CN211623380U

CN211623380U - Packer with radial supporting function

Info

Publication number: CN211623380U
Application number: CN202020230717.6U
Authority: CN
Inventors: 罗开; 施雷; 王健刚; 王克强
Original assignee: Yangtze University
Current assignee: Yangtze University
Priority date: 2020-03-01
Filing date: 2020-03-01
Publication date: 2020-10-02
Anticipated expiration: 2030-03-01

Abstract

The utility model relates to a packer with radial support function belongs to downhole tool technical field. The packer with the radial supporting function consists of a central pipe, an upper joint, a lower joint, a supporting sleeve, a piston sleeve and a rubber sleeve; the upper end of the central pipe is in threaded connection with an upper joint; the lower end of the central pipe is in threaded connection with a lower joint; a support sleeve is fixedly arranged on the central pipe below the upper joint through a fastening screw; the thin circumferential surface of the support sleeve is provided with an assembly ring groove; an annular state is formed between the lower part of the support sleeve and the central tube; the thin circumferential surface of the support sleeve is movably sleeved with a rubber cylinder; a piston sleeve is movably sleeved on the central pipe between the support sleeve and the lower joint; the inner side of the support sleeve is provided with a plurality of support sliding plates through T-shaped sliding grooves in a uniform sliding mode. The packer solves the problems that the existing packer is unstable in sealing performance and easy to lose efficacy, and meets the use requirements of oil fields.

Description

Packer with radial supporting function

Technical Field

The utility model relates to a packer with radial support function belongs to downhole tool technical field.

Background

The packer is a main downhole tool for separate production and injection, separate layer test and control and special operation of the oil field. The existing packer generally completes the sealing action after two ends of a rubber sleeve are pressed and expanded. For example, the utility model discloses a utility model patent application No. 201710912336.9 discloses a packer, when its setting, utilizes hydraulic pressure drive to press the cover and press the cover down, makes it extrude the packing element from both ends, thereby radial expansion extrusion sleeve pipe after the packing element pressurized accomplishes and seals the sleeve pipe. The existing packer adopts a mode that two ends of a rubber cylinder are compressed and radially expanded to complete setting, and the rubber cylinder has the characteristic of easy softening under the working condition of high temperature and high pressure, so that when the existing packer is in the underground environment of high temperature and high pressure, the rubber cylinder is easy to soften and causes the problem of setting failure caused by leakage. In addition, in the process of completing setting by radial expansion under the condition of pressure at two ends of the rubber cylinder, the middle part of the rubber cylinder is only under the condition of pressure at the end part, and the problem of unstable sealing performance caused by non-direct force exists, so that the requirement for use in an oil field can not be met. There is a need to develop a new packer to solve the above problems of the existing packer.

Disclosure of Invention

The utility model aims at: the packer with the radial supporting function is compact in structure and ingenious in design, and solves the problems that the existing packer is unstable in sealing performance and easy to lose effectiveness.

The technical scheme of the utility model is that:

a packer with a radial supporting function comprises a central pipe, an upper joint, a lower joint, a supporting sleeve, a piston sleeve and a rubber sleeve; the method is characterized in that: the upper end of the central pipe is in threaded connection with an upper joint; the lower end of the central pipe is in threaded connection with a lower joint; a support sleeve is fixedly arranged on the central pipe below the upper joint through a fastening screw; the outer part of the support sleeve is of a step-shaped structure; the thin circumferential surface of the support sleeve is provided with an assembly ring groove; an annular state is formed between the lower part of the support sleeve and the central tube; the thin circumferential surface of the support sleeve is movably sleeved with a rubber cylinder; a piston sleeve is movably sleeved on the central pipe between the support sleeve and the lower joint; the upper end of the piston sleeve extends to the interior of an annulus between the support sleeve and the central tube; the piston sleeve is connected with the rubber cylinder in an abutting mode; the inner surface of the lower end of the piston sleeve is connected with the circumferential surface of the lower joint in a sliding and sealing manner; a plurality of supporting sliding plates are uniformly arranged on the inner side of the supporting sleeve in a sliding manner through T-shaped sliding grooves; the supporting sliding plate is connected with the inner wall of the supporting sleeve through a return spring; the inner side of the supporting sliding plate is connected with the upper end of the piston sleeve in a sliding way; a plurality of expanding arc pieces are uniformly distributed on the assembling ring groove of the support sleeve; the diameter expanding arc piece penetrates through the support sleeve and then is fixedly connected with the corresponding support sliding plate; supporting arc strips are arranged on the assembly ring grooves on the two sides of the expanding arc piece; the supporting arc strip is in abutting connection with the expanding arc piece under the action of elastic force of the rubber cylinder; a pressure building annulus is arranged between the lower joint and the central pipe and between the piston sleeve and the central pipe; the pressure-building annulus is communicated with the interior of the central tube through the pressure transmitting hole.

