CN215169895U

CN215169895U - Leakage-proof valve

Info

Publication number: CN215169895U
Application number: CN202120941249.8U
Authority: CN
Inventors: 董社霞; 周欢; 徐凤祥; 李强; 张文博; 王厚东; 张伦; 梁月松
Original assignee: China Oilfield Services Ltd
Current assignee: China Oilfield Services Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-12-14
Anticipated expiration: 2031-04-30

Abstract

The utility model discloses a leak protection valve, it includes: a valve body including a housing configured as a straight-bar-shaped cylinder; a ball valve assembly including a first valve seat configured in a cylindrical shape disposed within and coaxially with the housing; a second valve seat configured in a cylindrical shape, disposed within the housing and coaxially disposed with the housing; a spool interposed between the first valve seat and the second valve seat; and an anchoring mechanism comprising a connection joint; a support sleeve; a shear ring; shearing the pin; and an anchor comprising a sleeve; an anchoring claw; wherein the anchoring claw is provided with a plurality of convex parts. The leakage-proof valve is not required to be put into a well together with other well completion tools, can be independently put down and taken out, resists the high temperature of 350 ℃, is designed into a bidirectional sealing valve, can simultaneously bear the upper and lower pressure difference of 21MPa, has reliable sealing performance and large inner drift diameter, and meets the requirements of subsequent production.

Description

Leakage-proof valve

Technical Field

The utility model relates to an equipment in oil field oil testing, well completion, well workover engineering field, more specifically relates to a leak protection valve.

Background

The proportion of thick oil in the Bohai sea oil field is up to 60% by adopting a thermal recovery mode, the thick oil field is inevitably developed by developing a thermal recovery process and a matching technology thereof, the leakage phenomenon of a shaft is very common in the well completion or well repair operation process, the leakage phenomenon not only increases the operation cost, but also can cause the oil layer to be polluted and damaged, and the productivity and the development effect of the well are influenced.

At present, in the process of petroleum and natural gas well completion or production, an anti-leakage valve is often required to be used as a part of a well completion tool to be put into a well, the anti-leakage valve is in an open state in the process of well completion operation, so that a completion fluid can pass through, and the anti-leakage valve is closed when the well completion is finished, so that the completion fluid is prevented from leaking into a bottom layer to pollute the stratum; in the production stage, the anti-leakage valve is opened again by using a switching tool with a centralizer, and the produced liquid at the bottom of the well upwards passes through the anti-leakage valve and is produced to the ground through oil extraction equipment; when the well is repaired, the production pipe column is lifted, and the leak-proof valve is closed again by the switching tool.

Currently, the leak-tight valve needs to be run downhole with other completion tools and cannot be run and removed separately. Meanwhile, the leakage prevention valve is difficult to operate at a high temperature of 350 ℃.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a leak protection valve, this kind of leak protection valve need not go into in the pit with other well completion tools together, can transfer alone and take out.

This leak protection valve includes:

a valve body comprising

A housing configured as a straight-bar-shaped cylinder;

a ball valve assembly comprising

A first valve seat configured in a cylindrical shape, disposed within the housing and coaxially disposed with the housing;

a second valve seat configured in a cylindrical shape, disposed within the housing and coaxially disposed with the housing;

the valve core is clamped between the first valve seat and the second valve seat, is provided with a through hole penetrating through the valve core, and the outer peripheral surface of the valve core comprises a spherical surface abutting against the first valve seat and the second valve seat;

an anchoring mechanism comprising

One end of the connecting joint is connected with the valve body;

one end of the supporting sleeve is connected to the other end of the connecting joint, and the outer diameter of the supporting sleeve is smaller than that of the connecting joint;

the shearing ring is sleeved on the supporting sleeve, the end face of one end of the shearing ring, which faces the connecting joint, is an inclined plane, and the distance between the shearing ring and the supporting sleeve is smaller when the shearing ring is closer to the connecting joint;

the shearing pin is used for connecting the shearing ring and the supporting sleeve; and

an anchor comprising

The sleeve is sleeved on the support sleeve and is positioned between the shearing ring and the connecting joint;

an anchoring claw extending from an end of the sleeve facing away from the connection joint in a direction facing away from the connection joint;

the anchoring claw is provided with a plurality of protruding parts, and the protruding parts protrude from one side of the anchoring claw, which is away from the supporting sleeve, to the direction away from the supporting sleeve.

