CN220522533U - Hydraulic swabbing blowout preventer - Google Patents

Abstract

The utility model relates to the technical field of wellhead blowout preventers, in particular to a hydraulic swabbing blowout preventer. The utility model provides a hydraulic pressure swabbing blowout preventer, including outer barrel, install first gluey core in the urceolus is internal in proper order, pressure transmission spare and second glue the core, the three all has the through-hole that corresponds of axial and form the wire rope and pass through the wire rope, first gluey core is stopped by outer barrel in the direction of keeping away from the second gluey core, still sliding seal installs the driving piston in the urceolus, driving piston its relative urceolus axial displacement, be connected with the axial pressure piece that the one end of keeping away from first gluey core of promotion second gluey core moved towards first gluey core axial on the driving piston, when the piston moves towards first gluey core, extrude second gluey core, pressure transmission spare and first gluey core in proper order through axial pressure piece axial, promote first, radial deformation of second gluey core hug tightly wire rope. The advantages are that: the utility model has simpler structure, easier manufacture and installation and difficult occurrence of faults.

Description

Hydraulic swabbing blowout preventer

Technical Field

The utility model relates to the technical field of wellhead blowout preventers, in particular to a hydraulic swabbing blowout preventer.

Background

In the process of pumping oil and gas fields, a steel wire rope pumping device is usually adopted. In order to prevent gas and liquid in the well from being sprayed out, affecting the measured value and preventing corrosion to working equipment, a wire rope pumping blowout preventer needs to be arranged at a wellhead. Existing blowout preventers are generally divided into two categories: mechanical blowout preventer and hydraulic blowout preventer. The mechanical blowout preventer is characterized in that a plurality of sealing rubber blocks are additionally arranged in an annular space of the blowout preventer, and a pressing cap with a handle is arranged at the upper end of the mechanical blowout preventer to press the sealing rubber blocks, so that when a steel wire rope moves up and down, the sealing rubber blocks are axially pressed to deform, and the sealing rubber blocks are always tightly held by the steel wire rope to prevent liquid from leaking. In the actual operation process, the surface of the steel wire rope is quite rough, the sealing rubber block is invalid after being rubbed with the steel wire rope for a long time, the steel wire rope only needs to be sealed in the upward direction, and the sealing rubber block is not required to be sealed in the downward direction, but the mechanical blowout preventer is used for enabling the sealing rubber block to hold tightly to the steel wire rope all the time, and ineffective abrasion can be generated on the sealing rubber block in the descending process of the steel wire rope, so that the service life of the sealing rubber block is greatly shortened. Because of the problems of large abrasion and short service life of the mechanical sealing device, the hydraulic blowout preventer is generated.

The working principle of the hydraulic blowout preventer is that a set of hydraulic cylinders are arranged at the lower ends of the sealing rubber blocks, when the steel wire ropes are put down, the hydraulic switches are not opened, the pistons are not moved, the sealing rubber blocks are not deformed, and the steel wire ropes are normally and rapidly put down; when the steel wire rope is lifted, the hydraulic switch is started, the hydraulic cylinder ring piston moves upwards to squeeze the sealing rubber block, and the sealing rubber block is deformed by axial pressure to squeeze and hold the steel wire rope tightly.

The patent with application publication number CN115075766 discloses a hydraulic blowout preventer, which comprises the following structure: a piston is arranged, and moves upwards when the pressure is applied; the piston axially pushes the push rods, the plurality of push rods drive the sealing rubber blocks to walk along the arc-shaped track, and the end parts of the plurality of sealing rubber blocks are integrated into a closed ring-shaped structure to hold the steel wire rope tightly; meanwhile, the piston radially pushes against the protective block, the protective block is connected with a blowout-preventing rubber core, and after a plurality of protective blocks are gathered, the blowout-preventing rubber core encloses a closed annular area; each push rod and each protection block are provided with a reset spring, and after the pressurization is canceled, the reset springs pull the push rods and the protection blocks to return to the original positions. The defects are that: the whole structure is complex, the parts are more, and the fault is easy to occur: if the spring is not reset thoroughly or can not be reset, the anti-spraying rubber core or the sealing rubber block is disconnected, so that the device is invalid and the like.

