Heavy oil wellhead casing pressure stabilization and sealing release device and method

Abstract

This invention relates to the field of well equipment technology, and is a pressure-regulating and sealing release device and method for the casing pressure of a heavy oil well. The former includes a flow guide tee, a bolt plunger, a plunger rod, a regulating valve assembly and a rod sealing assembly. The flow guide tee is provided with a transverse valve chamber that runs through the left and right sides. The transverse valve chamber includes a limiting section, a threaded section and a sealing section that are connected from left to right and whose inner diameters increase sequentially. The latter has the following steps: (1) Assemble the regulating valve assembly: Install the assembled regulating valve assembly into the mounting cavity provided on the bolt plunger. The outer side of the valve seat is fixedly installed in the fixing ring groove provided in the mounting cavity by a threaded connection. The invention has a reasonable and compact structure and ingenious design. By setting the regulating valve assembly, it can open and release pressure when the pressure in the vertical valve chamber is greater than the pressure in the limiting section. The preload of the reset spring is adjusted by the depth of the valve seat screwed into the fixing ring groove, thereby realizing the pressure-regulating opening of the valve plate. It has the characteristics of being fast, stable and efficient.

Description

Technical Field

[0001] This invention relates to the field of well equipment technology, and is a device and method for releasing pressure at the wellhead casing of heavy oil wells. Background Technology

[0002] In heavy oil production, thermal recovery is commonly employed, resulting in large volumes of associated gas. This increases casing pressure, forcing a drop in the dynamic fluid level of the well, leading to a decrease in the effective production pressure differential and overall production capacity. Simultaneously, some associated gas enters the pump chamber with the liquid flow, causing a delay in the opening of the suction valve, and in severe cases, gas lock, further reducing pump efficiency. The casing pressure directly affects the dynamic fluid level, submersion, and production pressure differential. For wells with high gas production and high casing pressure, lower casing pressure generally results in higher production and submersion, and vice versa. In field production, casing gas poses significant challenges to heavy oil well management. The continuous accumulation of casing gas in the annular space leads to a continuous increase in casing pressure, causing a drop in the dynamic fluid level, resulting in insufficient fluid supply, and in severe cases, gas lock, ultimately preventing the well from producing any oil and disrupting normal pump operation.

[0003] Currently, the conventional method for addressing the aforementioned problems is to manually open the casing gate valve daily at the wellhead to release pressure. This method is labor-intensive, generates significant noise during the depressurization process, and releases toxic and harmful gases, potentially causing localized concentrations to exceed standards. Furthermore, with the increasing demands for green oilfield construction and strengthened VOCs control, casing pressure release from heavy oil wells is no longer permitted at the wellhead. Therefore, it is crucial to research a safe, environmentally friendly, and efficient casing pressure release method to reduce the impact of casing gas on oil well production, while simultaneously mitigating the environmental impact of existing casing pressure release methods. This requires addressing the root causes of VOCs generation by improving the process to reduce VOC emissions. Summary of the Invention

[0004] This invention provides a device and method for sealing and releasing casing pressure at the wellhead of heavy oil wells, which overcomes the shortcomings of the prior art and can effectively solve the problems of time-consuming, labor-intensive, and environmentally polluting casing depressurization in existing wellhead systems.

[0005] One of the technical solutions of this invention is achieved through the following measures: a pressure-regulating and sealing release device for the casing of a heavy oil well, comprising a flow guide tee, a bolt plunger, a plunger rod, a regulating valve assembly, and a rod sealing assembly. The flow guide tee is provided with a transverse valve chamber that runs through the left and right sides. The transverse valve chamber includes a limiting section, a threaded section, and a sealing section that are connected sequentially from left to right and whose inner diameters increase sequentially. A vertical valve chamber with its upper end connected to the transverse valve chamber is provided on the lower left side of the flow guide tee corresponding to the left position of the threaded section. A bolt plunger is fixedly installed on the inner side of the left end of the threaded section by a threaded connection. A plunger rod with its right end located to the right of the flow guide tee is provided in the sealing section. The left end of the plunger rod is fixedly installed together with the center of the right side of the bolt plunger. A rod sealing assembly is provided between the flow guide tee and the plunger rod corresponding to the sealing section. The bolt plunger is provided with an installation cavity that opens to the left. A connecting hole that can communicate with the installation cavity is provided on the outer side of the bolt plunger corresponding to the vertical valve chamber. A regulating valve assembly that can be opened when the pressure in the vertical valve chamber is greater than the pressure in the limiting section is provided in the installation cavity.

