A double gate valve for thermal oil extraction

Abstract

This utility model discloses a double-gate valve for thermal oil extraction, including a valve body with a flow passage. The valve body also has an upper control hole and a lower control hole that radially pass through the flow passage, with the flow passage located inside the upper and lower control holes. An upper gate and an upper gate control mechanism are sealed within the upper control hole; a lower gate and a lower gate control mechanism are sealed within the lower control hole. An anti-interference angle exists between the axes of the upper and lower control holes. The circumferential projections of the upper and lower gate control mechanisms along the flow passage overlap. This utility model can quickly handle leaks occurring at any point during steam injection, allowing for "zero-risk" repair and replacement of components, eliminating potential safety and environmental accidents, and achieving safe production.

Description

Technical Field

[0001] This utility model relates to the field of petroleum development technology, specifically a double gate valve for thermal oil extraction. Background Technology

[0002] Currently, thermal recovery is the dominant technology in heavy oil development. When using steam injection or steam drive, a steam injection wellhead needs to be installed on the injection well. Each steam injection wellhead device includes six gate valves, such as... Figure 3 As shown, the valves are production valve A, steam injection valve B, vent valve C, test valve D, left-side casing valve E, and right-side casing valve F. Each valve operates on the same principle. They are used for the passage and shut-off of high-temperature, high-pressure steam. During field applications, various thermal recovery gate valves may experience seal failures such as: gate valve cover flange seal failure; valve seat gate and valve stem packing gland seal failure; valve seat gate metal seal failure; gate and valve stem connection failure; and valve stem breakage. If production valve A experiences a seal failure or leakage at the connection between the production valve and the upper flange, it will inevitably lead to uncontrollable well pressure, causing serious well control safety issues, environmental pollution, economic losses, and even endangering personal safety.

[0003] Announcement No.: CN222315982U discloses a flat gate valve with a connecting sealing structure, including a valve body, a valve chamber provided on the inner wall of the valve body, the valve chamber including an open flow groove and a closed flow groove, the open flow groove being located above the closed flow groove, a flat gate being slidably connected in the valve chamber, and flow guide ports being formed on both sides of the valve chamber, a sealing ring being fixedly connected to the inner wall of the flow guide port, the outer wall of the sealing ring being bonded to the inner wall of the flow guide port.

[0004] The existing technology is a single gate valve, which can cause serious well control safety issues if it fails.

[0005] Publication No. CN104005726A discloses an oil wellhead device capable of safely replacing leaking valves, consisting of a tubing head section and a Christmas tree section. The tubing head has two-wing flat gate valves, designated as valves 2, 3, 5, and 6. In operation, a single wing is typically used. Each wing has two flat valves; closing either valve shuts off the flow. If any of the other flat valves leaks, shutting off the flow allows for safe replacement of the leaking valve. The Christmas tree has main flat gate valves designated as valves 1, 4, and 7, and two-wing flat gate valves designated as valves 8 and 9. Adjustable flow valves on both wings are used to regulate the flow rate in the flow channels.

[0006] The existing technology uses a large number of gate valves, resulting in high costs and a large space requirement.

[0007] Announcement No. CN112302553B discloses an operation method for replacing a casing gate valve at a gas injection wellhead under pressure, comprising the following steps: selecting the gas injection wellhead to which the casing gate valve to be replaced as the target well; selecting the target casing gate valve at the wellhead of the target well; connecting the pressure-replacing gate valve device to the target casing gate valve; removing the target casing gate valve and replacing it with a new casing gate valve; and disengaging the pressure-replacing gate valve device to complete the replacement of the target casing gate valve.

[0008] The existing technology uses a large number of gate valves in the wellhead, resulting in high costs and a large space requirement.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides a double gate valve for thermal oil extraction.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A double-gate valve for thermal oil extraction includes a valve body with a flow passage. The valve body has an upper control hole and a lower control hole that radially pass through the flow passage, with the flow passage located inside the upper and lower control holes. An upper gate and an upper gate control mechanism are sealed inside the upper control hole. A lower gate and a lower gate control mechanism are sealed inside the lower control hole. There is an anti-interference angle between the axis of the upper control hole and the axis of the lower control hole. The circumferential projection of the upper gate control mechanism along the flow passage overlaps with the circumferential projection of the lower gate control mechanism along the flow passage.