The leak-proof valve can be independently put into or taken out of the well.

During the completion operation, after other completion tools are put in place, the top packer is positioned at the topmost part of the completion tools; the anti-leakage valve is lowered through a drill rod matched feeding tool, the anchoring mechanism is matched with the top packer in the downward pressing process, the anchoring claw abuts against one end of the connecting joint in the downward pressing process, and the connecting joint applies downward pressure to the anchoring claw to enable the anchoring claw to be jacked into a fishing buckle of the top packer; after the ball is thrown and pressed, the sending tool is released from the hand, so that the drill rod is separated from the leakage-proof valve, the drill rod is lifted, the switch tool connected with the sending tool is lifted, and the leakage-proof valve can be closed by lifting the switch tool; then a production string is put in, a switching tool is connected to the lowest end of the production string, and the switching tool is pressed down to open the leakage-proof valve so as to facilitate generation operation; the anti-leakage valve is lifted for a certain distance to enable the shearing ring to prop against the anchoring claw, the anchoring claw is clamped in a fishing buckle of a top packer and is fixed in the process of lifting the oil pipe column, the shearing ring moves upwards, one end of the shearing ring is inserted between the anchoring claw and the supporting sleeve, the inclined plane of the shearing ring is abutted against the anchoring claw to enable the anchoring claw to have an opening trend, the shearing ring props against the anchoring claw to enable the anchoring claw not to be separated from the fishing buckle, and therefore the down-putting of the anti-leakage valve is completed.

The leak-proof valve can also be separately removed downhole, the retrieving tool is clamped at the top end of the housing of the leak-proof valve body, then the retrieving tool is lifted to apply a large lifting force to the upper end of the leak-proof valve, for example, when the lifting force reaches 50t, the shearing pin is sheared by the shearing ring, then the shearing ring is pulled out from between the anchoring claw and the supporting sleeve, the anchoring claw can be pulled out from the fishing buckle of the top packer, so that the top packer is separated from the leak-proof valve, and then the leak-proof valve can be separately removed downhole.

In this way, it can be taken out separately and lowered again separately without having to trip out the entire tubular string downhole.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention and not to limit the embodiments of the invention.

Fig. 1 is a cross-sectional view of a leak-proof valve in an open state according to the present invention;

fig. 2 is a cross-sectional view of the leak-proof valve in a closed state according to the present invention;

fig. 3 is a cross-sectional view of the leak-proof valve of the present invention at the valve core;

fig. 4 is a cross-sectional view of the ball valve assembly of the present invention;

fig. 5 is a cross-sectional view of an anchoring mechanism according to the present invention;

fig. 6 is a cross-sectional view of a first refractory seal assembly in accordance with the present invention;

fig. 7 is a partial cross-sectional view of an anchoring mechanism of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

As shown in fig. 1 and 2, fig. 1 and 2 show a schematic structural diagram of a leak-proof valve in this embodiment. The leak-proof valve includes a valve body 1 and an anchoring mechanism 2. The anchoring mechanism 2 is connected to the valve body 1. The anchoring mechanism 2 can be connected and disconnected to the downhole packer.

The valve body 1 includes a housing 11, a drive assembly 14 and a ball valve assembly 15. The housing 11 is configured as a straight cylinder. Both the drive assembly 14 and the ball valve assembly 15 are disposed within the housing 11.

In the present embodiment, the housing 11 includes an upper joint 111, a lock outer cylinder 112, a connection outer cylinder 113, a ball valve outer cylinder 114, a lower joint 115, and a ball cage 116. The upper joint 111, the lock outer cylinder 112, the connection outer cylinder 113, the ball valve outer cylinder 114, and the lower joint 115 are all configured in a cylindrical shape. The upper joint 111, the locking outer cylinder 112, the connecting outer cylinder 113, the ball valve outer cylinder 114 and the lower joint 115 are coaxially arranged and are sequentially connected together. Two adjacent components of the upper joint 111, the locking outer cylinder 112, the connecting outer cylinder 113, the ball valve outer cylinder 114 and the lower joint 115 can be connected by screw threads.