O-shaped sealing rings are arranged between the upper joint and the central pipe and between the lower joint and the central pipe; the interior of the lower joint is of a closed structure.

The piston sleeve is of an integrated structure and consists of an outer sleeve and an inner sleeve; an inner sleeve is arranged in the outer sleeve; one end of the inner sleeve extends to the outer end of the outer sleeve; an extrusion conical surface is arranged on the circumferential surface of the upper end of the inner sleeve extending to the outer end of the outer sleeve; the piston sleeve is connected with the inner side of the supporting sliding plate in a sliding way through an extrusion conical surface; an avoidance ring groove is arranged between the circumferential surface of the inner sleeve and the inner surface of the outer sleeve; the end of the outer sleeve is in abutting connection with the rubber sleeve; the inner sleeve is connected with the central tube in a sliding way; the outer sleeve is connected with the circumferential surface of the lower joint in a sliding and sealing manner.

A plurality of groups of sealing ring grooves are arranged in the inner sleeve; the inner sleeve can be provided with an O-shaped sealing ring through a sealing ring groove; the inner sleeve is connected with the central pipe in a sliding and sealing mode through an O-shaped sealing ring.

The supporting sliding plate is an arc-shaped plate; the inner side of the lower end of the supporting sliding plate is provided with a control inclined plane; the inclination angle of the inclined plane is controlled to be consistent with the inclination angle of the extrusion conical surface of the piston sleeve; the supporting sliding plate is connected with the extrusion conical surface of the piston sleeve in a fitting manner through the control inclined surface; assembly claws are respectively arranged on two sides of the upper end of the supporting sliding plate; the support sliding plate is slidably mounted inside the support sleeve through the assembling claw and the T-shaped sliding groove.

The diameter expanding arc piece consists of a connecting rod and a diameter expanding arc strip; the inner side of the expanding arc strip is provided with a connecting rod; the connecting rod passes through the supporting sleeve and then is fixedly connected with the corresponding supporting sliding plate.

The two end heads of the expanding arc strip are both in a wedge shape; the end heads at the two ends of the supporting arc strip are both in a wedge shape; the end of the expanding arc strip is connected with the end of the corresponding supporting arc strip in a fitting manner.

The utility model has the advantages that:

the packer with the radial supporting function has a compact structure and is ingenious in design; when in setting, the piston sleeve not only can axially extrude the rubber cylinder from two ends under the matching of the supporting sleeve, so that the rubber cylinder can generate radial deformation; the rubber cylinder can be extruded from the inside through the supporting sliding plate, the diameter expanding arc piece and the diameter expanding arc strip to generate radial deformation; therefore, the rubber cylinder can be guided to be intensively deformed at the diameter expanding positions of the diameter expanding arc pieces and the supporting arc strips, and the sealing stability of the rubber cylinder can be enhanced. In addition, after the rubber sleeve is extruded by the diameter-expanding arc pieces and the diameter-expanding arc strips from the inside, outward expansion forces of the diameter-expanding arc pieces and the diameter-expanding arc strips can be transmitted to the set sleeve through the rubber sleeve, so that the deformation resistance of the rubber sleeve is further enhanced, when the rubber sleeve is softened in a high-temperature environment, the outward expansion forces of the diameter-expanding arc pieces and the diameter-expanding arc strips can further extrude the rubber sleeve, the failure risk of the rubber sleeve is reduced, the problems that the existing packer is unstable in sealing performance and easy to fail are solved, and the use requirements of an oil field are met.