[0013] Furthermore, the valve body is provided with a threaded connector at the lower end of the flow passage, and a flange connector is provided at the upper end of the flow passage.

[0014] Furthermore, the upper gate and the valve body are surface-sealed, and the lower gate and the valve body are surface-sealed.

[0015] Furthermore, upper valve seats are embedded at both ends of the inner wall of the flow passage where it intersects with the upper control hole. The end face of the upper valve seat near the upper gate plate is metal-sealed with the upper gate plate. The upper valve seat and the valve body are sealed by an upper valve seat sealing ring.

[0016] Specifically, the inner wall of the flow passage is fitted with lower valve seats at both ends where it intersects with the lower control hole. The end face of the lower valve seat near the lower gate is metal-sealed with the lower gate. The lower valve seat and the valve body are sealed by a lower valve seat sealing ring.

[0017] Furthermore, the upper and lower gates are perforated gates, and the valve is opened when the perforation coincides with the flow channel.

[0018] Furthermore, the upper gate control mechanism or the lower gate control mechanism includes a valve stem, a valve cover, a valve stem nut, and a sealing end cap;

[0019] Specifically, the upper control hole or the lower control hole is a control hole, and the upper gate or the lower gate is a gate;

[0020] Specifically, the valve stem passes through the control hole and connects to the gate. The outer wall of the valve stem away from the gate is threaded. The valve cover is fitted over the valve stem and is sealed to the valve body. A sealing element is provided on the inner wall of the valve cover to seal the valve stem. The valve stem is threaded to a valve stem nut. The valve stem nut is rotatably connected to the valve stem through an axial positioning element. The sealing end cap is sealed to the end of the control hole away from the valve cover.

[0021] Furthermore, the sealing element includes a sealing seat, a valve stem sealing packing, and a packing gland;

[0022] Specifically, a sealing seat is provided on the inner wall of the valve cover, the sealing seat is filled with valve stem sealing packing, and a packing gland is placed on the valve cover at the port away from the gate.

[0023] Specifically, the axial positioning component includes a bearing housing and an axial load bearing. The bearing housing is connected to the valve cover. The bearing housing presses against the packing gland cover. The packing gland cover presses against the valve stem sealing packing. The axial load bearing is fixedly installed inside the bearing housing. The moving ring of the axial load bearing is connected to the valve stem nut. The valve stem nut extends out of the bearing housing.

[0024] Furthermore, the bearing housing sidewall is provided with screw fastening holes and grease nipples. The screw fastening holes are used to connect and fasten screws to lock the valve stem nut, and the grease nipples are used to inject grease into the axial load bearing.

[0025] Specifically, a grease injection nozzle is provided on the outer wall of the valve cover. The grease injection nozzle is connected to the control hole through an L-shaped channel, and sealing grease is injected through the grease injection nozzle.

[0026] Furthermore, the end of the valve stem nut furthest from the gate is a connecting handle.

[0027] Furthermore, the valve stem nut is connected to a handwheel at its end outside the bearing housing, and a threaded protective cap is installed on the outside of the handwheel. A radial observation window is provided on the side wall of the threaded protective cap.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] 1. The dual-gate production valve of this utility model has the characteristics of high integration, separate control, independent sealing and no interference between them. This utility model can solve the problem of rapid handling of leakage in any part during steam injection, and can repair and replace each component with "zero risk", eliminating the safety and environmental accidents caused by it and realizing safe production.

[0030] 2. This utility model is connected to the lower pipe string by thread, which has the advantages of convenient processing, reasonable structure and easy loading and unloading. During operation, the thermal wellhead device can be safely installed and disassembled, eliminating the illegal phenomenon that the upper part of the wellhead must be used to lift the load of the entire well. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the internal structure of a double gate valve for thermal oil extraction according to this utility model.

