CN112065307B - Hydraulic auxiliary piston booster-type well bottom reverse circulation fishing tool - Google Patents
Hydraulic auxiliary piston booster-type well bottom reverse circulation fishing tool Download PDFInfo
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- CN112065307B CN112065307B CN202011071282.6A CN202011071282A CN112065307B CN 112065307 B CN112065307 B CN 112065307B CN 202011071282 A CN202011071282 A CN 202011071282A CN 112065307 B CN112065307 B CN 112065307B
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- 230000002441 reversible effect Effects 0.000 title claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims abstract description 55
- 230000007246 mechanism Effects 0.000 claims abstract description 47
- 210000002445 nipple Anatomy 0.000 claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 238000003825 pressing Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 16
- 230000008093 supporting effect Effects 0.000 claims description 11
- 210000004907 gland Anatomy 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000012634 fragment Substances 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 20
- 239000003921 oil Substances 0.000 description 15
- 230000033001 locomotion Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/03—Freeing by flushing
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/18—Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot
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- Fluid Mechanics (AREA)
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- Geochemistry & Mineralogy (AREA)
- Marine Sciences & Fisheries (AREA)
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Abstract
The invention discloses a hydraulic auxiliary piston booster-type shaft bottom reverse circulation fishing tool, which comprises a hydraulic device, a booster nipple, a flow passage conversion nipple, a slider and a fisher, wherein the hydraulic device is arranged in a cavity at the upper part of the booster nipple; the pressurizing nipple comprises a pressurizing nipple body with a cylinder structure, and a worm and worm wheel rotating mechanism, a transmission mechanism and a piston mechanism which are sequentially arranged in an inner cavity of the pressurizing nipple body from top to bottom; the flow channel conversion short section comprises a short section body and a one-way valve; the slider consists of a slider short section and a ball randomly embedded on the outer wall of the slider short section; the fisher comprises a bearing body and a plurality of upward-openable opening pieces which are sealed at an opening at the top end of the bearing body through torsion springs; the tool can shorten the circulation flow, reduce energy loss, ensure that the fishing tool goes down to a preset position in a well with a larger well inclination angle, provide sufficient storage space for falling objects or fragments, and improve the construction efficiency.
Description
Technical Field
The invention relates to the technical field of underground operation of oil and gas wells, in particular to a hydraulic auxiliary piston booster-type well bottom reverse circulation fishing tool.
Background
When junk or debris fishing operation is carried out in an oil-gas well, the method mainly depends on the positive circulation or reverse circulation mode of the whole shaft to wash or salvage the junk at the bottom of the well to the ground. The whole shaft is in a positive circulation mode, namely, the bottom of an oil pipe column is provided with a pen point and is arranged at the bottom of the well, well repairing liquid is injected at high pressure and large discharge amount through the oil pipe by using a ground pump, and falling objects or scraps are washed at the well bottom and impact the well bottom, and then the falling objects or the scraps return to the ground through an annular space between the oil pipe and a sleeve. If the bottom hole junk is large, the junk is easy to be clamped between the oil pipe and the casing pipe in the return process, so that the drill clamping accident is caused. The whole shaft reverse circulation mode has two construction modes, one is that the bottom of the oil pipe column is provided with a pen point and is put down to the bottom of the shaft, and a ground pump is used for injecting workover fluid from the annular space between the oil pipe and the casing pipe to flush the falling objects out of the bottom of the shaft and return to the ground through the space in the oil pipe. In the mode, a rotary blowout preventer is required to be installed at the wellhead, and workover fluid is required to be injected with large discharge, so that the operation cost is greatly increased; one is to install fishing tools such as a fishing basket or a fishing cup on the tubing string, to be lowered to the well bottom, to inject workover fluid from the oil jacket annulus, to enter the fishing basket or the fishing cup when the falling objects or fragments rushing away from the well bottom return from the tubing, to be taken out with the tubing string and carried to the ground. The fishing basket or the fishing cup used in the method has no closure device after fishing, so that the fished falling objects or fragments fall into the bottom of the well again in the process of lifting the pipe column, and the fishing basket or the fishing cup has small volume and limited capacity of containing the falling objects, thereby limiting the popularization and the application of the fishing basket or the fishing cup.
The salvaging operation of oil-gas-water well mainly depends on the flushing energy of well bottom repairing liquid, and well bottom falling objects or fragments are flushed away from the well bottom and returned to the ground or in a salvaging tool. Particularly, when an oil-gas well (such as a highly-deviated well, a horizontal well and the like) with a large well inclination angle is subjected to fishing operation, the fishing fluid is seriously lost in the circulating process due to the influence of a well track, so that the hydraulic energy reaching the bottom of the well is insufficient, and the fishing operation cannot be realized. And the pumping pressure and the discharge capacity are increased on the ground, so that the cost investment of equipment, energy, the volume of workover fluid and the like can be increased, a ground pipeline can bear higher pressure, the risk of puncture and leakage is increased, and potential safety hazards exist.
Therefore, an economical and efficient fishing tool suitable for wells with larger well inclination angles such as highly deviated wells and horizontal wells needs to be designed, the success rate of fishing of the wells is guaranteed under the condition that cost investment is not increased, production or water injection of oil-gas wells is rapidly recovered, and high economic benefit is obtained.
Disclosure of Invention
The invention aims to provide a hydraulic auxiliary piston booster type bottom hole reverse circulation fishing tool for solving the technical problems and ensuring the success rate of well fishing without increasing the cost investment.
