CN111911095A - Pressurized workover device and pressurized workover method for low-pressure oil-water well - Google Patents
Pressurized workover device and pressurized workover method for low-pressure oil-water well Download PDFInfo
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- CN111911095A CN111911095A CN202010830049.5A CN202010830049A CN111911095A CN 111911095 A CN111911095 A CN 111911095A CN 202010830049 A CN202010830049 A CN 202010830049A CN 111911095 A CN111911095 A CN 111911095A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000009434 installation Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 47
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 7
- 238000000354 decomposition reaction Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000009193 crawling Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 230000006872 improvement Effects 0.000 description 11
- 239000007788 liquid Substances 0.000 description 10
- 239000003129 oil well Substances 0.000 description 8
- 230000008439 repair process Effects 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 239000000565 sealant Substances 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005267 amalgamation Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000009194 climbing Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000004630 mental health Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 238000005406 washing Methods 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
-
- 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/14—Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/08—Wipers; Oil savers
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
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Abstract
The invention relates to a pressurized workover device and a pressurized workover method for a low-pressure oil-water well, wherein a blowout preventer stack is installed on an upper flange of a wellhead four-way through bolts, the blowout preventer stack sequentially comprises a single-gate blowout preventer from bottom to top, a four-way is arranged at the lower part of the single-gate blowout preventer, a double-gate slip blowout preventer is installed above the single-gate blowout preventer, an annular blowout preventer is installed above the double-gate slip blowout preventer, a hexagonal grid platform is arranged on the periphery of the middle section of the annular blowout preventer, a sunken collecting box is arranged below the hexagonal grid platform, the bottom of the sunken collecting box is supported on the ground through four support legs which are distributed in a rectangular shape, and the edge of the. The lower middle portion of the annular blowout preventer is located in the central cylinder. And two ends of the lower cross beam are respectively provided with a lifting hydraulic cylinder, and the two lifting hydraulic cylinders respectively vertically and upwards penetrate through the sleeve to be connected with the upper cross beam. And pre-connecting a blowout preventer stack before operation, installing a pressurized workover rig, and pulling out the oil pipe column. The invention can improve the wellhead environment, has low height, is convenient for integral removal and greatly shortens the installation time.
Description
Technical Field
The invention relates to an oil field operation tool, in particular to a pressurized workover device for a low-pressure oil-water well; the invention also relates to a pressurized workover method for the low-pressure oil-water well, and belongs to the technical field of pressurized workover operation.
Background
The wellhead device of the oil-water well comprises a wellhead four-way and various blowout preventers arranged above the wellhead four-way, and an oil pipe extends along the center of each blowout preventer. At present, the underground pressure of an oil-water well of an oil field can be classified according to three conditions of high pressure, medium pressure and low pressure, wherein the proportion of a low-pressure well is higher. However, the oil-water well pressurized workover device in the oil field is mostly a high-pressure operation device, and has the following defects:
firstly, in order to realize high-pressure seal construction, a plurality of half-seal blowout preventers, full-seal blowout preventers or annular blowout preventers are usually arranged, structural components are multiple, the height is mostly more than 5m, the overall height is too high, the installation is complicated, the operation is inconvenient, the safety is poor, the whole machine is not flexible to move and low in efficiency, the problem of low efficiency of a large horse trolley is solved aiming at a low-pressure well, and the existing oil field is not provided with a small pressurized workover rig aiming at the low-pressure well and having the height not more than 2 m.
When the well pressure is low and the phenomenon of jacking of the oil pipe cannot occur, in order to improve the construction progress, when the oil pipe is pulled down, the annular blowout preventer is usually adopted to seal the annular space of the oil pipe, so that the service life of the rubber core of the annular blowout preventer is short, the rubber core of the annular blowout preventer is frequently replaced, and the purchase cost is high.
Thirdly, in the conventional operation process of the oil-water well under-pressure well workover and the small overflow well, due to overflow caused by unsealing between the periphery of the oil pipe and the blowout preventer, liquid overflowing in the oil pipe brings serious pollution to a well site; in the process of lifting the oil pipe, when the oil pipe is not communicated or the lower part of the oil pipe is not provided with an oil drainage device, when a connecting screw thread of the oil pipe is disassembled, liquid in the oil pipe can rapidly flow downwards, dirty oil and water fall and splash to the upper plane of a flange of a blowout preventer, the environment pollution of a well mouth is caused, the construction environment is worsened, and the physical and mental health of operating personnel is influenced. The existing high-pressure operation device has no overflow collection function, and under the condition of higher and higher environmental protection requirements, how to realize the purposes of not influencing the operation speed and avoiding the well field from being polluted by overflow is always a difficult problem which puzzles the underground operation construction.
Disclosure of Invention
The invention aims to overcome the problems in the prior art, and provides a pressurized workover device for a low-pressure oil-water well, which has the advantages of overflowing collection function, environmental pollution reduction, construction wellhead environment improvement, safety and environmental protection requirement meeting, low height, convenience for integral moving and great shortening of installation time.
In order to solve the technical problem, the pressurized workover device for the low-pressure oil-water well comprises a wellhead cross joint, wherein a blowout preventer stack which is preassembled into a whole is mounted on an upper flange of the wellhead cross joint through bolts, the blowout preventer stack sequentially comprises a single-gate-plate blowout preventer, a double-gate-plate slip blowout preventer and an annular blowout preventer from bottom to top, the lower part of the single-gate-plate blowout preventer is provided with the cross joint, a hexagonal grid platform is arranged on the periphery of the middle section of the annular blowout preventer, a sunken collecting box is arranged below the hexagonal grid platform, the bottom of the sunken collecting box is supported on the ground through four support legs which are distributed in a rectangular shape, and the edge of the bottom of the sunken collecting box.
