阅读说明：本技术 可泄压的双锁防喷工作筒 (Double-lock blowout prevention working barrel capable of relieving pressure ) 是由 禹栽星 黄国全 谢冀江 李长青 宋波 张国杰 徐文超 于 2020-07-16 设计创作，主要内容包括：一种可泄压的双锁防喷工作筒,涉及油田井下作业技术领域,包括工作筒组件和堵塞器组件；工作筒组件,包括由上至下依次通过螺纹连接的单向阀、接箍、筒体、密封管和下接头,单向阀的结构包括阀体和阀球,阀体的侧壁上设置有阀孔,阀孔的轴线方向沿阀体的直径方向,所述阀球安装在阀孔内,阀球在弹簧的弹力作用下始终保持向阀座的轴线靠近的运动趋势,从而将阀孔封堵,所述筒体的内壁上加工有上下两个环形卡接部.本发明应用于油井管柱提捞作业,在下管柱和起出管柱作业时,向井下投入堵塞器组件,使其与预装在井下的工作筒组件卡接,便可将管柱中央的通道封堵,防止因套管内的井液压力过大而产生管柱内井液向井口处溢流的问题。(A double-lock blowout prevention working barrel capable of releasing pressure relates to the technical field of oil field downhole operation and comprises a working barrel assembly and a plug assembly; the invention relates to a working barrel assembly, which comprises a check valve, a coupling, a barrel, a sealing pipe and a lower connector which are sequentially connected through threads from top to bottom, wherein the check valve structurally comprises a valve body and a valve ball, a valve hole is formed in the side wall of the valve body, the axis direction of the valve hole is along the diameter direction of the valve body, the valve ball is arranged in the valve hole, the valve ball always keeps the motion trend of approaching to the axis of a valve seat under the action of the elastic force of a spring so as to block the valve hole, and an upper annular clamping part and a lower annular clamping part are processed on the inner wall of the barrel.)

1. The utility model provides a working barrel is prevented spouting by double lock that can let out pressure which characterized in that: comprises a working barrel assembly and a blanking plug assembly;

the working cylinder assembly comprises a check valve, a coupling (2), a cylinder body (3), a sealing pipe (4) and a lower connector (5) which are sequentially connected through threads from top to bottom, the structure of the check valve comprises a valve body (1) and a valve ball (30), a valve hole (31) is formed in the side wall of the valve body (1), the axis direction of the valve hole (31) is along the diameter direction of the valve body (1), the valve ball (30) is installed in the valve hole (31), the valve ball (30) always keeps a motion trend close to the axis of a valve seat (1) under the elastic force action of a spring, so that the valve hole (31) is sealed, and an upper annular clamping part and a lower annular clamping part (32) are processed on the inner wall of the cylinder body (3);

the blanking plug assembly comprises a counterweight body (7), an upper cam seat (17), a lower cam seat (15), a sealing section (12) and a guide head (13) which are sequentially connected through threads from top to bottom;

a limiting block A (8) and a cam A (9) are installed in the upper cam seat (17), the cam A (9) is installed in the upper cam seat (17) through a transverse pin shaft, a torsion spring is installed on the pin shaft, a protruding portion (16) is machined on the cam A (9), the cam A (9) always keeps a movement trend that the protruding portion (16) protrudes from the outer cylindrical surface of the upper cam seat (17) under the action of the elastic force of the torsion spring, the limiting block A (8) is clamped on the side surface of the cam A (9), so that the limit position of the cam A (9) after rotation is determined, and when the cam A (9) is located at the limit position, the protruding portion (16) on the cam A (9) is located in a protruding state;

a limiting block B (10) and a cam B (11) are installed in the lower cam seat (15), the cam B (11) is installed in the lower cam seat (15) through a transverse pin shaft, a torsion spring is installed on the pin shaft, an extending part (16) is also processed on the cam B (11), the cam B (11) always keeps a movement trend that the extending part (16) extends out of the outer cylindrical surface of the lower cam seat (15) under the action of the elastic force of the torsion spring, the limiting block B (10) is clamped on the side surface of the cam B (11), so that the limit position of the cam B (11) after rotation is determined, and when the cam B (11) is located at the limit position, the extending part (16) on the cam B (11) is located in an extending state;

the protruding parts (16) on the cam A (9) and the cam B (11) respectively correspond to two annular clamping parts (32) on the inner side of the working barrel assembly;

the outer diameter of the sealing section (12) is matched with the inner diameter of a sealing pipe (4) in the working barrel assembly, and a sealing ring (14) is installed on the outer side of the joint of the sealing section (12) and the guide head (13).

