fixedly installed togather by connecting key bar, the other end of power transmission shaft and the power intake of hydraulic pump are fixedly installed togather, the port of export of hydraulic pump and the liquid feeding end of one way valve are fixedly installed togather, the outlet end of one way valve and one end of piston rod are fixedly installed togather, have vertically circulation passage at the middle part of piston rod and be connected with the outlet end of one way valve, in the lower end of piston rod, one is fixed with the plug that can block circulation passage; Power transmission shaft is set in the inner side of top connection and upper linkage, between top connection, upper linkage, one way valve, hydraulic pump and power transmission shaft, form upper liquid storage cylinder and lower liquid storage cylinder, on upper linkage, have the intercommunicating pore being connected with upper liquid storage cylinder and lower liquid storage cylinder of at least one; Inner side at lower connecting device is fixed with the interior ring platform of at least two in interval from top to bottom, interior ring platform is sleeved on the outside of piston rod, on the piston rod between one way valve and adjacent interior ring platform, be fixed with respectively piston on the piston rod of position on the lower between adjacent two interior ring platforms, piston bush is contained in the inner side of lower connecting device, between piston and adjacent interior ring platform, form respectively hydraulic cavities, the inlet opening being connected with circulation passage and corresponding hydraulic cavities that has at least one along circumference respectively on piston rod.

2. multistage hydraulic bridging plug seating and sealing unit according to claim 1, is characterized in that lower connecting device comprises the first cylindrical shell, the second cylindrical shell and the 3rd cylindrical shell, the first cylindrical shell and the second cylindrical shell are fixedly installed togather by the first joint, the second cylindrical shell and the 3rd cylindrical shell are fixedly installed togather by the second joint, the inner side, upper end of the first cylindrical shell and the lower outside of one way valve are fixed together by the shear pin of at least one, are fixed with respectively interior ring platform in the lower inside of the first cylindrical shell, the second cylindrical shell and the 3rd cylindrical shell, piston rod comprises head rod, the second connecting rod and the 3rd connecting rod, head rod, the second connecting rod and the 3rd connecting rod are fixedly installed togather by snap close successively, the upper end of head rod and the outlet end of one way valve are fixedly installed togather, at head rod, the outside, middle part of the second connecting rod and the 3rd connecting rod respectively one is fixed with piston, head rod, piston on the second connecting rod and the 3rd connecting rod is set in the first cylindrical shell, on the second cylindrical shell and the 3rd cylindrical shell, the first joint and the second joint are set on the second cylindrical shell and the 3rd cylindrical shell, the first cylindrical shell, interior ring platform on the second cylindrical shell and the 3rd cylindrical shell is set in head rod, on the second connecting rod and the 3rd connecting rod, between piston on interior ring platform and the 3rd connecting rod between piston on interior ring platform and the second connecting rod between piston on interior ring platform and head rod on the first cylindrical shell, on the second cylindrical shell, on the 3rd cylindrical shell, form respectively hydraulic cavities, there is respectively vertically circulation passage at the middle part of the first cylindrical shell, the second cylindrical shell and the 3rd cylindrical shell and be connected with the outlet end of one way valve, being fixed with in the lower end one of the 3rd cylindrical shell the plug that can block circulation passage, the inlet opening being connected with circulation passage and corresponding hydraulic cavities that has respectively at least one along circumference on the first cylindrical shell, the second cylindrical shell and the 3rd cylindrical shell.

3. multistage hydraulic bridging plug seating and sealing unit according to claim 1 and 2, is characterized in that linkage comprises connecting cylinder, transition joint and lower connecting cylinder; The inner side, upper end of upper connecting cylinder and the lower outside of top connection are fixedly installed togather, the inner side, lower end of upper connecting cylinder and the upper outside of transition joint are fixedly installed togather, the inner side, upper end of lower connecting cylinder and the lower outside of transition joint are fixedly installed togather, the inner side, lower end of lower connecting cylinder and the upper outside of one way valve are fixedly installed togather, and are installed with hydraulic pump adapter sleeve between hydraulic pump and one way valve; Transition joint is sleeved on power transmission shaft, upper liquid storage cylinder between top connection, upper connecting cylinder, transition joint and power transmission shaft, between transition joint, lower connecting cylinder, one way valve, hydraulic pump adapter sleeve, hydraulic pump and power transmission shaft, form lower liquid storage cylinder, in transition joint, have vertically the intercommunicating pore being connected with upper liquid storage cylinder and lower liquid storage cylinder of at least one.

