Casing vent valve

Abstract

The present application relates to the technical fields of casing pressure control of oilfield production well, and is a casing vent valve, which comprises a valve body, a valve ball, a valve rod, a driving mechanism, an adjusting valve and a control valve, a left end of the valve body is provided with a left-right through exhaust passage in the center, and the right part of the valve body is provided with an exhaust port communicated with the right part of the exhaust passage. The present application has reasonable and compact structure, and when in use, the left side of the valve body is installed together with the casing, when the pressure in the casing is higher than the set value, the exhaust passage and the exhaust port can be communicated by controlling the driving mechanism, so as to exhaust and depressurize the casing, when the casing pressure is in the set interval, the exhaust passage and the exhaust port can be disconnected by controlling the driving mechanism, through such setting, the casing pressure can be stably controlled, the casing pressure of different oil wells can reach the set requirement, the influence of gas on pump work diagram is reduced, and the submergence interval is reasonably set.

Description

Technical Field

[0001] This invention relates to the field of casing pressure control technology for oilfield production wells, and is a casing venting valve. Background Technology

[0002] Casing pressure is one of the most important parameters in oil well production. Its changes and fluctuations directly affect the well's submergence, crude oil production, pump efficiency, and wax deposition. During oil well production, when the bottom hole pressure is lower than the saturation pressure, natural gas separates from the crude oil. Some of the separated natural gas accumulates in the annular space between the casing and the oil well, creating casing pressure. If the casing pressure is too high, it forces the dynamic fluid level to drop. When the dynamic fluid level drops to the inlet of the deep well pump, gas enters the pump, reducing pump efficiency, causing well production to stop, and in severe cases, gas lock-up. Currently, the traditional method of mechanical manual adjustment is used to control casing pressure in the field, or different pressures are applied to the spring using handwheels and set screws to set different constant pressures for valve opening. However, there are still technical bottlenecks such as inconvenient adjustment, valve jamming, and inability to monitor in real time. Summary of the Invention

[0003] This invention provides a casing venting valve that overcomes the shortcomings of the prior art and effectively solves the problems of inconvenient adjustment and valve jamming in the existing traditional methods of controlling casing pressure.

[0004] The technical solution of the present invention is achieved through the following measures: a sleeve venting valve includes a valve body, a valve ball, a valve stem, a drive mechanism, a regulating valve, and a control valve. A through-flow venting channel is provided at the center of the left end of the valve body. An vent port communicating with the right side of the venting channel is provided on the outer side of the right side of the valve body. A valve ball, which can be rotated to connect and disconnect the vent port from the venting channel, is installed in the venting channel at the corresponding vent position. A valve stem, with its right end sealed and passing through the venting channel, is fixedly installed on the outer side of the right side of the valve ball. A drive mechanism capable of driving the valve stem to rotate is installed on the right side of the valve body. A control channel communicating with the left side of the venting channel is provided on the upper side of the valve body at the position corresponding to the left of the vent. A first mounting channel and a second mounting channel are provided at intervals on the upper side of the left side of the valve body. The lower ends of the first and second mounting channels are both connected to the control channel. A regulating valve capable of opening and closing the first mounting channel is provided on the outer side of the left side of the valve body. A control valve capable of connecting and disconnecting the venting channel from the first and second mounting channels is provided on the outer side of the valve body at the corresponding control channel position.

[0005] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0006] The aforementioned exhaust passage may include a first straight hole section, a conical hole section, a second straight hole section, and a third straight hole section, which are connected sequentially from left to right and have gradually increasing diameters. The control passage is connected to the first straight hole section. The outer side of the left part of the valve ball is in sealing contact with the inner wall of the conical hole section. A sealing outer ring platform is fixed on the outer side of the middle part of the valve ball. The outer ring surface of the sealing outer ring platform is in sealing contact with the inner wall of the second straight hole section. The outer ring surface of the sealing outer ring platform is provided with a connecting hole. The other end of the connecting hole extends to the outer side of the left part of the valve ball and is connected to the first straight hole section. The upper end of the exhaust port is located on the inner wall of the first straight hole section corresponding to the connecting hole. The lower end of the exhaust port extends to the lower right side of the valve body. A valve seat is rotatably installed on the outer side of the valve stem corresponding to the right side of the valve ball. A fixing seat fitted on the outer side of the valve stem is fixedly installed on the inner side of the right part of the third straight hole section. A sealing element is fitted on the outer side of the valve stem corresponding to the position between the left side of the fixing seat and the right side of the valve seat.