Compared with the prior art, the invention has the following beneficial effects: the hexagonal grid platform can provide operation platform for the workman operation, and in the overflow during well head operation can flow into the formula of sinking collecting box, be equipped with the overflow export by limit one side in the bottom half, the liquid that the oil pipe spilled over in the well is through the return bend water conservancy diversion of releasing to collecting big jar, can avoid the well head to pollute, has better environmental protection benefit. The blowout preventer stack is preassembled into a whole, so that the assembly time can be reduced, the rapid integral installation can be realized, the well repairing and stopping time can be shortened, and the well blowout risk after the components above the wellhead four-way are disassembled can be reduced; the lower part of the single ram blowout preventer is provided with a cross joint, and the cross joint can be connected with a well pipe or a casing releasing overflow without operating the cross joint of the wellhead, thereby reducing the influence on the flow of the wellhead. The single-ram blowout preventer and the double-ram slip blowout preventer are arranged on the front face of the lower portion of the platform in operating positions, so that the blowout preventers can be conveniently opened and closed. Slips of the double-ram slip blowout preventer can be matched with the operation of lifting an oil pipe. The device has few structural components, is simple, compact and light; the height of the hexagonal grid platform is greatly reduced, the height from the ground is not more than two meters, the operation is easy, and the safety of the operation of lifting and lowering the oil pipe is improved. Can be directly matched with a workover rig without modifying the workover rig. After the well repair of a certain oil well is completed, the under-pressure well repair device can be integrally moved and transported and directly and integrally installed on an upper flange of a wellhead four-way joint, so that the installation time can be shortened by over 40%, the work load of the well repair is greatly reduced, and the efficiency of the well repair operation is improved.
As an improvement of the invention, a through central cylinder is welded at the center of the bottom wall of the sunken collecting box, a bell mouth with a large lower part and a small upper part is arranged at the lower part of the central cylinder, the upper end mouth of the central cylinder extends to the upper part of the hexagonal grid platform, and the middle lower part of the annular blowout preventer is positioned in the central cylinder. The central cylinder enables the annular blowout preventer to penetrate through the sunken collecting box and can realize sealing; the bell mouth of central drum lower extreme is convenient for embolia annular preventer, and the last port of central drum is higher than hexagonal grid platform, and the formula of sinking collecting box overflows to central drum.
As a further improvement of the invention, the bottom wall of the sunken collecting box is welded with two through sleeves, the two sleeves are symmetrically positioned at the left side and the right side of the central cylinder, and the upper ports of the two sleeves extend to the upper part of the hexagonal grid platform. The sleeve enables the lifting hydraulic cylinder to penetrate through the sunken collecting box and can realize sealing; the upper port of the sleeve is higher than the hexagonal grid platform, and the sunken collecting box overflows to the sleeve.
As a further improvement of the single-ram blowout preventer, a lower cross beam is sleeved on the periphery of an upper flange of the single-ram blowout preventer, the lower cross beam is formed by splicing and fixing two symmetrical halves in front and back, two ends of the lower cross beam are respectively provided with a lifting hydraulic cylinder, the two lifting hydraulic cylinders respectively vertically and upwards penetrate through the sleeve to be connected with an upper cross beam, and a slip mounting hole is formed in the center of the upper cross beam. The lower cross beam is of a half-and-half structure, so that the front side and the rear side of the lower cross beam can be spliced oppositely and connected into a whole after splicing to be used as a supporting base of the lifting hydraulic cylinder; slips are arranged in slip mounting holes of the upper cross beam and are clasped on the periphery of the pipe column, the lifting hydraulic cylinder can lift 1.5 meters at a time, each ascending stroke of the pipe column is controlled, and the phenomenon that the pipe column flies out due to underground pressure is avoided; the descending operation also depends on the lifting hydraulic cylinder to control the action stroke of each time, so that the operation safety is improved; the weight of the lifting hydraulic cylinder during lifting or pressing is borne by the lower cross beam.
As a further improvement of the invention, the middle parts of the two left supporting legs in the height direction are connected with each other through a left crosspiece, and a left support extending rightwards is arranged in the middle part of the left crosspiece; the middle parts of the two right supporting legs in the height direction are connected with each other through a right crosspiece, and a right support extending leftwards is arranged in the middle of the right crosspiece; and support mounting holes are respectively formed in the left support and the right support, and the left end and the right end of the lower cross beam are correspondingly supported and fixed on the left support and the right support. Left crosspiece and right crosspiece can improve the intensity and the rigidity of landing leg, improve the stability of operation, the both ends of lifting hydraulic cylinder are fixed on left support and right support simultaneously, and the both ends of bottom end rail make whole device become a whole with left support and right support fixed connection, and the integral hoisting of being convenient for is transported, has reduced the decomposition and has dismantled, and the process of reassembly has practiced thrift workover and shut down the well time by a wide margin, has improved the oil production volume of oil well. The weight of the lifting hydraulic cylinder during lifting or lowering of the pipe column is transmitted to the supporting legs through the left support and the right support, the lifting weight is prevented from falling on the single-ram blowout preventer, and the design is favorable for installation, disassembly and maintenance of the blowout preventer.
As a further improvement of the invention, a port sealing element is embedded in an upper port of the central cylinder, the port sealing element comprises a vertical annular sealing ring which is embedded between the inner wall of the central cylinder and the outer wall of the annular blowout preventer from top to bottom, the cross section of the vertical annular sealing ring is in a wedge shape with a wide upper part and a narrow lower part, the top of the vertical annular sealing ring is connected with a slope rubber ring which is turned outwards, the slope rubber ring is in a structure with a high inner part and a low outer part and covers the upper end of the central cylinder, and the outer diameter of the slope rubber ring is larger than the outer diameter of the central. Vertical annular seal circle is the wedge, is convenient for insert between central drum inner wall and the annular preventer outer wall and compresses tightly, outside domatic glue ring height in, cover at the upper end of central drum and extend to its outside, is convenient for guide the periphery of central drum with the liquid that falls on it and falls, avoids leaking to ground along the periphery of annular preventer.
As a further improvement of the invention, the middle parts of the two supporting legs at the rear side in the height direction are connected with each other through a rear crosspiece, and the bottom of the front surface of the sunken collecting box is provided with a chamfer. Three sides of the middle parts of the four supporting legs are connected with reinforcing crosspieces, and crosspieces are not arranged right in front of the four supporting legs, so that space for operating the blowout preventer can be provided, and inspection and maintenance are facilitated; the chamfer just in front of the sunken collecting box can prevent the head from being damaged by sharp corners when workers operate the blowout preventer.