The end of the upper adapter 111 facing away from the locking cylinder 112 may be used to circumscribe a retrieval tool. A first groove 1121 and a second groove 1122 are provided on the inner wall of the lock outer cylinder 112. The first groove 1121 and the second groove 1122 are each formed by radially inwardly recessing the inner peripheral surface of the lock outer cylinder 112. The second groove 1122 is closer to the ball valve outer cylinder 114 than the first groove 1121. The first and

second grooves

1121, 1122 may be annular grooves. The first groove 1121 and the second groove 1122 are both provided coaxially with the lock outer cylinder 112. The inner diameter of the coupling outer cylinder 113 is the same as that of the locking outer cylinder 112. The ball valve outer cylinder 114 has an inner diameter smaller than that of the coupling outer cylinder 113 and smaller than that of the lower joint 115. Thus, the inner wall of the housing 11 forms an annular mounting recess at the ball valve outer barrel 114.

The cage 116 is configured as a generally cylindrical structure. The ball cage 116 is disposed within the ball valve outer barrel 114, and the ball cage 116 is disposed coaxially with the ball valve outer barrel 114. The end of the cage 116 facing away is sandwiched between the ball valve outer barrel 114 and the lower adapter 115 so that the cage 116 is secured. The other end of the ball cage 116 is provided with a radially inwardly projecting limit projection 1161.

The driving assembly 14 includes an elastic claw 12, a connecting string 141, and an operating pin 142. The drive assemblies 14 are each disposed within the housing 11. The elastic claw 12, the connection stem 141, and the operation pin 142 are sequentially disposed in the inner cavity of the housing 11, and the elastic claw 12, the connection stem 141, and the operation pin 142 are sequentially connected together.

The elastic claw 12 includes a support sleeve 121, a first elastic claw 122, a second elastic claw 124, and a connection sleeve 126. The resilient claws 12 are arranged in the lock outer cylinder 112. The support sleeve 121 is configured in a cylindrical shape and is disposed coaxially with the lock outer cylinder 112. The support sleeve 121 can slide in the axial direction of the lock outer cylinder 112. Both the first elastic jaw 122 and the second elastic jaw 124 are provided on the support sleeve 121. The first and second

elastic jaws

122 and 124 may protrude from opposite ends of the support sleeve 121 in a direction away from the support sleeve 121, respectively. The first elastic claw 122 and the second elastic claw 124 are abutted against the inner wall of the locking outer cylinder 112, and the first elastic claw 122 and the second elastic claw 124 are elastically bent, and the first elastic claw 12 and the second elastic claw 12 have a tendency of expanding outward in the radial direction of the locking outer cylinder 112 under the action of respective restoring elastic forces. A first projection 123 is provided on a side of the first resilient claw 12 close to the lock outer cylinder 112. A second protrusion 125 is provided on a side of the second resilient claw 12 close to the lock outer cylinder 112. The second projection 125 is closer to the ball valve outer cylinder 114 than the first projection 123. The distance between the first protrusion 123 and the second protrusion 125 is smaller than the distance between the first recess 1121 and the second recess 1122. The first elastic claw 12 and the second elastic claw 12 may each be provided in plurality. The plurality of first elastic claws 12 are annularly distributed, and the plurality of second elastic claws 12 are annularly distributed. A coupling sleeve 126 is arranged at the end of the second spring catch 124 facing away from the support sleeve 121. The elastic claw 12 can slide reciprocally in the axial direction of the lock outer cylinder 112.

The connecting string 141 is in the shape of a circular tube. The connecting string 141 is tubular. The connection stub 141 extends from the lock outer cylinder 112 through the connection outer cylinder 113 into the ball valve outer cylinder 114. The connection pipe 141 can slide in the axial direction of the housing 11. The passage in the connecting string 141 is a fluid passage. The connection between the connection pipe 141 and the connection sleeve 126 of the elastic claw 12 can be a threaded connection.

Two operation pins 142 may be provided. One ends of both operation pins 142 are connected to the connection pipe 141. The other ends of both operating pins 142 are inserted into the ball cage 116. The operating pin 142 forms a sliding connection with the cage 116. The operation pin 142 can slide in the axial direction of the housing 11.

