CN111472713A

CN111472713A - Packer

Info

Publication number: CN111472713A
Application number: CN202010284632.0A
Authority: CN
Inventors: 陈少同; 马金焕; 其他发明人请求不公开姓名
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-13
Filing date: 2020-04-13
Publication date: 2020-07-31

Abstract

The invention belongs to the field of oilfield development tools, and discloses a packer which comprises a body, a positioning sleeve, a sliding sleeve and a rubber sleeve; the body, the positioning sleeve and the rubber sleeve are sequentially sleeved and connected from inside to outside, a medium containing cavity is arranged in the body, the sliding sleeve is positioned between the body and the positioning sleeve and can reciprocate, two ends of the rubber sleeve and the outer surface of the positioning sleeve form sealing fixation, and the middle section of the rubber sleeve can perform radial reciprocating expansion and retraction relative to the positioning sleeve; the body is provided with a first oil hole and a second oil hole which are communicated with the medium accommodating cavity; a third oil hole is formed in the positioning sleeve, one end of the third oil hole penetrates through the middle section of the positioning sleeve pointing to the rubber sleeve, and the other end of the third oil hole is in selective communication or full sealing with the first oil hole and the second oil hole through the sliding sleeve; the rubber sleeve expands when the sliding sleeve moves until the first oil hole is communicated with the third oil hole; and the rubber sleeve retracts when the sliding sleeve moves to the second oil hole and the third oil hole to be communicated. The packer is simple and convenient to operate, and can realize repeated setting and unsealing operations.

Description

Packer

Technical Field

The invention belongs to the field of oilfield development tools, and particularly relates to a packer.

Background

In the process of oil field development, setting and unsetting are usually realized by means of packers, which can be classified into: self-sealing, compression, wedging, expansion, combination, and the like; packers can be divided into according to the setting principle: lifting and placing a pipe column type, rotating a pipe column type, self-sealing type, thermal expansion type and the like.

At present, common packers generally cannot achieve multiple setting in an oil well. For example, when a hydraulic packer is unset, the locking ring needs to be unlocked by lifting the pipe column, which causes the operation to be irreversible, so that multiple setting operations cannot be realized. Even if some packers can realize setting many times, but the process of realizing setting and unsetting is too loaded down with trivial details, can reduce the oil field development progress. Therefore, a packer which can realize setting for many times and is simple to control is urgently needed.

Disclosure of Invention

In order to realize multiple setting of the packer in the oil field development process, the invention provides a packer with a brand new structure. The packer comprises a body, a positioning sleeve, a sliding sleeve and a rubber sleeve; the body, the positioning sleeve and the rubber sleeve are sequentially sleeved and connected from inside to outside, a medium containing cavity along the axial direction is arranged inside the body to contain a medium for driving the rubber sleeve to perform seat sealing and unsealing, the sliding sleeve is positioned between the body and the positioning sleeve and can perform reciprocating motion, two ends of the rubber sleeve are respectively and hermetically fixed with the outer surfaces of two ends of the positioning sleeve, and the middle section of the rubber sleeve can perform radial reciprocating expansion and retraction relative to the positioning sleeve; a first oil hole and a second oil hole are formed in the body, and the first oil hole and the second oil hole are communicated with the medium accommodating cavity at the same time; a third oil hole is formed in the positioning sleeve, one end of the third oil hole penetrates through the middle section of the positioning sleeve and points to the rubber barrel, and the other end of the third oil hole is communicated with the first oil hole and the second oil hole in a selective or fully-closed mode through the sliding sleeve;

when the medium pressure in the medium containing cavity is increased and the sliding sleeve moves to the first oil hole and the third oil hole to be communicated, the rubber sleeve performs expansion action; when the medium pressure in the medium containing cavity is reduced and the sliding sleeve moves to the second oil hole and is communicated with the third oil hole, the rubber sleeve retracts.