[0032] Figure 2 This is a schematic diagram of the external structure of a double gate valve for thermal oil extraction according to this utility model.

[0033] Figure 3 It is an existing production oil tree.

[0034] In the diagram: Valve body 1, threaded connector 11, flange connecting plate 12;

[0035] Lower gate 101, lower valve seat 102, lower valve seat sealing ring 103, lower valve stem 104, lower valve cover 105, lower valve stem nut 106, lower sealing end cover 107, lower sealing element 108, lower packing gland 109, lower bearing box 1010, lower handwheel 1013;

[0036] Upper gate 201, upper valve seat 202, upper valve seat sealing ring 203, upper valve cover 205, upper sealing end cover 207, upper bearing box 2010, upper screw fastening hole 2011, upper grease nipple 2012, upper handwheel 2013, upper grease injection hole 2014;

[0037] Production valve A, steam injection valve B, vent valve C, test valve D, left-side sleeve valve E, right-side sleeve valve F. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Example 1:

[0040] Please see Figures 1 to 2 This utility model provides a double gate valve for thermal oil extraction, comprising a valve body 1, wherein the valve body 1 is provided with a flow passage hole, and an upper control hole and a lower control hole radially passing through the flow passage hole. The flow passage hole is located inside the upper control hole and the lower control hole, and there is an anti-interference angle between the axis of the upper control hole and the axis of the lower control hole. An upper gate 201 is sealed inside the upper control hole, and an upper gate control mechanism is connected to one port of the upper control hole on the side wall of the valve body 1. The upper gate control mechanism is connected to the upper gate 201. A lower gate 101 is sealed inside the lower control hole, and a lower gate control mechanism is connected to one port of the lower control hole on the side wall of the valve body 1. The lower gate control mechanism is connected to the lower gate 101. The circumferential projection of the upper gate control mechanism along the flow passage overlaps with the circumferential projection of the lower gate control mechanism along the flow passage, thereby reducing the height of the valve body 1.

[0041] Preferably, the anti-interference angle is 90°.

[0042] Specifically, the valve body 1 has a threaded connector 11 at the lower end of the flow passage, and a flange connector 12 at the upper end of the flow passage. The threaded connector 11 is an APIRT round thread. When installing the steam injection wellhead, it is matched with the lifting short section type, which can completely avoid steel ring leakage caused by accidental stress (50t) on the wellhead device.

[0043] Specifically, the upper gate 201 and the valve body 1 are surface-sealed, and the lower gate 101 and the valve body 1 are surface-sealed.

[0044] Specifically, upper valve seats 202 are embedded at both ends of the inner wall of the flow passage where it intersects with the upper control hole. The end face of the upper valve seat 202 near the upper gate 201 is metal-sealed with the upper gate 201. The upper valve seat 202 and the valve body 1 are sealed by an upper valve seat sealing ring 203.

[0045] Specifically, the inner wall of the flow passage is fitted with a lower valve seat 102 at both ends where it intersects with the lower control hole. The end face of the lower valve seat 102 near the lower gate 101 is metal-sealed with the lower gate 101. The lower valve seat 102 is sealed to the valve body 1 by a lower valve seat sealing ring 103.

[0046] Specifically, the upper gate 201 and the lower gate 101 are perforated gates. When the holes on the gates coincide with the flow channels, the valve is turned on.

[0047] Furthermore, the upper gate control mechanism includes an upper valve stem, an upper valve cover 205, an upper valve stem nut, and an upper sealing end cover 207. The upper valve stem passes through the upper control hole and connects to the upper gate 201. The outer wall of the end of the upper valve stem away from the upper gate 201 is threaded. The upper valve cover 205 is fitted over the upper valve stem. The upper valve cover 205 is sealed to the valve body 1 by bolts and a sealing gasket. The inner wall of the upper valve cover 205 is provided with an upper sealing element to seal the upper valve stem. The upper valve stem is threaded to the upper valve stem nut. The upper valve stem nut is rotatably connected to the upper valve stem through an upper axial positioning element. By rotating the upper valve stem nut, the upper valve stem moves back and forth, thereby realizing the opening and closing of the flow hole. The upper sealing end cover 207 is sealed to the end of the upper control hole away from the upper valve cover 205 by bolts and a sealing gasket.

