CN212671683U

CN212671683U - Packer (CN)

Info

Publication number: CN212671683U
Application number: CN202020209865.XU
Authority: CN
Inventors: 肖国华; 王玲玲; 王芳; 邱贻旺; 陈雷; 吴双亮; 殷彩霞
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-02-25
Filing date: 2020-02-25
Publication date: 2021-03-09
Anticipated expiration: 2030-02-25

Abstract

The utility model discloses a packer belongs to the oil machinery field. In the packer, the first deblocking assembly comprises a shear ring and a shear ring sleeve; the upper joint is connected with the upper central pipe, the outer sleeve is sleeved outside the upper central pipe, the outer sleeve is connected with one end of the outer sleeve through a shearing ring sleeve, the shearing ring is embedded into the outer wall of the central pipe and protrudes out of the outer wall of the central pipe, the inner wall of the shearing ring sleeve is provided with a step structure, and the step structure abuts against one surface of the shearing ring, which is far away from the upper joint; the other end of the outer sleeve is connected with a first rubber cylinder seat, the first rubber cylinder seat is connected with one end of an outer central tube, and the outer central tube is positioned between the outer sleeve and the upper central tube; the second deblocking subassembly includes stay tube and deblocking pin, and the stay tube cover is outside last center tube, and fixed with last center tube through the deblocking pin, and the one end of stay tube is supported and is being cut the one end that the loop casing kept away from the top connection. The problem of play the operation process damage rate of packer higher among the correlation technique is solved, the effect of reducing the packer damage rate has been reached.

Description

Packer (CN)

Technical Field

The utility model relates to the field of petroleum machinery, in particular to packer.

Background

The water injection well is a well which can inject water into an oil layer in the process of oil field exploitation, and can keep or recover the pressure of the oil layer by injecting water into different oil layers, so that the oil reservoir has stronger driving force, thereby increasing the recovery ratio of the oil well. The packer can seal each oil layer, makes a water injection well can be to the water injection of different oil layers. One end of the packer is connected with the bottom of an oil pipe in the well, the other end of the packer is connected with the next packer or the next oil pipe, and layered sealing is achieved by setting the packer.

A packer of the related art comprises an upper joint assembly, a lower joint assembly, an upper central pipe and a setting assembly, wherein the upper joint assembly is connected with one end of the upper central pipe, the lower joint assembly is connected with the other end of the upper central pipe, one end of the setting assembly is connected with the upper joint assembly, and the other end of the setting assembly is connected with the lower joint assembly. The setting assembly comprises a rubber cylinder, a setting pin located at one end of the rubber cylinder, and an upper piston and a lower piston located at the other end of the rubber cylinder, pressure is injected into the oil pipe, the upper piston and the lower piston are pushed by the pressure to move upwards to extrude the rubber cylinder, the setting pin is cut short, the rubber cylinder expands in diameter after being compressed, and layered sealing is achieved.

In the process of implementing the present invention, the inventor finds that the related art has at least the following problems: when pulling out the packer among the correlation technique, through increaseing the dynamics of lifting, the packing element is damaged with wall of a well friction back, realizes putting forward whole packer simultaneously after unsealing, and the packing element is destroyed when above-mentioned packer pulls out, rubs the wall of a well simultaneously and makes the wall of a well damaged, leads to whole operation process packer spoilage who plays out the packer to be higher.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a packer can solve the higher problem of the spoilage of packer among the correlation technique. The technical scheme is as follows:

according to the utility model discloses a first aspect provides a packer, the packer includes:

the rubber tube sealing device comprises an upper joint, an upper central tube, an outer sleeve, an outer central tube, a first rubber tube seat, a first unsealing component and a second unsealing component, wherein the first unsealing component comprises a shear ring and a shear ring sleeve;

the upper joint is connected with the upper central pipe, the outer sleeve is sleeved outside the upper central pipe, the outer sleeve is connected with one end of the outer sleeve through the shear ring sleeve, the shear ring is embedded into the outer wall of the central pipe and protrudes out of the outer wall of the central pipe, the inner wall of the shear ring sleeve is provided with a step structure, and the step structure abuts against one surface, far away from the upper joint, of the shear ring;

the other end of the outer sleeve is connected with the first rubber cylinder seat, the first rubber cylinder seat is connected with one end of the outer central tube, and the outer central tube is positioned between the outer sleeve and the upper central tube;

the second deblocking subassembly includes stay tube and deblocking pin, the stay tube cover is in go up the center tube outside, and pass through the deblocking pin with it is fixed to go up the center tube, the one end of stay tube is supported the scissors cover is kept away from the one end of top connection.

