CN113250642B

CN113250642B - Packer for well cementation

Info

Publication number: CN113250642B
Application number: CN202110570583.1A
Authority: CN
Inventors: 张梦
Original assignee: Shengli Oilfield Lifeng Thick Oil Technology Development Co ltd
Current assignee: Shengli Oilfield Lifeng Thick Oil Technology Development Co ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2023-05-12
Anticipated expiration: 2041-05-25
Also published as: CN113250642A

Abstract

The invention relates to the technical field of petroleum exploitation equipment, and discloses a packer for well cementation, which comprises an oil well. This packer for well cementation is installed through packing element upper and lower symmetry in the pressurize valve for equipment is backwash back, at the top pump pressure of placing the pipe, water pressure constantly increases, can promote the piston and remove, to the slip chamber pressure boost in the pressurize valve, the movable sleeve begins to remove, the slip support of upper and lower side is extruded, and the packing element inflation supports, it is plugged with the oil well, rotatory placing pipe and sleeve pipe break away from in the pressure retention process, the piston return under the elasticity effect of spring, the inner chamber of entering sleeve is stretched out to the rotor at this moment, the oil is pumped from the lower direction, the striking rotor drives the piston rotation, under the semi-elliptic structure effect of piston, when the bulge rotatory vertical decurrent time, the packing element inflation support of below is inseparable, the pull rod of upper portion can move down and pull the movable sleeve of top down, make the packing element of top have the effect of loosening.

Description

Packer for well cementation

Technical Field

The invention relates to the technical field of petroleum exploitation equipment, in particular to a packer for well cementation.

Background

The packer is a downhole tool with an elastic sealing element, thereby sealing annular spaces between various size tubular columns and a well bore and between tubular columns, isolating a production layer, controlling production fluid and protecting a pipe sleeve, and can be widely applied to drilling, well cementation, testing, well completion and other operations, and can also be applied to downhole petroleum operations.

The packer is locked by a locking mechanism, sealing performance is improved, an anchoring mechanism overcomes the upward pushing force of a pipe column, the packer is fixed and limited, the sealing mechanism is used for sealing an annular space of an oil sleeve, connecting the packer with an upper pipe, lowering the packer to a designed depth, injecting water into a back flushing well, putting into a steel ball with calibrated specification, starting to press by a pump truck, increasing the pressure on the upper part of the steel ball, pushing a piston, a sliding sleeve, a locking ring and a slip cone to move downwards, fixing the slip on a sleeve, continuing to move downwards by other components, expanding the sealing element, sealing the oil sleeve space, removing the pressure of an oil pipe, rotating the pipe column, lifting up after the pipe column is completed, and when sealing is not needed, lowering a fishing tool, lifting up after the pipe column is fixed with the thread of the packer, lifting up the locker, returning the sealing element, lifting the slip cone, releasing the slip, and completing deblocking.

In the use of the existing packer, when layering is performed, the pressures at the upper end and the lower end of the packer are uneven, under long-time working sealing, the working load is too high, and the packing element on the packer is extremely easy to deform, so that the unpacking action cannot be completed, meanwhile, when the existing equipment is unpacked, the shearing pin is broken and lifted through the threaded installation of the lifting rod, and under the condition of large supporting force, the threads are easy to break, so that the problem that the unpacking cannot be performed is solved.

Disclosure of Invention

The invention provides a packer for well cementation, which has the advantages that a rubber cylinder is not easy to squeeze and damage, and does not need a large pulling force to unseal simply, and solves the problems that the working load is high, the rubber cylinder is easy to deform and damage, the required pulling force is large, threads are easy to break, and the sealing is not easy to unseal.