[0007] The diameter of the connecting hole, the width of the sealing outer ring platform, and the length of the second straight hole section increase sequentially.

[0008] The diameters of the first and second mounting channels can be the same, and the distance between the lower end of the first mounting channel and the upper side of the valve body is the same as the distance between the lower end of the second mounting channel and the upper side of the valve body.

[0009] The aforementioned control channel may include a first connecting section, a second connecting section, and a third connecting section that are connected from top to bottom and whose diameters gradually decrease. The lower end of the third connecting section is connected to the first straight hole section. The lower ends of the first and second mounting channels are both located on the inner wall of the first connecting section. The inner wall of the second connecting section is tapered, with a larger upper section and a smaller lower section. The control valve includes a control valve core, a control rod, and a mounting seat. The mounting seat is sealed and fixedly installed in the first connecting section corresponding to the position above the lower end of the first mounting channel. The control rod with its lower end located on the inner side of the lower part of the first connecting section is sealed and screwed to the center of the mounting seat. The control valve core is fixedly installed at the lower end of the control rod corresponding to the position below the lower end of the first mounting channel. The outer side of the lower part of the control valve core is in sealed contact with the inner wall of the upper part of the second connecting section.

[0010] The valve body at the position between the first installation channel and the mounting seat may be provided with an upward-opening mounting groove. The lower part of the mounting groove is connected to the upper part of the first installation channel, and the regulating valve is installed in the mounting groove.

[0011] The upper right side of the valve body may be provided with an upward-opening fixing groove. The lower part of the fixing groove is connected to the upper end of the second installation channel. The inner side of the fixing groove, the inner side of the lower part of the exhaust port, and the outer side of the left side of the valve body are all provided with connecting threads.

[0012] The above may also include a power module. The drive mechanism includes a drive motor and a fixed housing. The drive motor is located on the right side of the valve body. The left end of the output shaft of the drive motor is connected to the right end of the valve stem. A fixed housing is fixedly installed on the lower side of the drive motor. The power module is installed inside the fixed housing and is connected to the drive motor.

[0013] This invention features a reasonable and compact structure. In use, the left side of the valve body is installed with the casing. When the casing pressure exceeds a set value, the drive mechanism connects the venting channel and vent port to release air and reduce pressure in the casing. When the casing pressure is within the set range, the drive mechanism disconnects the venting channel and vent port. This design allows for stable control of the casing pressure, ensuring that the casing pressure in different wells meets the set requirements, reducing the impact of gas on the pump power diagram. A reasonable submersion range is set, and control valves allow for opening and closing of the first and second installation channels. When the second installation channel is connected to the venting channel, the casing pressure can be read via a pressure gauge, facilitating control of the drive mechanism. An adjusting valve allows for rapid opening of the first installation channel and venting channel when the drive mechanism operates slowly. This enables on-site control of the casing pressure via the adjusting valves, making operation convenient. Attached Figure Description

[0014] Appendix Figure 1 These are schematic diagrams of the main sectional view of Embodiments 1 to 8.

[0015] Appendix Figure 2 For the appendix Figure 1 A schematic diagram of the front sectional view of the middle valve body.

[0016] Appendix Figure 3 For the appendix Figure 1 A schematic diagram of the cross-sectional structure at point AA.

[0017] Appendix Figure 4 For the appendix Figure 1 Enlarged front view sectional view of the middle valve ball.