Disclosure of Invention

The utility model aims to provide a novel hydraulic swabbing blowout preventer to solve the problem that the structure of the existing swabbing blowout preventer is relatively complex.

In order to solve the problems, the technical scheme in the utility model is as follows:

the utility model provides a hydraulic pressure swabbing blowout preventer, including outer barrel, install first gluey core in the urceolus is internal in proper order, pressure transmission spare and second gluey core, the three all has the through-hole that corresponds of axial and form the wire rope and pass through the wire rope, first gluey core is kept away from the second gluey core by outer barrel in the orientation that keeps away from the second gluey core, still sliding seal installs the drive piston in the urceolus, the drive piston disposes the hydraulic circuit that drives its relative urceolus axial displacement, be connected with the axial pressure piece that promotes the one end of keeping away from first gluey core of second gluey core towards first gluey core axial displacement on the drive piston, and when the piston moves towards first gluey core, extrude second gluey core, pressure transmission spare and first gluey core in proper order through axial pressure piece axial, promote first, the radial inwards shrink deformation of second gluey core embraces wire rope.

The advantages are that: according to the utility model, the sealing element, namely the first rubber core and the second rubber core, are integrated, and the first rubber core and the second rubber core are extruded in the axial direction when the driving piston acts, so that the structure is simpler, the manufacturing and the installation are easier, the extrusion of the first rubber core and the second rubber core is more stable and reliable, and faults such as sealing failure and the like are not easy to occur.

Further, the outer cylinder body is provided with a piston cavity formed by outwards sinking in the radial direction at the position corresponding to the pressure transmission part, the driving piston comprises a pipe body part and an annular flange arranged on the outer peripheral surface of the pipe body part, the annular flange stretches into the piston cavity and is in sealing sliding fit with the inner wall of the piston cavity, and two ends of the pipe body part are in sliding sealing fit with two side ports of the piston cavity in the axial direction.

The advantages are that: the piston and the piston cavity in the structural form are connected with the pressure transmission part through a simple structure, the manufacturing cost is low, and meanwhile, the piston is directly linked with the pressure transmission part to act, so that the operation is convenient.

Further, a reset spring for resetting the driving piston in a direction away from the first rubber core is arranged on one side, close to the first rubber core, of the annular flange in the piston cavity, and one end, away from the first rubber core, of the piston cavity is connected with a hydraulic oil circuit.

The advantages are that: the spring is matched with the unidirectional oil way, so that the pressure relief is automatically reset, and the oil way is simplified.

Further, the outer barrel is of an axially spliced segmented structure and comprises a first segment, a second segment and a third segment, a radial outer flange is arranged at the end part of the first segment, facing the second segment, of the second segment, the second segment comprises a barrel part and a radial inner flange, a piston cavity is formed between the radial outer flange and the radial inner flange after the first segment and the second segment are connected, and the barrel part is in sliding sealing fit with the inner side surfaces of the radial outer flange and the radial inner flange respectively.

The advantages are that: the outer cylinder body is divided into three parts, so that the manufacturing and the installation are convenient.

Further, one end of the pressure transmission member is in sliding fit with the inner wall of the first section, the pipe body portion is sleeved on the outer side of the pressure transmission member in a sliding mode, and the axial pressurizing member is connected to the end portion, far away from the first rubber core, of the pipe body portion.

The advantages are that: the pressure transmission piece is in sliding fit with the inner wall of the first section, so that stability and reliability of the pressure transmission piece during pressing during axial movement are guaranteed, meanwhile, the pressure transmission piece is compact in structure, and the size of the whole device is reduced as much as possible.