[0006] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions:

[0007] The aforementioned regulating valve assembly may include a valve seat, a mounting ring, connecting ribs, a valve stem, a valve plate, and a return spring. A fixing ring groove is provided on the inner side of the left end of the mounting cavity corresponding to the left position of the connecting hole. A valve seat is fixedly installed on the inner side of the left end of the fixing ring groove. A mounting ring is provided inside the valve seat. At least two connecting ribs are fixedly installed circumferentially between the outer side of the mounting ring and the inner side of the valve seat. A valve stem is provided inside the mounting ring. A limiting ring platform located to the left of the mounting ring is provided on the outer side of the left end of the valve stem. A valve plate capable of sealing the mounting cavity is fixedly installed on the right end of the valve stem. The right side of the valve plate abuts against the right side of the fixing ring groove. A return spring is provided on the outer side of the valve stem corresponding to the position between the mounting ring and the valve plate.

[0008] The aforementioned regulating valve assembly may also include an anchor rod, with at least one connecting rib having a mounting hole, and an anchor rod with its right end limited and installed at the corresponding position inside the fixing ring groove is fixedly installed in the mounting hole.

[0009] The aforementioned rod sealing assembly may include a gasket, a packing assembly, a gland, and a cap. The sealing section is provided with a gasket, a packing assembly, a gland, and a cap located on the outside of the plunger rod from left to right. The right end of the gland is located to the right of the flow guide tee, and the left end of the cap is fixedly installed on the outside of the right end of the flow guide tee.

[0010] The above may also include an external pipe and a test instrument. The upper left side of the flow guide tee corresponding to the vertical valve chamber position is provided with a test hole that communicates with the horizontal valve chamber at its lower end. The upper left side of the flow tee corresponding to the test hole position is fixedly installed with an external pipe, and a test instrument is installed on the external pipe.

[0011] The above may also include a handwheel, with a handwheel fixedly installed on the outer side of the right end of the plunger rod.

[0012] The aforementioned bolt plunger may have three connecting holes evenly distributed around its circumference on its outer side.

[0013] The second technical solution of the present invention is achieved through the following measures: a method for using the above-mentioned heavy oil wellhead casing pressure regulating and sealing release device, comprising the following steps:

[0014] (1) Assemble the regulating valve assembly: Install the assembled regulating valve assembly into the mounting cavity set on the bolt plunger. The outer side of the valve seat is fixedly installed in the fixing ring groove set in the mounting cavity by threaded connection. The preload of the reset spring is adjusted by the screwing depth of the valve seat to realize the constant pressure opening of the valve plate. The anchor rod is used to prevent the valve seat from disengaging and causing the constant pressure to fail.

[0015] (2) Assemble the bolt plunger: Install the integrated bolt plunger and plunger rod into the transverse valve chamber on the flow guide tee, and install the bolt plunger into the threaded section by rotating the plunger rod through a threaded connection.

[0016] (3) Assemble the rod sealing assembly: Install the gasket, packing assembly, gland and cap from left to right on the outside of the plunger rod, so that the left side of the gasket abuts against the right side of the threaded section, and tighten the cap to fix it on the outside of the right end of the guide tee;

[0017] (4) Installation to the wellhead production tree: The left end of the guide tee is connected to the auxiliary production valve through a pipeline, and the lower end of the guide tee is connected to the auxiliary casing valve through a pipeline;

[0018] (5) Pressure relief: By rotating the plunger rod, the left end of the bolt plunger is pressed against the right side of the limit section. When the casing pressure is too high, the high pressure gas in the casing pushes open the valve plate, causing the valve plate to move to the left. Thus, the high pressure gas in the casing passes through the auxiliary casing valve, the lower end of the guide tee, the left end of the guide tee, and the auxiliary production valve in sequence and enters the single well production process.

[0019] (6) Bidirectional flow: By rotating the plunger rod, the left end of the bolt plunger is located on the right side of the vertical valve chamber, connecting the left part of the flow guide tee with the lower part of the flow guide tee, so that the fluid in the single well production process passes through the auxiliary production valve, the left end of the flow guide tee, the lower end of the flow guide tee and the auxiliary casing valve in sequence and enters the oil casing annulus.

