CN113250642A

CN113250642A - Packer for well cementation

Info

Publication number: CN113250642A
Application number: CN202110570583.1A
Authority: CN
Inventors: 张梦
Original assignee: Individual
Current assignee: Shengli Oilfield Lifeng Thick Oil Technology Development Co ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-08-13
Anticipated expiration: 2041-05-25
Also published as: CN113250642B

Abstract

The invention relates to the technical field of oil exploitation equipment, and discloses a packer for well cementation, which comprises an oil well. This packer for well cementation, install through packing element symmetry about the pressure retaining valve, make equipment after carrying out the backwash, at the top pump income pressure of placing the 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 begins to move, the slips of below supports on the extrusion, and the packing element inflation is supported, block up the oil well, rotatory pipe of placing breaks away from with the sleeve pipe in the pressure retaining process, piston return under the spring action of spring, the rotor blade stretches out the inner chamber that gets into the sleeve pipe this moment, oil is pumped from the direction of following upwards, striking rotor blade drives the piston rotation, under the semiellipse structure effect of piston, when the rotatory vertical downwards in bulge, the packing element inflation of below supports closely, the pull rod of upper portion can move down the movable sleeve that stimulates the top at this moment and move, make the packing element of top have the effect of relaxing.

Description

Packer for well cementation

Technical Field

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

Background

The packer is provided with an elastic sealing element, so that annular spaces between pipe columns with various sizes and well bores and between the pipe columns are sealed, a production layer is isolated, so that production fluid is controlled, and downhole tools of pipe sleeves are protected.

The packer is formed by locking a sealing element and a slip by a locking mechanism to increase the sealing performance, an anchoring mechanism overcomes the upward jacking force of a pipe column to fix and limit the packer, the sealing mechanism is used for sealing an annular space of an oil sleeve, the packer is connected with an upper pipe and is lowered to a designed depth, a water injection backwashing well is put into the oil sleeve, a steel ball with a calibrated specification is put into the oil sleeve, a pump truck starts to press the steel ball, the pressure of the upper part of the steel ball is increased, a piston, a sliding sleeve, a locking ring and a slip cone are pushed to move downwards, the slip is fixed on the sleeve, other components continue to move downwards, the sealing element is expanded, the space of the oil sleeve is sealed, the pressure of an oil pipe is removed, the pipe column is rotated and lifted up to finish releasing, when sealing is not needed, a fishing tool is put into the oil sleeve, the packer is fixed with threads and then lifted up, a locker is moved upwards, the sealing element returns, the slip cone moves upwards, the slip is loosened to finish releasing.

Current packer is in the use, when carrying out the effect of layering, the pressure at both ends is uneven about the packer, and under long-time work is sealed, and work load is too high, very easily leads to the packing element on the packer to take place to warp to lead to unable completion deblocking action, current equipment is when the deblocking simultaneously, is through the lifting rod screw thread installation, breaks apart the promotion with the shear pin, under the great condition of holding power, and the easy-to-tear of screw thread leads to the problem of unable deblocking.

Disclosure of Invention

The invention provides a well cementing packer which has the advantages that a rubber cylinder is not easy to extrude and damage, and deblocking with larger pulling force is not needed, and the packer solves the problems that the work load is high, the rubber cylinder is easy to deform and damage, the needed pulling force is large, threads are easy to damage, and deblocking is not easy.

The invention provides the following technical scheme: the utility model provides a packer for well cementation, includes the oil well, the pressure retaining valve has been transferred to the inside specified position of oil well, the fixed internal surface cover of pressure retaining valve upper part is equipped with the sleeve pipe, the sleeve pipe is in the internal surface symmetry installation of pressure retaining valve, and lower part the sheathed tube upper part screw thread cover is equipped with places the pipe, it upwards stretches out to place the pipe, the movable sleeve of upper part of pressure retaining valve is equipped with movable sleeve one, the last fixed surface of movable sleeve one installs the packing element, the last fixed surface of packing element installs movable sleeve two, the last surface contact of movable sleeve two slides and has the slips, the last surface contact of slips has the taper sleeve, movable sleeve two is equipped with the tile sleeve with the surface cover of tile sleeve, the tile sleeve is spacing to the slips, the taper sleeve is that the fixed cover of upper part is equipped with fixed cover, fixed cover has placed taper sleeve and sleeve pipe fixed mounting, place the bottom ball valve of pipe, the middle part movable mounting of pressure retaining valve has the piston, the one end fixed mounting of piston has the spring, the runner has been seted up to the other end of spring, the middle part fixed mounting of the piston other end has the commentaries on classics leaf, the lower partial movable sleeve of movable sleeve one is equipped with the pull rod, the outer lane movable sleeve of piston is equipped with the loop, the pull rod slides the suit at the surface of loop.