[0048] Specifically, the upper sealing element includes an upper sealing seat, an upper valve stem sealing packing, and an upper packing gland. The upper sealing seat is provided on the inner wall of the upper valve cover 205, and the upper sealing seat is filled with the upper valve stem sealing packing. The upper packing gland is placed at the port of the upper valve cover 205 away from the upper gate 201. The axial positioning element includes an upper bearing housing 2010 and an upper axial load bearing. The upper bearing housing 2010 is connected to the upper valve cover 205 by threads. The upper bearing housing 2010 presses the upper packing gland, and the upper packing gland presses the upper valve stem sealing packing. The upper axial load bearing is fixedly installed inside the upper bearing housing 2010. The moving ring of the upper axial load bearing is fixedly connected to the upper valve stem nut, and the upper valve stem nut extends out of the upper bearing housing 2010.

[0049] Preferably, the upper valve stem sealing packing is a graphite packing to ensure reliable sealing under high temperature and high pressure conditions.

[0050] Specifically, the upper bearing housing 2010 has an upper screw fastening hole and an upper grease nipple on its side wall. The upper screw fastening hole is used to connect and fasten the upper valve stem nut with a fastening screw, and the upper grease nipple is used to inject grease into the upper axial load bearing. The upper valve cover 205 has an upper grease injection nipple 2014 on its outer wall. The upper grease injection nipple is connected to the upper control hole through an L-shaped channel, and sealing grease is injected through the upper grease injection nipple.

[0051] Specifically, the end of the upper valve stem nut away from the upper gate is machined into a square or hexagonal shape, which engages with the square or hexagonal hole in the center of the upper handwheel 2013. A threaded protective cap is installed on the outside of the upper handwheel 2013, and a radial observation window is provided on the side wall of the threaded protective cap. Rotating the upper handwheel 2013 can lock the rotation of the upper valve stem nut, thereby fixing the position of the upper gate.

[0052] Specifically, the upper valve stem nut is connected to a handwheel 2013 at the end outside the upper bearing housing 2010 for easy manual rotation.

[0053] Preferably, the upper axial load bearing is a double-direction thrust bearing or two tapered bearings, and the outer wall of the upper valve stem nut is provided with a cylindrical section. The upper valve stem nut is axially positioned by interference fit between the cylindrical section and the moving ring of the upper axial load bearing.

[0054] Furthermore, the lower gate control mechanism has the same structure as the upper gate control mechanism. The lower gate control mechanism includes a lower valve stem 104, a lower valve cover 105, a lower valve stem nut 106, and a lower sealing end cover 107. The lower valve stem 104 passes through the lower control hole and connects to the lower gate 101. The outer wall of the lower valve stem away from the lower gate 101 is threaded. The lower valve cover 105 is fitted over the lower valve stem. The lower valve cover 105 is sealed to the valve body 1 by bolts and a sealing gasket. The inner wall of the lower valve cover 105 is provided with a lower sealing element 108 to seal the lower valve stem 104. The lower valve stem is threaded to the lower valve stem nut 106. The lower valve stem nut is rotatably connected to the lower valve stem 104 by a lower axial positioning element. By rotating the lower valve stem nut 106, the lower valve stem 104 moves back and forth, thereby realizing the opening and closing of the flow hole. The lower sealing end cover 107 is sealed to the lower control hole away from the lower valve cover 105 by bolts and a sealing gasket.