As shown in fig. 3 and 4, the ball valve assembly 15 is disposed within the ball valve outer barrel 114. The ball valve assembly 15 includes a first valve seat 152, a second valve seat 153, a spool 151, and two control pins 155. The first valve seat 152 and the second valve seat 153 are each configured in a cylindrical shape. The first valve seat 152 is disposed at an end of the ball cage 116 close to the elastic claw 12 and on a side of the limiting protrusion 1161 away from the elastic claw 12. The first valve seat 152 may slide along the ball valve. The second valve seat 153 is disposed coaxially with the first valve seat 152. A second valve seat 153 is fixed to the end of the lower joint 115 facing the ball cage 116. The second valve seat 153 and the first valve seat 152 are separated from each other. The end surfaces of the first valve seat 152 and the second valve seat 153 at the ends adjacent to each other are both spherical surfaces.

The valve core 151 is provided at a middle portion thereof with a through hole 1511 penetrating the valve core 151. The outer peripheral surface of the valve body 151 includes a spherical surface that abuts against the first valve seat 152 and the second valve seat 153, respectively. The spool 151 is interposed between a first valve seat 152 and a second valve seat 153. The spherical surface of the spool 151 forms a seal with the end surfaces of the first valve seat 152 and the second valve seat 153, respectively.

Two control pins 155 are provided on opposite sides of the spool 151, respectively. The control pin 155 is eccentrically disposed on the valve body 151, i.e., the axis of the control pin 155 and its extension do not extend through the center of the valve body 151. The axis of the control pin 155 is perpendicular to the axis of the through hole 1511. Two control pins 155 are arranged in alignment. The two operation pins 142 abut against the two control pins 155, respectively.

When the leak-proof valve is installed in the well, the running switch tool can move the elastic claw 12, and the elastic claw 12 can drive the connecting pipe column 141 and the two operation pins 142 to move synchronously. The two operating pins 142 can push the two control pins 155 synchronously to drive the valve element 151 to rotate relative to the first valve seat 152 and the second valve seat 153.

As shown in fig. 2, after the elastic claw 12 is lifted up by the opening and closing tool, when the elastic claw 12 slides along the axial direction of the lock outer cylinder 112 in the direction away from the valve core 151 until the first protrusion 123 sinks into the first recess 1121, the elastic claw 12 is locked, and the valve core 151 can rotate until the axis of the through hole 1511 of the valve core is perpendicular to the axis of the inner hole of the first valve seat 152, so that the valve core 151 cuts off the flow passage between the first valve seat 152 and the second valve seat 153, and the leak-proof valve is closed.

As shown in fig. 1, after the elastic claw 12 is pressed down by the opening and closing tool, the elastic claw 12 is locked when the elastic claw 12 slides in the axial direction of the lock outer cylinder 112 toward the valve body 151 until the second protrusion 125 is recessed into the second recess 1122, and the valve body 151 can rotate until the axis of the through hole 1511 is parallel to the axis of the inner hole of the first valve seat 152, so that the through hole 1511 communicates the inner holes of the first valve seat 152 and the second valve seat 153, and the leak-proof valve is opened.

When the elastic claw 12 is locked, the elastic claw 12 is hard to slide with respect to the lock outer cylinder 112, and a large external force needs to be applied to the elastic claw 12 to disengage the first protrusion 123 from the first recess 1121 and the second protrusion 125 from the second recess 1122, thereby releasing the lock of the elastic claw 12.

As shown in fig. 5, the anchoring mechanism 2 includes a connection joint 21, a support sleeve 22, an anchor 23, a shear ring 24, and a shear pin 25. The connection joint 21 and the support sleeve 22 are each in the shape of a straight cylinder, and may be circular in cross section. One end of the connection joint 21 is fitted over the lower joint 115 and is screw-coupled with the lower joint 115. The other end of the connecting joint 21 is sleeved on the support sleeve 22 and is in threaded connection with the support sleeve 22. The outer diameter of the connection nipple 21 is larger than the outer diameter of the support sleeve 22.

Anchor 23 includes a sleeve 231 and a plurality of anchor claws 232. The cross-section of the sleeve 231 may be circular. The sleeve 231 is fitted over the support sleeve 22. A plurality of anchoring claws 232 each project from the end of the sleeve 231 facing away from the connection nipple 21 in a direction away from the connection nipple 21. A plurality of anchoring claws 232 are evenly wrapped around the support sleeve 22. The anchoring claw 232 is provided with a plurality of projections 233, which projections 233 project from the side of the anchoring claw 232 facing away from the support sleeve 22 in a direction facing away from the support sleeve 22. The projection 233 may be located at an end of the anchoring claw 232 facing away from the sleeve 231. Anchor 23 can slide along support sleeve 22.