4. multistage hydraulic bridging plug seating and sealing unit according to claim 1 and 2, is characterized in that drive unit is motor, is installed with key bar adapter sleeve on motor, and key bar adapter sleeve is between connecting key bar and top connection; Be installed with the 3rd joint in the lower end of the 3rd cylindrical shell, the 3rd fitting sleeve is contained on plug.

5. multistage hydraulic bridging plug seating and sealing unit according to claim 3, is characterized in that drive unit is motor, is installed with key bar adapter sleeve on motor, and key bar adapter sleeve is between connecting key bar and top connection; Be installed with the 3rd joint in the lower end of the 3rd cylindrical shell, the 3rd fitting sleeve is contained on plug.

6. multistage hydraulic bridging plug seating and sealing unit according to claim 1 and 2, is characterized in that one way valve comprises valve body, ball sealer and pressure cap; Inside at valve body has fluid course vertically, the installing hole and the opening that radially have respectively diameter that be connected with fluid course, from outside to inside to reduce successively in the right side central of valve body, ball sealer be positioned at installing hole left part and seat on opening, on installing hole, be installed with pressure cap and be pressed on ball sealer, having vertically in the right upper portion of valve body the spill port being connected with the left part of installing hole; Spill port and lower liquid storage cylinder are connected, the port of export of hydraulic pump and the liquid feeding end of valve body is fixedly installed togather and be connected with fluid course, the inner side, lower end of lower connecting cylinder and the upper outside of valve body are fixedly installed togather, and the inner side, upper end of the first cylindrical shell and the lower outside of valve body are fixed together by the shear pin of at least one.

7. multistage hydraulic bridging plug seating and sealing unit according to claim 3, is characterized in that one way valve comprises valve body, ball sealer and pressure cap; Inside at valve body has fluid course vertically, the installing hole and the opening that radially have respectively diameter that be connected with fluid course, from outside to inside to reduce successively in the right side central of valve body, ball sealer be positioned at installing hole left part and seat on opening, on installing hole, be installed with pressure cap and be pressed on ball sealer, having vertically in the right upper portion of valve body the spill port being connected with the left part of installing hole; Spill port and lower liquid storage cylinder are connected, the port of export of hydraulic pump and the liquid feeding end of valve body is fixedly installed togather and be connected with fluid course, the inner side, lower end of lower connecting cylinder and the upper outside of valve body are fixedly installed togather, and the inner side, upper end of the first cylindrical shell and the lower outside of valve body are fixed together by the shear pin of at least one.

8. multistage hydraulic bridging plug seating and sealing unit according to claim 4, is characterized in that one way valve comprises valve body, ball sealer and pressure cap; Inside at valve body has fluid course vertically, the installing hole and the opening that radially have respectively diameter that be connected with fluid course, from outside to inside to reduce successively in the right side central of valve body, ball sealer be positioned at installing hole left part and seat on opening, on installing hole, be installed with pressure cap and be pressed on ball sealer, having vertically in the right upper portion of valve body the spill port being connected with the left part of installing hole; Spill port and lower liquid storage cylinder are connected, the port of export of hydraulic pump and the liquid feeding end of valve body is fixedly installed togather and be connected with fluid course, the inner side, lower end of lower connecting cylinder and the upper outside of valve body are fixedly installed togather, and the inner side, upper end of the first cylindrical shell and the lower outside of valve body are fixed together by the shear pin of at least one.

