Sleeve deflation valve

Abstract

The invention relates to the technical field of oil field production well casing pressure control, in particular to a casing deflation valve which comprises a valve body, a valve ball, a valve rod, a driving mechanism, an adjusting valve and a control valve, a left-right through exhaust channel is formed in the center of the left end of the valve body, and an exhaust port communicated with the right portion of the exhaust channel is formed in the outer side of the right portion of the valve body. The structure is reasonable and compact, during use, the left side of the valve body and the sleeve are installed together, when the pressure in the sleeve is higher than a set value, the driving mechanism is controlled to enable the exhaust channel to communicate with the exhaust port, exhaust and pressure reduction are conducted on the sleeve, and when the pressure of the sleeve is within a set interval, the driving mechanism is controlled to enable the exhaust channel to communicate with the exhaust port. By means of the arrangement, the pressure of the casing pipe can be stably controlled, the pressure of the casing pipe of different oil wells can meet the set requirement, the influence of gas on a pump indicator diagram is reduced, and the submergence degree interval is reasonably set.

Description

Technical Field

[0001] The invention relates to the technical field of casing pressure control of oil field production wells, and is a casing air release valve. Background Art

[0002] Casing pressure is one of the important parameters in oil well production. Its changes and fluctuations will directly affect the submergence of the oil well, crude oil production, pump efficiency and wax deposition. During the production process of the oil well, when the bottom hole pressure is lower than the saturation pressure, natural gas will be separated from the crude oil. A part of the separated natural gas will accumulate in the annular space of the oil casing to form casing pressure. The casing pressure is too high, forcing the dynamic liquid level to drop. When the dynamic liquid level drops to the suction port of the deep well pump, the gas will flow into the deep well pump, reducing the pump efficiency and stopping the oil well. In severe cases, gas lock will occur. At present, the traditional method of mechanical manual adjustment is used on site to control the casing pressure, or the hand wheel and top screw are used to apply different pressures to the spring to achieve different set pressures for the valve opening. However, there are still technical bottlenecks such as inconvenient adjustment, valve stagnation and inability to monitor in real time. Summary of the invention

[0003] The present invention provides a casing bleed valve, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problems of inconvenient adjustment and valve stagnation in the conventional casing pressure control method.

[0004] The technical scheme of the present invention is achieved through the following measures: a sleeve vent valve, comprising a valve body, a valve ball, a valve stem, a driving mechanism, a regulating valve and a control valve, an exhaust passage running left and right is provided in the center of the left end of the valve body, an exhaust port communicating with the right part of the exhaust passage is provided on the outer side of the right part of the valve body, a valve ball which can connect and disconnect the exhaust port with the exhaust passage after rotation is installed in the exhaust passage corresponding to the position of the exhaust port, a valve stem with a right end sealingly passing through the exhaust passage is fixedly installed on the outer side of the right part of the valve ball, a driving mechanism which can drive the valve stem to rotate is installed on the right side of the valve body, a control passage communicating with the left part of the exhaust passage is provided on the upper side of the valve body corresponding to the left position of the exhaust port, a first installation passage and a second installation passage are provided at intervals on the upper side of the left part of the valve body, the lower end of the first installation passage and the lower end of the second installation passage are both communicated with the control passage, a regulating valve which can open and close the first installation passage is provided on the outer side of the left part of the valve body, and a control valve which can connect and disconnect the exhaust passage with the first installation passage and the second installation passage is provided on the outer side of the valve body corresponding to the position of the control passage.

[0005] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned exhaust passage may include a first straight hole section, a tapered hole section, a second straight hole section and a third straight hole section which are connected in sequence from left to right and whose diameters gradually increase. 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 tapered hole section. A sealing outer ring platform is fixed to 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 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 side of the right part 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 which is sleeved 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 member is provided on the outer side sealing sleeve of the valve stem corresponding to the position between the left side of the fixing seat and the right side of the valve seat.