Therefore, the technical scheme of the invention is as follows:
a hydraulic auxiliary piston booster-type well bottom reverse circulation fishing tool comprises a hydraulic device, a booster nipple, a flow channel conversion nipple, a slider and a fisher; the hydraulic device is arranged at the upper part of the pressurizing short section, and the pressurizing short section, the flow channel conversion short section, the slider and the fisher are sequentially connected from top to bottom;
the hydraulic device comprises an upper hydraulic pipeline, a liquid separating valve, two lower hydraulic pipelines, two hydraulic motors and two connecting shafts; one end of the upper hydraulic pipeline is connected with a hydraulic station on the ground, and the other end of the upper hydraulic pipeline is simultaneously connected with one end of the two lower hydraulic pipelines through a liquid distributing valve arranged in the well; the bottom ends of the two lower hydraulic pipelines are respectively connected with the two hydraulic motors, and the bottom driving shafts of the two hydraulic motors are respectively connected with the top ends of the two connecting shafts;
the pressurizing nipple comprises a pressurizing nipple body with a cylinder structure, and a worm and worm wheel rotating mechanism, a transmission mechanism and a piston mechanism which are sequentially arranged in an inner cavity of the pressurizing nipple body from top to bottom; the worm and worm wheel rotating mechanism comprises two worms, a worm wheel body, a rotating shaft and a gland; the two worms are symmetrically arranged, the top ends of the two worms are respectively connected with the bottom ends of the two connecting shafts through a coupler, and the bottom ends of the two worms are respectively and rotatably supported on the end surface of an annular step arranged on the inner wall of the supercharging nipple body through two ball bearings; the worm wheel body consists of a worm wheel and a wheel disc which are concentrically welded into a whole; the worm wheel is vertically arranged between the two worms and meshed with the two worms; the wheel disc is of a thick circular disc structure, and two square slideways which penetrate through the side wall of the wheel disc and are in a cross shape are milled on the opposite side surface welded with the worm wheel along the vertical direction and the transverse direction; one end of the rotating shaft is fixed in a central through hole of the worm wheel, and the other end of the rotating shaft is rotatably inserted in a through hole formed in the side wall of the pressurizing nipple body through a rolling bearing and sealed at the through hole through a gland in a sealing manner;
the transmission mechanism comprises two sliding blocks, a transmission sheet and a transmission head; the two sliding blocks are initially positioned at the adjacent end sides of the two sliding ways respectively; the front end of the transmission piece is rotatably arranged on the two sliding blocks through two bolts; the transmission head is fixed at the rear end of the transmission sheet, and the bottom end of the transmission head is processed into a spherical part;
the piston mechanism comprises a piston body, two split pressing sheets and a plurality of spring valves; the piston body is arranged in a small inner diameter cavity at the lower part of the supercharging nipple body, a hemispherical pit for arranging a spherical part of the transmission head is formed in the center of the top surface of the piston body, and a plurality of two-stage stepped through holes for arranging spring valves one by one are formed in the top surface of the piston body and positioned in the circumferential direction of the hemispherical pit; the split pressing sheets are semi-circular arc-shaped thick sheets, the upper parts of the inner side surfaces of the split pressing sheets are processed into conical surfaces, the lower parts of the inner side surfaces of the split pressing sheets are processed into semi-circular spherical surfaces matched with the spherical parts of the transmission heads, so that the two sides of the spherical parts of the transmission heads, which are symmetrically arranged at the lower sides of the two split pressing sheets and are positioned in the semi-spherical pits of the piston body, are fixed on the top surface of the piston body in an involutory manner, and the spherical parts of the transmission heads can be kept to move freely; the spring valve comprises a valve body, a tension spring and a conical block; the outer wall of the top end of the valve body is provided with an annular boss of which the outer diameter is slightly smaller than the inner diameter of the upper part of the two-stage stepped through hole, and the bottom end of the valve body is processed into a conical part of which the outer diameter is between the maximum inner diameter and the minimum inner diameter of two annular steps of the two-stage stepped through hole, so that the bottom end of the valve body is just clamped between the two annular steps; the conical block is in a conical frustum shape and is arranged on the upper end surface of the annular step at the lower side of the two-stage stepped through hole; a screw is screwed on the top surface of the conical block, and a vertically arranged iron ring is welded at the top end of the screw; the top surface of the valve body is horizontally welded with a thin iron rod sleeved with an iron ring, the tension spring is in a stretching state, and two ends of the tension spring are respectively hung on the iron ring at the top end of the screw and the iron ring sleeved on the thin iron rod.
Further, the flow channel conversion short section comprises a short section body and a one-way valve; wherein the content of the first and second substances,
the short joint body is of a cylindrical structure, and a first blind hole and a second blind hole are respectively formed in the top surface and the bottom surface of the short joint body along the axial direction; a plurality of spraying flow channels are axially formed in the side wall of the short joint body, the top end of each spraying flow channel is communicated with the bottom of the first blind hole through a radial hole, and the bottom end of each spraying flow channel is communicated with the outside of the short joint body through an inclined hole which is inclined downwards from inside to outside; a backflow flow channel which is obliquely and upwards arranged from inside to outside is also arranged between every two ejection flow channels, each backflow flow channel is communicated with the bottom of the second blind hole and the outside of the short section body, and the outlet of the backflow flow channel is higher than the outlet of the ejection flow channel;
the one-way valve is composed of a conical body and a pressure spring; the conical body is of a cylinder structure with a closed top and an opening at the bottom; the pressure spring is in a compressed state and is vertically arranged in the conical body, the top end of the pressure spring is abutted against the top surface of the conical body, and the bottom end of the pressure spring is press-fitted at the bottom of the first blind hole; the outer diameter of the conical body is between the inner diameter of the annular boss on the supercharging nipple body and the inner diameter of the first blind hole, so that the conical body is arranged in the first blind hole in a gap mode, and the top end of the conical body is clamped at the top corner of the lower end of the annular boss.
Furthermore, the slider consists of a slider short section and a ball randomly embedded on the outer wall of the slider short section; the slider short section is of a cylindrical barrel structure, and a ball embedded on the slider short section can freely rotate around 360 degrees.
Further, the fisher comprises a supporting body, a plurality of opening sheets and a plurality of torsion springs; the supporting body is of a cylindrical barrel structure, and the plurality of opening pieces are arranged on the supporting body in a mode that a vertex angle faces the circumferential direction of the inner circle by taking the central axis of the supporting body as the center; the plurality of the opening pieces are respectively and movably fixed on the end surface of the top end of the bearing body through a plurality of torsion springs with the same number as the opening pieces and matched bolts; each torsion spring is in a pre-twisting state, so that the plurality of opening pieces are close to each other inwards and close the top end opening of the bearing body; each opening sheet is provided with a plurality of water filtering holes.
Furthermore, the width of the opening end sides of the two slide ways is slightly smaller than that of the slide ways, so that a limiting part is formed, and the radial section of each slide way is C-shaped.