[0018] Appendix Figure 5 For the appendix Figure 1 A three-dimensional structural diagram of the middle valve ball.

[0019] The codes in the attached diagram are as follows: 1 for valve body, 2 for valve ball, 3 for valve stem, 4 for vent, 5 for first mounting channel, 6 for second mounting channel, 7 for sealing outer ring platform, 8 for connecting hole, 9 for valve seat, 10 for fixed seat, 11 for seal, 12 for first straight hole section, 13 for tapered hole section, 14 for second straight hole section, 15 for third straight hole section, 16 for first connecting section, 17 for second connecting section, 18 for third connecting section, 19 for control valve core, 20 for control rod, 21 for mounting seat, 22 for mounting groove, 23 for regulating valve, 24 for fixed groove, 25 for power module, 26 for drive motor, and 27 for fixed housing. Detailed Implementation

[0020] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0021] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0022] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0023] Example 1: As shown in the attached document Figures 1 to 5 As shown, the sleeve vent valve includes a valve body 1, a valve ball 2, a valve stem 3, a drive mechanism, a regulating valve 23, and a control valve. The valve body 1 has a through-flow vent channel at the center of its left end. The valve body 1 has an vent port 4 on its right outer side, communicating with the right side of the vent channel. A valve ball 2, which can be rotated to connect and disconnect the vent port 4 from the vent channel, is installed in the vent channel corresponding to the vent port 4. A valve stem 3, with its right end sealed and passing through the vent channel, is fixedly installed on the right outer side of the valve ball 2. A drive mechanism capable of driving the valve stem 3 to rotate is installed on the right side of the valve body 1. A control channel communicating with the left side of the vent channel is located on the upper side of the valve body 1, corresponding to the position to the left of the vent port 4. A first mounting channel 5 and a second mounting channel 6 are spaced apart on the upper left side of the valve body 1. The lower ends of both the first mounting channel 5 and the second mounting channel 6 are connected to the control channel. A regulating valve 23 capable of opening and closing the first mounting channel 5 is located on the outer left side of the valve body 1. A control valve capable of connecting and disconnecting the vent channel from the first mounting channel 5 and the second mounting channel 6 is located on the outer side of the valve body 1 corresponding to the position of the control channel.

[0024] According to requirements, a known pressure gauge is installed on the upper part of the second installation channel 6. During use, the left side of the valve body 1 is installed together with the casing. When the pressure inside the casing exceeds the set value, the exhaust channel and exhaust port 4 are connected by controlling the drive mechanism to vent and reduce the pressure in the casing. When the casing pressure is within the set range, the exhaust channel and exhaust port 4 are disconnected by controlling the drive mechanism to rotate the valve stem 3 and valve ball 2. This configuration allows for stable control of the casing pressure, ensuring that the casing pressure of different wells meets the set requirements, reducing the impact of gas on the pump power diagram, and reasonably setting the submersion range. The first installation channel 5 and the second installation channel 6 can be opened and closed by setting control valves. When the second installation channel 6 is connected to the exhaust channel, the casing pressure can be read by the pressure gauge, facilitating control of the drive mechanism. By setting regulating valve 23, when the drive mechanism operates slowly, the regulating valve 23 can be operated to quickly open the first installation channel 5 and the exhaust channel. This allows for convenient on-site control of the casing pressure by operating the regulating valve 23.

[0025] The above-mentioned casing vent valve can be further optimized and / or improved according to actual needs:

[0026] Example 2: As an optimization of the above examples, as shown in the appendix. Figures 1 to 5 As shown, the exhaust passage includes a first straight hole section 12, a conical hole section 13, a second straight hole section 14, and a third straight hole section 15, which are connected sequentially from left to right and have gradually increasing diameters. The control passage is connected to the first straight hole section 12. The outer left side of the valve ball 2 is in sealing contact with the inner wall of the conical hole section 13. A sealing outer ring platform 7 is fixed to the outer side of the middle part of the valve ball 2. The outer ring surface of the sealing outer ring platform 7 is in sealing contact with the inner wall of the second straight hole section 14. The outer ring surface of the sealing outer ring platform 7 is provided with a connecting hole 8. The other end of the connecting hole 8 extends... The valve stem 2 extends to the outer left side of the valve ball 2 and communicates with the first straight hole section 12. The upper end of the exhaust port 4 is located on the inner wall of the first straight hole section 12 corresponding to the connecting hole 8. The lower end of the exhaust port 4 extends to the lower right side of the valve body 1. A valve seat 9 is rotatably installed on the outer side of the valve stem 3 corresponding to the right side of the valve ball 2. A fixing seat 10 is fixedly installed on the inner right side of the third straight hole section 15 and fitted onto the outer side of the valve stem 3. A sealing element 11 is fitted on the outer side of the valve stem 3 corresponding to the position between the left side of the fixing seat 10 and the right side of the valve seat 9.

[0027] According to requirements, the sealing element 11 is a known packing material. During use, the valve seat 9 and the fixed seat 10 facilitate the installation of the valve stem 3 and the valve ball 2. The connecting hole 8 is provided, with its left end connected to the first straight hole section 12 and its lower end connected to the upper end of the exhaust port 4. When the drive mechanism rotates the valve stem 3 and the valve ball 2, the lower end of the connecting hole 8 is misaligned with the upper end of the exhaust port 4. The inner wall of the second straight hole section 14 can then seal the outer sealing ring 7 of the valve ball 2, thus disconnecting the exhaust port 4 from the connecting hole 8, making control convenient.

[0028] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figures 4 and 5, the diameter of the connecting hole 8, the width of the sealing outer ring platform 7, and the length of the second straight hole section 14 increase sequentially.

[0029] During use, with this setting, when the upper end of the connecting hole 8 and the exhaust port 4 are misaligned after the valve ball 2 rotates, the outer wall of the sealing outer ring platform 7 outside the connecting hole 8 and the inner wall of the second straight hole section 14 are in sealed contact, which can improve the sealing performance of the second straight hole section 14 to the sealing outer ring platform 7 and avoid leakage.

[0030] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2As shown, the diameters of the first mounting channel 5 and the second mounting channel 6 are the same, and the distance between the lower end of the first mounting channel 5 and the upper side of the valve body 1 is the same as the distance between the lower end of the second mounting channel 6 and the upper side of the valve body 1. During use, this arrangement facilitates the control of the first mounting channel 5 and the second mounting channel 6. By adjusting the control valve, the first mounting channel 5, the second mounting channel 6, and the exhaust channel can be simultaneously connected or simultaneously disconnected.

[0031] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown, the control channel includes a first connecting section 16, a second connecting section 17, and a third connecting section 18 connected from top to bottom with gradually decreasing diameters. The lower end of the third connecting section 18 is connected to the first straight hole section 12. The lower ends of the first mounting channel 5 and the second mounting channel 6 are both located on the inner wall of the first connecting section 16. The inner wall of the second connecting section 17 is tapered, wider at the top and narrower at the bottom. The control valve includes a control valve core 19, a control rod 20, and a mounting base 21. The mounting base 21 is sealed and fixedly installed inside the first connecting section 16 at the position above the lower end of the first mounting channel 5. The control rod 20, with its lower end located on the inner side of the lower part of the first connecting section 16, is sealed and screwed to the center of the mounting base 21. The control valve core 19 is fixedly installed at the lower end of the control rod 20 at the position below the lower end of the first mounting channel 5. The outer side of the lower part of the control valve core 19 is in sealed contact with the inner wall of the upper part of the second connecting section 17.

[0032] According to requirements, the cross-sections of the first connecting section 16 and the third connecting section 18 are both circular. The lower part of the control valve core 19 is tapered, wider at the top and narrower at the bottom. The control valve core 19, control rod 20, and mounting base 21 can form a valve core assembly for opening and closing the inlet and outlet within a valve body, as described in existing known technologies. During use, by providing the second connecting section 17, the sealing contact between the control valve core 19 and the inner wall of the second connecting section 17 can be facilitated, improving the opening and closing performance of the second connecting section 17 with the first mounting channel 5 and the second mounting channel 6.