9. multistage hydraulic bridging plug seating and sealing unit according to claim 5, is characterized in that one way valve comprises valve body, ball sealer and pressure cap; Inside at valve body has fluid course vertically, the installing hole and the opening that radially have respectively diameter that be connected with fluid course, from outside to inside to reduce successively in the right side central of valve body, ball sealer be positioned at installing hole left part and seat on opening, on installing hole, be installed with pressure cap and be pressed on ball sealer, having vertically in the right upper portion of valve body the spill port being connected with the left part of installing hole; Spill port and lower liquid storage cylinder are connected, the port of export of hydraulic pump and the liquid feeding end of valve body is fixedly installed togather and be connected with fluid course, the inner side, lower end of lower connecting cylinder and the upper outside of valve body are fixedly installed togather, and the inner side, upper end of the first cylindrical shell and the lower outside of valve body are fixed together by the shear pin of at least one.

10. multistage hydraulic bridging plug seating and sealing unit according to claim 6, is characterized in that there is external screw thread on the top of valve body; Valve body is step-like that middle part external diameter is large, upper and lower external diameter is little.

11. multistage hydraulic bridging plug seating and sealing units according to claim 7, is characterized in that there is external screw thread on the top of valve body; Valve body is step-like that middle part external diameter is large, upper and lower external diameter is little.

12. multistage hydraulic bridging plug seating and sealing units according to claim 8, is characterized in that there is external screw thread on the top of valve body; Valve body is step-like that middle part external diameter is large, upper and lower external diameter is little.

13. multistage hydraulic bridging plug seating and sealing units according to claim 9, is characterized in that there is external screw thread on the top of valve body; Valve body is step-like that middle part external diameter is large, upper and lower external diameter is little.

14. multistage hydraulic bridging plug seating and sealing units according to claim 6, is characterized in that there is opening on the outer face of pressure cap; The external diameter of ball sealer is greater than the internal diameter of spill port; On the inwall of installing hole, have internal thread, pressure cap is fixedly mounted on installing hole by screw thread; There is at least one sealing mounting groove along circumference in the valve body upper outside near installing hole.

15. multistage hydraulic bridging plug seating and sealing units according to claim 7, is characterized in that there is opening on the outer face of pressure cap; The external diameter of ball sealer is greater than the internal diameter of spill port; On the inwall of installing hole, have internal thread, pressure cap is fixedly mounted on installing hole by screw thread; There is at least one sealing mounting groove along circumference in the valve body upper outside near installing hole.

16. multistage hydraulic bridging plug seating and sealing units according to claim 8, is characterized in that there is opening on the outer face of pressure cap; The external diameter of ball sealer is greater than the internal diameter of spill port; On the inwall of installing hole, have internal thread, pressure cap is fixedly mounted on installing hole by screw thread; There is at least one sealing mounting groove along circumference in the valve body upper outside near installing hole.

17. multistage hydraulic bridging plug seating and sealing units according to claim 9, is characterized in that there is opening on the outer face of pressure cap; The external diameter of ball sealer is greater than the internal diameter of spill port; On the inwall of installing hole, have internal thread, pressure cap is fixedly mounted on installing hole by screw thread; There is at least one sealing mounting groove along circumference in the valve body upper outside near installing hole.

18. multistage hydraulic bridging plug seating and sealing units according to claim 10, is characterized in that there is opening on the outer face of pressure cap; The external diameter of ball sealer is greater than the internal diameter of spill port; On the inwall of installing hole, have internal thread, pressure cap is fixedly mounted on installing hole by screw thread; There is at least one sealing mounting groove along circumference in the valve body upper outside near installing hole.

19. multistage hydraulic bridging plug seating and sealing units according to claim 11, is characterized in that there is opening on the outer face of pressure cap; The external diameter of ball sealer is greater than the internal diameter of spill port; On the inwall of installing hole, have internal thread, pressure cap is fixedly mounted on installing hole by screw thread; There is at least one sealing mounting groove along circumference in the valve body upper outside near installing hole.

20. multistage hydraulic bridging plug seating and sealing units according to claim 12, is characterized in that there is opening on the outer face of pressure cap; The external diameter of ball sealer is greater than the internal diameter of spill port; On the inwall of installing hole, have internal thread, pressure cap is fixedly mounted on installing hole by screw thread; There is at least one sealing mounting groove along circumference in the valve body upper outside near installing hole.