Furthermore, an included angle formed by the axial direction of the inclined hole of the ejection flow channel and the axial direction of the short joint body is 60 degrees; the included angle formed by the axial direction of the return flow channel and the axial direction of the short joint body is 60 degrees.
Furthermore, each opening sheet is an isosceles triangle sheet with the vertex angle of 40 degrees; the aperture of the water filtering hole is 10 mm; the torsion spring is a torsion spring.
Further, the bottom end of the fisher is connected with a milling tool through a lower joint in threaded connection.
Compared with the prior art, the hydraulic auxiliary piston booster-type shaft bottom reverse circulation fishing tool is suitable for fishing operation of oil-gas wells with large well inclination angles, and the hydraulic device is used for providing rotary power for the worm and worm gear rotating mechanism, so that the piston mechanism is driven by the transmission mechanism to generate vertical reciprocating linear motion, and shaft bottom boosting of fluid is realized by matching with opening and closing of the spring valve and the one-way valve. The conversion of the positive circulation flow channel and the negative circulation flow channel at the bottom of the well is realized through the ejection flow channel and the return flow channel, the circulation flow is shortened, and the energy loss is reduced. The static friction is converted into dynamic friction through the slider, so that the frictional resistance is reduced, the fishing tool is ensured to be lowered to a preset position in a well with a larger well angle, and sufficient storage space for falling objects or debris is provided. The opening and closing of the opening piece in the fisher under the action of the liquid flow and the torsion spring ensures that salvaged falling objects do not return to the bottom of the well, thereby greatly improving the salvage operation success rate of the oil-gas well with a larger well inclination angle, shortening the construction period and quickly realizing the production economic benefit of the oil-gas well.
Drawings
FIG. 1 is a schematic structural view of a hydraulically assisted piston booster-type downhole reverse circulation fishing tool of the present invention with the piston structure at the uppermost extreme position;
FIG. 2 is a schematic structural diagram of a hydraulic device, a pressurizing short section and a flow channel conversion short section of the hydraulic auxiliary piston pressurizing type downhole reverse circulation fishing tool in the state that a piston structure is at the lowest extreme position;
FIG. 3 is a schematic diagram of the configuration of the slider, overshot, and lower sub of the hydraulically assisted piston booster down hole reverse circulation fishing tool of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 1 at A;
FIG. 5 is an enlarged view of a portion of FIG. 2 at B;
FIG. 6 is a full sectional view taken at C-C of FIG. 2;
FIG. 7 is a schematic side view of the internal structure of the booster sub of the hydraulically assisted piston booster-type downhole reverse circulation fishing tool of the present invention with the piston structure at the uppermost extreme position;
FIG. 8 is another side schematic structural view of the internal structure of the booster nipple of the hydraulically assisted piston booster-type downhole reverse circulation fishing tool of the present invention with the piston structure at the uppermost extreme position; (ii) a
FIG. 9 is a schematic structural view of one side of an internal structure of a pressurizing pup joint of the hydraulic auxiliary piston pressurizing type downhole reverse circulation fishing tool in the state that a piston structure is at any position;
FIG. 10 is a schematic structural view of the other side of the internal structure of a pressurizing pup joint of the hydraulic auxiliary piston pressurizing type downhole reverse circulation fishing tool in the state that the piston structure is at any position;
FIG. 11 is a schematic view of the worm gear body of the hydraulically assisted piston booster bottom hole reverse circulation fishing tool of the present invention;
FIG. 12 is a schematic structural view of the slide of the hydraulically assisted piston boosted downhole reverse circulation fishing tool of the present invention;
FIG. 13 is a schematic structural view of the drive strap and drive head of the hydraulically assisted piston boosted downhole reverse circulation fishing tool of the present invention;
FIG. 14 is a schematic structural view of a split blade of the hydraulically assisted piston boosted downhole reverse circulation fishing tool of the present invention;
FIG. 15 is a schematic structural view of a piston body of the hydraulically assisted piston booster downhole reverse circulation fishing tool of the present invention;
FIG. 16 is a schematic diagram of the construction of the spring valve of the hydraulically assisted piston booster downhole reverse circulation fishing tool of the present invention;
FIG. 17 is a schematic structural view of the conical block in the spring valve of the hydraulically assisted piston boosted downhole reverse circulation fishing tool of the present invention in an open state;
FIG. 18 is a schematic structural view of a short joint body of a flow channel conversion sub of the hydraulically-assisted piston booster-type downhole reverse circulation fishing tool of the present invention;
FIG. 19 is a schematic structural view of the slider of the hydraulically assisted piston boosted downhole reverse circulation fishing tool of the present invention;
FIG. 20 is a side schematic view of the overshot of the hydraulically assisted piston booster bottom hole reverse circulation fishing tool of the present invention;
FIG. 21 is another side schematic view of the overshot of the hydraulically assisted piston booster bottom hole reverse circulation fishing tool of the present invention;
FIG. 22 is a schematic diagram of the structure of the flared blade of the hydraulically assisted piston boosted downhole reverse circulation fishing tool of the present invention.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
As shown in fig. 1, the hydraulic auxiliary piston booster type downhole reverse circulation fishing tool comprises a hydraulic device 1, a booster pup joint 2, a flow channel conversion pup joint 3, a slider 4, a fisher 5 and a lower connector 6; wherein, hydraulic means 1 installs in pressure boost nipple joint 2 upper portions, and pressure boost nipple joint 2, runner conversion nipple joint 3, slider 4, fisher 5 and lower clutch 6 top-down connect gradually and constitute fishing tool to be connected to into the well tubular column through pressure boost nipple joint 2 on, fishing tool bottom connects milling tool through lower clutch 6.
As shown in fig. 1 and 2, the hydraulic device 1 comprises an upper hydraulic pipeline 1-1, a liquid separating valve 1-2, two lower hydraulic pipelines 1-3, two hydraulic motors 1-4 and two connecting shafts 1-5; one end of an upper hydraulic pipeline 1-1 is connected with a ground hydraulic station, and the other end of the upper hydraulic pipeline is simultaneously connected with one end of two lower hydraulic pipelines 1-3 through a liquid distributing valve 1-2 arranged in a well, so that hydraulic oil of the hydraulic station is averagely distributed to the two lower hydraulic pipelines 1-3 after being conveyed to the liquid distributing valve 1-2; the bottom ends of the two lower hydraulic pipelines 1-3 are respectively connected with the two hydraulic motors 1-4 so as to drive the hydraulic motors 1-4 to rotate by pumping hydraulic oil, and the bottom end driving shafts of the two hydraulic motors 1-4 are respectively connected with the top ends of the two connecting shafts 1-5 so as to drive the two synchronous connecting shafts 1-5 to rotate; under the working state, the two hydraulic motors 1-4 drive the two connecting shafts 1-5 to rotate in opposite directions, so that the rotating motion in opposite directions is output.