As preferred, in the deblocking stage the sleeve pipe cooperation cover is equipped with the lifter, the outer surface movable sleeve of lifter lower part is equipped with and compresses tightly the cover, the last fixed surface who compresses tightly the cover installs the gasbag, the surface of lifter and with the fixed cover of gasbag cooperation are equipped with put the pressure cover, the both sides movable sleeve of putting the pressure cover is equipped with the push rod, the internal surface fixed mounting who puts the pressure cover has sealed the pad.

Preferably, the push rod aligns the piston when the nesting height on the lift rod is in mating contact with the stepped threaded bores of the lift rod and the sleeve.

Preferably, the piston is of a half-elliptical structure which is arranged in an up-and-down symmetrical mode.

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

The invention has the following beneficial effects:

1. the packer for well cementation is symmetrically installed above and below a pressure retaining valve through a rubber sleeve, after equipment is subjected to backwashing, pressure is pumped into the top of a placing pipe, water pressure is continuously increased to push a piston to move, a sliding cavity in the pressure retaining valve is pressurized, a movable sleeve starts to move to extrude slips supports above and below and rubber sleeve expansion supports to block an oil well, the placing pipe rotates in the pressurizing process to be separated from a sleeve, the piston returns under the elastic force of a spring, at the moment, a rotating vane extends into an inner cavity of the sleeve, oil is pumped out from the lower direction and impacts the rotating vane to drive the piston to rotate, under the action of a semi-elliptical structure of the piston, when a protruding part rotates vertically downwards, the rubber sleeve expansion supports below are tight, at the moment, a pull rod at the upper part can move downwards to pull the movable sleeve above to move downwards, and the rubber sleeve above has a loosening effect, under the rotation of piston, the packing element of symmetry installation loosens in turn, and can guarantee that the oil well is sealed layering always, has guaranteed that the packing element can not lead to its deformation under the last differential pressure effect always, and during follow-up deblocking, unable return deblocking has guaranteed that the life of packing element and the follow-up work of equipment are smooth.

2. This packer for well cementation, set up through the lifting bar structure, make compress tightly cover and sheathed tube shoulder hole cooperation back, it stretches out to push away the push rod in putting the cover with gasbag compression control injection, the lifting bar continues to move down and contacts with sheathed tube shoulder hole, push rod and rotary vane cooperation this moment, the lifting bar is rotatory to continue to move down with sleeve pipe screw-thread fit, it removes under the thrust effect that supports of compressing tightly the cover between cover and the lifting bar this moment to put, guarantee that the push rod aims at the rotary vane all the time, the gasbag compression pressure boost of upper portion promotes the rotary vane and removes, with runner and the cooperation of pressure retaining valve hole, carry out the pressure release, the automatic return that relaxes of packing element, no longer seal, it is spacing to make equipment need not shear the round pin, need cut when the deblocking, required pulling force is great, guarantee to know to seal and carry and to need not 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 view of the structure at A in FIG. 1 according to the present invention;

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

FIG. 4 is a schematic view of the movement structure of the pressing sleeve on the lifting rod of the present invention;

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

FIG. 6 is a side view of the piston of the present invention.