[0006] The diameter of the connecting hole, the width of the sealing outer ring platform and the length of the second straight hole section increase in sequence.

[0007] The diameter of the first installation channel and the diameter of the second installation channel may be the same, and the distance between the lower end of the first installation channel and the upper side of the valve body and the distance between the lower end of the second installation channel and the upper side of the valve body are the same.

[0008] The above-mentioned control channel may include a first connecting section, a second connecting section and a third connecting section which are connected in sequence 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 installation channel and the second installation channel 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 installation channel. The control rod with the lower end located on the inner side of the lower part of the first connecting section is threadedly connected to the center of the mounting seat. The control valve core is fixedly installed on the lower end of the first control rod corresponding to the position below the lower end of the first installation channel. The outer side of the lower part of the control valve core is in sealing contact with the inner wall of the upper part of the second connecting section.

[0009] An installation groove opening upward may be provided on the outer side of the valve body corresponding to the position between the first installation channel and the installation seat, the lower part of the installation groove is communicated with the upper part of the first installation channel, and the regulating valve is installed in the installation groove.

[0010] A fixing groove opening upward may be provided on the upper right side of the valve body, the lower part of the fixing groove is connected to the upper end of the second installation channel, and connecting threads are provided on 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 part of the valve body.

[0011] The above may also include a power supply module, the driving mechanism includes a driving motor and a fixed shell, a driving motor is provided on the right side of the valve body, the left end of the output shaft of the driving motor and the right end of the valve stem are transmission-connected together, a fixed shell is fixedly installed on the lower side of the driving motor, a power supply module is installed in the fixed shell, and the power supply module is connected to the driving motor.

[0012] The structure of the present invention is reasonable and compact. 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 channel and the exhaust port can be connected by controlling the driving mechanism, and the casing is exhausted and depressurized. When the casing pressure is within the set interval, the exhaust channel and the exhaust port can be disconnected by controlling the driving mechanism. Through such an arrangement, the casing pressure can be stably controlled, so that the casing pressure of different oil wells meets the set requirements, the influence of gas on the pump power diagram is reduced, and the sinking degree interval is reasonably set. By setting the control valve, the first installation channel and the second installation channel can be opened and closed. When the second installation channel is connected with the exhaust channel, the casing pressure can be read by the pressure gauge, so as to facilitate the control of the driving mechanism. By setting the regulating valve, the regulating valve can be operated when the driving mechanism moves slowly, so that the first installation channel and the exhaust channel are quickly opened. In this way, the casing pressure can be controlled on site by operating the regulating valve, and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a schematic diagram of the front cross-sectional structure of Embodiments 1 to 8.

[0014] Attached Figure 2 For attachment Figure 1 Schematic diagram of the main cross-sectional structure of the middle valve body.

[0015] Attached Figure 3 For attachment Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle.

[0016] Attached Figure 4 For attachment Figure 1 Schematic diagram of the main cross-sectional enlarged structure of the middle valve ball.

[0017] Attached Figure 5 For attachment Figure 1 Schematic diagram of the three-dimensional structure of the middle valve ball.

[0018] The codes in the accompanying drawings are: 1 is the valve body, 2 is the valve ball, 3 is the valve stem, 4 is the exhaust port, 5 is the first installation channel, 6 is the second installation channel, 7 is the sealing outer ring platform, 8 is the connecting hole, 9 is the valve seat, 10 is the fixed seat, 11 is the sealing member, 12 is the first straight hole section, 13 is the tapered hole section, 14 is the second straight hole section, 15 is the third straight hole section, 16 is the first connecting section, 17 is the second connecting section, 18 is the third connecting section, 19 is the control valve core, 20 is the control rod, 21 is the mounting seat, 22 is the mounting groove, 23 is the regulating valve, 24 is the fixed groove, 25 is the power module, 26 is the drive motor, and 27 is the fixed housing. DETAILED DESCRIPTION