[0020] This invention features a reasonable and compact structure with ingenious design. By incorporating a regulating valve assembly, it can open and release pressure when the pressure in the vertical valve chamber exceeds the pressure in the limiting section. The preload of the reset spring is adjusted by the depth of the valve seat's insertion into the fixing ring groove, thereby achieving constant pressure opening of the valve plate. An anchor rod is used to prevent the valve seat from detaching from the bolt plunger. A rod sealing assembly is used to prevent liquid or gas leakage from the right end of the guide tee. It is characterized by its speed, stability, and high efficiency. Attached Figure Description

[0021] Appendix Figure 1These are schematic diagrams of the main cross-sectional structure of embodiments 1 to 7 of the present invention.

[0022] Appendix Figure 2 For the appendix Figure 1 A schematic diagram of the three-dimensional structure.

[0023] Appendix Figure 3 For the appendix Figure 1 A three-dimensional structural diagram of the central bolt plunger.

[0024] Appendix Figure 4 This is a schematic diagram of the main structure of Embodiment 8 of the present invention.

[0025] The codes in the attached diagram are as follows: 1 is the guide tee, 2 is the bolt plunger, 3 is the plunger rod, 4 is the limiting section, 5 is the threaded section, 6 is the external connecting pipe, 7 is the vertical valve chamber, 8 is the valve seat, 9 is the mounting ring, 10 is the connecting rib, 11 is the valve stem, 12 is the valve plate, 13 is the return spring, 14 is the mounting cavity, 15 is the connecting hole, 16 is the fixing ring groove, 17 is the testing instrument, 18 is the anchor rod, 19 is the gasket, 20 is the packing assembly, 21 is the gland, 22 is the pressure cap, 23 is the handwheel, 24 is the wellhead production tree, 25 is the auxiliary production valve connection, and 26 is the auxiliary casing valve. Detailed Implementation

[0026] The present invention is not limited to the following embodiments, and specific implementation methods can be determined according to the technical solutions and actual conditions of the present invention.

[0027] 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 the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0028] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0029] Example 1: As shown in the attached document Figures 1 to 4As shown, the heavy oil wellhead casing pressure regulating and sealing release device includes a flow guide tee 1, a bolt plunger 2, a plunger rod 3, a regulating valve assembly, and a rod sealing assembly. The flow guide tee 1 has a transverse valve chamber that runs through both sides. The transverse valve chamber includes a limiting section 4, a threaded section 5, and a sealing section that are connected sequentially from left to right and have progressively increasing inner diameters. A vertical valve chamber 7 is located on the lower left side of the flow guide tee 1, corresponding to the left position of the threaded section 5, and its upper end is connected to the transverse valve chamber. The bolt plunger 2 is fixedly installed on the inner side of the left end of the threaded section 5 by a threaded connection. The sealing section has a plunger rod 3 located to the right of the flow guide tee 1. The left end of the plunger rod 3 is fixedly installed together with the center of the right side of the bolt plunger 2. A rod sealing assembly is provided between the flow guide tee 1 and the plunger rod 3 at the corresponding sealing section position. The bolt plunger 2 has an installation cavity 14 with an opening to the left. The bolt plunger 2 at the corresponding vertical valve cavity 7 has a connecting hole 15 on its outer side that can communicate with the installation cavity 14. The installation cavity 14 has a regulating valve assembly that can be opened when the pressure in the vertical valve cavity 7 is greater than the pressure in the limit section 4. During use, the invention is installed at the wellhead tree 24, with the left end of the guide tee 1 connected to the auxiliary production valve 25 via a pipeline, and the lower end of the guide tee 1 connected to the auxiliary casing valve 26 via a pipeline. When pressure stabilization and depressurization are required, rotating the plunger rod 3 causes the left end of the bolt plunger 2 to abut against the right side of the limit section 4. This allows the high-pressure gas inside the casing to open the regulating valve assembly when the casing pressure is too high. The high-pressure gas then sequentially passes through the auxiliary casing valve 26, the lower end of the guide tee 1, the left end of the guide tee 1, and the auxiliary production valve before entering the single-well production process, effectively avoiding manual opening. The auxiliary casing valve 26 on the gas production tree depressurizes the casing and prevents toxic and harmful gases from being directly discharged into the air from the auxiliary casing valve 26. When bidirectional flow is required, rotating the plunger rod 3 positions the left end of the bolt plunger 2 to the right of the vertical valve chamber 7, connecting the left and lower parts of the guide tee 1. This allows the fluid in the single-well production process to sequentially pass through the auxiliary production valve, the left end of the guide tee 1, the lower end of the guide tee 1, and the auxiliary casing valve 26 into the annulus. By setting a regulating valve assembly, depressurization can be opened when the pressure in the vertical valve chamber 7 exceeds the pressure in the limit section 4. Depending on the requirements, the regulating valve assembly can be a known one-way valve, which can meet the constant pressure opening and closing under the action of spring restoring force.