[0055] Specifically, the lower sealing element includes a lower sealing seat, a lower valve stem sealing packing, and a lower packing gland. The lower sealing seat is provided on the inner wall of the lower valve cover 105. The lower sealing seat is filled with the lower valve stem sealing packing. The lower packing gland is placed at the port of the lower valve cover 105 away from the lower gate 101. The axial positioning element includes a lower bearing housing 1010 and a lower axial load bearing. The lower bearing housing 1010 is connected to the lower valve cover 105 by threads. The lower bearing housing 1010 presses against the lower packing gland. The lower packing gland 109 presses against the lower sealing element 108. The lower axial load bearing is fixedly installed inside the lower bearing housing 1010. The moving ring of the lower axial load bearing is fixedly connected to the lower valve stem nut. The lower valve stem nut extends out of the lower bearing housing 1010.

[0056] Preferably, the lower valve stem sealing packing is a graphite packing to ensure reliable sealing under high temperature and high pressure conditions.

[0057] Specifically, the lower bearing housing 1010 has a lower screw fastening hole and a lower grease nipple on its side wall. The lower screw fastening hole is used to connect and fasten the screw to lock the lower valve stem nut, and the lower grease nipple is used to inject grease into the bearing under downward axial load. The lower valve cover 105 has a lower grease injection nipple on its outer wall. The lower grease injection nipple is connected to the lower control hole through an L-shaped channel and sealant is injected through the lower grease injection nipple.

[0058] Specifically, the end of the lower valve stem nut away from the lower gate plate 101 is machined into a square or hexagonal shape, which engages with the square or hexagonal hole in the center of the lower handwheel 1013. A threaded protective cap is installed on the outside of the lower handwheel 1013, and a radial observation window is provided on the side wall of the threaded protective cap. Rotating the lower handwheel 1013 can lock the rotation of the lower valve stem nut 106, thereby fixing the position of the lower gate plate 101.

[0059] Specifically, the lower valve stem nut is connected to the lower handwheel 1013 at the end outside the lower bearing housing 1010 for easy manual rotation.

[0060] Preferably, the lower axial load bearing is a double-direction thrust bearing or two tapered bearings, and the outer wall of the lower valve stem nut is provided with a cylindrical section. The lower valve stem nut is axially positioned by interference fit between the cylindrical section and the moving ring of the lower axial load bearing.

[0061] Furthermore, the circumferential projection of the upper valve cover 205 along the axis of the flow hole overlaps with the circumferential projection of the lower valve cover 105 along the axis of the flow hole, saving space.

[0062] Example 2:

[0063] Based on Example 1, Figure 3 The production valve A and lower flange at the steam injection wellhead shown are replaced with the aforementioned double-gate valve and matching threaded lower flange. The upper end is sealed using a flange connection as before, while the lower end is sealed using a threaded connection. During normal steam injection, the upper gate 201 is opened and closed to allow and shut off the medium, while the lower gate 101 remains open for emergency backup. If the upper gate 201 is damaged and cannot be effectively controlled, the lower gate 101 is immediately activated to quickly shut down the well. After safety rectification, production is resumed.

[0064] The double gate valve underwent strength testing by a third party with Sinopec's Class A well control qualification. The pressure was 52.5 MPa, pressurized twice, and stabilized for 3 minutes, with a pressure drop of less than 5%. The sealing pressure test was conducted at 35 MPa, with the valve pressurized twice and stabilized for 3 minutes, with a pressure drop of less than 5%, which met the requirements.

[0065] After safety assessment and verification with the company's safety department, business department, and manufacturer, the system was installed and tested at a well in a certain management area, with continuous steam injection for 18 days and a steam injection volume of 2000m³. 3 The pressure was 16.4 MPa, the temperature was 356℃, and the sealing performance was good. An emergency response was conducted to simulate a leak at the steam injection wellhead. The lower gate was closed under pressure, and after depressurization of the downstream area, seals, small steel rings, and other accessories were replaced on-site. No well control or safety risks were found during the exercise, achieving the expected design effect. This fully guarantees the rapid handling of damage and leaks during steam injection, ensuring safe production for the unit.