Preferably, the sliding sleeve is composed of an upper sliding sleeve and a lower sliding sleeve which are independent from each other and can move axially, and a reset elastic piece is arranged between the upper sliding sleeve and the lower sliding sleeve along the axial direction; when the lower sliding sleeve moves upwards against the reset elastic piece, the first oil hole is communicated with the third oil hole; when the upper sliding sleeve moves downwards against the return elastic piece, the second oil hole is communicated with the third oil hole.

Further preferably, the packer further comprises a control sleeve; the control sleeve is positioned between the positioning sleeve and the sliding sleeve and is movably connected with the upper end of the upper sliding sleeve and the lower end of the lower sliding sleeve respectively so as to drive the upper sliding sleeve to move downwards and drive the lower sliding sleeve to move upwards; and a fourth oil hole is formed in the control sleeve, is communicated with the third oil hole and is selectively communicated with or fully sealed with the first oil hole and the second oil hole.

Further preferably, an upper retainer ring and a lower retainer ring are arranged on the inner surface of the control sleeve; the upper retainer ring is positioned above the upper sliding sleeve so as to drive the upper sliding sleeve to move downwards; the lower retainer ring is positioned below the lower sliding sleeve to drive the lower sliding sleeve to move upwards.

Further preferably, an oil groove arranged in the axial direction is provided on an outer surface of the control sleeve, and the oil groove is in communication with the third oil hole and the fourth oil hole.

Preferably, the body is further provided with a first oil path and a second oil path, and an upper control cavity and a lower control cavity which are independent and closed are respectively arranged above and below the control sleeve; one end of the first oil path is communicated with the medium containing cavity, and the other end of the first oil path extends to the lower control cavity so as to contain the medium in the medium containing cavity and drive the control sleeve to move upwards; one end of the second oil way is communicated with an external control medium, and the other end of the second oil way extends to the upper control cavity so as to accommodate the external control medium to drive the control sleeve to move downwards.

Further preferably, the packer is also provided with an upper control elastic element and a lower control elastic element; the upper control elastic piece is positioned in the upper control cavity to drive the control sleeve to move downwards; the lower control elastic piece is positioned in the lower control cavity to drive the control sleeve to move upwards.

Preferably, the upper sliding sleeve and the lower sliding sleeve are respectively sealed with the body by cones.

Preferably, the rubber cylinder is fixedly connected with the positioning sleeve through the upper sleeve and the lower sleeve, and the upper sleeve and the lower sleeve are connected with the rubber cylinder in a trapezoidal buckle mode.

Preferably, the body adopts split type structure, comprises last connecting seat, lower connecting seat and adapter sleeve, and the adapter sleeve respectively with go up the connecting seat with lower connecting seat adopts threaded connection.

Compared with the packer with the existing structure, the packer has the following beneficial technical effects:

1. in the packer, a sliding sleeve capable of reciprocating is arranged between a body and a positioning sleeve, a first oil hole and a second oil hole are arranged on the body, a third through hole is arranged on the positioning sleeve, the first oil hole and the second oil hole are communicated with a medium containing cavity, and the third through hole is communicated with a gap between a rubber sleeve and the positioning sleeve. Therefore, repeated operations of sealing and unsealing are realized, and only the movement of the sliding sleeve and the change of the medium pressure in the medium containing cavity need to be controlled, so that the control complexity is greatly reduced, and the operation convenience is improved.

2. In the invention, the sliding sleeves are designed into an upper sliding sleeve structure and a lower sliding sleeve structure, and the reset elastic piece is arranged between the two sliding sleeves. Like this, not only can keep going up sliding sleeve and lower sliding sleeve respectively in the confined state to second oilhole and first oilhole with the help of the elastic component that resets, avoid first oilhole and second oilhole to form the intercommunication with the third oilhole simultaneously, but also can form the independent drive control to going up sliding sleeve and lower sliding sleeve, avoid taking place the maloperation of opening the action simultaneously to improve the control accuracy to the expansion of packing element and the action of contracting, guarantee the reliable stability of seat seal and deblocking operation.