Optionally, the packer further comprises a second rubber sleeve base, a first piston and a sealing assembly, the second rubber sleeve base is connected with the other end of the outer central tube, a rubber sleeve is sleeved outside the outer central tube, and the rubber sleeve is located between the first rubber sleeve base and the second rubber sleeve base;

the sealing assembly is installed at one end, far away from the rubber cylinder, of the second rubber cylinder seat, the first piston is sleeved outside the central pipe, and one end of the first piston abuts against the sealing assembly.

Optionally, the packer further comprises a lower central tube, a second piston and a lower joint, wherein one end of the lower central tube is connected with the upper central tube, the other end of the lower central tube is connected with the lower joint, the second piston is sleeved on the lower central tube, and one end of the second piston is connected with the first piston.

Optionally, the outer sleeve further comprises at least one liquid inlet hole, and the liquid inlet hole is communicated with an annulus between the outer sleeve and the upper central tube.

Optionally, a liquid storage annulus is arranged between one end of the first piston close to the sealing assembly and the upper central pipe;

and a liquid channel is arranged between the outer central pipe and the upper central pipe, one end of the liquid channel is communicated with the annulus between the outer sleeve and the upper central pipe, and the other end of the liquid channel is communicated with the liquid storage annulus.

Optionally, the support tube further comprises a locking ring, the outer wall of the locking ring is provided with saw teeth, the inner wall of one end of the outer central tube is provided with saw teeth, and the saw teeth can be meshed with the saw teeth on the outer wall of the locking ring.

Optionally, the packer further comprises an anti-collision ring, the anti-collision ring is sleeved outside the lower joint and is in threaded connection with the lower joint, and the other end of the second piston abuts against the anti-collision ring.

Optionally, the second piston, the lower joint and the lower central tube form a piston cavity, and a through hole is formed in the lower central tube and is communicated with the piston cavity.

Optionally, the packer further includes a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring, the first sealing ring is located at a joint between the upper joint and the upper central pipe, the second sealing ring is located at a joint between the second rubber cylinder seat and the outer central pipe, the third sealing ring is located between the first piston and the upper central pipe, and the fourth sealing ring is located between the first piston and the lower central pipe.

Optionally, the packer further comprises a setting pin, and the setting pin penetrates through the outer sleeve to be connected with the outer central pipe.

The embodiment of the utility model provides a beneficial effect that technical scheme brought is:

the packer comprises an upper joint, an upper central pipe, an outer sleeve, an outer central pipe, a first rubber sleeve seat, a first deblocking assembly and a second deblocking assembly, wherein the upper joint is connected with the upper central pipe; the other end of the outer sleeve is connected with a first rubber cylinder seat, the first rubber cylinder seat is connected with one end of an outer central tube, and the outer central tube is positioned between the outer sleeve and the upper central tube; the second deblocking subassembly includes stay tube and deblocking pin, and the stay tube cover is outside last center tube, and fixed with last center tube through the deblocking pin, and the one end of stay tube is supported and is being cut the one end that the loop casing kept away from the top connection. The force of lifting is exerted to the top connection during the deblocking, and until shearing ring or deblocking pin disconnection, the top connection drives shearing ring cover, outer tube and first packing element seat and goes upward, and first packing element seat no longer extrudes the packing element, and the in-process that the packing element recovered the original state lifted does not contact with the wall of a well, reduces the friction, and the packer easily plays out. The problem of play the operation process damage rate of packer higher among the correlation technique is solved, the effect of reducing the packer damage rate has been reached.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a packer provided in an embodiment of the present invention;

FIG. 2 is a cross-sectional view of another packer provided by embodiments of the present invention;

FIG. 3 is an enlarged partial view of the seal assembly of the packer shown in FIG. 2;

FIG. 4 is a half-sectional view of the packer shown in FIG. 2.

With the above figures, certain embodiments of the present invention have been shown and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

The water injection well comprises a vertical well and a deep inclined well, an oil pipe in the water injection well is connected with a packer, and different water layers are isolated by setting through the packer. When the packer is lifted out in the related art, the friction force between the packer and the well wall in the deep inclined well is increased due to the inclination, so that the force required for lifting the packer in the deep inclined well is larger, and the abrasion to the well wall is larger. And the well wall is easy to be adhered with dirt and impurities in the long-term use process, the packer is easy to be clamped when the dirt and the impurities are lifted out, and if the packer is clamped, the packer needs to be maintained through high-cost major workover operation. The working efficiency is reduced while the working cost is increased.