Shear ring 24 is annular in shape. Shear ring 24 is fitted over support sleeve 22 and on the side of anchor 23 facing away from connection joint 21. The distance between shear ring 24 and attachment joint 21 is greater than the length of anchor 23. The end face of shear ring 24 facing the end of anchor 23 is beveled, the closer the portion of the bevel that is closer to anchor 23, the smaller the distance from support sleeve 22. The shear ring 24 also has a pin hole formed therethrough for the shear ring 24. The outer peripheral wall of the connecting outer cylinder 113 is provided with blind holes aligned with the pin holes.

The shear pin 25 is inserted into the pin hole of the shear ring 24 and inserted into the blind hole of the connecting outer cylinder 113. The shear pin 25 secures the shear ring 24 to the connecting outer cylinder 113 to prevent the shear ring 24 from sliding relative to the connecting outer cylinder 113.

The leak-proof valve can be independently put into or taken out of the well. Specifically, during the completion operation, after other completion tools are lowered into place, the top packer is positioned at the topmost part of the completion tools; then the anti-leakage valve is lowered through the cooperation of the oil pipe string and the drill rod and the feeding tool, the anchoring mechanism 2 is matched with the top packer in the pressing-down process, the anchoring claw 232 abuts against one end of the connecting joint 21 in the lowering process, and the connecting joint 21 applies downward pressure to the anchoring claw 232 to enable the anchoring claw 232 to be jacked into the fishing buckle of the top packer; after the ball is thrown and pressed, the sending tool is released from the hand, so that the drill rod is separated from the leakage-proof valve, the drill rod is lifted, the switch tool connected with the sending tool is lifted, and the leakage-proof valve can be closed by lifting the switch tool; then, a production pipe column is put in, a switching tool is connected to the lowest end of the production pipe column, and the anti-leakage valve can be opened by putting the switching tool down so as to facilitate generation operation; the anti-leakage valve is lifted for a certain distance, so that the shearing ring 24 abuts against the anchoring claw 232, the anchoring claw 232 is clamped in a fishing buckle of a top packer and fixed in the process of lifting the oil pipe column, the shearing ring 24 moves upwards, one end of the shearing ring 24 is inserted between the anchoring claw 232 and the support sleeve 22, the inclined surface of the shearing ring 24 abuts against the anchoring claw 232, so that the anchoring claw 232 has an opening trend, the shearing ring 24 abuts against the anchoring claw 232, the anchoring claw 232 cannot be separated from the fishing buckle, and therefore the anti-leakage valve is lowered.

The leak-proof valve can also be removed separately downhole, when a large lifting force is applied to the upper end of the leak-proof valve, for example up to 50t, the shear ring 24 shears the shear pin 25, the shear ring 24 then escapes from between the anchoring claw 232 and the support sleeve 22, the anchoring claw 232 can be pulled out of the fishing buckle of the top packer, so that the top packer is separated from the leak-proof valve, and the leak-proof valve can then be removed separately downhole.

Thus, when the leak-proof valve needs to be repaired, the leak-proof valve can be taken out and put down separately again without pulling out the whole underground pipe column.

In a particular embodiment, the anchoring mechanism 2 further comprises a sealing sleeve 26 and a guide shoe 31. The sealing sleeve 26 and the guide shoe 31 are both straight tubes. One end of the sealing sleeve 26 is connected to the support sleeve 22 and the other end of the sealing sleeve 26 is connected to one end of the guide shoe 31. The guide shoe 31 may be threadably connected to the sealing sleeve 26. The end of the guide shoe 31 facing away from the sealing sleeve 26 is tapered.

The bottom end of the guide shoe 31 is tapered to guide the sealing sleeve 26 into the top packer.

In one particular embodiment, as shown in fig. 5 and 6, the anchoring mechanism 2 further includes a first high temperature resistant seal assembly 27. The first high temperature resistant seal assembly 27 includes two first seal rings 271, a plurality of second seal rings 272, and a third seal ring 273. The first sealing ring 271, the second sealing ring 272 and the third sealing ring 273 are all sleeved on the sealing sleeve 26. The first, second and third seal rings 271, 272, 273 each have an outer diameter greater than the outer diameter of the sealing sleeve 26. The first sealing ring 271 and the third sealing ring 273 are made of polyether-ether-ketone, which is a special engineering plastic with excellent properties such as high temperature resistance, self-lubrication, easy processing and high mechanical strength. The second sealing ring 272 is made of teflon. The polytetrafluoroethylene is a high molecular polymer prepared by polymerizing tetrafluoroethylene as a monomer, and has excellent heat resistance.