3. According to the packer, the control springs are respectively arranged at the two ends of the control sleeve, so that the reliability guarantee can be provided for the setting process and the unpacking process by means of the control springs, the accidental unpacking operation in the setting process and the accidental unpacking operation in the unpacking process are avoided, the accuracy of the setting and the unpacking operation is ensured, and the working reliability of the packer is improved.

Drawings

FIG. 1 is a schematic structural view of the packer in a normal state in the embodiment;

FIG. 2 is a schematic structural view of the packer of the present embodiment when set;

fig. 3 is a schematic structural diagram of the packer of the present embodiment when unset.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1 to 3, the packer of the present embodiment includes a body 1, a positioning sleeve 2, a sliding sleeve 3 and a packing element 4, and the body 1, the positioning sleeve 2 and the packing element 3 are sequentially sleeved from inside to outside. The body 1 is provided with an axial medium cavity 11 for accommodating a medium for driving the rubber cylinder 4 to perform setting and unsetting. The sliding sleeve 3 is located between the body 1 and the positioning sleeve 2 and can perform axial reciprocating motion, two ends of the rubber cylinder 4 are respectively sealed and fixed with outer surfaces of two ends of the positioning sleeve 2, and the middle section of the rubber cylinder 4 can perform radial reciprocating expansion and retraction relative to the positioning sleeve 2.

A first oil hole 12 and a second oil hole 13 are formed in the body 1, and the first oil hole 12 and the second oil hole 13 are simultaneously communicated with the medium accommodating chamber 11. The positioning sleeve 2 is provided with a third oil hole 21, one end of the third oil hole 21 radially penetrates through the middle section of the positioning sleeve 2 pointing to the rubber sleeve 4, and the other end of the third oil hole 21 is communicated or totally closed with the first oil hole 12 and the second oil hole 13 through the sliding sleeve 3, namely, the third oil hole 21 is communicated with the first oil hole 12, or the third oil hole 21 is communicated with the second oil hole 13, or the third oil hole 21 is simultaneously closed with the first oil hole 12 and the second oil hole 13.

At this time, when the pressure of the medium in the medium accommodating cavity 11 rises and the sliding sleeve 3 axially moves until the first oil hole 12 and the third oil hole 21 form a communicating relationship, the high-pressure medium in the medium accommodating cavity 11 is guided to flow between the rubber sleeve 4 and the positioning sleeve 2 to drive the rubber sleeve 4 to expand, and after the rubber sleeve 4 expands to a position, the sliding sleeve 3 axially moves to a position where the third oil hole 21, the first oil hole 12 and the second oil hole 13 are simultaneously closed, and the high-pressure medium is closed between the rubber sleeve 4 and the positioning sleeve 2, so that the seat sealing is completed. When the medium pressure in the medium accommodating cavity 11 is reduced and the sliding sleeve 3 moves in the axial direction until the second oil hole 13 and the third oil hole 21 form a communicating relation, the high-pressure medium between the rubber sleeve 4 and the positioning sleeve 2 flows into the medium accommodating cavity 11 to release the pressure, so that the rubber sleeve 4 retracts, and unsealing is completed.

As shown in fig. 1 to 3, the sliding sleeve 3 is composed of an upper sliding sleeve 31 and a lower sliding sleeve 32 which are independent from each other and can move axially, and a restoring elastic member 51 is provided between the upper sliding sleeve 31 and the lower sliding sleeve 32 in the axial direction. The return elastic member 51 can make the upper sliding sleeve 31 and the lower sliding sleeve 32 simultaneously in sealing contact with the body 1, so as to maintain the closed state of the third oil hole 21, the third oil hole 21 is communicated with the first oil hole 12 only when the lower sliding sleeve 32 moves upward against the acting force of the return elastic member 51, and the third oil hole 21 is communicated with the second oil hole 13 only when the upper sliding sleeve 31 moves downward against the acting force of the return elastic member 51.