Further, an inclined surface which promotes the first rubber core to deform inwards during axial extrusion is arranged at the position of the outer cylinder blocked by the first rubber core and/or the position of the pressure transmission piece which is in pressing contact with the first rubber core.

The advantages are that: the inclined plane is arranged to better extrude the first rubber core, so that the first rubber core is easier to radially deform.

Further, a pressing cap is arranged between the second rubber core and the pressure transmission part, and the pressing cap is provided with an inclined surface which is used for promoting the second rubber core to deform inwards when being axially extruded on one side contacted with the second rubber core.

The advantages are that: the installation of a return spring, a driving piston and the like is facilitated by the pressure cap which is arranged independently of the pressure transmission member, and the second rubber core can be extruded better.

Further, the axial pressing member has a slope surface on a side contacting the second rubber core, which urges the second rubber core to deform inward upon axial pressing.

The advantages are that: the axial pressurizing piece can better squeeze the second rubber core, so that the second rubber core is easier to radially deform.

Further, the oil pipe connecting sleeve comprises an oil pipe connecting sleeve, a pin groove is formed in one end, far away from the first rubber core, of the outer cylinder body, and the oil pipe connecting sleeve is fixedly connected with the outer cylinder body through a safety shearing pin inserted in the pin groove.

The advantages are that: when the pumping accident occurs, the pumping tool impacts the device, and when the shearing stress of the safety shearing pin is reached, the safety shearing pin is sheared, so that the part of the pumping device is separated from the oil pipe connecting sleeve and is lifted out of the wellhead along with the lifting tool, and the pumping tool is prevented from entering the well accident caused by the breaking and the separation of the pumping steel wire rope.

Drawings

Fig. 1 is a schematic structural diagram of a pumping blowout preventer according to an embodiment of the present utility model.

In the figure: 1. a first glue core seat; 2. a first rubber core; 3. a pressure transmission member; 4. a 0-type seal ring; 5. a first connection sleeve; 6. a 0-type seal ring; 7. an intermediate connecting sleeve; 1301. a first piston chamber; 1302. a second piston chamber; 131. a tube body portion; 1311. a first piston tube; 1312. a second piston tube; 8. a return spring; 9. a 0-type seal ring; 10. an oil pressure joint; 11. a 0-type seal ring; 12. a second connecting sleeve; 13. an annular flange; 14. an O-shaped sealing ring; 15. pressing the cap; 16. a second rubber core; 17. a second glue core seat; 18. safety shearing pins; 19. a 0-type seal ring; 20. an oil pipe connector; 2001. a connecting thread; 2002. a pin hole; 2003. and limiting the step.

Detailed Description

The features and capabilities of the present utility model are described in further detail below in connection with the examples.

In a first embodiment of the present utility model:

as shown in fig. 1: a hydraulic pumping blowout preventer comprises an outer cylinder and an oil pipe connecting sleeve 20. The outer cylinder body is of an axially spliced three-section structure and comprises a first section, a second section and a third section, and the outer cylinder body is divided into three parts for convenient manufacture and convenient installation. The first section comprises a first rubber core 2, the second section comprises a pressure transmission part 3, and the third section comprises a second rubber core 16, which are provided with through holes corresponding to each other in the axial direction to form a rope threading channel for a steel wire rope to pass through.

The first segment further comprises: a first core print 1 and a first connecting sleeve 5. The first rubber core seat 1 is of a barrel-shaped structure with a central hole, and the barrel bottom is provided with an inclined plane matched with the first rubber core 2. The first core print 1 forms a stop fit with the first core print 2 in a direction away from the second core print 16. The first rubber core 2 is of a cylindrical structure with a middle hole, and inclined surfaces which promote the first rubber core 1 to deform inwards during axial extrusion are arranged at the position blocked by the first rubber core seat 1 and the position in pressing contact with the pressure transmission piece 3. The inclined surfaces are arranged at the position blocked by the first rubber core seat 1 and the position in pressing contact with the pressure transmission piece 3, so that the first rubber core can be better extruded, and the first rubber core is easier to shrink and deform radially inwards. One end of the first connecting sleeve 5 is in threaded connection with the edge of the barrel opening of the first rubber core seat, and sealing between the first rubber core seat 1 and the first connecting sleeve 5 is realized through an O-shaped sealing ring 4; the other end of the first connecting sleeve 5 is in threaded connection with the second section middle connecting sleeve 7.