The two first seal rings 271 are respectively disposed at opposite sides of the third seal ring 273. The plurality of second seal rings 272 are equally divided into two groups. One set of second seal rings 272 is sandwiched between the third seal ring 273 and one first seal ring 271, and the other set of second seal rings 272 is sandwiched between the third seal ring 273 and the other first seal ring 271.

In the present embodiment, a first annular groove facing the second seal ring 272 is provided on one end of the first seal ring 271. A first convex ring is arranged at one end of the second sealing ring 272, which is far away from the third sealing ring 273, and a second annular groove is arranged at one end of the second sealing ring 272, which faces the third sealing ring. Third protruding rings are arranged at two opposite ends of the third sealing ring 273.

The first annular groove on the first seal ring 271 receives the first raised ring of the second seal ring 272 adjacent the first seal ring 271. The second annular groove of one 272 of the adjacent two 272 second seal rings receives the first male ring of the other 272 second seal ring. The two third raised rings on the third sealing ring 273 are received in the second annular grooves of the two second sealing rings 272 adjacent to the third sealing ring 273, respectively. This arrangement can enhance the sealing effect.

In an exemplary embodiment, the sealing sleeve 26 includes a first section 261 and a second section 262. One end of the first segment 261 is connected to one end of the second segment 262. The outer diameter of the first section 261 is larger than the outer diameter of the second section 262. The end of the first section 261 facing away from the second section 262 is connected to the support sleeve 22 and the second section 262 is connected to the guide shoe 31 facing away from the first end.

As shown in fig. 7, the anchoring mechanism 2 further includes a second high temperature resistant seal assembly 32. The second high temperature resistant seal assembly 32 includes an outer retaining ring 28, a first C-ring 321, a first spacer 291, a second C-ring 322, a second spacer 292, a third C-ring 323, a third spacer 293, a fourth C-ring 324, and an adjustment ring 30. The outer positioning ring 28, first C-ring 321, first spacer 291, second C-ring 322, second spacer 292, third C-ring 323, third spacer 293, fourth C-ring 324, and adjusting ring 30 are each annular. The cross sections of the first C-shaped ring 321, the second C-shaped ring 322, the third C-shaped ring 323 and the fourth C-shaped ring 324 are C-shaped. The outer positioning ring 28, first C-ring 321, first spacer 291, second C-ring 322, second spacer 292, third C-ring 323, third spacer 293, fourth C-ring 324, and adjustment ring 30 are, in turn, fitted over the second section 262 of the sealing sleeve. The end of the outer positioning ring 28 facing away from the first C-ring 321 also abuts against a first high temperature seal assembly 27, and the first high temperature seal assembly 27 is sandwiched between the end face of the first segment 261 and the outer positioning ring 2828.

The adjustment ring 30 and the outer positioning ring 28 clamp the first C-shaped ring 321, the first spacer 291, the second C-shaped ring 322, the second spacer 292, the third C-shaped ring 323, the third spacer 293 and the fourth C-shaped ring 324 such that the first C-shaped ring 321, the second C-shaped ring 322, the third C-shaped ring 323, the fourth C-shaped ring 324 have an elastic deformation expanding radially outward. In this way, the second high temperature seal assembly 32 can seal the gap between the seal sleeve 26 and the upper packer, and the second high temperature seal assembly 32 can withstand temperatures above 350 ℃.

In an exemplary embodiment, the anchoring mechanism 2 further includes a graphite sealing ring 33. One end of the sealing sleeve 26 is fitted over the support sleeve 22. A graphite sealing ring 33 is fitted over the support sleeve 22 and is disposed between the sealing sleeve 26 and the support sleeve 22. The outer peripheral wall of the graphite seal ring 33 is in contact with the inner axial wall of the seal sleeve 26, and the inner peripheral wall of the graphite seal ring 33 is in contact with the outer peripheral wall of the support sleeve 22. Graphite sealing ring 33 seals the gap between sealing sleeve 26 and support sleeve 22.

