One-way gas bleed device for oilfield pumping unit well casing pressure balancing

Abstract

The utility model provides a kind of one-way gas release device for oilfield pumping unit well casing pressure balance, including butt joint and air core;Butt joint is hollow structure, and the two ends of butt joint are used to connect with oilfield pumping unit well casing;Air core includes hollow body, and body is arranged in the hollow structure of butt joint, and is sealingly connected with butt joint;It also includes valve stem being threaded in body, and valve stem includes top end, stem body and base being arranged in sequence, and the outer diameter of stem body is less than the inner diameter of body;The top end of valve stem is threaded out one end of body, and there is elastomer between top end and one end of body;The base of valve stem is threaded out the other end of body, and the diameter of base is greater than the inner diameter of body and has sealing structure;Base and body are sealingly connected under normal state, and air passage is blocked;Under high-pressure gas, top end extrudes elastomer, stem body moves to base direction, so that gap is generated between base and body, and air passage is communicated.

Description

Technical Field

[0001] This utility model belongs to the field of oil well production in petroleum extraction, specifically relating to a one-way venting device for pressure balancing of the casing of oilfield pumping wells. Background Technology

[0002] In the past, oil wells commonly used open casing production, where the gas generated inside the casing was directly connected to the atmosphere, thus having little impact on the operation of the deep well pump. However, as companies have become increasingly stringent in their environmental protection requirements, the open casing production model is no longer suitable for current environmental needs, making closed casing production an inevitable trend.

[0003] After implementing closed-loop production, the continuous generation of associated gas in the pumping unit well causes a steady increase in casing pressure, which can adversely affect the normal operation of the deep well pump. If a problem occurs, the gas in the casing at the pumping unit wellhead must first be released, followed by measures such as casing injection, well flushing, and other operations to restore normal production. However, such operations not only pose safety risks and waste resources but also increase workload, significantly impacting the production efficiency and stability of the pumping unit well. Utility Model Content

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, this utility model proposes a one-way venting device for pressure balance of oilfield pumping well casing.

[0005] To achieve the above objectives, this utility model provides a one-way venting device for pressure balancing in oilfield pumping well casing, comprising a connecting joint and a gas core; wherein,

[0006] The butt joint has a hollow structure, and its two ends are used to connect to the casing of oilfield pumping wells.

[0007] The gas core includes a hollow body, which is disposed in the hollow structure of the mating joint and sealed to the mating joint; it also includes a valve stem passing through the body, the valve stem including a top end, a rod body and a base arranged in sequence, the outer diameter of the rod body is smaller than the inner diameter of the body, so that the rod body and the interior of the body have a gas passage for gas to pass through; the top end of the valve stem protrudes from one end of the body, and an elastic body is provided between the top end and one end of the body; the base of the valve stem protrudes from the other end of the body, the diameter of the base is larger than the inner diameter of the body and has a sealing structure;

[0008] The length of the rod allows for the following: under normal conditions, the base and the main body are sealed together, and the air passage is blocked; at the top, the elastic body is squeezed under high pressure, and the rod moves towards the base, creating a gap between the base and the main body, thus opening the air passage.

[0009] According to the above scheme, both ends of the butt joint have external threads for connection with the casing of the oilfield pumping unit.

[0010] According to the above scheme, the outer surface of the middle part of the joint is a hexagonal prism.

[0011] According to the above scheme, the internal thread of the mating joint is provided, the body of the air core is provided with external thread and sealing ring, the mating joint and the air core are connected by internal thread and external thread and sealed by sealing ring.

[0012] According to the above scheme, one end of the body is provided with a limiting flange for limiting the rod body, the top end of the valve stem has a boss, the elastic body is sleeved on the rod body, and the two ends of the elastic body are in contact with the limiting flange and the boss respectively.

[0013] According to the above scheme, the other end of the main body has a conical groove, the base has a conical plug that matches the conical groove, and the bottom of the conical plug is provided with a sealing structure.

[0014] According to the above scheme, the sealing structure is a sealing ring.

[0015] According to the above scheme, the elastic body is a spring.

[0016] According to the above scheme, the air core is a vehicle air conditioning air core.

[0017] According to the above scheme, one end of the butt joint on the same side as the top of the valve stem is connected to the high-pressure zone of the pumping unit casing; the other end of the butt joint on the same side as the base of the valve stem is connected to the low-pressure zone of the pumping unit casing.

[0018] In summary, compared with the prior art, the above-described technical solution conceived by this utility model can achieve the following beneficial effects:

[0019] 1. By installing a butt joint on the casing of the pumping unit and an air core in the butt joint, the automatic air release when there is high pressure on one side is achieved by using the cooperation of the elastomer and the valve stem, so that the pressure at both ends of the casing can be kept in a relatively balanced state.