2. The double-lock blowout preventer working cylinder capable of being depressurized according to claim 1, wherein: and a plugging device which can be opened by external force is arranged in the lower joint (5).

3. A depressible dual lock blowout preventer mandrel according to claim 2, wherein: the plugging device comprises a baffle (18) and shear pins (19), the upper side of the baffle (18) is limited through a seam allowance at the inner side of the lower joint (5), and the lower side of the baffle (18) is limited through the shear pins (19) arranged on the side wall of the lower joint (5).

4. A depressible dual lock blowout preventer mandrel according to claim 2, wherein: the plugging device comprises a ball seat (20), an unlocking ball (22), a sliding pin (24), a sliding block (23), a spring A (21) and a spring B (25), wherein radial through holes are formed in the side walls of the ball seat (20) and the lower joint (5), the spring B (25), the sliding block (23) and the sliding pin (24) are all installed in the radial through holes, the sliding pin (24) is installed on the ball seat (20) in a sliding mode, the sliding block (23) always abuts against the end face of the sliding pin (24) under the elastic force action of the spring B (25), a ball groove matched with the unlocking ball (22) is formed in the ball seat (20), when the unlocking ball (22) falls into the ball groove, the sliding pin (24) slides in the axis direction of the sliding pin under the pushing action of the unlocking ball (22), and when the sliding block (22) falls into the bottom of the ball groove, the joint face between the sliding pin (24) and the sliding pin (23) is just located on the cylindrical surface on the outer side of the ball seat (20) .

5. The double-lock blowout preventer working cylinder capable of being depressurized according to claim 4, wherein: a spring A (21) is arranged between the lower joint (5) and the ball seat (20), and the ball seat (20) always keeps a downward movement trend under the elastic force action of the spring A (21).

6. A depressible dual lock blowout preventer mandrel according to claim 2, wherein: the plugging device comprises a sealing seat (27), a piston (26) and a lock pin (28), wherein the piston (26) is installed in a blind hole in the center of the sealing seat (27) from the upper side, a radial through hole is formed in the side wall of the sealing seat (27), the lock pin (28) is inserted into the radial through hole, an annular groove matched with the lock pin (28) is formed in the inner wall of the lower connector (5), one end of the lock pin (28) is inserted into the annular groove, and the other end of the lock pin (28) abuts against the outer side of the piston (26);

two sealing rings (14) are arranged on a sealing surface between the piston (26) and the sealing seat (27), a balance channel (33) is machined in an entity of the sealing seat (27), one end of the balance channel (33) leads to a position between the two sealing rings (14) on the outer side of the piston (26), and the other end of the balance channel (33) leads to the lower side of the sealing seat (27);

an air chamber (34) is provided on the underside of the piston (26).

7. The double-lock blowout preventer working cylinder according to claim 6, wherein: a spring C (29) is arranged between the lower joint (5) and the sealing seat (27), and the sealing seat (27) always keeps a downward movement trend under the elastic force action of the spring C (29).

8. A depressible, double lock blowout preventer mandrel according to claims 1-7, wherein: the lower end of the lower joint (5) is provided with a wax scraping cutting edge (6).

Technical Field

The invention belongs to the technical field of oil field downhole operation, and particularly relates to a pressure-relief double-lock blowout-preventing working barrel.

Background

In the process of underground operation construction of an oil field, when a pipe column is lowered and lifted out, well liquid in the pipe column often overflows to a well mouth due to the fact that the well liquid pressure in the sleeve is large, and well site environment pollution is caused. In order to solve the problem that the well site environment is polluted, a technical personnel designs a wellhead return liquid collecting device, and the environmental pollution is avoided by collecting overflowed well liquid. However, this anti-contamination solution has the disadvantages: 1. the collected well fluid needs to be stored in a liquid storage tank or a liquid storage tank and needs to be transported by a vehicle; 2. well fluids that reach the well are inevitably spilled on the ground in small quantities, so that contamination of the ground by the well fluids is difficult to avoid completely.

Disclosure of Invention

In order to solve the technical problems in the background art, the invention provides a double-lock blowout prevention working barrel capable of relieving pressure.