As shown in fig. 2, the booster nipple 2 comprises a booster nipple body 2-1, a worm and worm gear rotating mechanism 2-2, a transmission mechanism 2-3 and a piston mechanism 2-4; wherein the content of the first and second substances,
as shown in fig. 6, the pressurizing nipple body 2-1 is a cylindrical barrel structure, an annular boss is formed on the inner wall of the lower portion of the pressurizing nipple body in a protruding manner, two stages of annular steps are formed on the inner wall of the top end of the annular boss in a gradually recessed manner, and the upper end face of the annular step on the upper side is processed into an inclined plane; the worm and worm wheel rotating mechanism 2-2 and the transmission mechanism 2-3 are arranged in a large-inner-diameter cavity at the upper part of the pressurizing nipple body 2-1 from top to bottom; the piston mechanism 2-4 is arranged in a small inner diameter cavity at the lower part of the pressurizing nipple body 2-1; in particular, the amount of the solvent to be used,
as shown in fig. 7 and 8, the worm and worm wheel rotating mechanism 2-2 comprises two worms 2-2-1, a worm wheel body 2-2-2, a rotating shaft 2-2-3 and a gland 2-2-4; the two worms 2-2-1 are symmetrically arranged, the top ends of the two worms are respectively connected with the bottom ends of the two connecting shafts 1-5 through couplings, and the bottom ends of the two worms are respectively rotatably supported on the upper end surface of the lower side annular step of the double-section annular step of the pressurizing pup joint body 2-1 through two ball bearings, so that the two worms 2-2-1 respectively rotate along the two connecting shafts 1-5 in opposite directions in the horizontal direction;
as shown in FIG. 11, the worm wheel body 2-2-2 is composed of a worm wheel 2-2-2-1 and a wheel disc 2-2-2-2, and the two are concentrically welded into a whole; the worm wheel 2-2-2-1 is vertically arranged between the two worms 2-2-1 and is meshed with the two worms 2-2-1, so that the worm wheel 2-2-2-1 drives the wheel disc 2-2-2-2 to synchronously rotate along one direction in the vertical direction under the action of strong rotating torque provided by the two worms 2-2-1; the wheel disc 2-2-2-2 is of a thick circular disc structure, and two square slideways 2-2-2-1 which penetrate through the side wall of the wheel disc and are in a cross shape are milled on the opposite side surface welded with the worm wheel 2-2-2-1 along the vertical direction and the transverse direction; the width of the opening end sides of the two slideways 2-2-2-1 is slightly smaller than that of the slideways to form a limiting part, so that the radial section of each slideway 2-2-2-2-1 is in a C shape;
one end of the rotating shaft 2-2-3 is fixed in a central through hole of the worm wheel 2-2-2-1, and the other end of the rotating shaft is rotatably inserted in a through hole formed in the side wall of the pressurizing nipple body 2-1 through a rolling bearing to generate a rotating supporting effect on the worm wheel body 2-2-2; the gland 2-2-4 is covered on the through hole and is fixed on the outer wall of the pressurizing nipple body 2-1 through a fastening pin; meanwhile, a sealing ring is arranged on the contact wall surface between the gland 2-2-4 and the pressurizing pup joint body 2-1 so as to realize the sealing between the gland 2-2-4 and the body 2-1;
as shown in fig. 9 and 10, the transmission mechanism 2-3 includes two sliders 2-3-1, a transmission strap 2-3-2 and a transmission head 2-3-3; wherein the content of the first and second substances,
as shown in fig. 12, the two sliders 2-3-1 are cubic sliders, the widths of which are consistent with the widths of the slide ways 2-2-2-1, and the two sliders are respectively placed in the two slide ways 2-2-2-1 and are respectively located at the adjacent end sides of the two slide ways 2-2-2-1 in an initial state, that is, the two sliders 2-3-1 are respectively inserted into the two slide ways 2-2-2-2-1 in a manner that the lengths and the widths of the two sliders are mutually perpendicular, wherein one slider 2-3-1 is vertically inserted, and the other slider 2-3-1 is horizontally inserted and is blocked by the protruding outer edge of the slide way 2-2-2-1; each sliding block is provided with a screw hole along the radial direction;
as shown in fig. 13, the transmission strap 2-3-2 is a strip-shaped thin sheet, which is vertically arranged, the front end of which is provided with two circular holes at intervals, and the bottom end of which is welded with a transmission head 2-3-3; the front ends of the transmission pieces 2-3-2 are respectively aligned with the threaded holes on the two sliding blocks 2-3-1 through the axes of the two round holes on the transmission pieces and are provided with bolts, so that the front ends of the transmission pieces 2-3-2 are rotatably arranged on the two sliding blocks 2-3-1, and the connection between the worm and worm wheel rotating mechanism 2-2 and the transmission mechanism 2-3 is further completed; the bottom end of the transmission head 2-3-3 is processed with a spherical part;
the piston mechanism 2-4 comprises a piston body 2-4-1, two split pressing sheets 2-4-2 and five spring valves 2-4-3; wherein the content of the first and second substances,
the piston body 2-4-1 is of a cylindrical structure, a hemispherical pit is formed in the center of the top surface of the piston body, and the size of the hemispherical pit is matched with that of the spherical part of the transmission head 2-3-3, so that the ball head of the transmission head 2-3-3 can be arranged in the hemispherical pit; five double-step-shaped through holes distributed along the circumferential direction are axially formed in the top surface of the piston body 2-4-1, and the inner diameter of each double-step-shaped through hole is gradually reduced from top to bottom to form two annular steps; six threaded holes distributed along the circumferential direction are formed between the hemispherical pit and the five stepped through holes along the axial direction;
as shown in fig. 14, each of the split pressing pieces 2-4-2 is a semi-circular arc-shaped thick piece, and three uniformly distributed through holes are axially formed in the thick piece; the upper part of the inner side surface of the split pressing sheet 2-4-2 is processed into a conical surface, the lower part is processed into a semicircular spherical surface matched with the spherical part of the transmission head 2-3-3, so that the two sides of the spherical part of the transmission head 2-3-3, which are symmetrically arranged at the lower sides of the two split pressing sheets 2-4-2 and are positioned in the hemispherical pit of the piston body 2-4-1, are oppositely arranged on the top surface of the piston body 2-4-1; wherein, six through holes of two split pressing sheets 2-4-2 fixed on the top surface of the piston body 2-4-1 in an involutory way are respectively in one-to-one correspondence with six screw holes on the piston body 2-4-1, so as to surround the transmission head 2