[0020] 2. It directly adopts the air core of automotive air conditioning, which only requires the processing of a single docking connector. It is simple to process, inexpensive, and easy to use. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a device structure provided in an embodiment of the present utility model.

[0022] Figure 2 This is a cross-sectional view of a device structure provided in an embodiment of this utility model.

[0023] Figure 3 This is an external view of the air core structure provided in an embodiment of this utility model.

[0024] Figure 4 This is a cross-sectional view of the air core structure provided in an embodiment of this utility model.

[0025] In the diagram: 1-Matching joint, 101-First external thread, 102-Second external thread, 103-Hexagonal prism, 2-High pressure zone, 3-Air core, 301-Body, 3011-Third thread, 3012-Limiting flange, 3021-Rod, 3022-Top, 3023-Base, 30231-Conical plug, 3031-First sealing ring, 3032-Second sealing ring, 304-Elastomer, 4-Low pressure zone, 5-Air passage. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] This embodiment provides a one-way venting device for pressure balancing in oilfield pumping unit well casing, such as... Figures 1 to 4 As shown, it includes a docking connector 1 and an air core 3.

[0030] The butt joint 1 has a hollow structure, and its two ends are used to connect with the casing of an oilfield pumping unit well. More specifically, both ends of the butt joint 1 have external threads for threaded connection with the casing of the oilfield pumping unit well. In this embodiment, as shown... Figure 1 As shown, the mating joint 1 is a machined part, including a first external thread 101 and a second external thread 102 at both ends, connected in the middle by a hexagonal prism 103, which facilitates machining and installation. Furthermore, one end of the mating joint 1 also has an internal thread for connection with the air core 3.

[0031] The gas core 3 includes a hollow body 301, which is disposed in the hollow structure of the mating joint 1 and is sealed to the mating joint 1. In some embodiments, it can be connected to the internal thread of the mating joint 1 by a third thread 3011 disposed on the outer surface of the body 301, and sealed by a first sealing ring 3031. The gas core 3 also includes a valve stem passing through the body 301. The valve stem includes a top end 3022, a rod body 3021, and a base 3023 arranged sequentially. The outer diameter of the rod body 3021 is smaller than the inner diameter of the body 301, so that the rod body 3021 and the interior of the body 301 have a gas passage 5 for gas to pass through. The top end 3022 of the valve stem protrudes from one end of the body 301, and an elastic body 3004 is provided between the top end 3022 and one end of the body 301. The base 3023 of the valve stem protrudes from the other end of the body 301. The diameter of the base 3023 is larger than the inner diameter of the body 301 and has a sealing structure. In this embodiment, the sealing structure is a second sealing ring 3032.

[0032] During installation, one end of the mating joint 1, which is on the same side as the top of the valve stem 3022, connects to the high-pressure zone 2 of the pumping unit casing; the other end of the mating joint 1, which is on the same side as the base 3023 of the valve stem, connects to the low-pressure zone 4 of the pumping unit casing. The length of the rod 3021 is such that, under normal conditions, the base 3023 and the body 301 are sealed together by the second sealing ring 3032, blocking the air passage 5; when the top of the valve stem 3022 is compressed by the elastic body 304 under high-pressure gas, the rod 3021 moves towards the base 3023, creating a gap between the base 3023 and the body 301, thus opening the air passage 5. The "normal condition" refers to a situation where the pressure difference between the high-pressure zone 2 and the low-pressure zone 4 is within a certain range, insufficient to compress the elastic body 304 and push the rod 3021 towards the base 3023.

[0033] During the production of sealed casing in an oil well, the gas pressure inside the casing continuously rises. When the pressure in high-pressure zone 2 is higher than that in low-pressure zone 4 by a certain margin, the gas in high-pressure zone 2 will press against the top of the valve stem 3022. Under this pressure, the top of the valve stem 3022 compresses the elastic body 304, causing the stem 3021 to move towards low-pressure zone 4. At this point, the gas passage 5 inside the gas core 3 is opened, the connection between high-pressure zone 2 and low-pressure zone 4 is established, and the gas in high-pressure zone 2 can flow into low-pressure zone 4.

[0034] When the pressure difference between high-pressure zone 2 and low-pressure zone 4 falls below a certain pressure, the elastic force generated by the resetting elastic body 304 will push the top of the valve stem 3022, causing it to move towards high-pressure zone 2. At the same time, the second sealing ring 3032 on the base 3023 of the valve stem closes the air passage 5. At this time, the connection between high-pressure zone 2 and low-pressure zone 4 is broken, thereby maintaining the pressure at both ends in a relatively balanced state.