The pressure transmission member spans the first segment and the second segment. The pressure transmission part 3 is of a hollow step cylinder structure, one part of the pressure transmission part 3 is of a large-diameter cylinder and is in sliding fit with the first part and is in pressing contact with the first rubber core, the other part of the pressure transmission part 3 is of a small-diameter cylinder, the pressure transmission part 3 is in sliding fit with the inner wall of the first section, stability and reliability of the pressure transmission part during pressing by axial movement are guaranteed, meanwhile, the compactness of the structure is guaranteed, and the size of the whole device is reduced as much as possible. The second section is also provided with a middle connecting sleeve 7 and a driving piston 13. The second section is provided with a piston cavity formed by outwards sinking radially at the position corresponding to the pressure transmission part 3, the driving piston 13 comprises a pipe body part 131 and an annular flange arranged on the outer peripheral surface of the pipe body part 131, the annular flange stretches into the piston cavity and is in sealing sliding fit with the inner wall of the piston cavity, the annular flange is sealed with the inner wall of the piston cavity through an O-shaped sealing ring 9, two ends of the pipe body part 131 are in sliding sealing fit with two axial side ports of the piston cavity, and the pipe body part 131 of the driving piston 13 is sleeved outside a small-diameter cylinder part of the pressure transmission part 3 in a sliding mode. The driving piston body portion 131 includes a first piston tube 1311 and a second piston tube 1312. The first piston tube 1311 extends into the inner hole of the first connecting sleeve 5, and the first piston tube 1311 and the upper connecting sleeve are sealed by an O-shaped sealing ring 6; the tubular body portion 131 of the driving piston 13 is connected at the end remote from the first rubber core to an axial pressure element in the third segment by means of a second piston tube 1312. The piston and the piston cavity with the structure are simple in structure and are connected with the pressure transmission piece 3, and meanwhile, the driving piston 7 directly acts in a linkage way with the pressure transmission piece 3, so that the operation is convenient.

The piston cavity is provided with a return spring 8 for resetting the driving piston 7 in a direction away from the first rubber core 2 at one side of the annular flange, namely the first piston cavity 1301, which is close to the first rubber core 2, one end of the return spring 8 is limited by the annular flange, and the other end is limited by the first connecting sleeve 5. The end of the piston cavity far away from the first rubber core 2, namely the second piston cavity 1302, is provided with an oil pressure connector 10, and the oil pressure connector 10 is connected with a hydraulic oil way. The hydraulic oil path is a one-way oil path and is connected with a manual hydraulic pump, and the second piston cavity 1302 is sealed with the pipe body part 131 through the O-shaped sealing ring 14. The driving piston 13 adopts the cooperation of spring and one-way oil circuit, and when the pressure release, the driving piston 13 automatic re-setting drives axial pressure piece simultaneously, and second rubber core 16, press cap 15, pressure transmission piece 3 reset, release the axial extrusion force of applying first second rubber core, reset spring 8 cooperatees with one-way oil circuit, has played the effect of simplifying the oil circuit.