In the figure: 1. an oil well; 2. a pressure retaining valve; 3. a sleeve; 4. placing a tube; 5. a first movable sleeve; 6. a rubber cylinder; 7. a second movable sleeve; 8. slips; 9. a taper sleeve; 10. sleeving a tile; 11. fixing a sleeve; 12. a ball valve; 13. a piston; 14. a spring; 15. a flow channel; 16. rotating the leaves; 17. a pull rod; 18. looping; 19. a lifting bar; 20. a compression sleeve; 21. an air bag; 22. releasing the pressing sleeve; 23. a push rod; 24. and a gasket.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, a packer for well cementation comprises an oil well 1, a pressure retaining 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 retaining valve 2, the sleeve 3 is symmetrically installed on the inner surface of the pressure retaining valve 2, a placing pipe 4 is sleeved on the upper part of the lower part of the sleeve 3 in a threaded manner, the placing pipe 4 extends upwards, a movable sleeve 5 is movably sleeved on the upper part of the pressure retaining valve 2, a rubber sleeve 6 is fixedly installed on the upper surface of the movable sleeve 5, a movable sleeve 7 is fixedly installed on the upper surface of the rubber sleeve 6, a slip 8 slides in contact with the upper surface of the movable sleeve 7, a taper sleeve 9 is in contact with the upper surface of the slip 8, a slip sleeve 10 is sleeved on the outer surfaces of the movable sleeve 7 and the slip sleeve 10, the slip 8 is limited by the slip sleeve 10, 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 placed at the bottom of the placing pipe 4, a piston 13 is movably installed in the middle of the pressure retaining valve 2, a spring 14 is fixedly installed at one end of the piston 13, a flow channel 15 is formed in the other end of the spring 14, a rotating blade 16 is fixedly installed in the middle of the other end of the piston 13, a pull rod 17 is movably sleeved on the lower portion of a movable sleeve 5, a movable sleeve 18 is movably sleeved on 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 semi-elliptical structure which is symmetrically arranged up and down, the movable sleeves 5 are symmetrically arranged up and down through the pressure retaining valve 2, the movable sleeves 5 are connected with the piston 13 through the pull rod 17, so that the ball valve 12 is placed after the equipment is reversely placed, pressure is pumped into the top of the placing pipe 4, water pressure is continuously increased, the piston 13 can be pushed to move, a sliding cavity in the pressure retaining valve 2 is pressurized, the movable sleeves 5 start to move, the slips 8 which are pressed up and down to support, and a rubber cylinder 6 is expanded and supported, the oil well 1 is sealed, the rotary placing pipe 4 is separated from the casing 3 in the pressure maintaining process, after the hole on the placing pipe 4 is dislocated with the flow passage 15, the piston 13 returns under the elastic force of the spring 14, at the moment, the rotating blade 16 extends into the inner cavity of the casing 3, the oil is pumped out from the lower direction, the impact rotating blade 16 drives the piston 13 to rotate, under the action of the semi-elliptical structure of the piston 13, when the protruding part rotates vertically downwards, the rubber cylinder 6 at the lower part is expanded and supported tightly, at the moment, the pull rod 17 at the upper part moves downwards to pull the movable sleeve I5 at the upper part to move downwards, so that the rubber cylinder 6 at the upper part has the loosening function, under the rotation of the piston 13, the rubber cylinders 6 which are symmetrically installed are alternately loosened, the oil well 1 can be ensured to be always sealed and layered, the rubber cylinder 6 can not be deformed under the action of the pressure difference between the upper part and the lower part all the time, when the rubber cylinder is subsequently unsealed, the rubber cylinder 6 cannot be reset and deblocked, the service life of the rubber cylinder 6 and the subsequent work of the device are ensured to be smooth, a lifting rod 19 is sleeved on the sleeve 3 in a matched mode in a deblocking stage, 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 releasing 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 releasing sleeve 22, a sealing gasket 24 is fixedly installed on the inner surface of the pressure releasing sleeve 22, the push rods 23 are aligned to the piston 13 when the sleeving height of the lifting rod 19 on the lifting rod 19 is matched and contacted with the stepped threaded holes of the lifting rod 19 and the sleeve 3, after the pressing 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 pressure releasing sleeve 22 to push the push rods 23 to extend out, the lifting rod 19 continues to move downwards to be contacted with the stepped holes of the sleeve 3, at the push rods 23 are matched with the rotating vanes 16 at the moment, the lifting rod 19 and continue to move downwards in a threaded fit with the sleeve 3, at this moment, the pressure release sleeve 22 and the lifting rod 19 move under the action of pushing force of the pressure release sleeve 20, the push rod 23 is guaranteed to be always aligned to the rotary vane 16, the air bag 21 at the upper part is compressed and pressurized to push the rotary vane 16 to move, the flow passage 15 is matched with the inner hole of the pressure maintaining valve 2 to release pressure, the rubber sleeve 6 automatically releases and returns, sealing is not carried out, the equipment does not need to be limited by shearing pins, the equipment needs to be sheared when being unsealed, the required pulling force is large, the situation that the large pulling force is not needed when the equipment is pulled and pulled in a sealing mode is guaranteed, and the equipment can be reused.