[0066] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0067] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0068] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0069] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0070] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A double disc valve for thermal recovery of oil, comprising a valve body provided with a through-flow opening, characterized in that, The valve body is provided with an upper control hole and a lower control hole that radially pass through the flow hole, and the flow hole is inside the upper control hole and the lower control hole; The upper control hole is sealed with an upper gate and an upper gate control mechanism; the lower control hole is sealed with a lower gate and a lower gate control mechanism. There is an anti-interference angle between the axis of the upper control hole and the axis of the lower control hole; The circumferential projection of the upper gate control mechanism along the flow channel overlaps with the circumferential projection of the lower gate control mechanism along the flow channel.

2. The double-gate valve for thermal oil extraction according to claim 1, characterized in that, The valve body has a threaded connector at the lower end of the flow passage and a flange connector at the upper end of the flow passage.

3. A double-gate valve for thermal oil extraction according to claim 1, characterized in that, The upper gate and the valve body are sealed together by a surface seal, and the lower gate and the valve body are sealed together by a surface seal.

4. A double-gate valve for thermal oil extraction according to claim 3, characterized in that, Upper valve seats are embedded at both ends of the inner wall of the flow passage where it intersects with the upper control hole. The end face of the upper valve seat near the upper gate is metal-sealed with the upper gate. The upper valve seat and the valve body are sealed by an upper valve seat sealing ring. The inner wall of the flow passage is fitted with lower valve seats at both ends where it intersects with the lower control hole. The end face of the lower valve seat near the lower gate is metal-sealed with the lower gate. The lower valve seat and the valve body are sealed by a lower valve seat sealing ring.

5. A double-gate valve for thermal oil extraction according to claim 1, characterized in that, The upper and lower gates are perforated gates. When the perforation coincides with the flow channel, the valve is opened.

6. A double-gate valve for thermal oil extraction according to claim 1, characterized in that, The upper gate control mechanism or the lower gate control mechanism includes a valve stem, a valve cover, a valve stem nut, and a sealing end cap; The upper control hole or lower control hole is a control hole, and the upper gate or lower gate is a gate; The valve stem passes through the control hole and connects to the gate. The outer wall of the valve stem away from the gate is threaded. The valve cover is fitted over the valve stem and is sealed to the valve body. A sealing element is provided on the inner wall of the valve cover to seal the valve stem. The valve stem is threaded to a valve stem nut. The valve stem nut is rotatably connected to the valve stem through an axial positioning element. The sealing end cap is sealed to the end of the control hole away from the valve cover.

7. A double-gate valve for thermal oil extraction according to claim 6, characterized in that, The sealing element includes a sealing seat, a valve stem sealing packing, and a packing gland. A sealing seat is provided on the inner wall of the valve cover, and the sealing seat is filled with valve stem sealing packing. A packing gland is placed on the valve cover at the port away from the gate. The axial positioning component includes a bearing housing and an axial load bearing. The bearing housing is connected to the valve cover. The bearing housing presses against the packing gland, and the packing gland presses against the valve stem sealing packing. The axial load bearing is fixedly installed inside the bearing housing. The moving ring of the axial load bearing is connected to the valve stem nut, and the valve stem nut extends out of the bearing housing.

8. A double-gate valve for thermal oil extraction according to claim 7, characterized in that, The bearing housing sidewall is provided with screw fastening holes and grease nipples. The screw fastening holes are used to connect fastening screws to lock the valve stem nut. The grease nipples are used to inject grease into the axial load bearing. The valve cover is provided with a grease injection nozzle, which is connected to the control hole through an L-shaped channel, and sealing grease is injected through the grease injection nozzle.

9. A double-gate valve for thermal oil extraction according to claim 7, characterized in that, The end of the valve stem nut furthest from the gate is the connecting handle.

10. A double-gate valve for thermal oil extraction according to claim 7, characterized in that, The valve stem nut is connected to a handwheel at its end outside the bearing housing. A threaded cap is installed on the outside of the handwheel, and a radial observation window is provided on the side wall of the threaded cap.

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