Description of the drawings:

fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure in the direction A-A in FIG. 1;

fig. 3 is a schematic structural view of the piston sleeve of the present invention;

fig. 4 is a schematic sectional structure view of the piston sleeve of the present invention;

fig. 5 is a schematic structural view of the support sleeve of the present invention;

FIG. 6 is a schematic view of the structure of the working state of the present invention;

FIG. 7 is a schematic view of the structure in the direction B-B in FIG. 5;

FIG. 8 is an enlarged view of the structure of FIG. 7 at C;

fig. 9 is a schematic structural view of the support slide of the present invention;

fig. 10 is a schematic structural view of the expanding arc member of the present invention.

In the figure: 1. the device comprises a central pipe, 2, an upper joint, 3, a lower joint, 4, a support sleeve, 5, a piston sleeve, 6, a rubber cylinder, 7, an O-shaped sealing ring, 8, a fastening screw, 9, a T-shaped chute, 10, a support sliding plate, 11, a return spring, 12, an assembly ring groove, 13, an expanding arc piece, 14, a support arc strip, 15, a suppressed pressure annulus, 16, a pressure transfer hole, 17, an extrusion conical surface, 18, an outer sleeve, 19, an inner sleeve, 20, an avoiding ring groove, 21, a sealing ring groove, 22, a control inclined surface, 23, an assembly claw, 24, a connecting rod, 25 and an expanding arc strip.

Detailed Description

The packer with the radial supporting function is composed of a central tube 1, an upper joint 2, a lower joint 3, a supporting sleeve 4, a piston sleeve 5 and a rubber sleeve 6.

The upper end of the central tube 1 is connected with an upper joint 2 through threads; an O-shaped sealing ring 7 is arranged between the upper joint 2 and the central pipe 1 (see the attached figure 1 in the specification). The lower end of the central tube 1 is connected with a lower joint 3 through threads; an O-shaped sealing ring 7 is arranged between the lower joint 3 and the central pipe 1 (see the attached figure 1 in the specification).

The inner part of the lower joint 3 is in a closed structure (see the attached figure 1 in the specification); the inner diameter of the lower end of the lower joint 3 is smaller than that of the central tube 1; the purpose of thus arranging the lower joint 3 is: so that in the process of moving the drilling fluid from the central pipe 1 to the lower joint 3 in operation, the flow area of the drilling fluid is reduced, the pressure of the drilling fluid is increased through the throttling expansion principle, and the drilling fluid can provide enough power for setting of the packer.

The central tube 1 below the upper joint 2 is fixedly provided with a support sleeve 4 through a fastening screw 8 (see the attached figure 1 in the specification).

The outer part of the supporting sleeve 4 is in a step-shaped structure (see the description and the attached figure 5); the thin circumferential surface of the support sleeve 4 is provided with an assembly ring groove 12 (see the attached figure 5 in the specification); the lower part of the support sleeve 4 is in an annular state with the central tube 1 (see the attached figure 8 in the specification).

The thin circumferential surface of the support sleeve 4 is movably sleeved with a rubber cylinder 6 (see the attached figure 8 of the specification); the upper end surface of the rubber cylinder 6 is connected with the stepped surface of the supporting sleeve 4 in an abutting mode.

A plurality of supporting sliding plates 10 are uniformly and slidably arranged on the inner side of the supporting sleeve 4 through a T-shaped sliding groove 9 (see the attached figure 8 in the specification); the supporting sliding plate 10 is an arc-shaped plate (see the attached figures 9 and 5 in the specification); the lower end of the support slide 10 is provided with a control ramp 22 on the inside (see figures 8 and 9 of the specification).