[0019] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0020] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0021] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As shown in the attached Figures 1 to 5 As shown, the sleeve vent valve includes a valve body 1, a valve ball 2, a valve stem 3, a driving mechanism, a regulating valve 23 and a control valve. An exhaust passage that passes through the left and right sides is provided in the center of the left end of the valve body 1. An exhaust port 4 that is connected to the right side of the exhaust passage is provided on the outer side of the right part of the valve body 1. A valve ball 2 that can connect and disconnect the exhaust port 4 with the exhaust passage after rotation is installed in the exhaust passage corresponding to the position of the exhaust port 4. A valve stem 3 that seals and passes through the exhaust passage at the right end is fixedly installed on the outer side of the right part of the valve ball 2. A driving mechanism that can drive the valve stem 3 to rotate is installed on the right side of the valve body 1. A control passage that is connected to the left side of the exhaust passage is provided on the upper side of the valve body 1 corresponding to the left side of the exhaust port 4. A first installation channel 5 and a second installation channel 6 are provided at intervals on the upper side of the left part of the valve body 1. The lower end of the first installation channel 5 and the lower end of the second installation channel 6 are both connected to the control passage. A regulating valve 23 that can open and close the first installation channel 5 is provided on the outer side of the left part of the valve body 1. A control valve that can connect and disconnect the exhaust passage with the first installation channel 5 and the second installation channel 6 is provided on the outer side of the valve body 1 corresponding to the position of the control passage.

[0022] According to the requirements, a known pressure gauge is installed on the upper part of the second installation channel 6. When in use, the left side of the valve body 1 is installed together with the casing. When the pressure in the casing is higher than the set value, the exhaust channel and the exhaust port 4 can be connected by controlling the driving mechanism, and the casing is exhausted and depressurized. When the casing pressure is within the set range, the exhaust channel and the exhaust port 4 are disconnected after the valve stem 3 and the valve ball 2 are rotated by controlling the driving mechanism. Through such a setting, the casing pressure can be stably controlled, so that the casing pressure of different oil wells can meet the set requirements, reduce the influence of gas on the pump power diagram, and reasonably set the submergence range. By setting the control valve, the first installation channel 5 and the second installation channel 6 can be opened and closed. When the second installation channel 6 is connected with the exhaust channel, the casing pressure can be read through the pressure gauge, so as to facilitate the control of the driving mechanism. By setting the regulating valve 23, when the driving mechanism moves slowly, the regulating valve 23 can be operated to make the first installation channel 5 and the exhaust channel open quickly. In this way, the casing pressure can be controlled on site by operating the regulating valve 23, which is convenient to operate.

[0023] The above casing bleed valve can be further optimized and / or improved according to actual needs: Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figures 1 to 5 As shown, the exhaust passage includes a first straight hole section 12, a tapered hole section 13, a second straight hole section 14 and a third straight hole section 15 which are connected in sequence from left to right and whose diameters gradually increase. The control passage is connected to the first straight hole section 12. The outer side of the left portion of the valve ball 2 is in sealing contact with the inner wall of the tapered hole section 13. A sealing outer ring platform 7 is fixed to the outer side of the middle portion 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. A connecting hole 8 is provided on the outer ring surface of the sealing outer ring platform 7. The other end of the connecting hole 8 extends It extends to the outer side of the left part of the valve ball 2 and is connected 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 sleeved on the outer side of the valve stem 3 is fixedly installed on the inner side of the right part of the third straight hole section 15. A sealing sleeve 11 is installed 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.

[0024] According to the requirements, the sealing member 11 is a known packing. During use, the valve seat 9 and the fixed seat 10 are provided to facilitate the installation of the valve stem 3 and the valve ball 2. By providing the connecting hole 8, the left end of the connecting hole 8 is connected to the first straight hole section 12, and the lower end of the connecting hole 8 is connected to the upper end of the exhaust port 4. When the driving mechanism drives the valve stem 3 and the valve ball 2 to rotate, the lower end of the connecting hole 8 is misaligned with the upper end of the exhaust port 4, and the inner wall of the second straight hole section 14 can seal the sealing outer ring 7 of the valve ball 2, so that the exhaust port 4 and the connecting hole 8 are disconnected, and the control is convenient.