The third segment further comprises: a second connection sleeve 12. The second connecting sleeve is internally provided with a pressing cap 15 and an axial pressing piece. A pressing cap 15 is arranged between the second rubber core 16 and the pressure transmission piece 3, one end of the pressing cap 15, which is contacted with the pressure transmission piece 3, is flat, and an inclined surface which is used for promoting the second rubber core to deform inwards during axial extrusion is arranged at one end, which is contacted with the second rubber core 16. The press cap provided independently of the pressure transmission member plays a role in facilitating the installation of the return spring 8, the driving piston 7, etc., and also plays a role in better pressing the second rubber core 16. The second core is a 16-medium hole cylindrical structure. The axial pressing member, i.e., the second core print 17, is a barrel-like structure having a center hole, and has a slope surface on a side contacting the second core 16, i.e., a barrel bottom, for causing the second core to deform inward upon axial pressing. The second rubber core seat 17 is provided with an inclined plane, so that the second rubber core 16 can be better extruded, and the second rubber core 16 is easier to radially deform. The second die pad 17 is connected to the body portion 131 by a second piston tube 1312 on the body portion 71. The second connecting sleeve 12 has a barrel-like structure with a central hole. An external connecting thread is arranged at one end of the second connecting sleeve 12, which is close to the direction of the first rubber core 2, is in threaded connection with the second section middle connecting sleeve 7 and is sealed by an O-shaped sealing ring 11; the inner hole of the second connecting sleeve 12 is matched with the second rubber core seat 17 to form a stop structure in the direction far away from the first rubber core; the outer peripheral surface is matched with the oil pipe connecting sleeve 20, pin holes 2002 are formed in the outer peripheral surface, and the outer peripheral surface is fixedly connected with the oil pipe connecting sleeve 20 through the matching of the pin holes 2002 and the safety shearing pins 18.

The oil pipe connecting sleeve 20 is of a structure with a central hole, an inner hole close to the outer cylinder is a smooth matching surface, a limiting step 2003 is arranged at the tail end of the matching surface, the outer cylinder is limited, and the outer cylinder can be quickly fixed during installation, so that the pin holes 2002 are quickly aligned, and the safety shearing pin 18 is installed. A pin hole 2002 is formed in one side, close to the outer cylinder, of the oil pipe connecting sleeve 20, and is matched with the safety shearing pin 18 to realize the connection between the oil pipe connecting sleeve and the outer cylinder, and the oil pipe connecting sleeve 20 and the outer cylinder are sealed through an O-shaped sealing ring 19; the other end is provided with a connecting thread 2001 which is connected with the wellhead lubricator. When the pumping accident occurs and the pumping tool impacts the device, the safety shearing pin shears when the shearing stress of the safety shearing pin is reached, so that the outer cylinder body part is separated from the oil pipe connecting sleeve 20 and the pumping tool is lifted out of the wellhead along with the lifting tool, and the pumping tool is prevented from entering the well accident caused by the breaking and the separation of the pumping steel wire rope.

As shown in fig. 1, when the utility model is used, the steel wire rope firstly passes through the inner hole of the first rubber core seat 1, passes through the rope threading channel, and passes out of the inner hole of the lower joint 20 and is connected with the pumping tool. After the pumping tool is placed into the wellhead lubricator, the lower connector is connected with the lubricator through lower threads 2001 and upper threads of the lubricator. The manual hydraulic pump is connected to the hydraulic connector 10 outside the drive piston 7.

When the pumping tool reaches the pumping depth and performs the pumping operation, the manual pump is operated to pump the pump liquid, the pump liquid enters the driving piston 7 through the oil pressure connector 10, the annular flange 13 is pushed to move upwards and push the reset spring 8 to compress, the annular flange 13 drives the second piston tube 712 to drive the second rubber core seat 17 to move upwards and push the second rubber core 16 and the pressing cap 15, and the middle support seat 3 moves upwards to squeeze the first rubber core 2. Since the first core print 1 is fixed, the first core 2 is deformed. Finally, the first rubber core 2 and the second rubber core 16 are deformed in a linkage way, so that proper two-stage sealing is realized. The sealing degree can be controlled by a manual hydraulic pump, so that good sealing in the operation process is ensured, and the effect of preventing liquid from being sprayed out is achieved.