The invention provides the following technical scheme: the utility model provides a well cementation is with packer, includes the oil well, the inside regulation position of oil well has the pressurize valve down, the fixed cover of internal surface of pressurize valve upper portion is equipped with the sleeve pipe, the sleeve pipe is at the internal surface symmetry installation of pressurize valve, the lower part the sheathed tube upper portion screw thread cover is equipped with places the pipe, place the pipe and upwards stretch out, the upper portion movable cover of pressurize valve is equipped with movable cover one, the fixed mounting of upper surface of movable cover one has the packing element, the fixed mounting of upper surface of packing element has movable cover two, the upper surface contact slip of movable cover two has slips, the upper surface contact of slips has the taper sleeve, movable cover two and the surface cover of bush are equipped with the bush, the bush is spacing to slips, the taper sleeve is upper portion fixed cover and is equipped with the fixed cover, fixed cover and sleeve pipe fixed mounting, the ball valve has been placed to the bottom of placing the pipe, the middle part movable mounting of pressurize valve has the piston, the one end fixed mounting spring, the runner has been seted up to the other end of spring, the fixed mounting of piston other end has the taper sleeve, the fixed mounting of movable cover has the taper sleeve one, the movable sleeve has the movable sleeve at the outer lane.

Preferably, in the deblocking stage, the sleeve is matched with a lifting rod, the outer surface of the lower part of the lifting rod is movably sleeved with a pressing sleeve, the upper surface of the pressing sleeve is fixedly provided with an air bag, the outer surface of the lifting rod is matched with and fixedly sleeved with a pressure release sleeve, two sides of the pressure release sleeve are movably sleeved with push rods, and the inner surface of the pressure release sleeve is fixedly provided with a sealing gasket.

Preferably, the push rod is aligned with the piston when the sleeved height of the push rod on the lifting rod is in matched contact with the stepped threaded holes of the lifting rod and the sleeve.

Preferably, the piston has a half elliptic structure which is arranged symmetrically up and down.

Preferably, the rubber cylinder and the clamping mechanism thereof are symmetrically arranged below the pressure maintaining valve.

The invention has the following beneficial effects:

1. this packer for well cementation is installed through packing element upper and lower symmetry for equipment is backwash back, top pump pressure at the place pipe, water pressure constantly increases, can promote the piston and remove, to the slip chamber pressure boost in the pressure retaining valve, the movable sleeve initially removes, the slip support of extrusion upper and lower, and packing element inflation support, with oil well shutoff, rotatory place pipe and the sleeve pipe break away from in the pressure retention process, the piston return under the elasticity effect of spring, the rotor blade stretches out the inner chamber that gets into the sleeve pipe this moment, the oil is pumped from the lower direction, the striking rotor blade drives the piston rotation, under the semi-elliptic structure effect of piston, when the bulge rotatory vertical decurrent, the packing element inflation support of below is inseparable, the pull rod of upper portion can move down and pull the movable sleeve of top down at this moment, make the packing element of top have the effect of relaxing, under the rotation of piston, and the packing element of symmetrical installation is the sealing layering always can be guaranteed, the packing element can not lead to its deformation under the effect of upper and lower pressure difference always, follow-up deblocking is guaranteed, service life of the packing element and equipment has been guaranteed to be smooth when the follow-up deblocking.

2. This packer for well cementation is through lifting rod structure setting for after compressing tightly cover and sheathed tube shoulder hole cooperation, with gasbag compression control injection pressure release cover in promoting the push rod and stretch out, the lifting rod continues to move down and sheathed tube shoulder hole contact, push rod and rotating vane cooperation this moment, lifting rod rotation and sleeve screw thread cooperation continue to move down, at this moment between pressure release cover and the lifting rod under compressing tightly the thrust effect of cover and remove, guarantee that the push rod is aimed at the rotating vane all the time, the gasbag compression pressurization of upper portion promotes rotating vane and removes, with runner and pressurize valve hole cooperation, carry out the pressure release, the packing element is automatic to relax the return, no longer seal and separate, make equipment need not cut the round pin spacing, need cut when deblocking, required pulling force is great, guarantee to know Feng Di and pull not need very big pulling force, and equipment reuse.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is an enlarged schematic view of the structure of FIG. 1A according to the present invention;

FIG. 3 is a schematic cross-sectional view of a lift rod of the present invention;

FIG. 4 is a schematic diagram of the motion structure of the upper press jacket of the lifting rod of the present invention;

FIG. 5 is an enlarged schematic view of the structure of FIG. 4B according to the present invention;

fig. 6 is a schematic side view of the piston of the present invention.