The embodiment of the utility model provides a packer can solve this problem that appears in the correlation technique.

Fig. 1 is a schematic structural diagram of a packer shown in an embodiment of the present invention, and the packer 10 may include:

the pipe joint comprises an upper joint 11, an upper central pipe 12, an outer sleeve 13, an outer central pipe 14, a first rubber sleeve seat 15, a first unsealing component 16 and a second unsealing component 17, wherein the first unsealing component 16 comprises a shear ring 161 and a shear ring sleeve 162.

The upper joint 11 is connected with the upper central tube 12, the outer sleeve 13 is sleeved outside the upper central tube 12, the outer sleeve 13 is connected with one end of the outer sleeve 13 through the shear ring sleeve 162, the shear ring 161 is embedded into the outer wall of the central tube 12 and protrudes out of the outer wall of the central tube 12, the inner wall of the shear ring sleeve 162 is provided with a step structure, and the step structure abuts against one surface, far away from the upper joint 11, of the shear ring 161.

The other end of outer sleeve 13 is connected with first packing element seat 15, and first packing element seat 15 is connected with one end of outer center tube 14, and outer center tube 14 is located between outer sleeve 13 and upper center tube 12.

The second deblocking assembly 17 comprises a support pipe 171 and a deblocking pin 172, the support pipe 171 is sleeved outside the upper central pipe 12 and fixed to the upper central pipe 12 by the deblocking pin 172, and one end of the support pipe 171 abuts against one end of the shear ring sleeve 162 far away from the upper joint 11.

To sum up, the embodiment of the present invention provides a packer including an upper joint, an upper central tube, an outer sleeve, an outer central tube, a first rubber sleeve seat, a first deblocking assembly, and a second deblocking assembly, wherein the upper joint is connected to the upper central tube, the outer sleeve is sleeved outside the upper central tube, the outer sleeve is connected to one end of the outer sleeve through a shear ring sleeve, the shear ring is embedded into the outer wall of the central tube and protrudes out of the outer wall of the central tube, the inner wall of the shear ring sleeve has a step structure, and the step structure abuts against one surface of the shear ring away from the upper joint; the other end of the outer sleeve is connected with a first rubber cylinder seat, the first rubber cylinder seat is connected with one end of an outer central tube, and the outer central tube is positioned between the outer sleeve and the upper central tube; the second deblocking subassembly includes stay tube and deblocking pin, and the stay tube cover is outside last center tube, and fixed with last center tube through the deblocking pin, and the one end of stay tube is supported and is being cut the one end that the loop casing kept away from the top connection. The force of lifting is exerted to the top connection during the deblocking, and until shearing ring or deblocking pin disconnection, the top connection drives shearing ring cover, outer tube and first packing element seat and goes upward, and first packing element seat no longer extrudes the packing element, and the in-process that the packing element recovered the original state lifted does not contact with the wall of a well, reduces the friction, and the packer easily plays out. The problem of play the operation process damage rate of packer higher among the correlation technique is solved, the effect of reducing the packer damage rate has been reached.

Referring to fig. 2, a cross-sectional view of a packer according to an embodiment of the present invention is shown, the packer is an integral type, and for convenience of illustration, the packer is divided into two parts, which are integrated in the direction of the arrow in the figure.

Optionally, the packer further comprises a second rubber cylinder base 18, a first piston 19 and a sealing assembly 20, the second rubber cylinder base 18 is connected with the other end of the outer base pipe 14, a rubber cylinder 21 is sleeved outside the outer base pipe 14, and the rubber cylinder 21 is located between the first rubber cylinder base 15 and the second rubber cylinder base 18; the end of the second rubber cylinder base 18 far away from the rubber cylinder 21 is provided with a sealing component 20, the first piston 19 is sleeved outside the central tube, and one end of the first piston is abutted against the sealing component 20. The second packing element seat 18 includes the screw thread and from the inner groovy that the outer wall caves in to second packing element seat 18, and second packing element seat 18 and outer center tube 14 threaded connection, when setting up the packer, first packing element seat 15 is motionless, and first piston 19 goes upward and extrudes second packing element seat 18, makes second packing element seat 18 extrusion packing element 21 to accomplish and set. Wherein the packing element 21 includes from first packing element seat 15 one end in proper order and down respectively: the double-layer protective bowl, the end rubber sleeve, the spacer ring, the middle rubber sleeve, the spacer ring, the end rubber sleeve and the double-layer protective bowl are designed to be of a double-layer structure, the protective bowls at the two ends of the end rubber sleeve are symmetrical to the inclination angle of the end rubber sleeve, and the temperature and pressure resistant strength of the packer is improved.

