CN212317939U

CN212317939U - Downhole safety valve

Info

Publication number: CN212317939U
Application number: CN202021123052.5U
Authority: CN
Inventors: 杜晓雷; 付豪; 薛蓥; 丁英楠; 钟宝库; 刘志刚; 房新扬; 曲艳灵
Original assignee: Top Well Petroleum Technologies Co ltd
Current assignee: Top Well Petroleum Technologies Co ltd
Priority date: 2020-06-17
Filing date: 2020-06-17
Publication date: 2021-01-08
Anticipated expiration: 2030-06-17

Abstract

The utility model discloses a relief valve in pit, include: the main body, piston assembly and valve plate, sealing element, butt joint device installed in the main body; a hydraulic cavity is formed between the upper end of the piston assembly and the main body, and the lower end of the piston assembly is matched with the valve plate; the main body is provided with a transfusion channel communicated with the hydraulic cavity, the transfusion channel is communicated to the end face of the main body, the sealing element is arranged in the transfusion channel from the end face side of the main body, the main body is also provided with a radial channel communicated with the transfusion channel, an inner boss is arranged in the main body above the hydraulic cavity, a liquid outlet channel communicated with the radial channel is arranged on the inner boss, and the butt joint device is arranged in the liquid outlet channel in a sealing manner. The control pipeline connected with the butt joint device is arranged in the pipe column, a clamp used for fixing the control pipeline does not need to be installed on the outer wall of the pipe column, when the well is overhauled, the butt joint device is unloaded from the safety valve through the control pipeline, the operation of preventing the pipe column from being blown up can be conveniently carried out, the pipe column pulling speed can be greatly improved, and potential safety hazards are avoided.

Description

Downhole safety valve

Technical Field

The utility model belongs to the technical field of the oil field oil recovery gas production instrument technique and specifically relates to a relief valve in pit.

Background

The underground safety valve is installed in an oil gas well, and can timely close an underground production channel when a production facility is in a state of out of control due to fire alarm, pipeline breakage and irresistible natural disasters (such as earthquake, ice condition, strong typhoon and the like), so as to prevent environmental pollution and other safety accidents caused by oil gas leakage. As shown in fig. 1, the general working principle of the downhole safety valve is as follows: hydraulic oil is added from the ground, high-pressure liquid enters a hydraulic cavity e through a control pipeline a, a piston b is pushed to move downwards, a spring c is compressed, and the piston b jacks a valve plate d, so that an underground safety valve is opened; the underground safety valve keeps an open state when the ground control pressure is kept; the ground control pressure is released, and the valve plate d resets under the action of a torsion spring at the rotating shaft of the valve plate d, so that the underground safety valve is closed.

As shown in fig. 1, a control pipeline a of a conventional downhole safety valve is designed outside an oil pipe and connected to a pipe wall outside the downhole safety valve, and is clamped to the outer wall of the oil pipe by a pipeline clamp in a high-pressure well workover process, and the installation position of the control pipeline a brings huge workload and construction risk to the lifting of a pipe column for blowout prevention operation in the high-pressure oil, gas and water well workover process.

SUMMERY OF THE UTILITY MODEL

Problem to prior art existence, the utility model aims to provide a relief valve in pit can solve this technical problem of blowout prevention operation string through this relief valve in pit and control pipeline's butt joint well.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

a downhole safety valve comprising: the main body, piston assembly and valve plate, sealing element, butt joint device installed in the main body; a hydraulic cavity is formed between the upper end of the piston assembly and the main body, and the lower end of the piston assembly is matched with the valve plate; the main body is provided with a transfusion channel communicated with the hydraulic cavity, the transfusion channel is communicated with the end face of the main body, the sealing element is arranged in the transfusion channel from the end face side of the main body, the main body is also provided with a radial channel communicated with the transfusion channel, an inner boss is arranged in the main body above the hydraulic cavity, the inner boss is provided with a liquid outlet channel communicated with the radial channel, and the butt joint device is hermetically arranged in the liquid outlet channel.