In an exemplary embodiment, the lower connector 115 is further provided with a mounting groove 1531 on an inner circumferential wall of an end thereof adjacent to the second valve seat 153. The mounting groove 1531 has a ring shape.

The valve body 1 also includes a fifth C-ring 1531. The fifth C-shaped ring 1531 has a ring shape, and the fifth C-shaped ring 1531 has a C-shaped cross section. A fifth C-ring 1531 fits over second valve seat 153 and is seated in mounting groove 1531. The inner peripheral wall of the fifth C-ring 1531 abuts against the outer peripheral wall of the second valve seat 153, and the outer peripheral wall of the fifth C-ring 1531 abuts against the inner peripheral wall of the lower joint 115. A fifth C-ring 1531 can seal the gap between the lower joint 115 and the second valve seat 153.

In an exemplary embodiment, the valve body 1 further includes a retaining ring 155. The retaining ring 155 includes a barrel 1551 and a stop ring 1552. The cylinder 1551 is sleeved at one end of the lower joint 115 close to the valve core 151. One end of the cylinder 1551 is in snap connection with the lower connector 115. A stopper ring 1552 extends radially inward from the inner circumferential wall of the other end of the cylinder 1551. A retainer ring 1552 covers an end surface of the lower joint 115 near one end of the spool 151 and extends to a position near the second valve seat 153. The stopper 1552 prevents the fifth C-shaped ring 1531 from being removed from the mounting groove 1531.

In one particular embodiment, the ball valve assembly 15 further includes a resilient member 154. The elastic member 154 may be a seat spring, a compression spring, or a disc spring. The elastic member 154 is disposed between the first valve seat 152 and the restricting protrusion 1161. One end of the elastic element 154 abuts against the first valve seat 152, and the other end of the elastic element 154 abuts against the limiting protrusion 1161. The resilient member 154 is in a compressed state. The elastic member 154 applies an elastic force to the first valve seat 152 adjacent to the second valve seat 153. The elastic member 154 causes the first and

second valve seats

152 and 153 to abut on the valve core 151. The sealing between the first valve seat 152 and the spool 151 and between the second valve seat 153 and the spool 151 is strengthened.

In this embodiment, the sealing elements in the leakage prevention valve are all high temperature resistant sealing elements, can bear the high temperature of more than 350 ℃, and can meet the requirement of the whole life cycle exploitation of the offshore oilfield thermal production well.

In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" word structure "and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and thus, is not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, or may be connected through two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A leak resistant valve, comprising:

a valve body comprising

A housing configured as a straight-bar-shaped cylinder;

a ball valve assembly comprising

the valve core is clamped between the first valve seat and the second valve seat, is provided with a through hole penetrating through the valve core, and the outer peripheral surface of the valve core comprises a spherical surface abutting against the first valve seat and the second valve seat; an anchoring mechanism comprising

A connection joint, one end of which is connected with the shell;

an anchor comprising

the end surfaces of the first valve seat and the second valve seat, which are abutted against the valve core, are spherical surfaces, the anchoring claw is provided with a plurality of protruding parts, and the protruding parts protrude from one side, which is away from the supporting sleeve, of the anchoring claw in the direction away from the supporting sleeve.

2. A leak protection valve as defined in claim 1, wherein:

the anchoring claws are provided in plurality and are uniformly wound around the support sleeve.

3. A leak protection valve as defined in claim 1, wherein:

the projection is located at one end of the anchoring claw away from the sleeve.

4. A leak-proof valve according to claim 1 or 2, characterized in that:

the anchoring mechanism further comprises:

a sealing sleeve, one end of which is connected with one end of the supporting sleeve which is far away from the connecting joint;

and one end of the guide shoe is connected to the other end of the sealing sleeve, and the other end of the guide shoe is in a conical shape.

5. The leak-proof valve as defined in claim 4, wherein:

the anchoring mechanism further comprises a first high temperature resistant seal assembly;

the first high temperature resistant seal assembly includes:

the two first sealing rings are sleeved on the sealing sleeve;

the second sealing rings are sleeved on the sealing sleeve and are positioned between the two first sealing rings;

the third sealing rings are sleeved on the sealing sleeve and divide the second sealing rings into two groups;

the first sealing ring and the third sealing ring are made of polyether-ether-ketone, and the second sealing ring is made of polytetrafluoroethylene.