When the pumping tool is lowered, the pressure of the manual pump is released, the annular flange 13 is retracted under the action of the return spring 8, the first rubber core 2 and the second rubber core 16 are decompressed, and the dynamic sealing is realized, so that unnecessary abrasion of the steel wire rope and the upper rubber core and the lower rubber core is reduced. With the increase of the number of the pumping operations, when the first rubber core 2 and the second rubber core 16 cannot tightly hold the pumping rope due to abrasion, and sealing cannot be achieved, the rubber cylinder can be continuously compressed by adjusting the working pressure of the hydraulic system, so that sealing is achieved. When the rubber core is worn to a certain extent and sealing still cannot be achieved under the action of pressure, a new rubber cylinder needs to be replaced.

During the pumping operation, if the pumping speed is too high or the depth marks of the steel wire rope are disordered, so that the pumping tool impacts the bottom of the utility model, the safety shearing pin 18 is sheared under the action of upward impact force, so that the outer cylinder of the tool is separated from the oil pipe connecting sleeve 20 and is lifted out of the wellhead along with the lifting tool, and the pumping tool is prevented from entering the well due to the broken and separated steel wire rope.

In a second embodiment of the present utility model: the difference between this embodiment and the first embodiment is that: the outer cylinder body is formed by the second part and the third part into a whole.

A third embodiment of the present utility model: the difference between this embodiment and the first embodiment is that: the outer cylinder body is not provided with inclined planes at the position blocked by the first rubber core and the position of the pressure transmission part in pressing contact with the first rubber core. And the manufacturing steps are reduced without the inclined plane, so that the cost is saved.

Fourth embodiment of the present utility model: the difference between this embodiment and the first embodiment is that: the second rubber core and the pressure transmission piece are not provided with a pressure cap, the pressure transmission piece is in direct contact with the second rubber core, one side of the pressure transmission piece, which is in contact with the second rubber core, is not provided with an inclined plane and/or the axial pressure piece is not provided with an inclined plane at one side of the pressure transmission piece, which is in contact with the second rubber core.

Fifth embodiment of the present utility model: the difference between this embodiment and the first embodiment is that: the hydraulic device is an electric hydraulic pump. The pressure does not depend on manual adjustment, thus saving manpower.

Embodiment six of the present utility model: the difference between this embodiment and the first embodiment is that: the outer cylinder body is provided with a pin groove at one end far away from the first rubber core, and the oil pipe connecting sleeve is fixedly connected with the outer cylinder body through a pin inserted in the pin groove.

Embodiment seven of the present utility model: the difference between this embodiment and the first embodiment is that: the driving piston is arranged on one side of the axial pressure part far away from the first rubber core, and when the driving piston is used for pressurizing, the driving piston directly axially extrudes the axial pressure part to push the second rubber core and the pressure cap, and the middle support seat moves upwards to extrude the first rubber core, so that the first rubber core and the second rubber core are deformed in a linkage way.

Eighth embodiment of the present utility model: the difference between this embodiment and the first embodiment is that: and a hydraulic oil way is connected to one side of the annular flange, which is close to the first rubber core, and one side of the piston cavity, which is far away from the first rubber core. When one side of the piston cavity far away from the first rubber core is pressurized, the first rubber core and the second rubber core shrink inwards to deform radially; when one side close to the first rubber core is pressurized and the other side is depressurized, the first rubber core and the second rubber core are not deformed.

Embodiment nine of the present utility model: the difference between this embodiment and the first embodiment is that: the oil pipe connecting sleeve is positioned at the side of the first rubber core, and the limiting table of the oil pipe connecting sleeve limits the first connecting sleeve.

The above description is only a preferred embodiment of the present utility model, and the patent protection scope of the present utility model is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present utility model should be included in the protection scope of the present utility model.