At this time, the on-off relation between the third oil hole and the first oil hole and the on-off relation between the third oil hole and the second oil hole can be controlled by independently controlling the upper sliding sleeve and the lower sliding sleeve respectively. Similarly, in other embodiments, an integral sliding sleeve can be used to perform the on-off relationship between the three oil holes, and the switching of the on-off relationship between the three oil holes can be realized by controlling the reciprocating motion of the sliding sleeve along the axial direction by performing the structural design of the sliding sleeve and the arrangement of the relative positions of the three oil holes according to the structural form of the sliding valve.

In addition, in this embodiment, the switching of the on-off relationship between the three oil holes is formed by the reciprocating motion of the sliding sleeve along the axial direction, so as to realize the control of the expansion and retraction of the rubber cylinder, and similarly, in other embodiments, the sliding sleeve may be designed to rotate along the circumferential direction, for example, radial through holes are arranged on the sliding sleeve and the first oil hole and the second oil hole are arranged in two diameter directions on the same cross section of the body, so that the on-off relationship between the three oil holes can be controlled by the reciprocating motion of the sliding sleeve along the circumferential direction, and the final control of the expansion and retraction of the rubber cylinder is realized.

As shown in fig. 1 to 3, the packer of the present embodiment further includes a control sleeve 6. The control sleeve 6 is axially sleeved between the positioning sleeve 2 and the sliding sleeve 3, and is movably connected with the upper end of the upper sliding sleeve 31 and the lower end of the lower sliding sleeve 32 respectively to drive the upper sliding sleeve 31 to move downwards and drive the lower sliding sleeve 32 to move upwards. Meanwhile, a fourth oil hole 61 is provided in the control sleeve 6, the fourth oil hole 61 is in communication with the third oil hole 21, and is in selective communication with the first oil hole 12 and the second oil hole 13.

At the moment, the control sleeve is controlled by reciprocating motion, so that the motion control of the upper sliding sleeve and the lower sliding sleeve can be completed, the control sleeve only can drive the upper sliding sleeve or the lower sliding sleeve at a single time, the situation that the upper sliding sleeve and the lower sliding sleeve move simultaneously and the third oil hole is communicated with the first oil hole and the second oil hole at the same time can be avoided, and the accurate control of the action of the rubber sleeve is ensured.

As shown in fig. 1 to 3, in the present embodiment, an upper retainer 62 and a lower retainer 63 are respectively disposed on the inner surface of the control sleeve 6, wherein the upper retainer 62 is located at an upper position of the upper sliding sleeve 31, and the lower retainer 63 is located at a lower position of the lower sliding sleeve 32, so that the upper retainer 62 and the lower retainer 63 respectively drive the upper sliding sleeve 31 to move downwards and the lower sliding sleeve 32 to move upwards.

Therefore, the upper sliding sleeve and the lower sliding sleeve can be driven to move by virtue of the boss structure formed by the upper check ring and the lower check ring so as to overcome the reset spring and control the on-off between the oil holes. Similarly, in other embodiments, the two positioning pins may be disposed on the inner surface of the control sleeve, and the axial sliding grooves may be disposed on the outer surfaces of the upper sliding sleeve and the lower sliding sleeve, so that the two positioning pins move in the sliding grooves on the surfaces of the upper sliding sleeve and the lower sliding sleeve, respectively, to form an axial movement driving of the upper sliding sleeve and the lower sliding sleeve.

Further, an oil groove 64 is provided on the outer surface of the control sleeve 6 so as to run in the axial direction, and the dimension of the oil groove 64 running in the axial direction is long enough to be in communicating relation with the third oil hole 21 and the fourth oil hole 61. Therefore, in the process of reciprocating motion of the control sleeve along the axial direction, the fourth oil hole can be guaranteed to be communicated with the third oil hole all the time, and accurate control over the motion of the rubber cylinder is guaranteed.