As a further improvement of the invention, the upper port of the sunken collecting box is provided with an inner step, the peripheries of the central cylinder and the sleeve close to the upper port are respectively provided with an outer convex ring, the outer edge of the hexagonal grid platform is supported on the inner step of the upper port of the sunken collecting box, and the inner edge of the hexagonal grid platform is supported on the outer convex rings at the upper parts of the central cylinder and the sleeve. On one hand, the inner steps and the outer convex rings provide support for the hexagonal grid platform, and on the other hand, the vertical wall of the upper port of the sunken collecting box, the central cylinder and the upper part of the sleeve provide positioning for the hexagonal grid platform, so that the hexagonal grid platform can be quickly installed and positioned, the play of the hexagonal grid platform is avoided, and the safety of workers operating on the platform is improved.
As a further improvement of the invention, the bottom of the inner cavity of the sunken collecting box is provided with a reinforcing beam extending along the bottom wall, the top of the supporting leg is supported below the node of the reinforcing beam, and the bottom of each reinforcing beam is provided with a transversely through water drainage hole; the hexagonal grid platform is formed by splicing a plurality of plates, and each splicing seam extends along the diameter extension line of the central cylinder and the sleeve. The stiffening beam can improve the intensity of formula of sinking collecting box and whole device, and the bottom of the groined type net that the stiffening beam formed communicates each other through the outlet, makes the deposit liquid of formula of sinking collecting box bottom all can arrange completely through the return bend of releasing, reduces the risk of pollution when wholly moving. The hexagonal grid platform is formed by the multi-disc amalgamation, and the amalgamation seam extends along central drum and telescopic diameter extension line, after adjacent two break away from the interior bench of sunken collecting box upper port, can take out to one side, and it is very convenient to dismantle and assemble, also is convenient for transport.
As a further improvement of the invention, a ladder stand is arranged on the left front side or the right front side of the hexagonal grid platform, the rest five edges of the upper port of the sunken collecting box except the ladder stand are respectively welded with a railing inserting tube, vertical railings are respectively inserted in the railing inserting tubes, and the tops of the vertical railings are connected with each other through a transverse railing. The crawling ladder is offset on one side right in front of the hexagonal grid platform, so that workers can conveniently operate on the platform, space right in front is avoided, and the blowout preventer can conveniently operate on a well; the rail that vertical railing and horizontal railing constitute protects the safe operation of workman on the platform.
As a further improvement of the invention, the upper part of the annular blowout preventer is provided with the simple self-sealing blowout preventer, the lower end of a flange of the simple self-sealing blowout preventer is embedded with a sealing rubber core, a central hole of the sealing rubber core is provided with at least two throats, the upper end of the flange of the simple self-sealing blowout preventer is provided with an upper convex ring, an inner cavity of the upper convex ring is provided with a centering ring, four phases of the upper convex ring are respectively screwed with adjusting screws, and the inner end of each adjusting screw is respectively abutted against the outer wall of the centering ring. The rubber core of the annular blowout preventer is in soft sealing with the oil pipe, but after the rubber core is used for multiple times, the rubber core of the annular blowout preventer needs to be replaced, and the purchase cost is increased. The centering ring of the device is sleeved on the periphery of an oil pipe, and through the adjustment of four adjusting screws, the centering ring and the sealant core are accurately centered, the sealant core and the oil pipe column are coaxial, and reliable self-sealing is realized between the sealant core and the oil pipe column. The simple self-sealing blowout preventer can be used for replacing an annular blowout preventer to seal an annular space during low-pressure operation at ordinary times, so that the using amount of rubber cores of the annular blowout preventer is saved, and the purchasing cost of the rubber cores of the annular blowout preventer is reduced by over 60 percent.
Another object of the present invention is to overcome the problems in the prior art, and to provide a method for repairing a low pressure oil-water well under pressure, which can collect the overflow of an oil pipe, avoid environmental pollution, improve the environment of a construction wellhead, meet the environmental protection requirements, have good safety, facilitate the overall removal of the next well repairing, and greatly shorten the installation time.
In order to solve the technical problems, the invention discloses a pressurized workover method for a low-pressure oil-water well, which sequentially comprises the following steps: step 1: preparing before operation; step 1.1: manufacturing a hexagonal grid platform and a sunken collecting box, welding a central cylinder at the center of the sunken collecting box, and respectively welding sleeves at two sides of the central cylinder; step 1.2: the single ram blowout preventer, the double ram slip blowout preventer, the annular blowout preventer and the simple self-sealing blowout preventer are connected in advance from bottom to top in sequence to form a blowout preventer group; step 2: installing a pressurized workover rig; step 2.1: putting a blanking plug into an inner cavity of the oil pipe; step 2.2: removing the part above a flange on the wellhead four-way, and installing a blowout preventer stack above the wellhead four-way; step 2.3: sleeving a central cylinder of the sunken collecting box on the periphery of the annular blowout preventer, and supporting legs at the bottom of the sunken collecting box on the ground; step 2.4: the method comprises the following steps that a lifting hydraulic cylinder penetrates through a sleeve of a sunken collecting box, the lower end of the lifting hydraulic cylinder is connected with a lower cross beam, two ends of the lower cross beam are supported on a left support and a right support which are fixed on a crosspiece of a supporting leg, the upper end of the lifting hydraulic cylinder is connected with an upper cross beam, and a movable slip is installed in a slip installing hole in the center of the upper cross beam; and step 3: pulling out the oil pipe column; step 3.1: lifting the oil pipe column by using a workover rig, lifting most of oil pipes, and discharging accumulated water of each oil pipe into a sunken collecting box; step 3.2: when the self weight of the residual tubing string is not enough to overcome the jacking force generated by the underground pressure, the floating slips are adopted to clamp the tubing string; step 3.3: lifting a piston rod of a lifting hydraulic cylinder upwards to lift a tubing string for a certain distance, then clamping a tubing string by a slip of the double-ram slip blowout preventer, loosening a traveling slip, retracting the piston rod of the lifting hydraulic cylinder, and moving an upper cross beam and the traveling slip downwards for a certain distance; step 3.4: the floating slips clamp the oil pipe column again, the slips of the double-ram slip blowout preventer are loosened, then a piston rod of the lifting hydraulic cylinder is lifted upwards again, the rest oil pipes are lifted up one by one in this way, accumulated water of each oil pipe is discharged into the sunken collecting box, and then the single-ram blowout preventer is closed; and 4, step 4: a new oil pipe column is put into the well; and 5: and the decomposition blowout preventer stack is connected with the four-way upper flange of the wellhead, so that the whole pressurized workover rig is hoisted and transported.