The two sides of the upper end of the supporting sliding plate 10 are respectively provided with an assembling claw 23 (refer to the attached figure 9 in the specification); the purpose of thus arranging the fitting claws 23 is to: so that the support sliding plate 10 can be slidably mounted inside the support sleeve 4 through the assembly claw 23 and the T-shaped chute 9; when the support slide plate 10 is stressed, the support slide plate can only move along the radial direction at the inner side of the support sleeve 4 under the guidance of the T-shaped sliding groove 9, so that the problems of deviation of the running track and derailment of the support slide plate 10 can be avoided.

The supporting slide plate 10 and the inner wall of the supporting sleeve 4 are mutually connected through a return spring 11 (see the attached figure 8 in the specification); under the action of the elastic force of the return spring 11, the support sliding plate 10 always has the tendency of moving inwards, so that the support sliding plate can be always attached to the piston sleeve 5, and the purpose of controlling the movement of the support sliding plate 10 can be achieved when the piston sleeve 5 moves up and down.

A plurality of expanding arc pieces 13 are uniformly distributed on the assembly ring groove 12 of the support sleeve 4 (see the attached figures 5 and 8 of the specification). The expanding arc piece 13 is composed of a connecting rod 24 and an expanding arc strip 25 (see the attached figure 10 in the specification); the inner side of the expanding arc strip 25 is provided with a connecting rod 24; the connecting rod 24 passes through the support sleeve 4 and is fixedly connected with the corresponding support sliding plate 10 (see the attached figures 2 and 7 in the specification). The supporting sliding plate 10 can be fixedly connected with the diameter expanding arc piece 13; when the supporting sliding plate 10 acts, the expanding arc piece 13 can be driven to act synchronously.

Supporting arc strips 14 are arranged on the assembly ring grooves 12 on two sides of the expanding arc piece 13 (see the attached figures 2 and 7 in the specification); the supporting arc strips 14 are in abutting connection with the expanding arc pieces 13 under the action of the elastic force of the rubber cylinder 6.

The two ends of the expanding arc strip 25 are both in a wedge shape; the two ends of the supporting arc strip 14 are both in a wedge shape; the end of the expanding arc strip 25 is in fit connection with the end of the corresponding supporting arc strip 14 (see the attached figures 2 and 7 in the specification). The purpose that the two ends of the expanding arc strip 25 and the supporting arc strip 14 are both arranged in a wedge shape is as follows: when the diameter-expanding arc strips 25 are radially expanded outwards, the diameter-expanding arc strips 25 can synchronously push the supporting arc strips 14 to be expanded through the wedge-shaped surfaces (see the attached figure 7 in the specification); therefore, the purpose that the diameter expanding arc strip 25 and the supporting arc strip 14 synchronously act and the rubber tube 6 can be propped open from the inside during setting can be achieved.

A piston sleeve 5 is movably sleeved on the central tube 1 between the support sleeve 4 and the lower joint 3 (see the attached figure 1 in the specification); the piston sleeve 5 is forced to move up and down along the central tube 1.

The piston sleeve 5 is of an integrated structure (see the description and the attached figure 3), and is composed of an outer sleeve 18 and an inner sleeve 19.

An inner sleeve 19 is arranged in the outer sleeve 18; one end of the inner sleeve 19 extends to the outer end of the outer sleeve 18; the upper circumferential surface of the inner sleeve 19 extending to the outer end of the outer sleeve 18 is provided with a pressing tapered surface 17. The upper end of the inner sleeve 19 extends to the interior of the annulus between the support sleeve 4 and the base pipe 1 (see figure 8 of the specification).