As shown in fig. 1 to 3, the main body 1 is further provided with a first oil passage 14 and a second oil passage 15, and an upper control chamber 16 and a lower control chamber 17 which are independent and sealed from each other are provided at the upper end and the lower end of the control sleeve 6, respectively. One end of the first oil path 14 is communicated with the medium accommodating cavity 11, and the other end of the first oil path extends to be communicated with the lower control cavity 17 so as to guide the medium in the medium accommodating cavity 11 to drive the control sleeve 6 to move upwards. One end of the second oil path 15 is communicated with the external control medium, and the other end of the second oil path extends to be communicated with the upper control cavity 16, so that the control sleeve 6 is driven to move downwards by the external control medium.

At the moment, the axial reciprocating motion of the control sleeve can be controlled through the medium and the external control medium in the medium containing cavity, the medium pressure in the medium containing cavity rises, the first oil hole is communicated with the third oil hole, and the rubber sleeve expands to achieve a synchronous effect, namely when the medium pressure in the medium containing cavity rises and drives the control sleeve to move upwards, the first oil hole and the third oil hole form a communicated relation, so that the rubber sleeve is driven to expand by guiding the high-pressure medium, and when the medium pressure in the medium containing cavity is reduced in expansion in place, the control sleeve resets to close the communication between the third oil hole and the first oil hole, so that the high-pressure medium is sealed between the rubber sleeve and the positioning sleeve, the automatic seat sealing operation is completed, and the effect of improving the automation of the seat sealing operation is achieved. On the contrary, when the deblocking operation is to be performed, the control sleeve is driven by the external control medium to axially move to the third oil hole to be communicated with the second oil hole, so that the free deblocking operation is completed under the action of the external control medium.

Further, in the packer of the present embodiment, an upper control elastic member 52 and a lower control elastic member 53 are provided. Wherein the upper control elastic element 52 is axially arranged in the upper control chamber 16 to drive the control sleeve 6 to move downwards; the lower control spring 53 is arranged axially in the lower control chamber 17 to drive the control sleeve 6 upwards.

At this moment, not only upper control elastic component and lower control elastic component have formed the control pressure of setting and deblocking, just can drive the control cover motion and form the setting in order to realize the inflation motion of packing element when the medium pressure that the medium held the chamber is greater than the effort of upper control elastic component promptly, also can drive the control cover motion and realize the deblocking in order to realize the movement of contracting of packing element only when the external control medium pressure is greater than the effort of lower control elastic component, and can avoid taking place unexpected deblocking operation with the help of lower control elastic component in the setting process, can avoid taking place unexpected setting operation with the help of upper control elastic component in the deblocking process, thereby guarantee the accurate nature of setting and deblocking operation, improve the operational reliability of whole packer.

Although in this embodiment, the control sleeve controls the axial movement under the combined action of the medium and the elastic element, and the sliding sleeve also realizes the axial reciprocating movement under the driving of the control sleeve, in other embodiments, the axial movement of the sliding sleeve or the control sleeve can be controlled directly by a linear driving mechanism, such as an electromagnetic controller or a linear movement motor, according to the whole design size of the whole packer.

In addition, in this embodiment, go up the sliding sleeve and adopt the inclined plane as sealed face respectively with the lower sliding sleeve to this and body between form awl sealed, thereby improve the sealed effect to first oilhole and second oilhole, guarantee the seat and seal the effect.

Referring to fig. 1 to 3, in the present embodiment, the rubber tube 4 is fixedly connected to the positioning sleeve 2 by the upper sleeve 71 and the lower sleeve 72, and the upper sleeve 71, the lower sleeve 72 and the rubber tube 5 are connected by a trapezoidal buckle, so as to improve the sealing effect on the rubber tube 4 and prevent leakage during the setting and unsealing processes.