[0035] Continue as Figure 4 As shown, in some embodiments, one end of the body 301 is provided with a limiting flange 3012 for limiting the position of the rod 3021, the top end 3022 of the valve stem has a boss, and an elastic body 304 is sleeved on the rod 3021, with both ends of the elastic body 304 contacting the limiting flange 3012 and the boss, respectively. The elastic body 304 is typically a spring. This design can prevent the valve stem 3021 from moving within the body 301, while providing some support to both ends of the elastic body 304.

[0036] Continue as Figure 4 As shown, in some embodiments, the other end of the body 301 has a conical groove, and the base 3023 has a conical plug 30231 that matches the conical groove. The bottom of the conical plug 30231 is provided with a sealing structure, namely a second sealing ring 3032. This design makes the contact and separation of the base 3023 and the body 301 smoother, and also allows for a larger opening and faster gas discharge when the gas transfers from the high-pressure zone 2 to the low-pressure zone 4.

[0037] More preferably, a vehicle air conditioning air core is directly selected as the air core 3, and then a mating joint 1 suitable for the inner diameter of the sleeve and the vehicle air conditioning air core is machined. The mating joint is simple to machine, inexpensive, and easy to use. For example, in some embodiments, a vehicle air conditioning air core of model R134A and a machined threaded joint are used. The air core is connected to the threaded joint through threads to achieve a seal.

[0038] This invention utilizes the unidirectional conduction function of the gas core 3 under a certain pressure difference to dynamically achieve a balanced state between the casing pressure and the system pressure during the production of the pumping well.

[0039] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this utility model.

[0040] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A one-way venting device for pressure balancing in oilfield pumping well casing, characterized in that: Includes docking joints and air cores; among which, The butt joint has a hollow structure, and its two ends are used to connect to the casing of oilfield pumping wells. The gas core includes a hollow body, which is disposed in the hollow structure of the mating joint and sealed to the mating joint; it also includes a valve stem passing through the body, the valve stem including a top end, a rod body and a base arranged in sequence, the outer diameter of the rod body is smaller than the inner diameter of the body, so that the rod body and the interior of the body have a gas passage for gas to pass through; the top end of the valve stem protrudes from one end of the body, and an elastic body is provided between the top end and one end of the body; the base of the valve stem protrudes from the other end of the body, the diameter of the base is larger than the inner diameter of the body and has a sealing structure; The length of the rod allows for the following: under normal conditions, the base and the main body are sealed together, and the air passage is blocked; at the top, the elastic body is squeezed under high pressure, and the rod moves towards the base, creating a gap between the base and the main body, thus opening the air passage.

2. The one-way venting device for pressure balancing of oilfield pumping well casing according to claim 1, characterized in that: The two ends of the butt joint have external threads for connection with the casing of oilfield pumping unit wells.

3. The one-way venting device for pressure balancing of oilfield pumping well casing according to claim 1, characterized in that: The outer surface of the middle part of the mating joint is a hexagonal prism.

4. The one-way venting device for pressure balancing of oilfield pumping well casing according to claim 1, characterized in that: The mating joint has an internal thread, and the air core body has an external thread and a sealing ring. The mating joint and the air core are connected by the internal and external threads and sealed by the sealing ring.

5. The one-way venting device for pressure balancing of oilfield pumping well casing according to claim 1, characterized in that: One end of the body is provided with a limiting flange for limiting the rod body, the top end of the valve stem has a boss, the elastic body is sleeved on the rod body, and the two ends of the elastic body are in contact with the limiting flange and the boss respectively.

6. The one-way venting device for pressure balancing of oilfield pumping well casing according to claim 1, characterized in that: The other end of the body has a conical groove, and the base has a conical plug that matches the conical groove. The bottom of the conical plug has a sealing structure.

7. The one-way venting device for pressure balancing of oilfield pumping well casing according to claim 1 or 6, characterized in that: The sealing structure is a sealing ring.

8. The one-way venting device for pressure balancing of oilfield pumping well casing according to claim 1, characterized in that: The elastic body is a spring.

9. The one-way venting device for pressure balancing of oilfield pumping well casing according to claim 1, characterized in that: The air core is a car air conditioning air core.

10. The one-way venting device for pressure balancing of oilfield pumping well casing according to claim 1, characterized in that: One end of the butt joint, which is on the same side as the top of the valve stem, connects to the high-pressure zone of the pumping unit casing; the other end of the butt joint, which is on the same side as the base of the valve stem, connects to the low-pressure zone of the pumping unit casing.

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