The piston sleeve 5 is attached to the control inclined surface 22 of the support sliding plate 10 through the extrusion conical surface 17; the inclination angle of the pressing cone 17 of the piston sleeve 5 corresponds to the inclination angle of the control ramp 22. Thus, when the piston sleeve 5 moves upwards, the supporting sliding plate 10 can be pushed to move outwards gradually by the control inclined plane 22; when the piston sleeve 5 moves downwards, the support sliding plate 10 can gradually retract under the action of the elastic force of the return spring 11.

An avoidance ring groove 20 is arranged between the circumferential surface of the inner sleeve 19 and the inner surface of the outer sleeve 18 (see the description of the attached figure 3); the avoiding ring groove 20 is arranged opposite to the lower end surface of the support sleeve 4; the purpose of thus providing the avoiding ring groove 20 is: so that the support sleeve 4 can be inserted into and connected with the avoiding ring groove 20 in the process of moving the piston sleeve 5 upwards, thereby avoiding the problem that the support sleeve 4 blocks the movement of the piston sleeve 5.

The end of the outer sleeve 18 is connected with the rubber cylinder 6 in an interference mode; the inner sleeve 19 is connected with the central tube 1 in a sliding way; the outer sleeve 18 is connected with the circumferential surface of the lower joint 3 in a sliding and sealing mode (see the description and the attached figure 1). When the piston sleeve 5 moves upwards, the rubber sleeve 6 can be extruded through the outer sleeve 18, and the purpose of setting the rubber sleeve is achieved.

The inner part of the inner sleeve 19 is provided with a plurality of groups of sealing ring grooves 21 (see the description and the attached figure 4); the inner sleeve 19 can be provided with an O-shaped sealing ring 7 through a sealing ring groove 21; the inner sleeve 19 is connected with the central tube 1 in a sliding and sealing way through an O-shaped sealing ring 7. The purpose of the provision of the sealing ring groove 21 is: the sealing performance between the piston sleeve 5 and the central pipe 1 is enhanced through an O-shaped sealing ring 7, so that the problem of pressure relief when the packer is set is avoided.

A pressure building annulus 15 is arranged between the lower joint 3 and the central pipe 1 and between the piston sleeve 5 and the central pipe 1; the pressure-building annulus 15 is communicated with the interior of the central tube 1 through a pressure transmitting hole 16 (see the attached figures 1 and 6 of the specification). The purpose of setting the pressure transmitting hole 16 and the pressure-building annulus 15 is as follows: so that when setting, the drilling fluid in the central tube 1 can enter the pressure-holding annulus 15 through the pressure transfer hole 16 to push the piston sleeve 5 to act, and further the purpose of controlling the action of the piston sleeve 5 is achieved.

When the packer with the radial supporting function works, a pressurizing sliding sleeve (the pressurizing sliding sleeve is a common underground component) needs to be installed in the inner cavity of the lower joint 3, and then the packer is fixed after being put to a specified position.

After the packer is fixed, when setting is needed, drilling fluid with certain pressure is injected into the central tube 1. After the drilling fluid enters the central tube 1, a part of the drilling fluid is discharged outside after passing through the pressurizing sliding sleeve and the lower connector 3, and a part of the drilling fluid enters the pressure-building annulus 15 through the pressure transmitting hole 16. The drilling fluid entering the suppressed pressure annulus 15 pushes the piston sleeve 5 to move upwards along the central pipe 1 under the action of the self pressure.

In the process that the piston sleeve 5 moves upwards, the rubber cylinder 6 is extruded from two ends under the matching of the support sleeve 4, and the rubber cylinder 6 generates radial deformation after being pressed, so that the setting is completed. Meanwhile, during the upward movement of the piston sleeve 5, the support slide 10 is pushed by the pressing conical surface 17 and the control inclined surface 22 to gradually move outward against the elastic force of the return spring 11. The supporting sliding plate 10 drives the diameter expanding arc pieces 13 to synchronously move outwards in the outward moving process, and the supporting arc strips 14 are pushed to synchronously open through the wedge-shaped surfaces of the diameter expanding arc strips 25 in the outward moving process of the diameter expanding arc pieces 13. The supporting arc strips 14 can be synchronously unfolded under the coordination of the expanding arc strips 25, and the expanding arc pieces 13 and the supporting arc strips 14 can extrude the rubber cylinders 6 from the inside to be radially unfolded in the unfolding process, so that the aim of 'setting' is fulfilled.