The sealing assembly 20 includes a sealing ring sleeve 201 and a sealing ring 202, an end of the second rubber cylinder seat 18 connected to the first piston 19 has a camber angle with a predetermined angle, the sealing ring sleeve 201 is located at the end of the second rubber cylinder seat 18 having the camber angle, and the sealing ring sleeve 201 is in threaded connection with the second rubber cylinder seat 18. Fig. 3 is an enlarged view of a portion of the seal assembly of fig. 2. The seal ring sleeve 201 may be an L-shaped seal ring sleeve 201, the L-shaped seal ring sleeve 201 is located in the inner groove of the second rubber cylinder seat 18, and the seal ring 202 is located between the second rubber cylinder seat 18, the first piston 19 and the seal ring sleeve 201. The outer side of the sealing ring 202 is sleeved with a sealing ring sleeve 201, and the sealing ring sleeve 201 compresses the sealing ring 202. Wherein the seal ring 202 may be a high temperature oil resistant rubber seal ring.

First piston 19 suit is close to the one end of second packing element seat 18 at last center tube 12, and the one end that first piston 19 is connected with second packing element seat 18 has the inclination of predetermineeing the angle, and the other end of first piston 19 can have a plurality of circular shape pressure balance holes, and the one end of going up center tube 12 and being connected with first piston 19 has the external screw thread, has a plurality of circular shape liquid holes on the external screw thread. After liquid enters the packer from the inside of the oil pipe, the liquid enters the plurality of circular liquid outlet holes, and the liquid in the liquid outlet holes can push the first piston to move upwards, so that the setting of the packer is realized. Optionally, the packer further comprises a lower central tube 22, a second piston 23 and a lower joint 24, wherein one end of the lower central tube 22 is connected with the upper central tube 12, the other end of the lower central tube 22 is connected with the lower joint 24, the second piston 23 is sleeved on the lower central tube 22, and one end of the second piston 23 is connected with the first piston 19. The lower central tube 22 and the upper central tube 12 may be in threaded connection, and the lower central tube 22 and the lower joint 24 may also be in threaded connection, so that one end of the lower central tube 22 connected with the lower joint 24 also has external threads, and the external threads also have a plurality of circular liquid outlet holes. One end of the second piston 23 may be threadedly coupled to the first piston 19.

Optionally, the outer casing 13 further comprises at least one liquid inlet hole 27, and the liquid inlet hole 27 is communicated with an annular space between the outer casing 13 and the upper central pipe 12. The embodiment of the utility model provides an in the packer can also carry out the backwash well, and the water injection well is in long-term use, and the interior tubular column of well easily scales up, blocks up, or sewage leads to the oil reservoir to pollute in the well, carries out the backwash well to the water injection well and is that to wash the well liquid from the annular space injection of sleeve pipe with oil pipe, get back to ground along oil pipe after getting into oil pipe bottom, discharge to sewage recovery ware. The packer is located the oil pipe bottom, and the diameter is close with the annular space of sleeve pipe and oil pipe, and the flushing fluid that injects into from the annular space of sleeve pipe and oil pipe can get into the packer from feed liquor hole 27 on packer outer tube 13, and rethread packer gets into oil pipe, also can clear up the packer when the backwashing well.

Optionally, a reservoir annular space 29 is provided between the end of the first piston 19 adjacent the seal assembly 20 and the upper base pipe 12; a liquid channel 28 is arranged between the outer central tube 14 and the upper central tube 12, one end of the liquid channel 28 is communicated with the annular space between the outer sleeve 13 and the upper central tube 12, and the other end of the liquid channel 28 is communicated with a liquid storage annular space 29. In the backwashing well process, backwashing liquid under high pressure enters from at least one liquid inlet hole 27 of the packer and flows into a liquid storage annular space 29 through a liquid channel 28, the backwashing liquid pushes a first piston 19 to move downwards along with the increase of the pressure of the backwashing liquid, the liquid in the liquid channel 28 flows out of a gap reserved after the first piston 19 moves downwards to the annular space between the casing and the oil pipe, then enters the oil pipe from the annular space, and finally returns out of the well mouth from the oil pipe so as to realize backwashing well.