In the figure: 1. oil well; 2. a pressure maintaining valve; 3. a sleeve; 4. placing a tube; 5. a movable sleeve I; 6. a rubber cylinder; 7. a movable sleeve II; 8. a slip; 9. a taper sleeve; 10. a tile sleeve; 11. a fixed sleeve; 12. a ball valve; 13. a piston; 14. a spring; 15. a flow passage; 16. rotating leaves; 17. a pull rod; 18. a loop; 19. a lifting rod; 20. a compacting sleeve; 21. an air bag; 22. a pressure release sleeve; 23. a push rod; 24. and a sealing gasket.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-6, a packer for well cementation comprises an oil well 1, a pressure maintaining valve 2 is placed at a specified position in the oil well 1, a sleeve 3 is fixedly sleeved on the inner surface of the upper part of the pressure maintaining valve 2, the sleeve 3 is symmetrically arranged on the inner surface of the pressure maintaining valve 2, a placing pipe 4 is sleeved on the upper part of the lower sleeve 3 in a threaded manner, the placing pipe 4 stretches upwards, a movable sleeve I5 is movably sleeved on the upper part of the pressure maintaining valve 2, a rubber cylinder 6 is fixedly arranged on the upper surface of the movable sleeve I5, a movable sleeve II 7 is fixedly arranged on the upper surface of the rubber cylinder 6, a slip 8 is in contact sliding with the upper surface of the movable sleeve II 7, a taper sleeve 9 is in contact with the upper surface of the slip 8, a tile sleeve 10 is sleeved on the outer surface of the movable sleeve II and the tile sleeve 10, the tile sleeve 10 limits the slip 8, a fixed sleeve 11 is fixedly sleeved on the upper part of the taper sleeve 9, the fixed sleeve 11 fixedly installs the taper sleeve 9 and the sleeve 3, the ball valve 12 is arranged at the bottom of the placing pipe 4, the piston 13 is movably arranged at the middle part of the pressure maintaining valve 2, the spring 14 is fixedly arranged at one end of the piston 13, the flow channel 15 is arranged at the other end of the spring 14, the rotating vane 16 is fixedly arranged at the middle part of the other end of the piston 13, the pull rod 17 is movably sleeved at the lower part of the movable sleeve I5, the movable sleeve 18 is movably sleeved at the outer ring of the piston 13, the pull rod 17 is slidably sleeved on the outer surface of the movable sleeve 18, the piston 13 is of a half elliptic structure which is vertically symmetrically arranged, the movable sleeve I5 which is symmetrically arranged at the upper part and the lower part of the pressure maintaining valve 2 is connected with the piston 13 through the pull rod 17, so that after the equipment is backwashed, the ball valve 12 is placed at the top of the placing pipe 4, the water pressure is continuously increased, the piston 13 can be pushed to be boosted, the sliding cavity in the pressure maintaining valve 2 is started to move, the upper and lower slips 8 are pressed to support, and the rubber cylinder 6 is expanded to support the oil well 1, the rotary placing pipe 4 is separated from the sleeve 3 in the pressure keeping process, after the holes on the placing pipe 4 are misplaced with the flow channels 15, the piston 13 returns under the elastic force of the springs 14, at the moment, the rotary blades 16 extend out into the inner cavity of the sleeve 3, petroleum is pumped out from the lower direction, the rotary blades 16 are impacted to drive the piston 13 to rotate, under the semi-elliptic structure of the piston 13, when the protruding part rotates vertically downwards, the lower rubber cylinder 6 is expanded to support tightly, at the moment, the pull rod 17 at the upper part moves downwards to pull the upper movable sleeve 5 to move downwards, so that the upper rubber cylinder 6 has a loosening effect, the symmetrically installed rubber cylinders 6 are alternately loosened under the rotation of the piston 13, the oil well 1 can be guaranteed to be sealed and layered all the time, the rubber cylinder 6 can not be deformed under the action of up-down pressure difference always, during the subsequent deblocking, the deblocking can not be returned, the service life of the rubber cylinder 6 and the subsequent operation of the equipment are ensured, the lifting rod 19 is sleeved on the sleeve 3 in a matched manner in the deblocking stage, the compression sleeve 20 is movably sleeved on the outer surface of the lower part of the lifting rod 19, the air bag 21 is fixedly arranged on the upper surface of the compression sleeve 20, the push rod 23 is movably sleeved on the outer surface of the lifting rod 19 and fixedly sleeved on the two sides of the compression sleeve 22 in a matched manner with the air bag 21, the sealing gasket 24 is fixedly arranged on the inner surface of the compression sleeve 22, the push rod 23 is aligned with the piston 13 when the sleeved height of the lifting rod 19 is matched with the stepped threaded holes of the lifting rod 19 and the sleeve 3, so that after the compression sleeve 20 is matched with the stepped holes of the sleeve 3, the air bag 21 is compressed and controlled to be injected into the compression sleeve 22 to push the push rod 23 to extend, the lifting rod 19 is continuously moved downwards to contact with the stepped holes of the sleeve 3, at this time, the push rod 23 is matched with the rotary vane 16, the lifting rod 19 rotates to be matched with the sleeve 3 in a threaded manner to continuously move downwards, at this time, the pressure release sleeve 22 and the lifting rod 19 move under the action of the pushing force of the pressing sleeve 20, the push rod 23 is always aligned with the rotary vane 16, the air bag 21 at the upper part compresses and pressurizes to push the rotary vane 16 to move, the runner 15 is matched with the inner hole of the pressure maintaining valve 2 to release pressure, the rubber cylinder 6 automatically relaxs and returns, sealing is not carried out, the equipment does not need to be limited by a shearing pin, shearing is needed during unsealing, the needed pulling force is large, the fact that Feng Di pulling does not need to be very large pulling force is guaranteed, and the equipment can be reused is ensured.