[0030] The above-mentioned heavy oil wellhead casing pressure regulating and sealing release device can be further optimized and / or improved according to actual needs:

[0031] Example 2: As shown in the attached document Figures 1 to 3As shown, the regulating valve assembly includes a valve seat 8, a mounting ring 9, a connecting rib 10, a valve stem 11, a valve plate 12, and a return spring 13. A fixing ring groove 16 is provided on the inner side of the left end of the mounting cavity 14 corresponding to the left position of the connecting hole 15. The valve seat 8 is fixedly installed on the inner side of the left end of the fixing ring groove 16. The valve seat 8 is provided with a mounting ring 9. At least two connecting ribs 10 are fixedly installed circumferentially between the outer side of the mounting ring 9 and the inner side of the valve seat 8. The valve stem 11 is provided in the mounting ring 9. A limiting ring platform located to the left of the mounting ring 9 is provided on the outer side of the left end of the valve stem 11. A valve plate 12 capable of sealing the mounting cavity 14 is fixedly installed on the right end of the valve stem 11. The right side of the valve plate 12 abuts against the right side of the fixing ring groove 16. A return spring 13 is provided on the outer side of the valve stem 11 corresponding to the position between the mounting ring 9 and the valve plate 12. During use, when the casing pressure is too high, the high-pressure gas inside the casing pushes open the valve plate 12, causing the valve plate 12 to move to the left. Thus, the high-pressure gas inside the casing passes through the lower end of the guide tee 1 and the left end of the guide tee 1 in sequence and enters the single-well production process. The preload of the reset spring 13 is adjusted by the depth of the valve seat 8 screwed into the fixed ring groove 16, thereby realizing the constant pressure opening of the valve plate 12.

[0032] Example 3: As shown in the attached document Figures 1 to 3 As shown, the regulating valve assembly also includes an anchor rod 18. At least one connecting rib 10 has a mounting hole, and an anchor rod 18 with its right end fixedly mounted at a corresponding position inside the fixing ring groove 16 is fixedly installed in the mounting hole. During use, by setting the anchor rod 18, the valve seat 8 is prevented from detaching from the bolt plunger 2, thus preventing the pressure setting from failing. In addition, the anchor rod 18 can be L-shaped, with its end engaging with the threads provided inside the fixing ring groove 16, thereby limiting and preventing loosening of the valve seat 8.

[0033] Example 4: As shown in the appendix Figures 1 to 3 As shown, the rod sealing assembly includes a gasket 19, a packing assembly 20, a gland 21, and a cap 22. Within the sealing section, from left to right, the gasket 19, packing assembly 20, gland 21, and cap 22 are sequentially located outside the plunger rod 3. The right end of the gland 21 is located to the right of the flow guide tee 1, and the left end of the cap 22 is fixedly installed on the outer side of the right end of the flow guide tee 1. This arrangement prevents liquid or gas leakage from the right end of the flow guide tee 1 during use.

[0034] Example 5: As shown in the attached document Figures 1 to 4 As shown, it also includes an external pipe 6 and a testing instrument 17. A test hole is provided on the upper left side of the flow guide tee 1 corresponding to the position of the vertical valve chamber 7, with its lower end communicating with the horizontal valve chamber. An external pipe 6 is fixedly installed on the upper left side of the flow guide tee corresponding to the test hole position, and the testing instrument 17 is mounted on the external pipe 6. During use, the testing instrument 17 facilitates the detection of parameters such as pressure within the flow guide tee 1. Depending on the requirements, the testing instrument 17 can be a pressure gauge.

[0035] Example 6: As shown in the appendix Figures 1 to 3As shown, it also includes a handwheel 23, which is fixedly installed on the outer side of the right end of the plunger rod 3. During use, this arrangement facilitates the rotation of the plunger rod 3 via the handwheel 23.