The technical problem solved by the invention is realized by adopting the following technical scheme: the invention provides a double-lock blowout prevention working barrel capable of relieving pressure, which comprises a working barrel assembly and a blanking plug assembly, wherein the working barrel assembly comprises a cylinder body and a cylinder cover;

the working cylinder assembly comprises a check valve, a coupling, a cylinder body, a sealing tube and a lower connector which are sequentially connected through threads from top to bottom, the check valve structurally comprises a valve body and a valve ball, a valve hole is formed in the side wall of the valve body, the axis direction of the valve hole is along the diameter direction of the valve body, the valve ball is installed in the valve hole, the valve ball always keeps a motion trend close to the axis of a valve seat under the elastic action of a spring, so that the valve hole is blocked, and an upper annular clamping part and a lower annular clamping part are processed on the inner wall of the cylinder body;

the blanking plug assembly comprises a counterweight body, an upper cam seat, a lower cam seat, a sealing section and a guide head which are sequentially connected through threads from top to bottom;

the upper cam seat is internally provided with a limiting block A and a cam A, the cam A is arranged in the upper cam seat through a transverse pin shaft, a torsion spring is arranged on the pin shaft, an extending part is processed on the cam A, the cam A always keeps the motion trend that the extending part extends out of the outer cylindrical surface of the upper cam seat under the action of the elasticity of the torsion spring, and the limiting block A is clamped on the side surface of the cam A, so that the limit position of the cam A after rotation is determined, and when the cam A is located at the limit position, the extending part on the cam A is in an extending state;

the limiting block B and the cam B are installed in the lower cam seat, the cam B is installed in the lower cam seat through a transverse pin shaft, a torsion spring is installed on the pin shaft, an extending portion is machined on the cam B, the cam B always keeps the motion trend that the extending portion extends out of the outer cylindrical surface of the lower cam seat under the action of the elastic force of the torsion spring, the limiting block B is clamped on the side face of the cam B, therefore, the limit position of the cam B after rotation is determined, and when the cam B is located at the limit position, the extending portion on the cam B is in an extending state;

the protruding parts on the cam A and the cam B respectively correspond to the two annular clamping parts on the inner side of the working barrel assembly;

the outer diameter of the sealing section is matched with the inner diameter of a sealing pipe in the working barrel assembly, and a sealing ring is arranged on the outer side of a joint of the sealing section and the guide head.

As a further technical scheme, a plugging device which can be opened through external force is installed in the lower joint.

As a further technical scheme, the plugging device comprises a baffle and shear pins, the upper side of the baffle is limited through a seam allowance on the inner side of the lower connector, and the lower side of the baffle is limited through the shear pins arranged on the side wall of the lower connector.

As a further technical scheme, the plugging device comprises a ball seat, an unlocking ball, a sliding pin, a sliding block, a spring A and a spring B, wherein a radial through hole is formed in the side wall of the ball seat and the side wall of the lower joint, the spring B, the sliding block and the sliding pin are all installed in the radial through hole, the sliding pin is installed on the ball seat in a sliding mode, the sliding block always abuts against the end face of the sliding pin under the elastic action of the spring B, a ball groove matched with the unlocking ball is formed in the ball seat, the sliding pin slides along the axis direction of the sliding pin under the pushing action of the unlocking ball in the ball groove process when the unlocking ball falls into the ball groove, and when the unlocking ball falls into the bottommost part of the ball groove, the joint face between the sliding pin and the sliding block is just located on the cylindrical face outside the.

As a further technical scheme, a spring A is arranged between the lower joint and the ball seat, and the ball seat always keeps a downward movement trend under the elastic force of the spring A.

As a further technical scheme, the plugging device comprises a sealing seat, a piston and a lock pin, wherein the piston is installed in a blind hole in the center of the sealing seat from the upper side, a radial through hole is formed in the side wall of the sealing seat, the lock pin is inserted into the radial through hole, an annular groove matched with the lock pin is formed in the inner wall of the lower joint, one end of the lock pin is inserted into the annular groove, and the other end of the lock pin abuts against the outer side of the piston;

two sealing rings are arranged on a sealing surface between the piston and the sealing seat, a balance channel is processed in an entity of the sealing seat, one end of the balance channel is communicated between the two sealing rings on the outer side of the piston, and the other end of the balance channel is communicated to the lower side of the sealing seat;

an air chamber is provided on the underside of the piston.

As a further technical scheme, a spring C is arranged between the lower joint and the sealing seat, and the sealing seat always keeps a downward movement trend under the action of the elastic force of the spring C.