[0033] Example 6: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown, the valve body 1, which is located between the first mounting channel 5 and the mounting base 21, has an upward-opening mounting groove 22 on its outer side. The lower part of the mounting groove 22 is connected to the upper part of the first mounting channel 5, and the regulating valve 23 is installed in the mounting groove 22.

[0034] Depending on the requirements, the regulating valve 23 is based on existing known technology, such as the valve core assembly that opens and closes the inlet and outlet within the valve body, and its structure can be the same as that of the control valve. During use, after the regulating valve 23 is activated, the lower end of the first installation channel 5 can be connected to the outside, facilitating rapid venting and reducing the sleeve pressure.

[0035] Example 7: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown, the upper right side of the valve body 1 is provided with a fixing groove 24 with an upward opening. The lower part of the fixing groove 24 is connected to the upper end of the second installation channel 6. The inner side of the fixing groove 24, the inner side of the lower part of the exhaust port 4, and the outer side of the left side of the valve body 1 are all provided with connecting threads.

[0036] During use, this setup facilitates the disassembly and assembly of the valve body 1 and the sleeve on the left side, allows the installation of a pressure sensor in the fixing groove 24, and enables the installation of an exhaust pipe at the lower end of the exhaust port 4.

[0037] Example 8: As an optimization of the above examples, as shown in the appendix Figure 1 As shown, it also includes a power module 25. The drive mechanism includes a drive motor 26 and a fixed housing 27. The drive motor 26 is located on the right side of the valve body 1. The left end of the output shaft of the drive motor 26 is connected to the right end of the valve stem 3. The fixed housing 27 is fixedly installed on the lower side of the drive motor 26. The power module 25 is installed inside the fixed housing 27 and is connected to the drive motor 26.

[0038] Depending on the requirements, the drive motor 26 is a known technology, such as a 24V electric actuator with a handwheel, the power module 25 is a known lithium battery, and the outer side of the fixed housing 27 is fixed with a known insulation layer to extend the service life of the power module 25. The drive motor 26 can be powered by the power module 25 or by the wellhead thermos cup power supply.

[0039] In use, the outer left side of the valve body 1 is screwed together with the casing thread. A pressure sensor is installed in the fixing groove 24. The pressure sensor is connected to a known control module, and the control module is connected to the drive motor 26. The casing pressure can be controlled between 0.67 and 0.72 MPa, which increases oil and gas production, significantly improving enterprise output value and oilfield production management. Remote automatic adjustment of casing pressure reduces the frequency of manual adjustment and inspection. It can monitor casing pressure at any time and may also help to understand production patterns, reducing the labor intensity of on-site employees.