6. The leak-proof valve as claimed in claim 5, wherein:

a first annular groove facing the second sealing ring is formed in one end of the first sealing ring;

a first convex ring is arranged at one end of the second sealing ring, which is far away from the third sealing ring, and a second annular groove is arranged at one end of the second sealing ring, which is towards the third sealing ring;

the two opposite ends of the third sealing ring are provided with third convex rings;

the first annular groove on the first sealing ring is used for accommodating a first convex ring of a second sealing ring adjacent to the first sealing ring; the second annular groove of one of the two adjacent second sealing rings is used for accommodating the first convex ring of the other second sealing ring; the two third convex rings are respectively accommodated in the second annular grooves of the two second sealing rings adjacent to the third sealing ring.

7. The leak-proof valve as claimed in claim 5, wherein:

the anchoring mechanism further comprises a second high temperature resistant seal assembly;

the second high-temperature-resistant sealing assembly comprises an outer positioning ring, a first C-shaped ring, a first spacer ring, a second C-shaped ring, a second spacer ring, a third C-shaped ring, a third spacer ring, a fourth C-shaped ring and an adjusting ring which are sequentially sleeved on the sealing sleeve;

wherein the adjustment ring and the outer positioning ring clamp the first C-ring, the first spacer ring, the second C-ring, the second spacer ring, the third C-ring, the third spacer ring, and the fourth C-ring such that the first C-ring, the second C-ring, the third C-ring, and the fourth C-ring have a radially outwardly expanding elastic deformation.

8. The leak-proof valve as defined in claim 4, wherein:

one end of the sealing sleeve is sleeved on the supporting sleeve;

the anchoring mechanism also comprises a graphite sealing ring sleeved on the supporting sleeve;

the peripheral wall butt of graphite sealing ring in the internal perisporium of sealing sleeve, the internal perisporium butt of graphite sealing ring in the peripheral wall butt of support sleeve.

9. A leak protection valve as defined in claim 1, wherein:

a limiting bulge is arranged in the shell and is arranged on one side, away from the second valve seat, of the first valve seat;

the second valve seat is fixed on the shell, and the first valve seat can slide along the shell;

the ball valve assembly further comprises an elastic piece, one end of the elastic piece abuts against the limiting protrusion, the other end of the elastic piece abuts against the first valve seat, and the elastic piece is in a compressed state.

10. A leak protection valve as defined in claim 1, wherein:

the ball valve assembly also comprises two control pins which are respectively arranged on two opposite sides of the valve core, the two control pins are aligned, the axis of the control pin and the extension line thereof are not larger than the center of the valve core, and the axis of the control pin is also vertical to the axis of the through hole;

the inner wall of the shell is also provided with a first groove and a second groove, and the first groove and the second groove are both arranged on one side of the first valve seat, which is far away from the second valve seat;

the valve body further includes a drive assembly, the drive assembly including:

an elastic claw disposed in the housing, including

The supporting sleeve is coaxially arranged with the shell;

the first elastic claw extends out from one end of the support sleeve in the direction away from the support sleeve, and a first bulge is arranged on one side of the first elastic claw close to the shell;

the second elastic claw extends out from the other end of the support sleeve in the direction away from the support sleeve, and a second bulge is arranged on one side of the second elastic claw, which is close to the shell;

the connecting sleeve is arranged at one end of the second elastic claw, which is far away from the supporting sleeve;

one end of the connecting pipe column is connected with the connecting sleeve;

one ends of the two operating pins are connected to the other end of the connecting pipe column, and the two operating pins are respectively abutted against the two control pins;

wherein the first and second resilient jaws each have a tendency to flare outwardly in a radial direction of the housing,

the elastic claw can slide along the axial direction of the shell in the direction away from the valve core until the first bulge is sunk into the first groove, and the elastic claw drives the valve core to rotate to a position where the axis of the through hole of the valve core is vertical to the axis of the first valve seat through the connecting pipe column, the operating pin and the control pin;

the elastic claw slides to the direction close to the valve core along the axial direction of the shell until the second bulge is sunk into the second groove, and the elastic claw drives the valve core to rotate to the position where the axis of the through hole of the valve core is parallel to the axis of the first valve seat through the connecting pipe column, the operating pin and the control pin.