Further, the downhole safety valve further comprises a sliding sleeve, the liquid outlet channel penetrates through the inner boss, the liquid outlet channel comprises a first hole section located on the upper portion and a second hole section located on the lower portion, the inner diameter of the first hole section is smaller than that of the second hole section, the second hole section is communicated with the radial channel, the sliding sleeve is installed in the second hole section, the outer wall of the sliding sleeve is attached to the inner wall of the second hole section, and a shear pin used for limiting the sliding sleeve is further installed in the second hole section, so that the sliding sleeve seals the radial channel.

Furthermore, the upper side and the lower side of the inner wall of the second hole section, which are communicated with the radial channel, are provided with first sealing grooves, the first sealing grooves are positioned at the matching position of the second hole section and the sliding sleeve, and first sealing rings are installed in the first sealing grooves.

Further, the dock includes: the first column section is matched with the first hole section, and a sealing sleeve and a first limiting shear pin are sleeved at the lower part of the first column section; the outer diameter of the seal sleeve is matched with the second hole section; the sealing sleeve is provided with a first radial positioning hole, and the first limiting shear pin penetrates through the first positioning hole to fix the sealing sleeve to the first column section; the outer wall of first post section sets up card annular and seal ring groove, seal ring capping up end with the distance of card annular is greater than first hole section with the axial length sum of sliding sleeve, seal ring groove sets up card annular with between the seal cover, card annular with distance between the seal ring groove is less than the axial length of first hole section, install the snap ring in the card annular, install the sealing ring in the seal ring groove.

Furthermore, the butt joint device further comprises an annular limiting sleeve and a second limiting shear pin, the outer diameter of the limiting sleeve is larger than the inner diameter of the second hole section, the limiting sleeve is provided with a radial second positioning hole, the second limiting shear pin penetrates through the second positioning hole to fix the limiting sleeve to the lower end of the first column section, and the distance from the upper end face of the limiting sleeve to the clamping ring groove is larger than or equal to the thickness of the inner boss.

Further, the inner wall and the outer wall of the seal sleeve are both provided with a second seal groove, and a second seal ring is installed in the second seal groove.

The utility model discloses a relief valve in pit seals liquid outlet channel through the butt joint ware, when the relief valve is opened to needs, opens the sealing member and passes through infusion passageway to hydraulic pressure intracavity input hydraulic oil, and the relief valve opens the back, seals the infusion passageway with the sealing member, when taking place the incident, lifts the butt joint ware off, to hydraulic pressure chamber pressure release to the valve plate resets under its torsion spring effect and covers the piston cylinder port department that closes piston assembly. The butt joint device is arranged in the safety valve body, correspondingly, a control pipeline connected with the butt joint device is arranged in the pipe column, a clamp used for fixing the control pipeline does not need to be arranged on the outer wall of the pipe column, when the well is overhauled, the butt joint device is unloaded from the safety valve through the control pipeline, the operation of preventing the pipe column from being blown up can be conveniently carried out, the pipe blowing-up speed of the blowout prevention operation can be greatly improved, and potential safety hazards are avoided.

Drawings

FIG. 1 is a schematic diagram of a hydraulic control line connected to a downhole safety valve in the prior art;

fig. 2 is a schematic structural diagram of a downhole safety valve provided in embodiment 1 of the present invention;

FIG. 3 is an enlarged partial schematic view of FIG. 2;

fig. 4 is a schematic structural view of a docking adapter according to embodiment 1 of the present invention;

fig. 5 is a schematic view illustrating the butt joint installation of the butt joint device and the downhole safety valve in embodiment 1 of the present invention;

fig. 6 is a schematic structural view of a local sealing state of the butt-joint device and the downhole safety valve in embodiment 1 of the present invention;

fig. 7 is a schematic view of the butt-joint device after being separated from the downhole safety valve in embodiment 1 of the present invention;

fig. 8 is a schematic structural view of a downhole safety valve provided in embodiment 2 of the present invention;

in the figure:

1. a seal member; 2. a body; 21. a fluid infusion channel; 22. an inner boss; 23. a radial channel; 24. a liquid outlet channel; 241. a first bore section; 242. a second bore section; 243. a first seal ring; 3. a sliding sleeve; 4. shearing the nails; 5. a piston assembly; 51. a piston cylinder; 6. a spring; 7. a valve plate; 8. a hydraulic chamber; 9. a butt joint device; 91. a first column section; 92. a snap ring; 93. a seal ring; 94. sealing sleeves; 941. a second seal ring; 95. a first limiting shear pin; 96. a limiting sleeve; 97. a second limiting shear pin; 98. connecting screw threads; 10. and connecting the joints.

Detailed Description

To clearly illustrate the design concept of the present invention, the following description is made with reference to the examples.

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention are described below clearly and completely with reference to the drawings in the examples of the present invention, and it is obvious that the described examples are only a part of examples of the present invention, but not all examples. Based on the middle examples of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish similar items and are not to be construed as requiring a particular order or sequence, and it is to be understood that such uses are interchangeable under appropriate circumstances.

The utility model provides a relief valve in pit, include: the main body, piston assembly and valve plate, sealing element, butt joint device installed in the main body; a hydraulic cavity is formed between the upper end of the piston assembly and the main body, and the lower end of the piston assembly is matched with the valve plate; the main body is provided with a transfusion channel communicated with the hydraulic cavity, the transfusion channel is communicated to the end face of the main body, the sealing element is arranged in the transfusion channel from the end face side of the main body, the main body is also provided with a radial channel communicated with the transfusion channel, an inner boss is arranged in the main body above the hydraulic cavity, a liquid outlet channel communicated with the radial channel is arranged on the inner boss, and the butt joint device is arranged in the liquid outlet channel in a sealing manner.

The utility model discloses a relief valve in pit seals liquid outlet channel through the butt joint ware, when the relief valve is opened to needs, opens the sealing member and passes through infusion passageway to hydraulic pressure intracavity input hydraulic oil, and the relief valve opens the back, seals the infusion passageway with the sealing member, when taking place the incident, lifts the butt joint ware off, to hydraulic pressure chamber pressure release to the valve plate resets under its torsion spring effect and covers the piston cylinder port department that closes piston assembly. The butt joint device is arranged in the safety valve body, correspondingly, a control pipeline connected with the butt joint device is arranged in the pipe column, a clamp used for fixing the control pipeline does not need to be arranged on the outer wall of the pipe column, when the well is overhauled, the butt joint device is unloaded from the safety valve through the control pipeline, the operation of preventing the pipe column from being blown up can be conveniently carried out, the pipe-pulling speed of the blowout-preventing operation can be greatly improved, and potential safety hazards are avoided.

In order to clarify the technical solution of the present invention, the present invention will be described in detail with reference to the accompanying drawings and embodiments. The embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Example 1

As shown in fig. 2-7, a first embodiment of the present invention is provided for a downhole safety valve comprising: the main body 2, a piston assembly 5 and a valve plate 7 which are all arranged in the main body 2, a sealing element 1 and a butt joint device 9; in this embodiment, as shown in fig. 2, the main body 2 is a casing located outside the downhole safety valve, the piston assembly 5 includes a piston cylinder 51, a spring 6 and a sealing ring installed in a sealing groove above the piston cylinder 51, the valve plate 7 is fixed inside the main body 2 through a rotating shaft, a torsion spring is installed on the rotating shaft, the torsion spring drives the valve plate 7 to return, and the sealing element 1 is a plug.

A hydraulic cavity 8 is formed between the upper end of a piston cylinder 51 of the piston assembly 5 and the main body 2, and the lower end of the piston cylinder 51 of the piston assembly 5 is matched with the valve plate 7; the main body 2 is provided with a liquid conveying channel 21 communicated with the hydraulic cavity 8, the liquid conveying channel 21 is communicated with the end face of the main body 2, the plug is arranged in the liquid conveying channel 21 from the end face side of the main body, obviously, an internal thread matched with the plug is arranged at the port part of the liquid conveying channel 21, the main body 2 is further provided with a radial channel 23 communicated with the liquid conveying channel 21, an inner boss 22 is arranged in the main body 2 above the hydraulic cavity 8, a liquid outlet channel 24 communicated with the radial channel 23 is arranged on the inner boss 22, and the butt joint device 9 is hermetically arranged in the liquid outlet channel 24.

Preferably, as shown in fig. 2, 5, 6 and 7, the liquid outlet channel 24 penetrates through the inner boss 22, the liquid outlet channel 24 comprises a first hole section 241 at the upper part and a second hole section 242 at the lower part, the inner diameter of the first hole section 241 is smaller than that of the second hole section 242, and the second hole section 242 is communicated with the radial channel 23. The sliding sleeve 3 of the downhole safety valve is installed in the second hole section 242, the outer wall of the sliding sleeve 3 is attached to the inner wall of the second hole section 242, shear nails 4 used for limiting the sliding sleeve are further installed in the second hole section 242, and the radial channel 23 is sealed by the sliding sleeve 3 through the limitation of the shear nails 4. As shown in fig. 3, first sealing grooves are disposed on both upper and lower sides of an inner wall of the second bore section 242 communicating with the radial passage 23, the first sealing grooves are located at a matching position of the second bore section 242 and the sliding sleeve 3, and a first sealing ring 243 is installed in the first sealing groove. Therefore, even if the butting connector 9 is not butted and installed in the liquid outlet channel 24, the sliding sleeve 3 can generate a sealing effect on the liquid outlet channel 24, and the function of preventing hydraulic oil from leaking is achieved.

As shown in fig. 4, the docking unit 9 includes a first column section 91 fitted with the first hole section 241, a sealing sleeve 94 fitted to a lower portion of the first column section 91, the sealing sleeve 94 having an outer diameter fitted with the second hole section 242; the sealing sleeve 94 is provided with a first radial positioning hole, and a first limiting shear pin 95 penetrates through the first positioning hole to fix the sealing sleeve 94 to the first column section 91; the outer wall of the first column section 91 is provided with a clamping ring groove and a sealing ring groove, the distance between the upper end surface of the sealing sleeve 94 and the clamping ring groove is greater than the sum of the axial lengths of the first hole section 241 and the sliding sleeve 3, the clamping ring groove can extend out of the first hole section 241, and a clamping ring 92 is arranged in the clamping ring groove; the seal ring groove is arranged between the clamp ring groove and the seal sleeve, the distance between the clamp ring groove and the seal ring groove is smaller than the axial length of the first hole section 241, and the seal ring 93 mounted on the seal ring groove can be ejected out of the first hole section 241. The butt joint device 9 further comprises an annular limiting sleeve 96 and a second limiting shear pin 97, the outer diameter of the limiting sleeve 96 is larger than the inner diameter of the second hole section 242, the limiting sleeve 96 is provided with a radial second positioning hole, the second limiting shear pin 97 penetrates through the second positioning hole to fix the limiting sleeve 96 to the lower end of the first column section 91, the distance from the upper end face of the limiting sleeve 96 to the clamping ring groove is larger than or equal to the thickness of the inner boss 22, the butt joint device 9 is guaranteed to be installed in the liquid outlet channel 24 from the lower end of the inner boss 22, when the butt joint device 9 is sealed with the liquid outlet channel, the clamping ring groove can expose the upper end face of the inner boss 22, and the clamping ring 92 is separated from the clamping ring. To facilitate the retention of the stop collar 96, in this embodiment, the inner diameter of the stop collar 96 is matched to the outer diameter of the first column section 91.

It will be appreciated that in order to mount the first and second restraining clips 95, 97 to the first column section 91, annular grooves are provided at corresponding positions of the first column section 91 to facilitate the mounting and fixing of the first and second restraining clips 95, 97.

In this embodiment, the inner wall and the outer wall of the sealing sleeve 94 are both provided with a second sealing groove, and the second sealing ring 941 is installed in the second sealing groove, so as to ensure effective sealing of the sealing sleeve 94 with the first column section 91 and the inner wall of the second hole section 241 when the butt-joint device is installed in the liquid outlet channel 24 in a sealing manner.

In this embodiment, a connection screw 98 is provided at the upper end face of the first column section 91 for connection with the connection nipple 10 of the control line for the operation of pulling up the abutment 9 and pulling up the abutment 9 out of the outlet passage 24.

As shown in fig. 5-7, reflecting the method of use and the principle of action of the downhole safety valve in this embodiment:

the process of the downhole safety valve entering the well: as shown in fig. 5, after the control pipeline is connected with the butt joint device through the connecting joint 10, the control pipeline is suspended on the liquid outlet channel 24 penetrating through the inner boss 22 in the downhole safety valve, the downhole safety valve is in a sealing state, and at the time, the snap ring 92 and the sealing ring 93 are respectively sleeved in the snap ring groove and the sealing ring groove arranged on the first column section;

the butt joint of the butt joint device and the underground safety valve and the opening process of the underground safety valve are as follows: after the tubing string is put down, a control pipeline is fished by a fishing tool through steel wire operation or other operation and certain tensile force is lifted, so that a butt joint device connected with the lower end of the control pipeline is in butt joint with a liquid outlet channel 24 of the underground safety valve, as shown in fig. 6, in the butt joint process, a sliding sleeve 3 moves upwards, a radial channel 23 is sealed by the butt joint device 3, a first column section 91 is lifted by the control pipeline, the butt joint device 9 is fixed through a first limiting shear pin 5, at the moment, a clamping ring 92 is separated from a clamping ring groove, a wellhead underground control pipeline control system is connected and a wellhead production is installed, a plug is opened, hydraulic oil is input into a hydraulic cavity 8 through a fluid conveying channel 21, after the underground safety valve is opened, the fluid conveying channel 21 is closed again through the plug after the underground safety valve is opened;

closing the underground safety valve and lifting the pipe column: the wellhead is disassembled, the control pipeline is lifted by increasing the force, the second limiting shear pin on the butt joint device 9 is broken, the limiting sleeve 96 falls off from the first column section 91, the first column section 91 is separated from the liquid outlet channel 24, the pressure relief of the hydraulic cavity 8 is completed, the underground safety valve is automatically closed, and thus, due to the fact that the influence of the fixed control pipeline clamp is avoided, the blowout prevention operation is started up to be out of the underground pipe column and matched tools, the construction difficulty and safety risk are greatly reduced, and the working efficiency is improved.

It should be noted that, in the above process, the docking adapter 9 can realize sealing with the downhole safety valve, so as to ensure opening of the downhole safety valve, and can also perform pressure relief on the hydraulic chamber 8, so as to realize closing of the downhole safety valve.

Example 2

As shown in fig. 8, this embodiment is an improvement of the structure of the downhole safety valve in addition to embodiment 1, in that the liquid outlet passage 24 communicates with the radial passage 23 but does not penetrate the inner boss 22. The abutment, which may be a screw connected to the control line, a connection nipple connected to the control line, etc., is sealed off from the outlet channel before the string is run downhole. When needing to close the downhole safety valve, equally discharge the butt joint ware from liquid outlet channel 24, hydraulic oil flows into the inside of body 2 along liquid outlet channel 24 equally, accomplishes the pressure release of hydraulic pressure chamber 8, and the downhole safety valve is closed by oneself, like this, because there is not the influence of fixed control pipeline checkpost, prevents that the blowout operation plays downhole tubular column and supporting tool very conveniently and rapidly, has reduced the construction degree of difficulty and safe risk greatly, has improved work efficiency.