Compared with the prior art, the invention has the following beneficial effects: the hexagonal grid platform can provide operation platform for the workman operation, and in the overflow during well head operation can flow into the formula of sinking collecting box, be equipped with the overflow export by limit one side in the bottom half, the liquid that the oil pipe spilled over in the well is through the return bend water conservancy diversion of releasing to collecting big jar, can avoid the well head to pollute, has better environmental protection benefit. When the well is shut down, the single ram blowout preventer is adopted to directly and fully close the well, hydraulic locking is not needed, and the well is safe and reliable. Through the alternate matching of the traveling slips and the slips of the double-gate slip blowout preventer, the lifting hydraulic cylinder overcomes the jacking force of the oil pipe, the lifting stroke of the oil pipe column at each time is controlled, and the situation that the oil pipe column flies out of control due to the jacking force generated by the underground pressure is avoided. Because simple structure is compact, the height of hexagonal grid platform reduces by a wide margin, and the height apart from ground is no more than two meters, easily operates, improves the security of oil pipe operation down. Can be directly matched with a workover rig without modifying the workover rig. After a certain oil well is repaired, the oil well is convenient to integrally move and transport due to small volume, low height and light weight, and is directly and integrally installed on the upper flange of the wellhead four-way joint, so that the installation time can be shortened by more than 40%, the workload of repairing the well is greatly reduced, and the efficiency of repairing the well is improved.
As a refinement of the present invention, step 4 comprises the following substeps: step 4.1: closing a bottom opening and closing tool of the new oil pipe column, and then opening the single ram blowout preventer; step 4.2: clamping a new oil pipe column by adopting a traveling slip, then pulling down an upper cross beam by a lifting hydraulic cylinder to enable the new oil pipe column to descend for a certain distance, then clamping the new oil pipe column by a slip of a double-ram slip blowout preventer, then loosening the traveling slip, extending out a piston rod of the lifting hydraulic cylinder, and moving the upper cross beam and the traveling slip for a certain distance; step 4.3: the traveling slips clamp the oil pipe column again, the slips of the double-ram slip blowout preventer are loosened, then the lifting hydraulic cylinder is pulled down again, and therefore a plurality of new oil pipes are put into the well; step 4.4: when the dead weight of the new oil pipe column is enough to overcome the jacking force generated by the underground pressure, the moving slips are loosened, and the new oil pipe column is continuously lowered by adopting the workover rig until the whole new oil pipe column is lowered into the well. When a new oil pipe column is put into the well initially, the floating slips and the slips of the double-gate slip blowout preventer are alternately matched, the lifting hydraulic cylinder overcomes the jacking force of the oil pipe, the oil pipe column is gradually pressed down, the oil pipe column is ensured to be smoothly put into the well, when the weight of the underground oil pipe column is greater than the jacking force generated by the underground pressure, the workover rig is changed to continue to put the new oil pipe column, the pipe putting speed can be increased, and the safety and the well repairing efficiency are both considered.
Drawings
The invention will be described in further detail with reference to the following drawings and detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.
Fig. 1 is a front view of the pressurized workover rig for a low-pressure oil-water well of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a first perspective view of fig. 1.
Fig. 4 is a second perspective view of fig. 1.
FIG. 5 is a front view of the sink collection box and hexagonal grid platform of the present invention.
Fig. 6 is a top view of fig. 5.
Fig. 7 is a first perspective view of fig. 5.
Fig. 8 is a second perspective view of fig. 5.
FIG. 9 is a cross-sectional view of the simple self-sealing blowout preventer of the present invention.
Fig. 10 is a cross-sectional view of a port seal of the present invention.
In the figure: 1. a wellhead cross joint; 2. a single ram blowout preventer; 2a, a single flashboard four-way joint; 3. a dual ram slip blowout preventer; 4. an annular blowout preventer; 5. the simple self-sealing blowout preventer; 5a, sealing the rubber core; 5a1. throat; 5b, an upper convex ring; 5c, a centralizing ring; 5d, adjusting the screw; 6. a sink type collection box; 6a, an inner step; 6b, a discharge elbow; 6c. a central cylinder; 6d, a sleeve; 6e. a stiffening beam; 7. a support leg; 7a, a left crosspiece; 7b, a right crosspiece; 7c, a rear crosspiece; 7d, a left support; 7e, a right support; 7f, a support mounting hole; 8. a hexagonal grid platform; 9. a lower cross beam; 10. a lifting hydraulic cylinder; 11. an upper cross beam; a slip mounting hole; 12. climbing a ladder; 13. a vertical rail; 14. a transverse rail; 15. a port seal; 15a, a vertical annular sealing ring; and 15b, a slope rubber ring.
Detailed Description
As shown in fig. 1 to 8, the pressurized workover rig for low-pressure oil-water wells comprises a single-gate ram blowout preventer 2 arranged above a wellhead cross 1, the lower part of the single-gate ram blowout preventer 2 is provided with a cross, a double-gate slip blowout preventer 3 is arranged above the single-gate ram blowout preventer 2, an annular blowout preventer 4 is arranged above the double-gate slip blowout preventer 3, a hexagonal grid platform 8 is arranged on the periphery of the middle section of the annular blowout preventer 4, a sunken collecting box 6 is arranged below the hexagonal grid platform 8, the bottom of the sunken collecting box 6 is supported on the ground through four support legs 7 which are distributed in a rectangular shape, and the edge of the bottom of the sunken collecting box 6 is connected with a discharge elbow 6b.