In addition, as shown in fig. 1 to 3, the body 1 is of a split structure, and is composed of an upper connecting seat 18, a lower connecting seat 19 and a connecting sleeve 10, and the connecting sleeve 10 is respectively in threaded connection with the upper connecting seat 18 and the lower connecting seat 19. Therefore, the packer has the advantages that each part can be conveniently machined and manufactured, machining precision is improved, the whole packer can be conveniently disassembled and assembled, and installation efficiency and maintenance convenience are improved.

In addition, in the embodiment, the return elastic member, the first control elastic member and the second control elastic member are all coil springs, and in the same embodiment, other elastic members, such as disc springs, may be used to provide the pre-tightening force.

Referring to fig. 1 to 3, when the packer of this embodiment is used for setting and unsetting operations, first, the packer is connected to a medium pipeline for controlling setting through an upper connection seat 18 and a lower connection seat 19, medium is introduced into the medium accommodating cavity 11, and a second oil path 15 is connected to a medium pipeline for controlling unsetting, and then the whole packer is lowered to a position with a desired depth in the well, and then setting and unsetting operations are performed, specifically, as follows:

when the packer is lowered to a position with required depth in a well and setting is started, the medium pressure in the medium containing cavity 11 is increased, the first oil path 14 guides high-pressure medium to the lower control cavity 17 to overcome the acting force of the upper control elastic part 52 to drive the control sleeve 6 to move upwards, the lower check ring 63 drives the lower sliding sleeve 32 to overcome the acting force of the reset elastic part 51 to move upwards synchronously, so that the fourth oil hole 61 is communicated with the first oil hole 12, and the high-pressure medium in the medium containing cavity 11 is guided to a position between the rubber sleeve 4 and the positioning sleeve 2 through the first oil hole 12, the fourth oil hole 61 and the third oil hole 21, so that the rubber sleeve 4 is driven to expand. After the rubber sleeve 4 is expanded to a certain position, the medium pressure in the medium accommodating cavity 11 starts to be reduced, so that the control sleeve 6 loses the acting force generated by the medium in the lower control cavity 17 and moves downwards under the action of the upper control elastic part 52, the lower sliding sleeve 32 loses the acting force of the control sleeve 6 and moves downwards under the action of the reset elastic part 51, the communication between the third oil hole 21 and the first oil hole 12 is cut off, the high-pressure medium is sealed between the rubber sleeve 4 and the positioning sleeve 2, the expansion state of the rubber sleeve 4 is kept, and the seat sealing operation is completed.

When the packer needs to be unsealed, an external control medium is guided to the upper control cavity 16 through the second oil path 15 to overcome the acting force of the lower control elastic part 53 and drive the control sleeve 6 to move downwards, the upper check ring 62 drives the upper sliding sleeve 31 to overcome the acting force of the reset elastic part 51 and synchronously move downwards, so that the fourth oil hole 61 is communicated with the second oil hole 13, a high-pressure medium between the rubber sleeve 4 and the positioning sleeve 2 flows back to the medium accommodating cavity 11 through the third oil hole 21, the fourth oil hole 61 and the second oil hole 13, the rubber sleeve 4 loses the effect of the high-pressure medium and retracts, and the unsealing operation is completed. Then, the control sleeve 6 is restored by the lower control elastic member 53 after the external control medium pressure is reduced to lose the external control medium pressure, and the upper and lower sliding

sleeves

31 and 32 are also restored to the positions closing the second and first oil holes 13 and 12 by the restoring elastic member 51.

The process is repeated in sequence, multiple setting and unsetting operations of the packer can be realized by controlling the pressure change of the medium in the medium containing cavity and the pressure change of the external control medium, and repeatable multiple setting operations are realized.

Claims

1. A packer is characterized by comprising a body, a positioning sleeve, a sliding sleeve and a rubber sleeve; the body, the positioning sleeve and the rubber sleeve are sequentially sleeved and connected from inside to outside, a medium containing cavity along the axial direction is arranged inside the body to contain a medium for driving the rubber sleeve to perform seat sealing and unsealing, the sliding sleeve is positioned between the body and the positioning sleeve and can perform reciprocating motion, two ends of the rubber sleeve are respectively and hermetically fixed with the outer surfaces of two ends of the positioning sleeve, and the middle section of the rubber sleeve can perform radial reciprocating expansion and retraction relative to the positioning sleeve; a first oil hole and a second oil hole are formed in the body, and the first oil hole and the second oil hole are communicated with the medium accommodating cavity at the same time; a third oil hole is formed in the positioning sleeve, one end of the third oil hole penetrates through the middle section of the positioning sleeve and points to the rubber barrel, and the other end of the third oil hole is selectively communicated or totally closed with the first oil hole and the second oil hole through the sliding sleeve;

2. The packer as claimed in claim 1, wherein the sliding sleeve is composed of an upper sliding sleeve and a lower sliding sleeve which are independent from each other and can perform axial movement, and a return elastic member is arranged between the upper sliding sleeve and the lower sliding sleeve along the axial direction; when the lower sliding sleeve moves upwards against the reset elastic piece, the first oil hole is communicated with the third oil hole; when the upper sliding sleeve moves downwards against the return elastic piece, the second oil hole is communicated with the third oil hole.

3. The packer of claim 2, further comprising a control sleeve; the control sleeve is positioned between the positioning sleeve and the sliding sleeve and is movably connected with the upper end of the upper sliding sleeve and the lower end of the lower sliding sleeve respectively so as to drive the upper sliding sleeve to move downwards and drive the lower sliding sleeve to move upwards; and a fourth oil hole is formed in the control sleeve, is communicated with the third oil hole and is selectively communicated with or fully sealed with the first oil hole and the second oil hole.

4. A packer as claimed in claim 3, wherein an upper and lower retainer ring are provided on the inner surface of the control sleeve; the upper retainer ring is positioned above the upper sliding sleeve so as to drive the upper sliding sleeve to move downwards; the lower retainer ring is positioned below the lower sliding sleeve to drive the lower sliding sleeve to move upwards.

5. A packer as claimed in claim 3, wherein the outer surface of the control sleeve is provided with an oil groove running in the axial direction, and the oil groove is in communication with the third oil hole and the fourth oil hole.

6. The packer of claim 3, wherein the body is further provided with a first oil path and a second oil path, and an upper control cavity and a lower control cavity which are independent and closed are respectively arranged above and below the control sleeve; one end of the first oil path is communicated with the medium containing cavity, and the other end of the first oil path extends to the lower control cavity so as to contain the medium in the medium containing cavity and drive the control sleeve to move upwards; one end of the second oil way is communicated with an external control medium, and the other end of the second oil way extends to the upper control cavity so as to accommodate the external control medium to drive the control sleeve to move downwards.

7. A packer as claimed in claim 6, wherein the packer is further provided with an upper control spring and a lower control spring; the upper control elastic piece is positioned in the upper control cavity to drive the control sleeve to move downwards; the lower control elastic piece is positioned in the lower control cavity to drive the control sleeve to move upwards.

8. The packer according to any one of claims 2 to 7, wherein the upper sliding sleeve and the lower sliding sleeve are respectively sealed with the body by a cone.

9. The packer according to any one of claims 1 to 7, wherein the rubber cylinder is fixedly connected with the positioning sleeve through the upper sleeve and the lower sleeve, and the upper sleeve and the lower sleeve are connected with the rubber cylinder in a manner of a trapezoidal buckle.

10. The packer as claimed in any one of claims 1 to 7, wherein the body is of a split structure and comprises an upper connecting seat, a lower connecting seat and connecting sleeves, and the connecting sleeves are respectively in threaded connection with the upper connecting seat and the lower connecting seat.