[0040] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A sleeve venting valve, characterized in that... The valve body includes a valve body, a valve ball, a valve stem, a drive mechanism, a regulating valve, and a control valve. The valve body has a through-flow exhaust channel at the center of its left end. An exhaust port, connected to the right side of the exhaust channel, is located on the outer side of the right side of the valve body. A valve ball, which can be rotated to connect or disconnect the exhaust port from the exhaust channel, is installed in the exhaust channel at the corresponding exhaust port position. A valve stem, with its right end sealed and passing through the exhaust channel, is fixedly installed on the outer side of the right side of the valve ball. A drive mechanism, capable of rotating the valve stem, is installed on the right side of the valve body. A control channel, connected to the left side of the exhaust channel, is located on the upper side of the valve body at the position corresponding to the left of the exhaust port. A first mounting channel and a second mounting channel are spaced apart on the upper left side of the valve body. The lower ends of both the first and second mounting channels are connected to the control channel. A regulating valve, capable of opening and closing the first mounting channel, is located on the outer side of the left side of the valve body. A control valve, capable of connecting or disconnecting the exhaust channel from the first and second mounting channels, is located on the outer side of the valve body at the corresponding control channel position. The exhaust channel includes a first straight hole section, a conical hole section, a second straight hole section, and a third straight hole section that are connected sequentially from left to right and whose diameters gradually increase. The diameter of the first mounting channel is the same as the diameter of the second mounting channel, and the distance between the lower end of the first mounting channel and the upper side of the valve body is the same as the distance between the lower end of the second mounting channel and the upper side of the valve body. The control channel includes a first connecting section, a second connecting section, and a third connecting section that are connected from top to bottom and whose diameters gradually decrease. The lower end of the third connecting section is connected to the first straight hole section. The lower ends of the first and second mounting channels are both located on the inner wall of the first connecting section. The inner wall of the second connecting section is tapered, with a larger upper part and a smaller lower part. The control valve includes a control valve core, a control rod, and a mounting seat. The mounting seat is sealed and fixedly installed in the first connecting section corresponding to the position above the lower end of the first mounting channel. The control rod with its lower end located on the inner side of the lower part of the first connecting section is sealed and screwed to the center of the mounting seat. The control valve core is fixedly installed at the lower end of the control rod corresponding to the position below the lower end of the first mounting channel. The outer side of the lower part of the control valve core is in sealed contact with the inner wall of the upper part of the second connecting section. A pressure gauge is installed at the top of the second installation channel; When the second installation channel is connected to the exhaust channel, the pressure of the sleeve is read by the pressure gauge, which facilitates the control of the drive mechanism. By setting an adjustment valve, when the drive mechanism moves slowly, the adjustment valve can be operated to make the first installation channel and the exhaust channel open quickly.

2. The sleeve vent valve according to claim 1, characterized in that... The control channel is connected to the first straight hole section. The outer left side of the valve ball is in sealing contact with the inner wall of the conical hole section. A sealing outer ring platform is fixed on the outer side of the middle part of the valve ball. The outer ring surface of the sealing outer ring platform is in sealing contact with the inner wall of the second straight hole section. A connecting hole is provided on the outer ring surface of the sealing outer ring platform. The other end of the connecting hole extends to the outer left side of the valve ball and connects with the first straight hole section. The upper end of the exhaust port is located on the inner wall of the first straight hole section corresponding to the connecting hole. The lower end of the exhaust port extends to the lower right side of the valve body. A valve seat is rotatably installed on the outer side of the valve stem corresponding to the right side of the valve ball. A fixed seat is fixedly installed on the inner right side of the third straight hole section and fitted onto the outer side of the valve stem. A sealing element is fitted on the outer side of the valve stem corresponding to the position between the left side of the fixed seat and the right side of the valve seat.

3. The sleeve venting valve according to claim 2, characterized in that... The diameter of the connecting hole, the width of the sealing outer ring platform, and the length of the second straight hole section increase sequentially.

4. The sleeve vent valve according to claim 1, characterized in that... A mounting groove with an upward opening is provided on the outer side of the valve body corresponding to the position between the first mounting channel and the mounting seat. The lower part of the mounting groove is connected to the upper part of the first mounting channel, and the regulating valve is installed in the mounting groove.

5. The sleeve venting valve according to claim 1, 2, 3, or 4, characterized in that... The upper right side of the valve body is provided with an upward-opening fixing groove. The lower part of the fixing groove is connected to the upper end of the second installation channel. The inner side of the fixing groove, the inner side of the lower part of the exhaust port, and the outer side of the left side of the valve body are all provided with connecting threads.

6. The sleeve venting valve according to claim 1, 2, 3, or 4, characterized in that... It also includes a power module. The drive mechanism includes a drive motor and a fixed housing. The drive motor is located on the right side of the valve body. The left end of the output shaft of the drive motor is connected to the right end of the valve stem. A fixed housing is fixedly installed on the lower side of the drive motor. The power module is installed inside the fixed housing and is connected to the drive motor.

Images