21. multistage hydraulic bridging plug seating and sealing units according to claim 13, is characterized in that there is opening on the outer face of pressure cap; The external diameter of ball sealer is greater than the internal diameter of spill port; On the inwall of installing hole, have internal thread, pressure cap is fixedly mounted on installing hole by screw thread; There is at least one sealing mounting groove along circumference in the valve body upper outside near installing hole.

22. multistage hydraulic bridging plug seating and sealing units according to claim 4, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

23. multistage hydraulic bridging plug seating and sealing units according to claim 5, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

24. multistage hydraulic bridging plug seating and sealing units according to claim 6, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

25. multistage hydraulic bridging plug seating and sealing units according to claim 7, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

26. multistage hydraulic bridging plug seating and sealing units according to claim 8, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

27. multistage hydraulic bridging plug seating and sealing units according to claim 9, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

28. multistage hydraulic bridging plug seating and sealing units according to claim 10, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

29. multistage hydraulic bridging plug seating and sealing units according to claim 11, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

30. multistage hydraulic bridging plug seating and sealing units according to claim 12, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

31. multistage hydraulic bridging plug seating and sealing units according to claim 13, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

32. multistage hydraulic bridging plug seating and sealing units according to claim 14, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

33. multistage hydraulic bridging plug seating and sealing units according to claim 15, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

34. multistage hydraulic bridging plug seating and sealing units according to claim 16, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

35. multistage hydraulic bridging plug seating and sealing units according to claim 17, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

36. multistage hydraulic bridging plug seating and sealing units according to claim 18, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

37. multistage hydraulic bridging plug seating and sealing units according to claim 19, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

38. multistage hydraulic bridging plug seating and sealing units according to claim 20, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.

39. multistage hydraulic bridging plug seating and sealing units according to claim 21, it is characterized in that motor and top connection are fixedly installed togather by bolt and screw rod, power transmission shaft and hydraulic pump are fixedly installed togather by bolt and screw rod, top connection and upper connecting cylinder are fixedly installed togather by screw thread, upper connecting cylinder and transition joint are fixedly installed togather by screw thread, transition joint and lower connecting cylinder are fixedly installed togather by screw thread, lower connecting cylinder and one way valve are fixedly installed togather by screw thread, the first cylindrical shell and the second cylindrical shell respectively with the first joint are fixedly installed togather by screw thread, the second cylindrical shell and the 3rd cylindrical shell respectively with the second joint are fixedly installed togather by screw thread, head rod and one way valve are fixedly installed togather by screw thread, between top connection and power transmission shaft, be installed with V-shaped seal ring, between transition joint and power transmission shaft, be installed with V-shaped seal ring, between top connection and upper connecting cylinder, be installed with O RunddichtringO at least together, between top connection and transition joint, be installed with O RunddichtringO at least together, between transition joint and lower connecting cylinder, be installed with O RunddichtringO at least together, between lower connecting cylinder and one way valve, be installed with O RunddichtringO at least together, between one way valve and the first cylindrical shell, be installed with O RunddichtringO at least together, O RunddichtringO together with being installed with respectively at least between the first cylindrical shell and the second cylindrical shell and the first joint, O RunddichtringO together with being installed with respectively at least between the second cylindrical shell and the 3rd cylindrical shell and the second joint, between the 3rd cylindrical shell and lower contact, be installed with O RunddichtringO at least together, between piston on head rod and the first cylindrical shell, be installed with O RunddichtringO at least together, between piston on the second connecting rod and the second cylindrical shell, be installed with O RunddichtringO at least together, between piston on the 3rd connecting rod and the 3rd cylindrical shell, be installed with O RunddichtringO at least together, between interior ring platform on the first cylindrical shell and head rod, be installed with O RunddichtringO at least together, between interior ring platform on the second cylindrical shell and the second connecting rod, be installed with O RunddichtringO at least together, between interior ring platform on the 3rd cylindrical shell and the 3rd connecting rod, be installed with O RunddichtringO at least together, between lower contact and plug, be installed with O RunddichtringO at least together.