[0025] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown in FIGS. 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 successively.

[0026] During use, through such an arrangement, when the connecting hole 8 and the upper end of 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 sealing contact, which can improve the sealing performance of the second straight hole section 14 to the sealing outer ring platform 7 and avoid leakage.

[0027] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2As shown, the diameter of the first installation channel 5 is the same as the diameter of the second installation channel 6, and the distance between the lower end of the first installation channel 5 and the upper side of the valve body 1 is the same as the distance between the lower end of the second installation channel 6 and the upper side of the valve body 1. During use, such an arrangement facilitates the control of the first installation channel 5 and the second installation channel 6, and by adjusting the control valve, the first installation channel 5, the second installation channel 6 and the exhaust channel can be connected or disconnected at the same time.

[0028] Embodiment 5: As an optimization of the above embodiment, as shown in the attached 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 which are connected in sequence from top to bottom and whose diameters gradually decrease. The lower end of the third connecting section 18 is connected to the first straight hole section 12. The lower ends of the first installation channel 5 and the second installation 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 in a tapered shape with a larger upper portion and a smaller lower portion. The control valve includes a control valve core 19, a control rod 20 and a mounting seat 21. The mounting seat 21 is sealed and fixedly installed in the first connecting section 16 corresponding to the upper position of the lower end of the first installation channel 5. The control rod 20 with the lower end located on the inner side of the lower part of the first connecting section 16 is sealed and screwed in the center of the mounting seat 21. The control valve core 19 is fixedly installed on the lower end of the first control rod 20 corresponding to the lower position of the first installation channel 5. The outer side of the lower part of the control valve core 19 is in sealing contact with the upper inner wall of the second connecting section 17.

[0029] According to the 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 with a larger upper portion and a smaller lower portion, and the control valve core 19, the control rod 20 and the mounting seat 21 can form a valve core assembly of the existing known technology, such as the valve core assembly for opening and closing the inlet and outlet of the valve body. During use, by providing the second connecting section 17, it is possible to facilitate the sealing contact between the control valve core 19 and the inner wall of the second connecting section 17, thereby improving the opening and closing performance of the second connecting section 17 and the first installation channel 5 and the second installation channel 6.

[0030] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown, a mounting groove 22 opening upward is provided on the outer side of the valve body 1 corresponding to the position between the first mounting channel 5 and the mounting seat 21 , 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 .

[0031] According to the requirements, the regulating valve 23 is a known technology, such as a valve core assembly for opening and closing the inlet and outlet in the valve body, and the structure can also be the same as the structure of the control valve. During use, after the regulating valve 23 is actuated, the lower end of the first installation channel 5 can be connected to the outside world, which is convenient for rapid exhaust and reduces the casing pressure.

[0032] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown, a fixing groove 24 opening upward is provided on the upper right side of the valve body 1, and the lower part of the fixing groove 24 is connected to the upper end of the second installation channel 6, and 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 part of the valve body 1 are all provided with connecting threads.

[0033] During use, such an arrangement facilitates assembly and disassembly between the left side of the valve body 1 and the sleeve, and a pressure sensor can be installed in the fixing groove 24 , and an exhaust pipe can be installed at the lower end of the exhaust port 4 .

[0034] Embodiment 8: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, it also includes a power module 25, and the driving mechanism includes a driving motor 26 and a fixed shell 28. The driving motor 26 is provided on the right side of the valve body 1, and the left end of the output shaft of the driving motor 26 and the right end of the valve stem 3 are transmission-connected together. The fixed shell 28 is fixedly installed on the lower side of the driving motor 26, and the power module 25 is installed in the fixed shell 28, and the power module 25 is connected to the driving motor 26.