The two split pressing pieces 2-4-2 of the spherical part 3-3 are fixed on the piston body 2-4-1 through bolts;
as shown in fig. 15, five spring valves 2-4-3 are respectively arranged in the five stepped through holes; in particular, the amount of the solvent to be used,
as shown in fig. 4 and 16, each spring valve 2-4-3 includes a valve body 2-4-3-1, a tension spring 2-4-3-2, and a conical block 2-4-3-3; wherein, the outer wall of the top end of the valve body 2-4-3-1 is provided with an annular boss of which the outer diameter is slightly smaller than the inner diameter of the upper part of the double-stage stepped through hole, and the bottom end of the valve body is processed into a conical part of which the outer diameter is between the maximum inner diameter and the minimum inner diameter of two annular steps of the double-stage stepped through hole, so that the bottom end of the valve body 2-4-3-1 is just clamped between the two annular steps;
as shown in fig. 17, the tapered block 2-4-3-3 is in a truncated cone shape, and the size of the tapered block is adapted to the size of the lower annular step of the two-step-shaped through hole, so that the tapered block is arranged on the upper end surface of the lower annular step of the two-step-shaped through hole; a screw is screwed on the top surface of the conical block 2-4-3-3, and a vertically arranged iron ring is welded at the top end of the screw; a thin iron rod sleeved with an iron ring is horizontally welded on the top surface of the valve body 2-4-3-1, the tension spring 2-4-3-2 is in a stretching state, and two ends of the tension spring are respectively hung on the iron ring at the top end of the screw and the iron ring sleeved on the thin iron rod. When the piston mechanism 2-4 is installed, firstly, the transmission head 2-3-3 is placed into a concave pit of the piston body 2-4-1, two split pressing sheets 2-4-2 are symmetrically clamped at two ends and fastened on the piston body 2-4-1 through hexagon socket head cap screws to form a hinge joint between the transmission head 2-3-3 and the piston body 2-4-1; the upper part of the middle of the split pressing sheet 2-4-2 is a conical surface, so that the transmission head 2-3-3 can swing on any plane of the inner space in a reciprocating manner; and then inserting the assembled spring valve 2-4-3 into the stepped through hole of the piston body 2-4-1 from the end of the conical block 2-4-3-3 inwards to complete the installation of the piston mechanism 2-4 and the connection of the transmission mechanism 2-3 and the piston mechanism 2-4.
As shown in fig. 3, 5 and 6, the flow channel conversion short section 3 comprises a short section body 3-1, a one-way valve 3-2, an ejection flow channel 3-3 and a backflow flow channel 3-4; wherein the content of the first and second substances,
as shown in fig. 5 and 18, the short joint body 3-1 is a cylindrical structure, and a first blind hole and a second blind hole are respectively formed in the top surface and the bottom surface of the short joint body along the axial direction; eight ejection flow channels 3-3 are axially arranged in the side wall of the short joint body 3-1, the top end of each ejection flow channel 3-3 is communicated with the bottom of the first blind hole through a radial hole, and the bottom end of each ejection flow channel is communicated with the outside of the short joint body 3-1 through an inclined hole which is inclined downwards from inside to outside; a backflow flow channel 3-4 which is obliquely and upwards opened from inside to outside is also arranged between every two ejection flow channels 3-3, and each backflow flow channel 3-4 is communicated with the bottom of the second blind hole and the outside of the short joint body 3-1; the included angle formed by the axial direction of the inclined hole of the ejection flow channel 3-3 and the axial direction of the short joint body 3-1 is 60 degrees, the included angle is used for ejecting workover fluid into the oil sleeve annulus from an oil pipe, the included angle formed by the axial direction of the return flow channel 3-4 and the axial direction of the short joint body 3-1 is 60 degrees, the included angle is used for ejecting workover fluid which is returned from the well bottom into the oil sleeve annulus from the oil pipe upwards, and a reverse circulation passage of the well bottom is formed; eight ejection flow channels 3-3 and eight backflow flow channels 3-4 are arranged on the short section body 3-1 in a staggered mode, and the outlet of the backflow flow channel 3-4 is higher than the outlet of the ejection flow channel 3-3;
the one-way valve 3-2 is composed of a conical body 3-2-1 and a pressure spring 3-2-2; wherein, the conical body 3-2-1 is a cylinder structure with a closed top and an opening at the bottom; the pressure spring 3-2-2 is in a compressed state and is vertically arranged in the conical body 3-2-1, the top end of the pressure spring is propped against the top surface of the conical body 3-2-1, and the bottom end of the pressure spring is pressed at the bottom of the first blind hole; the outer diameter of the conical body 3-2-1 is between the inner diameter of the annular boss on the pressurizing nipple body 2-1 and the inner diameter of the first blind hole, so that the conical body is arranged in the first blind hole in a gap-existing mode, and the top end of the conical body is clamped at the vertex angle of the lower end of the annular boss to block the flowing of the well repairing liquid in the piston cylinder section;
when the pressurizing short section 2 and the flow channel conversion short section 3 are connected, firstly, a pressure spring 3-2-2 of a single-flow valve 3-2 is inwards inserted into an upper space inside the flow channel conversion short section 3, at the moment, the pressure spring is in a free state, and an upper conical surface of a conical body 3-2-1 is far higher than the upper surface of the flow channel conversion short section 3; then when the pressurizing short section 2 and the flow channel conversion short section 3 are connected through screw threads, the conical body 3-2-1 props against the lower surface of the piston cylinder section and starts to compress the pressure spring 3-2-2, so that the pressure spring 3-2-2 is in a pre-compression state;
as shown in fig. 19, the slider 4 is composed of a slider short section and a ball 4-1 randomly embedded on the outer wall of the slider short section; the sliding device is characterized in that the sliding device short section is of a cylindrical barrel structure, and a ball 4-1 embedded on the sliding device short section can freely rotate around 360 degrees, so that static friction is converted into dynamic friction, and the fishing tool is guaranteed to smoothly descend to a preset position.