Optionally, a locking ring 173 is further included on the support tube 171, the locking ring 173 having serrations on an outer wall thereof, and the inner wall of the end of the outer core tube 14 having serrations capable of engaging the serrations on the outer wall of the locking ring 173. The outer surface of the locking ring 173 has serrated threads that engage the serrations and may be angled to engage the serrations on the outer base pipe 14, and when setting the packer, the outer base pipe 14 travels upward and the locking ring 173 engages the serrations to connect the support tube 171 to the outer base pipe 14, completing the setting of the packer. The engagement is a connection mode used in the embodiment of the present invention, and the connection between the support tube 171 and the outer central tube 14 can be completed without any operation, and other connection modes can also be used.

Optionally, the packer further comprises an anti-collision ring 25, the anti-collision ring 25 is sleeved outside the lower joint 24 and is in threaded connection with the lower joint 24, and the other end of the second piston 23 abuts against the anti-collision ring 25. After the anti-collision ring 25 is connected with the lower connector 24, the diameter of the anti-collision ring 25 on the outer wall of the packer is larger than the diameter of the outer wall of the packer at other positions, so that the outer wall of the packer can be prevented from being rubbed with the inner wall of the sleeve and the outer wall of the oil pipe in the process of pulling the packer and the oil pipe. The damage rate of the packer is reduced, and the service life of the packer is prolonged. The anti-collision device 25 may be made of a hard material, and the embodiment of the present invention is not limited herein.

Optionally, the packer further comprises a setting pin 26 connected to the outer base pipe 14 through the outer sleeve 13. The number of the setting pins 26 can be set according to the structure of the packer, the outer sleeve 13 can be provided with threaded holes, the outer central tube 14 can be provided with pin grooves, and the plurality of setting pins 26 correspondingly penetrate through the threaded holes in the outer sleeve 13 one to one and enter the pin grooves in the outer central tube 14 to connect and fix the outer sleeve 13 and the outer central tube 14.

Optionally, the second piston 23, the lower joint 24 and the lower central tube 22 form a piston cavity 31, and the lower central tube 22 has a through hole, and the through hole is communicated with the piston cavity 31. The piston chamber 31 communicates with the packer interior, by means of which piston chamber 31 the packer setting can be achieved. The specific flow of packer setting is as follows: after the packer is put into a designated position in a water injection well, water is injected into the oil pipe, the water in the oil pipe enters the interior of the packer under the action of pressure and enters the piston cavity 31 through the through hole in the lower central pipe 22, the pressure of the water in the interior of the packer increases along with the increase of the water amount, the water in the piston cavity 31 pushes the first piston 19 and the second piston 23 to move upwards under the action of the pressure, the upward pressure of the pistons enables the setting pin to be automatically cut off, the first piston 19 and the second piston 23 push the second rubber cylinder seat 18 to move upwards to compress the rubber cylinder 21, meanwhile, the outer central pipe 14 moves upwards, a locking ring on the outer central pipe 14 is meshed with the sawteeth on the supporting pipe 171, and the setting of the packer is. The piston chamber 31 and the plurality of circular liquid outlet holes at the end of the upper central tube 12 connected with the first piston 19 can be simultaneously used as piston chambers, so that the packer has a double-stage setting mechanism.

Optionally, the packer further comprises a first sealing ring 301, a second sealing ring 302, a third sealing ring 303 and a fourth sealing ring 304, wherein the first sealing ring 301 is located at the joint of the upper joint 11 and the upper central pipe 12, the second sealing ring 302 is located at the joint of the second rubber cylinder seat 18 and the outer central pipe 14, the third sealing ring 303 is located between the first piston 19 and the upper central pipe 12, and the fourth sealing ring 304 is located between the first piston 19 and the lower central pipe 22. A first sealing ring 301 may be fitted over the upper joint 11 to seal between the upper joint 11 and the upper central tube 12. A second sealing ring 302 may be fitted over the second rubber cartridge holder 18 to seal between the second rubber cartridge holder 18 and the outer center tube 14. A third sealing ring 303 may be fitted over the first piston 19 to effect a seal between the first piston 19 and the upper central tube 12. A fourth sealing ring 304 may be fitted over lower center tube 22 to seal between first piston 19 and lower center tube 22. The material of sealing washer can be rubber, also can be the better material of other sealed effects, the embodiment of the utility model provides a do not limit here. In addition, the joints of other parts can be provided with sealing rings for sealing, for example, the joint of the second piston and the lower joint can also be provided with sealing rings, the joint of the first rubber cylinder seat and the outer central pipe can also be provided with sealing rings, and the like.