The working principle of the packer of the invention is as follows:

the rubber cylinder 6, the slips 8 and the clamping structure thereof are symmetrically arranged below the pressure maintaining valve 2, the whole structure is put into a specified position in the oil well 1 through the placing pipe 4, water is injected into the oil well 1 for backwashing, the ball valve 12 is put into the bottom of the plugging placing pipe 4, a pump is added to the top of the placing pipe 4, the water pressure in the placing pipe 4 is continuously increased, the piston 13 is pushed to move, the pressure in the processing placing pipe 4 is conveyed into the pressure maintaining valve 2, the movable sleeve 5 is pushed to slide, the slips 8 are driven to extend out to support, the rubber cylinder 6 is extruded for expansion and sealing, the rotating placing pipe 4 is separated, the piston 13 returns under the action of the spring 14, the rotating vane 16 extends out into the inner cavity of the sleeve 3, petroleum is pumped out from the lower direction, the impact rotating vane 16 drives the piston 13 to rotate, the rubber cylinder 6 below is expanded to tightly supported when the protruding part rotates vertically downwards under the action of the semi-elliptic structure of the piston 13, at this time, the pull rod 17 at the upper part moves downwards to pull the movable sleeve 5 at the upper part to move downwards, so that the rubber cylinder 6 at the upper part has a loosening effect, under the rotation of the piston 13, the symmetrically installed rubber cylinder 6 alternately loosens and expands and seals, when in deblocking, the lifting rod 19 is penetrated into the sleeve 3, after the compression sleeve 20 is matched with the stepped hole of the sleeve 3, the air bag 21 is compressed and controlled to be injected into the compression sleeve 22 to push the push rod 23 to stretch out, the lifting rod 19 moves downwards to be contacted with the stepped hole of the sleeve 3, at this time, the push rod 23 is matched with the rotating blade 16, the lifting rod 19 rotates to move downwards to be matched with the sleeve 3 by the screw thread, at this time, the push rod 23 always aligns with the rotating blade 16 under the pushing force of the compression sleeve 20, the air bag 21 at the upper part compresses and pressurizes and pushes the rotating blade 16 to move, the runner 15 is matched with the inner hole of the pressure maintaining valve 2 to release pressure, the rubber cylinder 6 automatically loosens and returns, no longer sealed.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A packer for well cementation, comprising an oil well (1), characterized in that: the pressure maintaining valve (2) is arranged at a specified position inside the oil well (1), the sleeve (3) is sleeved on the inner surface of the upper part of the pressure maintaining valve (2) in a fixed manner, the sleeve (3) is symmetrically arranged on the inner surface of the pressure maintaining valve (2), the lower part of the sleeve is sleeved with the placing pipe (4) in a threaded manner, the placing pipe (4) stretches out upwards, the upper part of the pressure maintaining valve (2) is movably sleeved with the first movable sleeve (5), the rubber sleeve (6) is fixedly arranged on the upper surface of the first movable sleeve (5), the second movable sleeve (7) is fixedly arranged on the upper surface of the rubber sleeve (6), the slips (8) are in contact sliding connection with the upper surface of the second movable sleeve (7), the slips (9) are sleeved with the outer surface of the second movable sleeve (7), the slips (10) are limited, the first movable sleeve (9) is fixedly sleeved with the first movable sleeve (5), the upper part of the movable sleeve (11) is fixedly sleeved with the second movable sleeve, the movable sleeve (7) is fixedly arranged on the outer surface of the second movable sleeve (9), the movable sleeve (9) is fixedly arranged on the outer surface of the first movable sleeve (9), the movable sleeve (9) is fixedly arranged on the outer sleeve (9), one end of the ball valve (13) is fixedly arranged on the ball valve (3) and fixedly arranged on the ball valve (13), a runner (15) is arranged at the other end of the spring (14), a rotary vane (16) is fixedly arranged in the middle of the other end of the piston (13), a pull rod (17) is movably sleeved at the lower part of the movable sleeve I (5), a loop (18) is movably sleeved at the outer ring of the piston (13), and the pull rod (17) is slidably sleeved on the outer surface of the loop (18);