As shown in FIGS. 20 and 21, the overshot 5 comprises a carrier 5-1, nine spreading tabs 5-2 and nine torsion springs 5-3; the supporting body 5-1 is of a cylindrical barrel structure, and the nine opening pieces 5-2 are arranged on the supporting body 5-1 in a manner that the central axis of the supporting body 5-1 is taken as the center and the vertex angle faces the circumferential direction of the inner circle; the nine opening sheets 5-2 are respectively and movably fixed on the end surface of the top end of the bearing body 5-1 through nine torsion springs 5-3 and matched bolts; the nine torsion springs are in a pre-twisting state, so that the 9 opening pieces 5-2 are close to each other inwards due to the torsion load; wherein, each opening sheet 5-2 is an isosceles triangle sheet with a vertex angle of 40 degrees, and the sheet is provided with a water filtering hole with the aperture of 10 mm; the torsion spring 5-3 is a torsion spring; after the slider 4 is connected with the fisher 5, the opening sheet 5-2 extends into the slider 4 to form a closed storage space, namely, the salvaged fallen objects or fragments are stored in the slider 4, so that the length of the slider 4 can be determined according to the volume of the fallen objects or fragments at the bottom of a well, and the requirement of one-time pipe string for fishing the fallen objects is met.
The working principle of the hydraulic auxiliary piston booster-type well bottom reverse circulation fishing tool is as follows:
when the hydraulic power station works, a ground hydraulic station is started, pressurized hydraulic oil is supplied to a liquid distribution valve 1-2 through an upper hydraulic pipeline 1-1, the liquid distribution valve 1-2 evenly distributes the hydraulic oil to two hydraulic motors 1-4 through two sets of lower hydraulic pipelines 1-3, the two hydraulic motors 1-4 are arranged to output opposite rotary motions, and then two worms 2-2-1 are driven to generate opposite rotary motions through a transmission shaft 1-5;
the two worms 2-2-1 are symmetrically meshed with the worm wheel 2-2-2-1 left and right, the horizontal rotation motion of the worms 2-2-1 is converted into vertical rotation motion, and the wheel disc 2-2-2 rotates coaxially. The two sliding blocks 2-3-1 are vertically and alternately arranged in the cross slide way 2-2-2-1 of the wheel disc 2-2-2 in a length and width mode, the same transmission piece 2-3-2 and the same transmission head 2-3-3 are hinged through bolts, and therefore the two sliding blocks are connected with the piston mechanism 2-4, and the piston mechanism 2-4 is limited by the piston cylinder section and can only move up and down. In the process of rotating the wheel disc 2-2-2-2, the two sliding blocks 2-3-1 are constrained by the driving sheets 2-3-2 to generate rotating torque force to force the sliding blocks to do linear and periodic reciprocating motion along the slide ways in the respective slide ways 2-2-2-1 along with the rotation of the wheel disc 2-2-2-2. Under the constraint of the piston mechanism 2-4, the reciprocating motion of the two sliding blocks 2-3-1 drives the transmission piece 2-3-2 and the transmission head 2-3-3 to do reciprocating swing on the left and right and reciprocating linear motion up and down on a vertical plane in the inner cavity of the body 2-1 of the pressurizing pup joint 2, so that the piston mechanism 2-4 is driven to do reciprocating linear motion up and down, namely, the horizontal rotating motion of the worm wheel 2-2-1 is finally converted into the reciprocating linear motion of the piston mechanism 2-4 through the worm and gear rotating mechanism 2-2 and the transmission mechanism 2-3. The bell mouth at the upper part of the middle of the split pressing sheet 2-4-2 on the piston mechanism 2-4 provides a moving space for the left-right reciprocating swing of the transmission head 2-3-3. When the piston mechanism 2-4 moves upwards from the lowest end of the piston cylinder section, the conical body 3-2-1 of the check valve 3-2 clings to and blocks the lower part of the piston cylinder section under the action of the pressure spring 3-2-2, the conical block 2-4-3-3 at the lower part of the spring valve 2-4-3 moves downwards under the impact action of relative downward water flow to be opened, so that liquid is filled into the piston cylinder section, when the piston mechanism 2-4 moves upwards to the extreme position of the highest end, the movement is stopped, the spring valve 2-4-3-3 pulls back the conical block 2-4-3-3 under the tension action of the tension spring 2-4-3-2, the conical block is tightly attached to the lower part of the valve body 2-4-3-1, and the liquid filling is stopped;
the piston mechanism 2-4 moves downwards under the pushing of the transmission mechanism 2-3, at the moment, the spring valve 2-4-3 and the one-way valve 3-2 are both in a closed state, a closed space is formed in the piston cylinder section, and the piston mechanism 2-4 moving downwards compresses fluid in the piston cylinder section to pressurize the piston cylinder section. When the piston mechanism 2-4 descends to the lowest extreme position, the pressure increased by the internal fluid is enough to overcome the upward elastic force of the pressure spring 3-2-2 of the check valve 3-2, so that the pressure spring 3-2-2 is compressed, the conical body 3-2-1 is separated from the piston cylinder section, and a fluid channel is formed to discharge the pressurized workover fluid. The pressurized workover fluid enters a spraying flow channel 3-3 in the upper space of the flow channel conversion short section 3, is sprayed into an oil jacket annular space from an outlet, flows downwards to the bottom of the well, impacts falling objects or fragments, and returns upwards to the fisher 5;
under the impact of the fluid, the opening sheet 5-2 of the fisher 5 overcomes the torsion force of the torsion spring 5-3 to open to form a channel. The workover fluid carrying junk or debris returns upwards through the opening sheet 5-2, then the workover fluid continues to return upwards through the slider 4 to enter the lower space of the flow channel conversion short section 3, and is upwards sprayed into the annular space of the oil jacket from the outlet of the return flow channel 3-4 until the workover fluid returns to the ground. While the falling objects or debris stay in the inner space of the slider 4. When the circulation of the workover fluid is stopped, the opening pieces 5-2 are restored to a state of being combined with each other by the torsion force of the torsion springs 5-3, and at this time, due to the suspension effect without the flow of the workover fluid, falling objects or debris fall to the upper portions of the opening pieces 5-2 and are stored in the inner space formed by the opening pieces 5-2 and the slider 4. After the fishing is finished, the pipe column is lifted, the fluid in the pipe column flows out through the filtering liquid hole, and the falling objects or the fragments are stored and are brought to the ground along with the pipe column, so that the whole fishing operation is finished.