FIG. 4 is a half-sectional view of the packer of FIG. 2, the packer being one-piece and being divided into two parts for ease of illustration, the two parts being one-piece in the direction of the arrows in the figure. Taking fig. 4 as an example, in the embodiment of the present invention, when the packer is unset, the upper joint 11 is lifted, the supporting tube 171 goes upward, the unset pin 172 is automatically cut off, the upper joint 11 drives the outer sleeve 13 and the first rubber cylinder seat 15 to go upward, the rubber cylinder 21 loses the support of the first rubber cylinder seat 15 and then returns to its original state, the unset of the packer is realized, and the unset is also called as one-level unset.

And (3) continuously lifting the packer, driving the shearing ring sleeve 162 to move upwards by the upper joint 11, shearing the shearing ring 161, keeping the parts below the upper central pipe 12 and the rubber cylinder 21 stationary, driving the shearing ring sleeve 162, the outer sleeve 13 and the first rubber cylinder seat 15 to move upwards by the upper joint 11, and restoring the rubber cylinder 21 to the original state after the rubber cylinder 21 loses the support of the first rubber cylinder seat 15, so that the packer is unsealed, wherein the unsealing is also called secondary unsealing. Wherein, the shear ring 161 can be a double semi-ring structure, the shear ring 161 and the shear ring sleeve 162 are in surface contact, the shearing area is large, the shearing force is stable, and the reliability is high. The first-stage deblocking and the second-stage deblocking can be simultaneously realized when the packer is lifted, and the second-stage deblocking can also play a role when the first-stage deblocking is invalid. Because the environment in the well is comparatively complicated, consequently set up two-stage deblocking simultaneously and can avoid the unable smooth deblocking packer under the condition that one-level deblocking became invalid. In addition, when one-level deblocking and second grade deblocking all can't be realized, can carry out big well workover this moment, lift center tube 12 on energetically, until going up center tube 12 and first piston 19 junction fracture, go up center tube 12 and drive the part above first piston 19 and go out the well, guarantee that the well can not scrap, this deblocking is also called tertiary deblocking. The embodiment of the utility model provides a packer is through setting up multistage deblocking to guarantee that the packer can still realize the deblocking in the well under the multiple complicated well internal environment of vertical well and deep inclined shaft, make packing element reconversion in the well, lift the in-process and can not rub with the wall of a well, prolonged the life of packer, reduce the operation degree of difficulty of knowing the packer simultaneously, reduced deep inclined shaft tubular column and unfreeze and carried and draw load, avoid measure operation overhaul risk, improved workover efficiency.

The above description is only an alternative embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A packer, comprising:

2. The packer of claim 1, further comprising a second packing element seat, a first piston, and a seal assembly, the second packing element seat being coupled to the other end of the outer base pipe, the outer base pipe having a packing element disposed therebetween;

3. The packer of claim 2, further comprising a lower center tube, a second piston, and a lower sub, wherein one end of the lower center tube is connected to the upper center tube, the other end of the lower center tube is connected to the lower sub, the second piston is sleeved on the lower center tube, and one end of the second piston is connected to the first piston.

4. The packer of claim 1, further comprising at least one fluid inlet hole in the outer casing, the fluid inlet hole being in communication with an annulus between the outer casing and the upper base pipe.

5. The packer of claim 2, wherein the first piston has a reservoir annulus between an end proximate the seal assembly and the upper base pipe;

6. The packer of claim 1, further comprising a locking ring on the support tube, the locking ring having serrations on an outer wall thereof, the inner wall of the one end of the outer base pipe having serrations engageable with the serrations on the outer wall of the locking ring.

7. A packer as claimed in claim 3, further comprising an anti-collision ring, wherein the anti-collision ring is sleeved outside the lower joint and is in threaded connection with the lower joint, and the other end of the second piston abuts against the anti-collision ring.

8. A packer as claimed in claim 3, wherein the second piston, the lower sub and the lower base pipe define a piston chamber, and the lower base pipe has a through bore therein which communicates with the piston chamber.

9. A packer as claimed in claim 3, further comprising a first seal ring at the junction of the upper sub and the upper base pipe, a second seal ring at the junction of the second sleeve mount and the outer base pipe, a third seal ring between the first piston and the upper base pipe, and a fourth seal ring between the first piston and the lower base pipe.

10. The packer of claim 1, further comprising a setting pin connected with the outer base pipe through the outer sleeve.