In the above embodiments, the terms "upper" and "lower" refer to the relative directions of the downhole safety valve in use.

Finally, it is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and these changes and modifications are to be considered as the protection scope of the invention.

Claims

1. A downhole safety valve, comprising: the main body (2), a piston assembly (5) and a valve plate (7) which are all arranged in the main body (2), a sealing element (1) and a butt joint device (9); a hydraulic cavity (8) is formed between the upper end of the piston assembly (5) and the main body (2), and the lower end of the piston assembly (5) is matched with the valve plate (7); the main body (2) is provided with a liquid conveying channel (21) communicated with the hydraulic cavity (8), the liquid conveying channel (21) is communicated with the end face of the main body (2), the sealing element (1) is installed in the liquid conveying channel (21) from the end face side of the main body, the main body (2) is further provided with a radial channel (23) communicated with the liquid conveying channel (21), an inner boss (22) is arranged in the main body (2) above the hydraulic cavity (8), a liquid outlet channel (24) communicated with the radial channel (23) is arranged on the inner boss (22), and the butt joint device (9) is installed in the liquid outlet channel (24) in a sealing mode.

2. A downhole safety valve according to claim 1, further comprising a sliding sleeve (3), wherein the liquid outlet channel (24) penetrates through the inner boss (22), the liquid outlet channel (24) comprises a first hole section (241) at an upper part and a second hole section (242) at a lower part, the inner diameter of the first hole section (241) is smaller than the inner diameter of the second hole section (242), the second hole section (242) is communicated with the radial channel (23), the sliding sleeve (3) is installed in the second hole section (242), the outer wall of the sliding sleeve (3) is abutted with the inner wall of the second hole section (242), and a shear pin (4) for limiting the sliding sleeve (3) is further installed in the second hole section (242) to enable the sliding sleeve (3) to close the radial channel (23).

3. A downhole safety valve according to claim 2, wherein a first sealing groove is provided at both upper and lower sides of the inner wall of the second bore section (242) communicating with the radial passage (23), the first sealing groove being located at the engagement of the second bore section (242) with the sliding sleeve (3), and a first sealing ring (243) is installed in the first sealing groove.

4. A downhole safety valve according to claim 2, wherein the dockee (9) comprises: the first column section (91) is matched with the first hole section (241), a sealing sleeve (94) is sleeved on the lower portion of the first column section (91), and a first limiting shear pin (95) is arranged; the seal sleeve (94) having an outer diameter that mates with the second bore section (242); the sealing sleeve (94) is provided with a first radial positioning hole, and the first limiting shear pin (95) penetrates through the first positioning hole to fix the sealing sleeve (94) to the first column section (91); the outer wall of first post section (91) sets up card annular and seal ring groove, seal cover (94) up end with the distance of card annular is greater than first hole section (241) with the axial length sum of sliding sleeve (3), seal ring groove sets up the card annular with between the seal cover (94), the card annular with distance between the seal ring groove is less than the axial length of first hole section (241), install snap ring (92) in the card annular, install sealing ring (93) in the seal ring groove.

5. A downhole safety valve according to claim 4, wherein the abutment (9) further comprises an annular stop collar (96) and a second stop shear pin (97), the stop collar (96) having an outer diameter larger than an inner diameter of the second bore section (242), the stop collar (96) being provided with a second radial locating hole through which the second stop shear pin (97) passes to fix the stop collar (96) to the lower end of the first column section (91), the distance from the upper end surface of the stop collar (96) to the snap ring groove being larger than or equal to the thickness of the inner ledge (22).

6. A downhole safety valve according to claim 4 or 5, wherein the inner and outer walls of the sealing sleeve (94) are each provided with a second sealing groove into which a second sealing ring (941) is fitted.