Claims (9)

1. A hydraulic swabbing blowout preventer is characterized in that: the steel wire rope winding device comprises an outer cylinder body, wherein a first rubber core (2), a pressure transmission part (3) and a second rubber core (16) are axially and sequentially installed in the outer cylinder body, through holes corresponding to each other in the axial direction are formed in the first rubber core (2), the first rubber core (2) is blocked by the outer cylinder body in the direction away from the second rubber core (16), a driving piston (13) is further slidably and hermetically installed in the outer cylinder body, the driving piston (13) is provided with a hydraulic oil way for driving the driving piston to axially move relative to the outer cylinder body, one end, away from the first rubber core (2), of the second rubber core (16) is connected with an axial pressing part for pushing the first rubber core (2) to axially move, and when the piston moves towards the first rubber core (2), the second rubber core (16), the pressure transmission part (3) and the first rubber core (2) are axially and sequentially extruded through the axial pressing part, and the first rubber core (2) are caused to radially shrink inwards to deform so as to hold the steel wire rope tightly.

2. The hydraulic swab blowout preventer of claim 1, wherein: the outer cylinder is provided with a piston cavity formed by outwards sinking in the radial direction at the position corresponding to the pressure transmission part, the driving piston (13) comprises a pipe body part (131) and an annular flange arranged on the outer peripheral surface of the pipe body part (131), the annular flange stretches into the piston cavity and is in sealing sliding fit with the inner wall of the piston cavity, and two ends of the pipe body part (131) are in sliding sealing fit with two side ports of the piston cavity in the axial direction.

3. The hydraulic swab blowout preventer of claim 2, wherein: one side of the annular flange, which is close to the first rubber core (2), in the piston cavity is provided with a reset spring (8) for resetting the driving piston in a direction away from the first rubber core (2), and one end of the piston cavity, which is away from the first rubber core (2), is connected with the hydraulic oil circuit.

4. The hydraulic swab blowout preventer of claim 2, wherein: the outer barrel is an axially spliced segmented structure and comprises a first segment, a second segment and a third segment, a radial outer flange is arranged at the end part of the first segment, which faces the second segment, the second segment comprises a barrel part and a radial inner flange, a piston cavity is formed between the radial outer flange and the radial inner flange after the first segment and the second segment are connected, and a pipe body part (131) is in sliding sealing fit with the inner side surfaces of the radial outer flange and the radial inner flange respectively.

5. The hydraulic swab blowout preventer of claim 4, wherein: one end of the pressure transmission part (3) is in sliding fit with the inner wall of the first section, the pipe body part (131) is sleeved on the outer side of the pressure transmission part (3) in a sliding mode, and the axial pressurizing part is connected to the end part, far away from the first rubber core, of the pipe body part (131).

6. The hydraulic swab blowout preventer of claim 5, wherein: and inclined surfaces which promote the first rubber core (2) to deform inwards during axial extrusion are arranged at the position of the outer cylinder body blocked by the first rubber core (2) and/or at the position of the pressure transmission part (3) in pressing contact with the first rubber core (2).

7. The hydraulic swab blowout preventer of claim 5, wherein: a pressing cap (15) is arranged between the second rubber core (16) and the pressure transmission part (3), and the pressing cap (15) is provided with an inclined surface which promotes the second rubber core (16) to deform inwards when being axially extruded on one side contacted with the second rubber core (16).

8. The hydraulic swab blowout preventer of claim 4, wherein: the axial compression element has a bevel on the side which is in contact with the second rubber core (16) which causes the second rubber core to deform inwards when axially compressed.

9. The hydraulic pumping blowout preventer according to any one of claims 1 to 8, wherein: the oil pipe connecting sleeve comprises an oil pipe connecting sleeve (20), a pin hole (2002) is formed in one end, far away from a first rubber core (2), of an outer cylinder body, and the oil pipe connecting sleeve (20) is fixedly connected with the outer cylinder body through a safety shearing pin (18) inserted in the pin hole.