[0036] Example 7: As attached Figures 1 to 3 As shown, the bolt plunger 2 has three connecting holes 15 evenly distributed around its outer circumference. During use, the bolt plunger 2 is inserted into the threaded section 5 by rotating it through a threaded connection, thus providing three connecting holes 15 to facilitate communication between the transverse valve chamber and the vertical valve chamber 7.

[0037] Example 8: As attached Figures 1 to 4 As shown, a method for using the above-mentioned heavy oil wellhead casing pressure regulating and sealing release device includes the following steps:

[0038] (1) Assemble the regulating valve assembly: Install the assembled regulating valve assembly into the mounting cavity 14 provided on the bolt plunger 2. The outer side of the valve seat 8 is fixedly installed in the fixing ring groove 16 provided in the mounting cavity 14 by thread connection. The preload of the reset spring 13 is adjusted by the screwing depth of the valve seat 8 to realize the constant pressure opening of the valve plate 12. The anchor rod 18 prevents the valve seat 8 from disengaging and causing the constant pressure to fail.

[0039] (2) Assemble the bolt plunger 2: Install the bolt plunger 2 and plunger rod 3, which are set as a whole, into the transverse valve chamber set on the flow guide tee 1, and install the bolt plunger 2 into the threaded section 5 by rotating the plunger rod 3 through the threaded connection installation method;

[0040] (3) Assemble the rod sealing assembly: Install the gasket 19, packing assembly 20, gland 21 and pressure cap 22 from left to right on the outside of the plunger rod 3, so that the left side of the gasket 19 abuts against the right side of the threaded section 5, and tighten the pressure cap 22 to fix it on the outside of the right end of the guide tee 1.

[0041] (4) Installed to the wellhead production tree 24: The left end of the guide tee 1 is connected to the auxiliary production valve 25 through a pipeline, and the lower end of the guide tee 1 is connected to the auxiliary casing valve 26 through a pipeline;

[0042] (5) Pressure relief: By rotating the plunger rod 3, the left end of the bolt plunger 2 is pressed against the right side of the limit section 4. When the casing pressure is too high, the high pressure gas in the casing pushes open the valve plate 12, causing the valve plate 12 to move to the left. Thus, the high pressure gas in the casing passes through the auxiliary casing valve 26, the lower end of the guide tee 1, the left end of the guide tee 1, and the auxiliary production valve in sequence and enters the single well production process.

[0043] (6) Bidirectional flow: By rotating the plunger rod 3, the left end of the bolt plunger 2 is located to the right of the vertical valve chamber 7, connecting the left part of the flow guide tee 1 with the lower part of the flow guide tee 1, so that the fluid in the single well production process passes through the auxiliary production valve, the left end of the flow guide tee 1, the lower end of the flow guide tee 1 and the auxiliary casing valve 26 in sequence and enters the oil casing annulus.

[0044] The above technical features constitute the preferred embodiment of the present invention, which has strong adaptability and optimal implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A pressure-regulating and sealing release device for the casing pressure of a heavy oil well, characterized in that... The system includes a flow guide tee, a bolt plunger, a plunger rod, a regulating valve assembly, and a rod sealing assembly. The flow guide tee has a transverse valve chamber that extends through both sides. The transverse valve chamber includes a limiting section, a threaded section, and a sealing section that are connected from left to right and have progressively increasing inner diameters. A vertical valve chamber, with its upper end connected to the transverse valve chamber, is located on the lower left side of the flow guide tee corresponding to the left position of the threaded section. A bolt plunger is fixedly installed on the inner side of the left end of the threaded section via a threaded connection. A plunger rod with its right end located to the right of the flow guide tee is located in the sealing section. The left end of the plunger rod is fixedly installed together with the center of the right side of the bolt plunger. A rod sealing assembly is located between the flow guide tee and the plunger rod corresponding to the sealing section. The bolt plunger has a mounting cavity that opens to the left. A connecting hole, which communicates with the mounting cavity, is located on the outer side of the bolt plunger corresponding to the vertical valve chamber. A regulating valve assembly is located in the mounting cavity and opens when the pressure in the vertical valve chamber is greater than the pressure in the limiting section. The regulating valve assembly includes a valve seat, a mounting ring, a connecting rib, a valve rod, a valve plate, and a return spring. The mounting cavity at the left end of the corresponding connecting hole is provided with a fixing ring groove. A valve seat is fixedly installed on the inner side of the left end of the fixing ring groove. A mounting ring is provided in the valve seat. At least two connecting ribs are fixedly installed circumferentially between the outer side of the mounting ring and the inner side of the valve seat. A valve stem is provided in the mounting ring. A limiting ring platform located to the left of the mounting ring is provided on the outer side of the left end of the valve stem. A valve plate capable of sealing the mounting cavity is fixedly installed on the right end of the valve stem. The right side of the valve plate abuts against the right side of the fixing ring groove. A return spring is provided on the outer side of the valve stem at the position corresponding to the position between the mounting ring and the valve plate. The regulating valve assembly also includes an anchor rod. At least one connecting rib is provided with a mounting hole. An anchor rod with its right end limited and installed at the corresponding position inside the fixing ring groove is fixedly installed in the mounting hole. The rod sealing assembly includes a gasket, a packing assembly, a gland, and a cap. From left to right, a gasket, a packing assembly, a gland, and a cap are provided in the sealing section. The right end of the gland is located to the right of the guide tee. The outer side of the left end of the cap is fixedly installed to the outer side of the right end of the guide tee.