So that the piston sleeve 5 moves to the uppermost position when the piston sleeve 5 moves upwards into abutment with the support sleeve 4. At this time, the end faces of the expanding arc piece 13 and the expanding arc strip 25 are completely overlapped to form a complete circular ring body (see the attached figure 7 in the specification), and the rubber cylinder 6 radially deforms to the maximum under the action of the internal pressure and the pressures at the two ends, so that the setting is completed. And then, continuously pressurizing the central pipe 1 until the pressure in the central pipe 1 exceeds the limit of the pressurizing sliding sleeve, and the pressurizing sliding sleeve falls out of the inner cavity of the lower joint 3 to form a production channel of the oil pipe and the casing. At this moment, because the inner diameter of the lower joint 3 is smaller than that of the central pipe 1, and the inner diameter of the lower joint 3 gradually becomes smaller, under the action of the throttling expansion principle, the drilling fluid flowing into the pressure-holding annulus 15 through the pressure transmission hole 16 can keep the pressure on the piston sleeve 5, and therefore the setting force of the packer is guaranteed.

When the packer needs to be unsealed, the pumping of drilling fluid into the central tube 1 is stopped, and the piston sleeve 5 is restored to the original position under the action of gravity; the support sliding plate 10 is reset under the action of a reset spring 11; the supporting arc strips 14 are reset under the action of the elastic force of the rubber cylinder 6; the packer can accomplish the deblocking after packing element 6 resets, and this packer can put into next circulation afterwards.

When the piston sleeve 5 axially compresses the rubber sleeve 6 during the operation of the packer, the supporting arc strips 14 and the expanding arc pieces 13 synchronously extrude the rubber sleeve 6 from the inside, so that the rubber sleeve 6 can be guided to be intensively deformed at the expanding positions of the expanding arc pieces 13 and the supporting arc strips 14, the purpose of enhancing the sealing stability of the rubber sleeve 6 is achieved, and the problem of unstable sealing performance existing in the existing packer is solved. In addition, when the rubber sleeve 6 is softened in a high-temperature environment, the outward expansion force of the diameter expansion arc pieces 13 and the diameter expansion arc strips 25 can further extrude the rubber sleeve 6, so that the failure risk of the rubber sleeve 6 is reduced, the problems that the existing packer is unstable in sealing performance and easy to fail are solved, and the use requirements of an oil field are met.

Claims

1. A packer with a radial supporting function is composed of a central pipe (1), an upper joint (2), a lower joint (3), a supporting sleeve (4), a piston sleeve (5) and a rubber sleeve (6); the method is characterized in that: the upper end of the central pipe (1) is connected with an upper joint (2) in a threaded manner; the lower end of the central pipe (1) is connected with a lower joint (3) in a threaded manner; a support sleeve (4) is fixedly arranged on the central tube (1) below the upper joint (2) through a fastening screw (8); the outer part of the support sleeve (4) is of a step-shaped structure; the thin circumferential surface of the support sleeve (4) is provided with an assembly ring groove (12); an annular state is formed between the lower part of the support sleeve (4) and the central pipe (1); the thin circumferential surface of the support sleeve (4) is movably sleeved with a rubber cylinder (6); a piston sleeve (5) is movably sleeved on the central tube (1) between the support sleeve (4) and the lower joint (3); the upper end of the piston sleeve (5) extends to the interior of an annulus between the support sleeve (4) and the central tube (1); the piston sleeve (5) is in abutting connection with the rubber cylinder (6); the inner surface of the lower end of the piston sleeve (5) is connected with the circumferential surface of the lower joint (3) in a sliding and sealing way; a plurality of supporting sliding plates (10) are uniformly arranged on the inner side of the supporting sleeve (4) in a sliding manner through a T-shaped sliding chute (9); the supporting sliding plate (10) is connected with the inner wall of the supporting sleeve (4) through a return spring (11); the inner side of the supporting sliding plate (10) is connected with the upper end of the piston sleeve (5) in a sliding way; a plurality of expanding arc pieces (13) are uniformly distributed on the assembly ring groove (12) of the support sleeve (4); the diameter expanding arc piece (13) penetrates through the support sleeve (4) and then is fixedly connected with the corresponding support sliding plate (10); supporting arc strips (14) are arranged on the assembly ring grooves (12) on the two sides of the diameter-expanding arc piece (13); the supporting arc strips (14) are in abutting connection with the expanding arc pieces (13) under the action of the elastic force of the rubber cylinder (6); a pressure building annulus (15) is arranged between the lower joint (3) and the central pipe (1) and between the piston sleeve (5); the pressure-building annulus (15) is communicated with the interior of the central tube (1) through a pressure transmitting hole (16).