In summary, the present invention is not limited to the above-mentioned embodiments, and persons skilled in the art can easily set forth other embodiments according to the technical teaching of the present invention, but such embodiments are included in the scope of the present invention.
Claims (7)
1. A hydraulic auxiliary piston booster-type shaft bottom reverse circulation fishing tool is characterized by comprising a hydraulic device (1), a booster nipple (2), a flow channel conversion nipple (3), a slider (4) and a fisher (5); the hydraulic device (1) is arranged at the upper part of the pressurizing short section (2), and the pressurizing short section (2), the flow channel conversion short section (3), the slider (4) and the fisher (5) are sequentially connected from top to bottom;
the hydraulic device (1) comprises an upper hydraulic pipeline (1-1), a liquid separating valve (1-2), two lower hydraulic pipelines (1-3), two hydraulic motors (1-4) and two connecting shafts (1-5); one end of an upper hydraulic pipeline (1-1) is connected with a ground hydraulic station, and the other end of the upper hydraulic pipeline is simultaneously connected with one end of two lower hydraulic pipelines (1-3) through a liquid distributing valve (1-2) arranged in a well; the bottom ends of the two lower hydraulic pipelines (1-3) are respectively connected with the two hydraulic motors (1-4), and the bottom end driving shafts of the two hydraulic motors (1-4) are respectively connected with the top ends of the two connecting shafts (1-5);
the pressurizing short section (2) comprises a pressurizing short section body (2-1) with a cylinder structure, and a worm and worm wheel rotating mechanism (2-2), a transmission mechanism (2-3) and a piston mechanism (2-4) which are sequentially arranged in an inner cavity of the pressurizing short section body (2-1) from top to bottom; the worm and worm wheel rotating mechanism (2-2) comprises two worms (2-2-1), a worm wheel body (2-2-2), a rotating shaft (2-2-3) and a gland (2-2-4); the two worms (2-2-1) are symmetrically arranged, the top ends of the worms are respectively connected with the bottom ends of the two connecting shafts (1-5) through couplings, and the bottom ends of the worms are respectively rotatably supported on the annular step end surface arranged on the inner wall of the booster nipple body (2-1) through two ball bearings; the worm wheel body (2-2-2) is composed of a worm wheel (2-2-2-1) and a wheel disc (2-2-2-2), and the worm wheel body and the wheel disc are concentrically welded into a whole; the worm wheel (2-2-2-1) is vertically arranged between the two worms (2-2-1) and is meshed with the two worms (2-2-1); the wheel disc (2-2-2-2) is of a thick circular disc structure, and two square slideways (2-2-2-2-1) which penetrate through the side wall of the wheel disc and are in a cross shape are milled on the opposite side surface welded with the worm wheel (2-2-2-1) along the vertical direction and the horizontal direction; one end of the rotating shaft (2-2-3) is fixed in a central through hole of the worm wheel (2-2-2-1), and the other end of the rotating shaft is rotatably inserted in a through hole formed in the side wall of the pressurizing nipple body (2-1) through a rolling bearing and sealed at the through hole through a gland (2-2-4);
the transmission mechanism (2-3) comprises two sliding blocks (2-3-1), a transmission sheet (2-3-2) and a transmission head (2-3-3); the two sliding blocks (2-3-1) are initially respectively positioned at the adjacent end sides of the two slide ways (2-2-2-2-1); the front end of the transmission piece (2-3-2) is rotatably arranged on the two sliding blocks (2-3-1) through two bolts; the transmission head (2-3-3) is fixed at the rear end of the transmission sheet (2-3-2), and the bottom end of the transmission head is processed into a spherical part;
the piston mechanism (2-4) comprises a piston body (2-4-1), two split pressing sheets (2-4-2) and a plurality of spring valves (2-4-3); the piston body (2-4-1) is arranged in a small inner diameter cavity at the lower part of the pressurizing pup joint body (2-1), a hemispherical pit for arranging the spherical part of the transmission head (2-3-3) is formed in the center of the top surface of the piston body, and a plurality of two-stage step-shaped through holes for arranging the spring valves (2-4-3) one by one are formed in the top surface of the piston body (2-4-1) and positioned in the circumferential direction of the hemispherical pit; the split pressing sheets (2-4-2) are semi-circular arc-shaped thick sheets, the upper parts of the inner side surfaces of the split pressing sheets are processed into conical surfaces, the lower parts of the inner side surfaces of the split pressing sheets are processed into semi-circular spherical surfaces matched with the spherical parts of the transmission heads (2-3-3), so that the two sides of the spherical parts of the transmission heads (2-3-3) which are symmetrically arranged at the lower sides of the two split pressing sheets (2-4-2) and are positioned in the semi-spherical pits of the piston body (2-4-1) are fixed on the top surface of the piston body (2-4-1) in an involutory manner, and the spherical parts of the transmission heads (2-3-3) can be kept to move freely; the spring valve (2-4-3) comprises a valve body (2-4-3-1), a tension spring (2-4-3-2) and a conical block (2-4-3-3); an annular boss with the outer diameter slightly smaller than the inner diameter of the upper part of the double-stage stepped through hole is arranged on the outer wall of the top end of the valve body (2-4-3-1), and the bottom end of the valve body is processed into a conical part with the outer diameter between the maximum inner diameter and the minimum inner diameter of two annular steps of the double-stage stepped through hole, so that the bottom end of the valve body (2-4-3-1) is just clamped between the two annular steps; the conical block (2-4-3-3) is in a cone frustum shape and is arranged on the upper end face of the annular step at the lower side of the two-stage stepped through hole; a screw is screwed on the top surface of the conical block (2-4-3-3), and a vertically arranged iron ring is welded at the top end of the screw; a thin iron rod sleeved with an iron ring is horizontally welded on the top surface of the valve body (2-4-3-1), the tension spring (2-4-3-2) is in a stretching state, and two ends of the tension spring are respectively hung on the iron ring at the top end of the screw and the iron ring sleeved on the thin iron rod;