2. The heavy oil wellhead casing pressure regulating and sealing release device according to claim 1, characterized in that... It also includes an external pipe and a test instrument. The upper left side of the guide tee corresponding to the vertical valve chamber position is provided with a test hole that connects to the horizontal valve chamber at its lower end. The upper left side of the guide tee corresponding to the test hole position is fixedly installed with an external pipe, and a test instrument is installed on the external pipe.

3. The heavy oil wellhead casing pressure regulating and sealing release device according to claim 1 or 2, characterized in that... It also includes a handwheel, which is fixedly installed on the outer side of the right end of the plunger rod.

4. The heavy oil wellhead casing pressure regulating and sealing release device according to claim 1 or 2, characterized in that... Three connecting holes are evenly distributed around the circumference on the outer side of the bolt plunger.

5. The heavy oil wellhead casing pressure regulating and sealing release device according to claim 3, characterized in that... Three connecting holes are evenly distributed around the circumference on the outer side of the bolt plunger.

6. A method for a heavy oil wellhead casing pressure-regulating and sealing release device as described in any one of claims 1 to 5, characterized in that... The steps include the following: (1) Assemble the regulating valve assembly: Install the assembled regulating valve assembly into the mounting cavity set on the bolt plunger. The outer side of the valve seat is fixedly installed in the fixing ring groove set in the mounting cavity by threaded connection. The preload of the reset spring is adjusted by the screwing depth of the valve seat to realize the constant pressure opening of the valve plate. The anchor rod is used to prevent the valve seat from disengaging and causing the constant pressure to fail. (2) Assemble the bolt plunger: Install the integrated bolt plunger and plunger rod into the transverse valve chamber on the flow guide tee, and install the bolt plunger into the threaded section by rotating the plunger rod through a threaded connection. (3) Assemble the rod sealing assembly: Install the gasket, packing assembly, gland and cap from left to right on the outside of the plunger rod, so that the left side of the gasket abuts against the right side of the threaded section, and tighten the cap to fix it on the outside of the right end of the guide tee; (4) Installation to the wellhead production tree: The left end of the guide tee is connected to the auxiliary production valve through a pipeline, and the lower end of the guide tee is connected to the auxiliary casing valve through a pipeline; (5) Pressure relief: By rotating the plunger rod, the left end of the bolt plunger is pressed against the right side of the limit section. When the casing pressure is too high, the high pressure gas in the casing pushes open the valve plate, causing the valve plate to move to the left. Thus, the high pressure gas in the casing passes through the auxiliary casing valve, the lower end of the guide tee, the left end of the guide tee, and the auxiliary production valve in sequence and enters the single well production process. (6) Bidirectional flow: By rotating the plunger rod, the left end of the bolt plunger is positioned to the right of the vertical valve chamber, connecting the left part of the flow guide tee with the lower part of the flow guide tee, so that the fluid in the single well production process passes through the auxiliary production valve, the left end of the flow guide tee, the lower end of the flow guide tee and the auxiliary casing valve in sequence to enter the oil casing annulus.

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