2. The packer with the radial supporting function as claimed in claim 1, wherein: o-shaped sealing rings (7) are arranged between the upper joint (2) and the central pipe (1) and between the lower joint (3) and the central pipe (1); the interior of the lower joint (3) is in a closing-up structure.

3. The packer with the radial supporting function as claimed in claim 1, wherein: the piston sleeve (5) is of an integrated structure and consists of an outer sleeve (18) and an inner sleeve (19); an inner sleeve (19) is arranged in the outer sleeve (18); one end of the inner sleeve (19) extends to the outer end of the outer sleeve (18); an extrusion conical surface (17) is arranged on the circumferential surface of the upper end of the inner sleeve (19) extending to the outer end of the outer sleeve (18); the piston sleeve (5) is connected with the inner side of the support sliding plate (10) in a sliding way through an extrusion conical surface (17); an avoidance ring groove (20) is arranged between the circumferential surface of the inner sleeve (19) and the inner surface of the outer sleeve (18); the end of the outer sleeve (18) is in interference connection with the rubber cylinder (6); the inner sleeve (19) is connected with the central tube (1) in a sliding way; the outer sleeve (18) is connected with the circumferential surface of the lower joint (3) in a sliding and sealing way.

4. A packer with radial support function according to claim 3, characterized in that: a plurality of groups of sealing ring grooves (21) are arranged in the inner sleeve (19); the inner sleeve (19) can be provided with an O-shaped sealing ring (7) through a sealing ring groove (21); the inner sleeve (19) is connected with the central tube (1) in a sliding and sealing way through an O-shaped sealing ring (7).

5. A packer with radial support function according to claim 3, characterized in that: the supporting sliding plate (10) is an arc-shaped plate; a control inclined plane (22) is arranged on the inner side of the lower end of the support sliding plate (10); the inclination angle of the inclined plane (22) is controlled to be consistent with the inclination angle of the extrusion conical surface (17) of the piston sleeve (5); the supporting sliding plate (10) is attached to and connected with the extrusion conical surface (17) of the piston sleeve (5) through a control inclined surface (22); two sides of the upper end of the supporting sliding plate (10) are respectively provided with an assembling claw (23); the support sliding plate (10) is slidably arranged inside the support sleeve (4) through the assembling claw (23) and the T-shaped sliding groove (9).

6. The packer with the radial supporting function as claimed in claim 1, wherein: the diameter-expanding arc piece (13) is composed of a connecting rod (24) and a diameter-expanding arc strip (25); the inner side of the expanding arc strip (25) is provided with a connecting rod (24); the connecting rod (24) passes through the supporting sleeve (4) and then is fixedly connected with the corresponding supporting sliding plate (10).

7. The packer with the radial supporting function as claimed in claim 6, wherein: the two ends of the expanding arc strip (25) are both in a wedge shape; the end heads at the two ends of the supporting arc bar (14) are in a wedge shape; the end of the expanding arc strip (25) is jointed and connected with the end of the corresponding supporting arc strip (14).