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 retaining valve 2, the whole structure of the rubber cylinder is placed 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 placed to block the bottom of the 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 retaining valve 2, the movable sleeve I5 is pushed to slide, the slips 8 is driven to extend out of the support, the rubber cylinder 6 is extruded to expand and seal, the rotary placing pipe 4 is separated, the piston 13 returns under the action of the spring 14, the rotary vane 16 extends out of the inner cavity of the sleeve 3, oil is pumped out from the lower direction, the rotary vane 16 is impacted to drive the piston 13 to rotate, under the action of the semi-elliptical structure of the piston 13, when the protruding part rotates vertically downwards, the expansion support of the rubber cylinder 6 at the lower part is tight, and at the moment, the upper part of the pull rod 17 can move downwards to pull the movable sleeve I5 to move downwards, the rubber cylinder 6 above the rubber cylinder has the function of loosening, under the rotation of the piston 13, the rubber cylinders 6 which are symmetrically installed alternately loosen and expand for sealing, when the rubber cylinder is unsealed, the lifting rod 19 extends 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 decompression sleeve 22 to push the push rod 23 to stretch out, the lifting rod 19 continuously moves downwards to be contacted with the stepped hole of the sleeve 3, at the moment, the push rod 23 is matched with the rotary vane 16, the lifting rod 19 rotates to be matched with the thread of the sleeve 3 to continuously move downwards, at the moment, the decompression sleeve 22 and the lifting rod 19 move under the action of the pushing force of the compression sleeve 20, the push rod 23 is ensured to be 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 flow passage 15 is matched with the inner hole of the pressure maintaining valve 2 to release pressure, and the rubber cylinder 6 automatically loosens and returns without sealing.

It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments 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 cementing comprising an oil well (1), characterized in that: the pressure retaining valve (2) is placed at a specified position inside the oil well (1), the sleeve (3) is sleeved on the upper portion of the pressure retaining valve (2) in a fixed surface mode, the sleeve (3) is symmetrically installed on the inner surface of the pressure retaining valve (2), the lower portion of the sleeve (3) is sleeved with the placement pipe (4) in a threaded mode, the placement pipe (4) extends upwards, the movable sleeve (5) is sleeved on the upper portion of the pressure retaining valve (2) in a movable mode, the rubber sleeve (6) is installed on the upper surface of the movable sleeve (5) in a fixed mode, the movable sleeve (7) is installed on the upper surface of the rubber sleeve (6) in a fixed mode, the slips (8) are arranged on the upper surface of the movable sleeve (7) in a sliding mode, the taper sleeve (9) is arranged on the upper surface of the slips (8) in a contact mode, the movable sleeve (7) is sleeved with the tile sleeve (10) in an outer surface mode, tile sleeve (10) are spacing to slips (8), taper sleeve (9) are that the fixed cover of upper portion is equipped with fixed cover (11), fixed cover (11) have taper sleeve (9) and sleeve pipe (3) fixed mounting, place the bottom of pipe (4) and placed ball valve (12), the middle part movable mounting of pressure retaining valve (2) has piston (13), the one end fixed mounting of piston (13) has spring (14), runner (15) have been seted up to the other end of spring (14), the middle part fixed mounting of the piston (13) other end has commentaries on classics leaf (16), the lower part movable sleeve of a movable sleeve (5) is equipped with pull rod (17), the outer lane movable sleeve of piston (13) is equipped with loop (18), pull rod (17) are at the surface slip suit of loop (18).

2. A packer for cementing according to claim 1, characterized in that: at the deblocking stage sleeve pipe (3) cooperation cover is equipped with lifting rod (19), the surface movable sleeve of lifting rod (19) lower part is equipped with and compresses tightly cover (20), the last fixed surface who compresses tightly cover (20) installs gasbag (21), the surface of lifting rod (19) and with the fixed cover of gasbag (21) cooperation are equipped with puts and press cover (22), the both sides movable sleeve that puts and press cover (22) is equipped with push rod (23), the internal fixed surface who puts and press cover (22) installs sealed pad (24).

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

4. A packer for cementing according to claim 1, characterized in that: the piston (13) is of a half elliptic structure which is symmetrically arranged up and down.

5. A packer for cementing according to claim 1, characterized in that: the rubber cylinder (6) and the clamping mechanism thereof are symmetrically arranged below the pressure retaining valve (2).