the piston (13) is a half ellipse structure that upper and lower symmetry set up, through the movable sleeve one (5) of the upper and lower symmetry of pressurize valve (2), and movable sleeve one (5) are connected with piston (13) through pull rod (17), make equipment put into ball valve (12) after carrying out the backwash, put into the top pump pressure of pipe (4), promote piston (13) removal, the sliding chamber pressure boost in pressurize valve (2), movable sleeve one (5) begins to remove, slip (8) support of upper and lower, and rubber tube (6) inflation support, with oil well (1) shutoff, place pipe (4) and sleeve pipe (3) in rotation in the pressure retention process, place hole and runner (15) dislocation back on pipe (4) under the elasticity effect of spring (14), piston (13) return, rotating vane (16) stretch out the inner chamber that gets into sleeve pipe (3) this moment, oil pumps from the lower direction, striking rotating vane (16) drive piston (13) rotation, under the semi-ellipse structure of piston (13) and the inflation support, when the rotation of piston (6) is rotated down, the piston (6) is rotated down, install the tight part under the rotation of pull rod (6) under the rotation of the piston (6), the tight part of rotation of the piston (6) is moved down in the rotation of the lower side of the sleeve (5) when the piston (6) is moved down.

2. The packer for well cementation of claim 1, wherein: in the deblocking stage, a lifting rod (19) is sleeved on the sleeve (3) in a matched mode, a pressing sleeve (20) is movably sleeved on the outer surface of the lower portion of the lifting rod (19), an air bag (21) is fixedly installed on the upper surface of the pressing sleeve (20), a pressure release sleeve (22) is fixedly sleeved on the outer surface of the lifting rod (19) and matched with the air bag (21), push rods (23) are movably sleeved on two sides of the pressure release sleeve (22), and a sealing gasket (24) is fixedly installed on the inner surface of the pressure release sleeve (22).

3. A packer for well cementation according to claim 2, wherein: the push rod (23) is aligned with the piston (13) when the sleeving height on the lifting rod (19) is in matched contact with the stepped threaded holes of the lifting rod (19) and the sleeve (3).

4. The packer for well cementation of claim 1, wherein: the rubber cylinder (6) and the clamping mechanism thereof are symmetrically arranged below the pressure maintaining valve (2).