[0035] According to the needs, the drive motor 26 is an existing well-known technology, such as a 24V electric actuator with a handwheel, the power module 25 is an existing well-known lithium battery, and an existing well-known insulation layer is fixed to the outside of the fixed shell 28 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.

[0036] When in use, the outer side of the left part of the valve body 1 and the casing thread are screwed together, a pressure sensor is installed in the fixing groove 24, the pressure sensor is connected to the existing well-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, so that the oil production and gas production can be increased, which can significantly improve the output value of the enterprise, and can also improve the level of oil field production management. The casing pressure can be adjusted remotely and automatically, and the frequency of manual adjustment and inspection can be reduced. The casing pressure can be mastered at any time, and the production rules can be mastered, thereby reducing the labor intensity of on-site employees.

[0037] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A casing vent valve, characterized in that The vent valve of the embodiment of the present invention is provided with a plurality of control valves, and a plurality of control valves are provided on the vent valve body, and a plurality of control valves are provided on the vent valve body.

2. The casing vent valve according to claim 1, characterized in that The exhaust passage includes a first straight hole section, a tapered hole section, a second straight hole section and a third straight hole section which are connected in sequence from left to right and whose diameters gradually increase. 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 tapered hole section. A sealing outer ring platform is fixed to 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 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, and the lower end of the exhaust port extends to the lower side of the right part 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 sleeved 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 member is provided on the outer side sealing sleeve of the valve stem corresponding to the position between the left side of the fixing seat and the right side of the valve seat.

3. The casing vent 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 in sequence.

4. The casing vent valve according to claim 1, 2 or 3, characterized in that The diameter of the first installation channel is the same as that of the second installation channel, and the distance between the lower end of the first installation channel and the upper side of the valve body is the same as that between the lower end of the second installation channel and the upper side of the valve body.

5. The casing vent valve according to claim 4, characterized in that The control channel includes a first connecting section, a second connecting section and a third connecting section which are connected in sequence 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 installation channel and the second installation channel 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 portion and a smaller lower portion. 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 installation channel. The control rod with the lower end located on the inner side of the lower part of the first connecting section is sealed and screwed in the center of the mounting seat. The control valve core is fixedly installed on the lower end of the first control rod corresponding to the position below the lower end of the first installation channel. The outer side of the lower part of the control valve core is in sealing contact with the inner wall of the upper part of the second connecting section.

6. The casing vent valve according to claim 5, characterized in that An upwardly opening mounting groove 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 communicated with the upper part of the first mounting channel, and the regulating valve is installed in the mounting groove.

7. The casing vent valve according to claim 1 or 2 or 3 or 5 or 6, characterized in that A fixing groove opening upward is provided on the upper right side of the valve body, the lower part of the fixing groove is connected to the upper end of the second installation channel, and connecting threads are provided on 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 part of the valve body.

8. The casing vent valve according to claim 4, characterized in that A fixing groove opening upward is provided on the upper right side of the valve body, the lower part of the fixing groove is connected to the upper end of the second installation channel, and connecting threads are provided on 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 part of the valve body.

9. The casing vent valve according to claim 1 or 2 or 3 or 5 or 6 or 8, characterized in that It also includes a power module, and the driving mechanism includes a driving motor and a fixed shell. The driving motor is arranged on the right side of the valve body, and the left end of the output shaft of the driving motor and the right end of the valve stem are connected together by transmission. A fixed shell is fixedly installed on the lower side of the driving motor, and a power module is installed in the fixed shell. The power module is connected to the driving motor.

10. The casing vent valve according to claim 4, characterized in that It also includes a power module, and the driving mechanism includes a driving motor and a fixed shell. The driving motor is arranged on the right side of the valve body, and the left end of the output shaft of the driving motor and the right end of the valve stem are connected together by transmission. A fixed shell is fixedly installed on the lower side of the driving motor, and a power module is installed in the fixed shell. The power module is connected to the driving motor.

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