the flow channel conversion short joint (3) comprises a short joint body (3-1) and a one-way valve (3-2); wherein the content of the first and second substances,
the short joint body (3-1) is of a cylindrical structure, and a first blind hole and a second blind hole are respectively formed in the top surface and the bottom surface of the short joint body along the axial direction; a plurality of ejection flow channels (3-3) are axially arranged in the side wall of the short joint body (3-1), the top end of each ejection flow channel (3-3) is communicated with the bottom of the first blind hole through a radial hole, and the bottom end of each ejection flow channel is communicated with the outside of the short joint body (3-1) through an inclined hole which is inclined downwards from inside to outside; a backflow flow channel (3-4) which is obliquely and upwards arranged from inside to outside is also arranged between every two ejection flow channels (3-3), each backflow flow channel (3-4) is communicated with the bottom of the second blind hole and the outside of the short joint body (3-1), and the outlet of the backflow flow channel (3-4) is higher than the outlet of the ejection flow channel (3-3);
the one-way valve (3-2) is composed of a conical body (3-2-1) and a pressure spring (3-2-2); wherein, the conical body (3-2-1) is a cylinder structure with a closed top and an opening at the bottom; the pressure spring (3-2-2) is in a compressed state and is vertically arranged in the conical body (3-2-1), the top end of the pressure spring is abutted against the top surface of the conical body (3-2-1), and the bottom end of the pressure spring is press-fitted at the bottom of the first blind hole; the outer diameter of the conical body (3-2-1) is between the inner diameter of the annular boss on the supercharging nipple body (2-1) and the inner diameter of the first blind hole, so that the conical body is arranged in the first blind hole in a gap-existing mode, and the top end of the conical body is clamped at the top corner of the lower end of the annular boss.
2. The hydraulic auxiliary piston booster-type well bottom reverse circulation fishing tool according to claim 1, characterized in that the slider (4) is composed of a slider short section and a ball (4-1) randomly embedded on the outer wall of the slider short section; wherein, the slider short section is a cylindrical barrel structure, and a ball (4-1) embedded on the slider short section can freely rotate around 360 degrees.
3. The hydraulically assisted piston boosted downhole reverse circulation fishing tool according to claim 1, characterized in that the fisher (5) comprises a carrier (5-1), a plurality of splaying tabs (5-2) and a plurality of torsion springs (5-3); the supporting body (5-1) is of a cylindrical barrel structure, and the plurality of opening pieces (5-2) are arranged on the supporting body (5-1) in a manner that the vertex angles face the circumferential direction of the inner circle, with the central axis of the supporting body (5-1) as the center; the plurality of opening pieces (5-2) are respectively and movably fixed on the end surface of the top end of the bearing body (5-1) through a plurality of torsion springs (5-3) with the same number as the opening pieces and matched bolts; each torsion spring is in a pre-twisting state, so that the plurality of opening pieces (5-2) are close to each other inwards and close the top end opening of the bearing body (5-1); each opening sheet (5-2) is provided with a plurality of water filtering holes.
4. The hydraulically-assisted piston booster-type downhole reverse circulation fishing tool according to claim 1, characterized in that the width of the opening end sides of the two slide ways (2-2-2-2-1) is slightly smaller than the width of the slide ways, so as to form a limiting part, and the radial section of each slide way (2-2-2-2-1) is C-shaped.
5. The hydraulic auxiliary piston booster-type well bottom reverse circulation fishing tool according to claim 2, characterized in that the included angle formed by the axial direction of the inclined hole of the ejection flow channel (3-3) and the axial direction of the short joint body (3-1) is 60 degrees; the included angle formed by the axial direction of the return flow channel (3-4) and the axial direction of the short joint body (3-1) is 60 degrees.
6. A hydraulically assisted piston supercharged downhole reverse circulation fishing tool according to claim 3, characterized in that each opening piece (5-2) is an isosceles triangular slice with an apex angle of 40 °; the aperture of the water filtering hole is 10 mm; the torsion spring (5-3) adopts a torsion spring.
7. A hydraulically assisted piston supercharged downhole reverse circulation fishing tool according to claim 1, characterized in that the bottom end of the fisher (5) is connected with the milling tool by a lower coupling (6) in threaded connection.
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| US6308779B1 (en) * | 1999-09-16 | 2001-10-30 | Mcneilly A. Keith | Hydraulically driven fishing jars |
| CN201013279Y (en) * | 2007-03-07 | 2008-01-30 | 中国石化集团胜利石油管理局井下作业三公司 | Down-hole fluid flow reversing arrangement |
| WO2014085484A1 (en) * | 2012-11-27 | 2014-06-05 | American Certification And Pull Testing, Llc | Power tong and backup tong apparatus |
| US10221644B2 (en) * | 2016-01-04 | 2019-03-05 | Jason Swinford | Rotating tool |
| CN108729871B (en) * | 2017-04-25 | 2022-05-03 | 中国石油化工股份有限公司 | Fishing tool |
| CN209212193U (en) * | 2018-11-18 | 2019-08-06 | 牡丹江市林海石油打捞工具有限公司 | A kind of strong magnetic and reacting cycle combined type mince fisher |
| CN209145526U (en) * | 2018-11-28 | 2019-07-23 | 中国石油集团渤海钻探工程有限公司 | Horizontal well coiled tubing is pressurized cyclone sand washing device certainly |
| CN109751005B (en) * | 2019-03-06 | 2023-08-22 | 长江大学 | Repeatedly operable underground fishing tool |
| CN111734336B (en) * | 2020-06-01 | 2022-07-05 | 中国石油天然气股份有限公司 | Electric hydraulic restrictor fishing tool and fishing method thereof |
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