As a further technical scheme, the lower end of the lower joint is provided with a wax scraping cutting edge.

The invention has the beneficial effects that:

1. the invention is applied to the fishing operation of the oil well pipe column, when the pipe column is lowered and taken out, the blanking plug assembly is put into the well and is clamped with the working barrel assembly which is pre-installed in the well, so that the channel in the center of the pipe column can be plugged, and the problem that the well fluid in the pipe column overflows to the well mouth due to the overlarge well fluid pressure in the sleeve is prevented.

2. According to the invention, two annular clamping parts are arranged in the working barrel assembly, two cams for clamping the annular clamping parts are arranged on the blanking plug assembly, after the blanking plug assembly is put into a pipe column, the two cams on the blanking plug assembly respectively cross the two annular clamping parts in the working barrel assembly, and when the blanking plug assembly is pushed upwards by well fluid pressure, the two cams are respectively clamped on the two annular clamping parts, so that the pushing force of the well fluid on the blanking plug assembly is resisted. Therefore, the invention can realize pressure-bearing plugging and effectively ensure the reliability of plugging.

3. According to the plug-in device, the distance between the two cams on the plug-in device assembly is smaller than the distance between the two annular clamping parts on the working barrel assembly, if one cam is mistakenly clamped or is separated from the other cam during plug-in, the other cam can be firmly clamped, and the purpose of double insurance of plug-in operation is achieved.

4. The setting of the one-way valve prevents the well liquid in the casing from entering the pipe column. When the pipe column is lifted out and lifted, the well liquid in the pipe column and the well liquid in the sleeve pipe generate pressure difference, and then the well liquid in the pipe column can flow back into the sleeve pipe through the check valve, so that no liquid flow overflows at the well mouth. Realizing the environmental protection operation.

5. The lower end of the lower joint is provided with the wax scraping cutting edge, so that oil stains on the inner wall of the casing can be scraped and cleaned when the casing is put into a well, and the casing is prevented from being stuck when a tubular column is put into the well.

6. According to the invention, the lower joint is internally provided with the plugging device which can seal the lower end of the working barrel, so that liquid can not be fed into the pipe column when the well is lowered, and the well mouth can not overflow when the pipe column is lowered into the well.

Drawings

FIG. 1 is a schematic structural view of a work cylinder assembly;

FIG. 2 is a schematic structural view of an obturator assembly;

FIG. 3 is a schematic view of a first embodiment of an occluding device in a lower junction;

FIG. 4 is a schematic view of a second embodiment of an occluding device in a lower junction;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a schematic view of a third embodiment of an occluding device in a lower junction;

FIG. 7 is a schematic structural view of another embodiment of an obturator assembly;

fig. 8 is a partial enlarged view at B in fig. 7.

In the figure: 1-valve body, 2-coupling, 3-cylinder, 4-sealing tube, 5-lower joint, 6-wax scraping edge, 7-counterweight body, 8-limiting block A, 9-cam A, 10-limiting block B, 11-cam B11, 12-sealing section, 13-guiding head, 14-sealing ring, 15-lower cam seat, 16-extension part, 17-upper cam seat, 18-baffle, 19-shear pin, 20-ball seat, 21-spring A, 22-unlocking ball, 23-sliding block, 24-sliding pin, 25-spring B, 26-piston, 27-sealing seat, 28-locking pin, 29-spring C, 30-valve ball, 31-valve hole, 32-annular clamping part and 33-balance channel, 34-an air cavity, 35-a driving rod, 36-a pressing sleeve, 37-a spring D, 38-a piston rod, 39-a tip, 40-a rubber sleeve, 41-a sliding rod, 42-a check valve, 43-a nylon pin and 44-a withdrawal groove.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

as shown in fig. 1 and 2, the present invention includes a mandrel assembly and an obturator assembly;

as shown in figure 1, the working barrel assembly comprises a check valve, a coupling 2, a barrel 3, a sealing pipe 4 and a lower joint 5 which are connected in sequence from top to bottom through threads, and the check valve is arranged to prevent well fluid in a sleeve from entering a pipe column. When the pipe column is lifted out and lifted, the well liquid in the pipe column and the well liquid in the sleeve pipe generate pressure difference, and then the well liquid in the pipe column can flow back into the sleeve pipe through the check valve, so that no liquid flow overflows at the well mouth. Realizing the environmental protection operation. The structure of the check valve comprises a valve body 1 and a valve ball 30, wherein a valve hole 31 is formed in the side wall of the valve body 1, the axis direction of the valve hole 31 is along the diameter direction of the valve body 1, the valve ball 30 is installed in the valve hole 31, the valve ball 30 always keeps the motion trend close to the axis of the valve seat 1 under the elastic action of a spring, so that the valve hole 31 is blocked, and an upper annular clamping part and a lower annular clamping part 32 are processed on the inner wall of the cylinder 3;