The hexagonal grid platform 8 can provide operation platform for the workman's operation, and the overflow during well head operation can flow into in the formula of sinking collecting box 6, is equipped with the overflow export by limit one side in the bottom half, and the liquid that the oil pipe spilled over in the well is through the return bend 6b water conservancy diversion of releasing to collecting big jar, can avoid the well head to pollute, has better environmental protection benefit. The lower part of the single-ram blowout preventer 2 is provided with a cross joint, and the single-ram cross joint 2a can be used for washing a well pipeline or releasing casing overflow without operating the wellhead cross joint 1, so that the influence on a wellhead flow is reduced. The single ram preventer 2 and the double ram slip preventer 3 are arranged on the front side of the lower part of the platform at the operating positions, so that the well opening and closing operation of the preventer is facilitated, and when the single ram preventer 2 is used for directly and completely closing the well, hydraulic locking is not needed, and the system is safe and reliable. Slips of the double-ram slip blowout preventer 3 can be matched with the operation of lifting an oil pipe. The device has few structural components, is simple, compact and light; the height of the hexagonal grid platform 8 is greatly reduced, the height from the ground is not more than two meters, the operation is easy, and the safety of the operation of lifting and lowering the oil pipe is improved. Can be directly matched with a workover rig without modifying the workover rig. After the well repair of a certain oil well is completed, the under-pressure well repair device can be integrally moved and transported and directly and integrally installed on an upper flange of a wellhead four-way joint, so that the installation time can be shortened by over 40%, the work load of the well repair is greatly reduced, and the efficiency of the well repair operation is improved.
As shown in fig. 5 to 8, a through central cylinder 6c is welded at the center of the bottom wall of the sunken collection box 6, a bell mouth with a large lower part and a small upper part is arranged at the lower part of the central cylinder 6c, the upper end port of the central cylinder 6c extends to the upper part of the hexagonal grid platform 8, and the middle lower part of the annular blowout preventer 4 is positioned in the central cylinder 6c. The central cylinder 6c allows the annular blowout preventer 4 to pass through the sunken collection tank 6 and sealing can be achieved; the bell mouth at the lower end of the central cylinder 6c is convenient for being sleeved into the annular blowout preventer 4, the upper port of the central cylinder 6c is higher than the hexagonal grid platform 8, and the sunken collecting box 6 overflows to the central cylinder 6c.
Two through sleeves 6d are welded on the bottom wall of the sunken collecting box 6, the two sleeves 6d are symmetrically positioned on the left side and the right side of the central cylinder 6c, and the upper ports of the two sleeves 6d extend to the upper part of the hexagonal grid platform 8. The sleeve 6d enables the lifting hydraulic cylinder 10 to pass through the sunken collecting box 6 and realize sealing; the upper port of the sleeve 6d is higher than the hexagonal grid platform 8, and the sunken collecting box 6 overflows to the sleeve 6d.
As shown in fig. 1 to 4, a lower beam 9 is sleeved on the periphery of an upper flange of the single ram blowout preventer 2, the lower beam 9 is formed by splicing and fixing two symmetrical halves in front and back, two ends of the lower beam 9 are respectively provided with a lifting hydraulic cylinder 10, the two lifting hydraulic cylinders 10 respectively vertically and upwardly penetrate through a sleeve 6d to be connected with an upper beam 11, and a slip mounting hole 11a is formed in the center of the upper beam 11. The lower cross beam 9 is of a half-and-half structure, so that the front side and the rear side of the lower cross beam can be spliced oppositely, and the lower cross beam and the front side and the rear side of the lower cross beam are connected into a whole after being spliced to be used as a supporting base of the lifting hydraulic cylinder 10; slips are arranged in slip mounting holes 11a of the upper cross beam 11 and are clasped on the periphery of the pipe column, the lifting hydraulic cylinder 10 can lift 1.5 meters at a time, each ascending stroke of the pipe column is controlled, and the phenomenon that the pipe column flies out due to underground pressure is avoided; descending also depends on the lifting hydraulic cylinder 10 to control each action stroke, so that the operation safety is improved; the weight of the lifting cylinder 10 when lifted or pressed down is taken up by the lower cross beam 9.
The middle parts of the two left supporting legs 7 in the height direction are connected with each other through a left crosspiece 7a, and a left support 7d extending rightwards is arranged in the middle part of the left crosspiece 7 a; the middle parts of the two right supporting legs 7 in the height direction are connected with each other through a right crosspiece 7b, and the middle part of the right crosspiece 7b is provided with a right support 7e extending leftwards; and the left support 7d and the right support 7e are respectively provided with a support mounting hole 7f, and the left end and the right end of the lower cross beam 9 are correspondingly supported and fixed on the left support 7d and the right support 7e. Left crosspiece 7a and right crosspiece 7b can improve landing leg 7's intensity and rigidity, improve the stability of operation, the both ends of lifting hydraulic cylinder 10 are fixed on left support 7d and right support 7e simultaneously, the both ends of bottom end rail 9 make whole device become a whole with left support 7d and right support 7e fixed connection, the integral hoisting of being convenient for is transported, the decomposition is reduced and the dismantlement, the process of reassembly has been practiced thrift, well workover and shut-in time have been practiced thrift by a wide margin, the oil production volume of oil well has been improved. The weight of the lifting hydraulic cylinder 10 during lifting or lowering of the pipe string is transmitted to the supporting legs 7 through the left support 7d and the right support 7e, the lifting weight is prevented from falling on the single ram blowout preventer 2, and the design is favorable for installation, disassembly and maintenance of the blowout preventer.
As shown in fig. 10, a port sealing member 15 is embedded in an upper port of the central cylinder 6c, the port sealing member 15 includes a vertical annular sealing ring 15a embedded between an inner wall of the central cylinder 6c and an outer wall of the annular blowout preventer 4 from top to bottom, a cross section of the vertical annular sealing ring 15a is in a shape of a wedge with a wide top and a narrow bottom, a slope rubber ring 15b which is turned over outwards is connected to a top of the vertical annular sealing ring 15a, the slope rubber ring 15b is in a structure with a high inside and a low outside and covers the upper end of the central cylinder 6c, and an outer diameter of the slope rubber ring 15b is larger than an outer diameter. Vertical annular seal ring 15a is the wedge, is convenient for insert between central drum 6c inner wall and the annular preventer 4 outer wall and compress tightly, outside domatic rubber ring 15b is interior high, covers in the upper end of central drum 6c and extends to its outside, is convenient for guide the periphery of central drum 6c to the liquid that falls on it and falls, avoids leaking to ground along the periphery of annular preventer 4.
As shown in fig. 7 and 8, the middle parts of the two legs 7 at the rear side in the height direction are connected with each other through a rear crosspiece 7c, and the bottom part of the front surface of the sunken collecting box 6 is provided with a chamfer. Three sides of the middle parts of the four supporting legs 7 are connected with reinforcing crosspieces, and crosspieces are not arranged right in front of the middle parts, so that space for operating the blowout preventer can be provided, and inspection and maintenance are facilitated; the chamfer angle in front of the sunken collecting box 6 can prevent the head from being damaged by sharp corners when workers operate the blowout preventer.
The upper port of the sunken collecting box 6 is provided with an inner step 6a, the peripheries of the central cylinder 6c and the sleeve 6d close to the upper port are respectively provided with an outer convex ring, the outer edge of the hexagonal grid platform 8 is supported on the inner step of the upper port of the sunken collecting box 6, and the inner edge of the hexagonal grid platform 8 is supported on the outer convex rings on the upper parts of the central cylinder 6c and the sleeve 6d. On one hand, the step 6a and the outer convex ring provide support for the hexagonal grid platform 8, and on the other hand, the vertical wall of the upper port of the sunken collecting box 6, the central cylinder 6c and the upper part of the sleeve 6d provide positioning for the hexagonal grid platform 8, so that the hexagonal grid platform 8 can be quickly installed and positioned, the movement of the hexagonal grid platform is avoided, and the safety of workers operating on the platform is improved.
The bottom of the inner cavity of the sunken collecting box 6 is provided with a reinforcing beam 6e extending along the bottom wall, the top of the supporting leg 7 is supported below the node of the reinforcing beam 6e, and the bottom of each reinforcing beam 6e is provided with a transversely through water drainage hole; the hexagonal grid platform 8 is formed by splicing a plurality of pieces, and each splicing seam extends along the diameter extension line of the central cylinder 6c and the sleeve 6d respectively. The stiffening beam 6e can improve the intensity of the sunken collecting box 6 and the whole device, the bottoms of the # -shaped grids formed by the stiffening beam 6e are communicated with each other through the drain holes, so that the liquid stored at the bottom of the sunken collecting box 6 can be drained completely through the drain elbow 6b, and the risk of pollution during the whole moving process is reduced. The hexagonal grid platform 8 is formed by the multi-disc amalgamation, and the amalgamation seam extends along the diameter extension line of central drum 6c and sleeve 6d, after adjacent two break away from the interior step 6a of sunken collecting box 6 upper port, can take out to one side, and it is very convenient to dismantle and assemble, also is convenient for transport.
As shown in fig. 1 to 4, a ladder stand 12 is arranged on the left front side or the right front side of the hexagonal grid platform 8, barrier inserting pipes are respectively welded on the rest five edges of the upper port of the sunken collecting box 6 except the ladder stand 12, vertical barriers 13 are respectively inserted into each barrier inserting pipe, and the tops of the vertical barriers 13 are connected with each other through a transverse barrier 14. The crawling ladder 12 is offset on one side right in front of the hexagonal grid platform 8, so that workers can conveniently operate on the platform, and meanwhile, space right in front is avoided, and the blowout preventer can conveniently operate to open and close a well; the fence formed by the vertical railings 13 and the transverse railings 14 protects workers from safe operation on the platform.
As shown in fig. 1 and 9, the simple self-sealing blowout preventer 5 is installed on the upper portion of the annular blowout preventer 4, a sealing rubber core 5a is embedded at the lower end of a flange of the simple self-sealing blowout preventer 5, at least two throats 5a1 are arranged in a center hole of the sealing rubber core 5a, an upper convex ring 5b is arranged at the upper end of the flange of the simple self-sealing blowout preventer 5, a centering ring 5c is arranged in an inner cavity of the upper convex ring 5b, adjusting screws 5d are respectively screwed in four phases of the upper convex ring 5b, and inner ends of the adjusting screws 5d respectively abut against the outer wall of the centering ring 5c. Soft sealing is realized between the rubber core of the annular blowout preventer 4 and the oil pipe, but after the annular blowout preventer 4 is used for many times, the rubber core of the annular blowout preventer 4 needs to be replaced, and the purchase cost is increased. The centering ring 5c of the device is sleeved on the periphery of an oil pipe, and through the adjustment of four adjusting screws 5d, the centering ring 5c and the sealant core 5a are accurately centered, the sealant core 5a and the oil pipe column are coaxial, and reliable self-sealing between the sealant core 5a and the oil pipe column is realized. The simple self-sealing blowout preventer 5 can be used for replacing the annular blowout preventer 4 to seal the annular space during low-pressure operation at ordinary times, so that the usage amount of the rubber core of the annular blowout preventer is saved, and the purchase cost of the rubber core of the annular blowout preventer is reduced by over 60 percent.
The invention relates to a pressurized well repairing method of a low-pressure oil-water well, which sequentially comprises the following steps:
step 1: preparation before work
Step 1.1: manufacturing a hexagonal grid platform 8 and a sunken collecting box 6, welding a central cylinder 6c at the center of the sunken collecting box 6, and respectively welding sleeves 6d at two sides of the central cylinder 6 c;
step 1.2: the single ram blowout preventer 2, the double ram slip blowout preventer 3, the annular blowout preventer and the simple self-sealing blowout preventer 5 are connected in advance from bottom to top in sequence to form a blowout preventer group;
step 2: installation pressurized workover device
Step 2.1: putting a blanking plug into an inner cavity of the oil pipe;
step 2.2: removing the part above a flange on the wellhead four-way, and installing a blowout preventer stack above the wellhead four-way 1;
step 2.3: sleeving a central cylinder 6c of the sunken collecting box 6 on the periphery of the annular blowout preventer, and supporting legs 7 at the bottom of the sunken collecting box 6 are supported on the ground;
step 2.4: a lifting hydraulic cylinder 10 penetrates through a sleeve 6d of the sunken collecting box 6, the lower end of the lifting hydraulic cylinder 10 is connected with a lower cross beam 9, two ends of the lower cross beam 9 are supported on a left support 7d and a right support 7e which are fixed on a crosspiece of a supporting leg, the upper end of the lifting hydraulic cylinder 10 is connected with an upper cross beam 11, and a movable slip is installed in a slip installing hole 11a in the center of the upper cross beam 11;
and step 3: oil extraction pipe column
Step 3.1: lifting the oil pipe column by using a workover rig, lifting most of oil pipes, and discharging accumulated water of each oil pipe into the sunken collecting box 6;
step 3.2: when the self weight of the residual tubing string is not enough to overcome the jacking force generated by the underground pressure, the floating slips are adopted to clamp the tubing string;
step 3.3: a piston rod of the lifting hydraulic cylinder 10 is lifted upwards to lift the tubing string for a certain distance, then slips of the double-ram slip blowout preventer 3 clamp the tubing string, then the traveling slips are loosened, the piston rod of the lifting hydraulic cylinder 10 retracts, and the upper cross beam 11 and the traveling slips move downwards for a certain distance;
step 3.4: the traveling slips clamp the oil pipe column again, the slips of the double-gate slip blowout preventer 3 are loosened, then the piston rod of the lifting hydraulic cylinder 10 is lifted upwards again, the rest oil pipes are lifted up one by one in this way, accumulated water of each oil pipe is discharged into the sunken collecting box 6, and then the single-gate blowout preventer 2 is closed;
and 4, step 4: a new oil pipe column is put into the well;
and 5: and the decomposition blowout preventer stack is connected with the upper flange of the wellhead four-way 1, so that the whole pressurized workover rig is hoisted and transported.
The hexagonal grid platform 8 can provide operation platform for the workman's operation, and the overflow during well head operation can flow into in the formula of sinking collecting box 6, is equipped with the overflow export by limit one side in the bottom half, and the liquid that the oil pipe spilled over in the well is through the return bend 6b water conservancy diversion of releasing to collecting big jar, can avoid the well head to pollute, has better environmental protection benefit. When the well is shut down, the single ram blowout preventer 2 is adopted to directly and fully close the well, hydraulic locking is not needed, and the well is safe and reliable. Through the alternate matching of the traveling slips and the slips of the double-gate slip blowout preventer, the lifting hydraulic cylinder 10 overcomes the jacking force of the oil pipe, the lifting stroke of the oil pipe column at each time is controlled, and the situation that the oil pipe column flies out of control due to the jacking force generated by the underground pressure is avoided. Because simple structure is compact, the height of hexagonal grid platform 8 reduces by a wide margin, and the height apart from ground is no more than two meters, easily operates, improves the security of oil pipe operation down. Can be directly matched with a workover rig without modifying the workover rig. After a certain oil well is repaired, the oil well is convenient to integrally move and transport due to small volume, low height and light weight, and is directly and integrally installed on the upper flange of the wellhead four-way joint, so that the installation time can be shortened by more than 40%, the workload of repairing the well is greatly reduced, and the efficiency of repairing the well is improved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention. Technical features of the present invention which are not described may be implemented by or using the prior art, and will not be described herein.
Claims (13)
1. The utility model provides a well workover rig is pressed in area to low pressure oil-water well, includes well head cross, its characterized in that: the wellhead four-way blowout preventer is characterized in that a blowout preventer group which is preassembled into a whole is mounted on an upper flange of the wellhead four-way through bolts, the blowout preventer group sequentially comprises a single-gate-plate blowout preventer, a double-gate-plate slip blowout preventer and an annular blowout preventer from bottom to top, the lower part of the single-gate-plate blowout preventer is provided with the four-way, a hexagonal grid platform is arranged on the periphery of the middle section of the annular blowout preventer, a sunken collecting box is arranged below the hexagonal grid platform, the bottom of the sunken collecting box is supported on the ground through four support legs which are distributed in a rectangular shape, and the edge of.
2. The pressurized workover rig for low-pressure oil-water wells according to claim 1, wherein: the bottom wall center welding of formula that sinks collecting box has a center drum that link up, the lower part of center drum is equipped with big end down's horn mouth, the last port of center drum extends to the top of hexagonal grid platform, the well lower part of annular preventer is located in the center drum.
3. The pressurized workover device for the low-pressure oil-water well as claimed in claim 2, wherein: the bottom wall of the sunken collecting box is further welded with two through sleeves, the two sleeves are symmetrically located on the left side and the right side of the central cylinder, and upper ports of the two sleeves extend to the position above the hexagonal grid platform.
4. The pressurized workover rig for low-pressure oil-water wells according to claim 3, wherein: the single ram preventer is characterized in that a lower cross beam is sleeved on the periphery of an upper flange of the single ram preventer, the lower cross beam is formed by splicing and fixing two symmetrical halves in the front and back direction, lifting hydraulic cylinders are respectively installed at two ends of the lower cross beam, the two lifting hydraulic cylinders respectively vertically and upwards penetrate through the sleeve and are connected with the upper cross beam, and a slip mounting hole is formed in the center of the upper cross beam.
5. The pressurized workover device for the low-pressure oil-water well according to claim 4, wherein: the middle parts of the two left supporting legs in the height direction are connected with each other through a left crosspiece, and a left support extending rightwards is arranged in the middle of the left crosspiece; the middle parts of the two right supporting legs in the height direction are connected with each other through a right crosspiece, and a right support extending leftwards is arranged in the middle of the right crosspiece; and support mounting holes are respectively formed in the left support and the right support, and the left end and the right end of the lower cross beam are correspondingly supported and fixed on the left support and the right support.
6. The pressurized workover rig for low-pressure oil-water wells according to claim 5, wherein: the middle parts of the two supporting legs at the rear side in the height direction are connected with each other through a rear crosspiece, and a chamfer is arranged at the bottom right in front of the sunken collecting box.
7. The pressurized workover device for the low-pressure oil-water well according to claim 4, wherein: the upper port of the central cylinder is embedded with a port sealing piece, the port sealing piece comprises a vertical annular sealing ring which is embedded between the inner wall of the central cylinder and the outer wall of the annular blowout preventer from top to bottom, the cross section of the vertical annular sealing ring is in a wedge shape with a wide upper part and a narrow lower part, the top of the vertical annular sealing ring is connected with a slope rubber ring which is turned outwards, the slope rubber ring is in a structure with a high inner part and a low outer part and covers the upper end of the central cylinder, and the outer diameter of the slope rubber ring is larger than the outer diameter of the central.
8. The pressurized workover rig for low-pressure oil-water wells according to claim 3, wherein: the upper port of the sunken collecting box is provided with an inner step, the peripheries of the central cylinder and the sleeve, which are close to the upper port, are respectively provided with an outer convex ring, the outer edge of the hexagonal grid platform is supported on the inner step of the upper port of the sunken collecting box, and the inner edge of the hexagonal grid platform is supported on the outer convex rings on the upper parts of the central cylinder and the sleeve.
9. The pressurized workover rig for low-pressure oil-water wells according to claim 8, wherein: the bottom of the inner cavity of the sunken collecting box is provided with a reinforcing beam extending along the bottom wall, the top of each supporting leg is supported below the node of the reinforcing beam, and the bottom of each reinforcing beam is provided with a transversely through water drainage hole; the hexagonal grid platform is formed by splicing a plurality of plates, and each splicing seam extends along the diameter extension line of the central cylinder and the sleeve.
10. The pressurized workover rig for low-pressure oil-water wells according to claim 8, wherein: the left front side or the right front side of the hexagonal grid platform is provided with a crawling ladder, other five edges of the upper port of the sunken collecting box except the crawling ladder are respectively welded with a railing inserting pipe, vertical railings are respectively inserted in the railing inserting pipes, and the tops of the vertical railings are connected with each other through transverse railings.
11. The pressurized workover rig for low-pressure oil-water wells according to any one of claims 1 to 10, wherein: the simple self-sealing blowout preventer is mounted on the upper portion of the annular blowout preventer, a sealing rubber core is embedded at the lower end of a flange of the simple self-sealing blowout preventer, at least two throats are arranged in a center hole of the sealing rubber core, an upper convex ring is arranged at the upper end of the flange of the simple self-sealing blowout preventer, a centering ring is arranged in an inner cavity of the upper convex ring, adjusting screws are respectively screwed on four phases of the upper convex ring, and inner ends of the adjusting screws respectively abut against the outer wall of the centering ring.
12. The pressurized well repairing method for the low-pressure oil-water well is characterized by sequentially comprising the following steps of: step 1: preparation before work
Step 1.1: manufacturing a hexagonal grid platform and a sunken collecting box, welding a central cylinder at the center of the sunken collecting box, and respectively welding sleeves at two sides of the central cylinder;
step 1.2: the single ram blowout preventer, the double ram slip blowout preventer, the annular blowout preventer and the simple self-sealing blowout preventer are connected in advance from bottom to top in sequence to form a blowout preventer group;
step 2: installation pressurized workover device
Step 2.1: putting a blanking plug into an inner cavity of the oil pipe;
step 2.2: removing the part above a flange on the wellhead four-way, and installing a blowout preventer stack above the wellhead four-way;
step 2.3: sleeving a central cylinder of the sunken collecting box on the periphery of the annular blowout preventer, and supporting legs at the bottom of the sunken collecting box on the ground;
step 2.4: the method comprises the following steps that a lifting hydraulic cylinder penetrates through a sleeve of a sunken collecting box, the lower end of the lifting hydraulic cylinder is connected with a lower cross beam, two ends of the lower cross beam are supported on a left support and a right support which are fixed on a crosspiece of a supporting leg, the upper end of the lifting hydraulic cylinder is connected with an upper cross beam, and a movable slip is installed in a slip installing hole in the center of the upper cross beam;
and step 3: oil extraction pipe column
Step 3.1: lifting the oil pipe column by using a workover rig, lifting most of oil pipes, and discharging accumulated water of each oil pipe into a sunken collecting box;
step 3.2: when the self weight of the residual tubing string is not enough to overcome the jacking force generated by the underground pressure, the floating slips are adopted to clamp the tubing string;
step 3.3: lifting a piston rod of a lifting hydraulic cylinder upwards to lift a tubing string for a certain distance, then clamping a tubing string by a slip of the double-ram slip blowout preventer, loosening a traveling slip, retracting the piston rod of the lifting hydraulic cylinder, and moving an upper cross beam and the traveling slip downwards for a certain distance;
step 3.4: the floating slips clamp the oil pipe column again, the slips of the double-ram slip blowout preventer are loosened, then a piston rod of the lifting hydraulic cylinder is lifted upwards again, the rest oil pipes are lifted up one by one in this way, accumulated water of each oil pipe is discharged into the sunken collecting box, and then the single-ram blowout preventer is closed;
and 4, step 4: a new oil pipe column is put into the well;
and 5: and the decomposition blowout preventer stack is connected with the four-way upper flange of the wellhead, so that the whole pressurized workover rig is hoisted and transported.
13. The pressurized workover method for a low-pressure oil-water well according to claim 12, wherein the step 4 comprises the following substeps:
step 4.1: closing a bottom opening and closing tool of the new oil pipe column, and then opening the single ram blowout preventer;
step 4.2: clamping a new oil pipe column by adopting a traveling slip, then pulling down an upper cross beam by a lifting hydraulic cylinder to enable the new oil pipe column to descend for a certain distance, then clamping the new oil pipe column by a slip of a double-ram slip blowout preventer, then loosening the traveling slip, extending out a piston rod of the lifting hydraulic cylinder, and moving the upper cross beam and the traveling slip for a certain distance;
step 4.3: the traveling slips clamp the oil pipe column again, the slips of the double-ram slip blowout preventer are loosened, then the lifting hydraulic cylinder is pulled down again, and therefore a plurality of new oil pipes are put into the well;
step 4.4: when the dead weight of the new oil pipe column is enough to overcome the jacking force generated by the underground pressure, the moving slips are loosened, and the new oil pipe column is continuously lowered by adopting the workover rig until the whole new oil pipe column is lowered into the well.
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| CN112412380B (en) * | 2020-11-23 | 2022-07-19 | 大庆油田有限责任公司 | Oil field operation vehicle-mounted wellhead operation floating sealing platform |
| CN113250627A (en) * | 2021-06-29 | 2021-08-13 | 四川圣诺油气工程技术服务有限公司 | Oil pipe centering device for operation under pressure |
| CN113250627B (en) * | 2021-06-29 | 2021-09-10 | 四川圣诺油气工程技术服务有限公司 | Oil pipe centering device for operation under pressure |
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|---|---|
| CN111911095B (en) | 2022-02-11 |
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