as shown in fig. 2, the blanking plug assembly comprises a counterweight body 7, an upper cam seat 17, a lower cam seat 15, a sealing section 12 and a guide head 13 which are connected in sequence from top to bottom through threads;

a limiting block A8 and a cam A9 are installed in the upper cam seat 17, the cam A9 is installed in the upper cam seat 17 through a transverse pin shaft, a torsion spring is installed on the pin shaft, a protruding portion 16 is machined on the cam A9, the cam A9 always keeps the movement trend that the protruding portion 16 protrudes from the outer cylindrical surface of the upper cam seat 17 under the elastic action of the torsion spring, the limiting block A8 is clamped on the side surface of the cam A9, so that the limit position of the cam A9 after rotation is determined, and when the cam A9 is located at the limit position, the protruding portion 16 on the cam A9 is in the protruding state;

a limit block B10 and a cam B11 are installed in the lower cam seat 15, the cam B11 is installed in the lower cam seat 15 through a transverse pin shaft, a torsion spring is installed on the pin shaft, an extending part 16 is also processed on the cam B11, the cam B11 always keeps the movement trend of enabling the extending part 16 to extend out of the outer cylindrical surface of the lower cam seat 15 under the action of the elastic force of the torsion spring, the limit block B10 is clamped on the side surface of the cam B11, so that the limit position of the cam B11 after rotation is determined, and when the cam B11 is at the limit position, the extending part 16 on the cam B11 is in the extending state;

the protruding parts 16 on the cam A9 and the cam B11 correspond to two annular clamping parts 32 on the inner side of the working barrel assembly respectively.

According to the invention, two annular clamping parts 32 are arranged in the working barrel assembly, two cams for clamping the annular clamping parts 32 are arranged on the blanking plug assembly, after the blanking plug assembly is put into a tubular column, the two cams on the blanking plug assembly respectively cross the two annular clamping parts 32 in the working barrel assembly, and when the blanking plug assembly is pushed upwards by well fluid pressure, the two cams are respectively clamped on the two annular clamping parts 32, so that the pushing force of the well fluid on the blanking plug assembly is resisted. Therefore, the invention can realize pressure-bearing plugging and effectively ensure the reliability of plugging.

The outer diameter of the sealing section 12 is matched with the inner diameter of the sealing tube 4 in the working barrel assembly, and a sealing ring 14 is arranged on the outer side of the joint part of the sealing section 12 and the guide head 13.

The invention is applied to the fishing operation of the oil well pipe column, when the pipe column is lowered and taken out, the blanking plug assembly is put into the well and is clamped with the working barrel assembly which is pre-installed in the well, so that the channel in the center of the pipe column can be plugged, and the problem that the well fluid in the pipe column overflows to the well mouth due to the overlarge well fluid pressure in the sleeve is prevented.

The working process of the invention is as follows:

during operation, the working barrel assembly is connected to the lower end of the oil pipe column and is arranged in the well, when the pipe column is lifted, the blanking plug assembly is thrown into the pipe column before the pipe column is lifted, the blanking plug assembly falls under the action of self gravity and is finally inserted into the working barrel assembly and clamped with the working barrel assembly, so that the pipe column is plugged, and the blowout prevention purpose is achieved.

When the plug is put into operation, the distance between the two cams on the plug assembly needs to be smaller than the distance between the two annular clamping parts 32 on the working barrel assembly, if one cam is mistakenly clamped or is separated from the clamping part during plug throwing, the other cam can be firmly clamped, and the purpose of double insurance of plug throwing operation is achieved.

As a further technical solution, a plugging device which can be opened by external force may be installed in the lower joint 5. The lower end of the working barrel assembly can be sealed by the plugging device, so that liquid can not be fed into the pipe column when the pipe column is lowered into the well, and the well mouth can not overflow when the pipe column is lowered into the well. Before oil pumping operation, a certain technological means is needed to open the plugging device (i.e. to remove plugging), so that the blockage of the plugging device on the oil pumping operation is avoided.

The following embodiments may be used for the occlusion device: