Constant pressure air release valve for casing of electric submersible pump well with process operation stabilization function

Abstract

The present invention discloses a constant-pressure air bleed valve for casing of an electric submersible pump well with a process operation stabilization function, relates to the technical field of air bleed valves, is improved and optimized based on the basic principle of the air bleed valve, uses repulsive force as prestress, and uses an air-permeable gap as the only channel in the exhaust process, specifically: a primary air sheet, a secondary air sheet and an air-blocking ring group are arranged according to the position of the air-permeable gap, and the pneumatic column is driven to move upward as the gas pressure rises, and a gas pressure "deceleration" process is formed between the primary air sheet and the secondary air groove, and between the secondary air sheet and the primary air groove during the upward movement, and an intermediate air groove and a cooperating air pipe are obtained based on the improvement of the piston block, which are used in the high-pressure gas discharge process to form a secondary air bleed action, the essence of which is: in the high-pressure gas discharge process, the gas pressure "deceleration" process is used to reduce the movement amplitude of the piston block, so as to avoid the high-pressure gas discharge process increasing the workload of the piston block during the movement process, so that the gas discharge process remains in a relatively stable state.

Description

Technical Field

[0001] The invention relates to the technical field of air release valves, and in particular to a constant-pressure air release valve for an electric submersible pump well casing with a process operation stabilization function. Background Art

[0002] The purpose of adding a bleed valve to an ESP is to adjust the casing pressure of the ESP well. Its essence is that when the gas pressure reaches the upper pressure limit, the valve stem is pushed open to exhaust gas until the gas pressure is lower than the upper pressure limit and then it automatically resets and reseals. The structure of a conventional bleed valve is relatively simple, such as using a spring, rubber airbag, etc. as a gas limiting structure, which essentially combines gas pressure and mechanical movement.

[0003] For the more complex downhole environment, when the gas pressure is momentarily greater than the upper pressure limit during a period of time, the exhaust action is performed, and the "pressure burden" borne by the gas limiting structure is greater; or the downhole environmental pressure is "sometimes high, sometimes low", and the gas limiting structure performs multiple reciprocating actions of connection / sealing, which can be understood as directly increasing the workload of the gas limiting structure and causing operating losses. Taking the spring structure as an example, the spring structure produces local mechanical fatigue after multiple compression / reset actions, which directly affects the upper pressure limit. Specifically, when the spring structure is mechanically fatigued, the upper pressure limit of the air release valve in the actual state is less than the preset upper pressure limit, and even directly affects the exhaust and sealing actions. This application proposes a solution to this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a constant-pressure air bleed valve for an electric submersible pump well casing with a process operation stabilization function. For the air bleed valve used in the electric submersible pump, because the downhole environmental pressure is relatively complex, such as instantaneous high pressure and "fluctuating" pressure, which leads to operating losses in the air limiting structure in the conventional air bleed valve, there is a deviation in the preset upper pressure limit.

[0005] The object of the present invention can be achieved by the following technical scheme: a constant pressure air release valve for casing of an electric submersible pump well with a process operation stabilization function, comprising a valve body and a controller, a piston block and a cooperative sleeve are respectively slidably installed inside the valve body in a direction from top to bottom, a pneumatic column is installed at the center point of the lower end of the piston block, and the pneumatic column penetrates the cooperative sleeve downward;

[0006] The lower end of the valve body is provided with an interface end, the lower end of the pneumatic column is open, and a breathable gap is provided at the intersection of the pneumatic column and the cooperative sleeve, a primary air sheet and a secondary air sheet are installed on the inner wall position of the cooperative sleeve corresponding to the breathable gap, an air blocking ring group is installed on the outer wall position of the pneumatic column corresponding to the breathable gap, and an exhaust port is opened at the position of the valve body corresponding to the piston block;

[0007] An energized electromagnetic group is installed at the top position of the inner wall of the valve body, and a permanent magnet corresponding to the energized electromagnetic group is installed at the top position of the piston block.

[0008] It is further configured as follows: the first-level air sheet and the second-level air sheet are arranged in a circular array along the center point of the cooperative sleeve, and the first-level air sheet and the second-level air sheet are arranged in a staggered manner, and the air blocking ring group is provided with second-level air grooves and first-level air grooves corresponding to the first-level air sheet and the second-level air sheet.

[0009] It is further configured as follows: the lower end portion of the cross section of the cooperative sleeve is in an inverted slope, and the upper surface position of the cooperative sleeve is horizontal, and the valve body corresponds to the middle position of the piston block and the cooperative sleeve and is respectively installed with a limit ring and a directional ring along the direction from top to bottom.

[0010] It is further configured as follows: the limiting ring matches the setting position of the piston block, a connecting spring is installed on the lower surface of the directional ring, and the lower end of the connecting spring is installed on the upper surface of the cooperative sleeve.

[0011] It is further configured as follows: the upper surfaces of the first-level air sheet and the second-level air sheet are on the same horizontal plane as the upper surface of the cooperative sleeve, and the length of the first-level air sheet is greater than that of the second-level air sheet.

[0012] It is further configured as follows: the lower end of the secondary air groove is open, the upper end of the primary air groove is open, the width of the primary air sheet and the secondary air sheet is smaller than the width of the air permeable gap, and the thickness of the air blocking ring group is equal to the width of the air permeable gap.

[0013] It is further configured as follows: an intermediate air groove is opened in the middle section of the piston block, and a cooperative fan is rotatably installed at the position of the piston block corresponding to the intermediate air groove. The piston block is respectively provided with an upper part and a lower part along the direction from top to bottom with the intermediate air groove as a dividing line.

[0014] It is further configured as follows: a cooperative air pipe is installed on the outside of the valve body, the lower end of the cooperative air pipe is connected to the internal position of the lower side of the cooperative sleeve corresponding to the valve body, and the upper end of the cooperative air pipe is set at a position corresponding to the upper part, the number of exhaust ports is two, and the setting positions of the exhaust ports correspond to the upper part and the lower part in the piston block respectively.

[0015] The present invention has the following beneficial effects:

[0016] 1. The overall structure is improved and optimized based on the basic principle of the conventional air release valve. First, the repulsive force formed between the energized electromagnetic group and the permanent magnet is used as the prestress. Then, the air-permeable gap between the pneumatic column and the cooperative sleeve is used as the displacement channel during the gas flow process. In addition, the air-blocking ring group, the first-level air sheet and the second-level air sheet are respectively arranged on the pneumatic column and the cooperative sleeve. The pneumatic column is used as a direct force-bearing structure. During the high-pressure gas flow process, the cooperation process between the first-level air sheet and the second-level air groove, and the second-level air sheet and the first-level air groove is used to change the gas fluid caliber on the one hand, and to passively change the relative position of the cooperative sleeve on the other hand. Its essence is to form a gas pressure "slow speed" process to avoid the high-pressure gas discharge process increasing the workload of the piston block structure;

[0017] 2. Based on the above content, the overall device adds a cooperative air pipe for the setting position of the piston block and the pneumatic sleeve. The cooperative air pipe serves as a "passive channel" in the gas discharge process. Only during the high-pressure gas flow process, the piston block moves to the corresponding cooperative air pipe to form a secondary deflation action. Its essence lies in: in the two deflation processes, it is mainly used to "consume" the kinetic energy of the high-pressure gas, so that the overall discharge process remains in a relatively stable state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a structural schematic diagram of a constant-pressure air release valve for an electric submersible pump well casing with a process operation stabilization function proposed by the present invention;

[0020] Figure 2 The invention provides a constant pressure venting valve for electric submersible pump casing with a process operation stabilization function. Figure 1 sectional view of

[0021] Figure 3 The invention provides a constant pressure venting valve for electric submersible pump casing with a process operation stabilization function. Figure 1 A cross-sectional view of

[0022] Figure 4 The invention provides a constant pressure venting valve for electric submersible pump casing with a process operation stabilization function. Figure 2 Split diagram of ;

[0023] Figure 5 A cross-sectional view of a pneumatic column and a cooperating sleeve in a constant-pressure air release valve for an electric submersible pump well casing with a process operation stabilization function proposed by the present invention;

[0024] Figure 6 This is a partial cross-sectional view of the cooperative sleeve in the constant pressure air release valve for the casing of the electric submersible pump well with the process operation stabilization function proposed by the present invention.

[0025] In the figure: 1. valve body; 2. exhaust port; 3. controller; 4. cooperative air pipe; 5. piston block; 6. cooperative fan; 7. limit ring; 8. directional ring; 9. cooperative sleeve; 901. primary air piece; 902. secondary air piece; 10. pneumatic column; 11. energized electromagnetic group; 12. permanent magnet; 13. connecting spring; 14. air blocking ring group; 1401. primary air groove; 1402. secondary air groove; 15. intermediate air groove. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1: The air release valve used in the electric submersible pump is described. Because the downhole pressure environment is relatively complex, specifically, the downhole pressure environment, such as instantaneous high pressure and pressure "sometimes high and sometimes low", produces mechanical fatigue in the spring structure or rubber structure, resulting in operating loss of the air limiting structure in the conventional air release valve, and the preset upper pressure limit has deviations. The following technical solutions are proposed:

[0028] Reference Figure 1 to Figure 6 The constant pressure air release valve for casing of an electric submersible pump well with a process operation stabilization function in this embodiment comprises a valve body 1 and a controller 3. A piston block 5 and an auxiliary sleeve 9 are slidably installed in the valve body 1 from top to bottom, and a pneumatic column 10 is installed at the center point of the lower end of the piston block 5. The pneumatic column 10 penetrates the auxiliary sleeve 9 downward;

[0029] The lower end of the valve body 1 is provided with an interface end, the lower end of the pneumatic column 10 is open, and a breathable gap is provided at the intersection of the pneumatic column 10 and the cooperative sleeve 9, and a first-level air sheet 901 and a second-level air sheet 902 are installed on the inner wall position of the cooperative sleeve 9 corresponding to the breathable gap, and a gas blocking ring group 14 is installed on the outer wall position of the pneumatic column 10 corresponding to the breathable gap, and an exhaust port 2 is opened at the position of the valve body 1 corresponding to the piston block 5;

[0030] An energized electromagnetic group 11 is installed at the top position of the inner wall of the valve body 1, and a permanent magnet 12 corresponding to the energized electromagnetic group 11 is installed at the top position of the piston block 5. The first-level air piece 901 and the second-level air piece 902 are arranged in a circular array along the center point of the cooperative sleeve 9, and the first-level air piece 901 and the second-level air piece 902 are staggered. The air blocking ring group 14 is provided with a second-level air groove 1402 and a first-level air groove 1401 corresponding to the first-level air piece 901 and the second-level air piece 902. The limit ring 7 matches the setting position of the piston block 5. A connecting spring 13 is installed on the lower surface of the directional ring 8, and the lower end of the connecting spring 13 is installed on the upper surface of the cooperative sleeve 9.

[0031] Working principle: The basic principle of the air release valve structure in the present invention is basically the same as that of the conventional air release valve, that is, the gas discharge process is performed after the gas pressure is greater than the preset value. However, the difference between this embodiment and the conventional air release valve is that the energized electromagnetic group 11 in the energized state forms a repulsive force with the permanent magnet 12, thereby prompting the piston block 5 to move downward, and the limit ring 7 is used to limit the maximum distance of the piston block 5 moving downward, which will not be described in detail here. In the intake process, Figure 3 As shown, the gas enters the interior of the valve body 1 along the lower end of the valve body 1, but the upper end of the pneumatic column 10 in the present invention is closed, so the pneumatic column 10 does not have the ability to circulate gas, but only serves as a structure to withstand gas pressure, and then a breathable gap is formed between the pneumatic column 10 and the cooperative sleeve 9. The breathable gap serves as the only channel in the gas circulation process. Its essence is that the outer diameter of the pneumatic column 10 is smaller than the inner diameter of the cooperative sleeve 9. As the gas continues to enter the interior of the valve body 1, the piston block 5 and the pneumatic column 10 generate upward pressure until the pressure is greater than the repulsive force, thereby exposing the exhaust port 2 for gas discharge.

[0032] Embodiment 2: This embodiment explains the gas flow process in Embodiment 1:

[0033] The lower end portion of the cross-section of the cooperative sleeve 9 is in an inverted slope, and the upper surface of the cooperative sleeve 9 is horizontal. The valve body 1 corresponds to the middle position of the piston block 5 and the cooperative sleeve 9 and is respectively installed with a limit ring 7 and a directional ring 8 along the direction from top to bottom. The upper surfaces of the first-level air sheet 901 and the second-level air sheet 902 are on the same horizontal plane as the upper surface of the cooperative sleeve 9, and the length of the first-level air sheet 901 is greater than the length of the second-level air sheet 902. The lower end of the second-level air groove 1402 is open, and the upper end of the first-level air groove 1401 is open. The width of the first-level air sheet 901 and the second-level air sheet 902 is less than the width of the air permeable gap, and the thickness of the air blocking ring group 14 is equal to the width of the air permeable gap.

[0034] The scenario description is as follows:

[0035] S1: Refer to 5 and Figure 6, the connecting spring 13 on the directional ring 8 causes the cooperative sleeve 9 to slide downward to the initial position. In the initial position, the upper end of the first-level air sheet 901 is just aligned with the top position inside the second-level air groove 1402, and the top horizontal plane inside the second-level air groove 1402 is lower than the upper surface of the cooperative sleeve 9, while the lower end of the second-level air sheet 902 is higher than the bottom position inside the first-level air groove 1401. Therefore, after the gas enters the valve body 1, it is mainly concentrated in the pneumatic column 10 and the second-level air groove 1402. The gas will not directly enter the valve body 1 corresponding to the upper position of the cooperative sleeve 9, so that the pneumatic column 10 is subjected to the gas pressure;

[0036] S2: When the gas pressure on the pneumatic column 10 is greater than the repulsive force, it moves upward, so that the top position inside the secondary gas groove 1402 is "slowly" higher than the upper surface of the cooperative sleeve 9, and then the pressure on the pneumatic column 10 is reduced and the piston block 5 "shares the pressure", but the piston block 5 and the pneumatic column 10 remain in a fixed state, so that the piston block 5 moves upward when the gas pressure increases;

[0037] S3: Combined with S2, as the gas pressure continues to rise, the caliber of the "exposed" upper surface of the secondary gas groove 1402 corresponding to the cooperative sleeve 9 continues to increase. According to the principle of gas flow, under the condition of constant pressure, when the caliber increases, the gas flow rate decreases, so that the primary gas sheet 901 corresponds to the secondary gas groove 1402 to form a "slow speed" process of high-pressure gas, which is manifested as: when the downhole gas pressure increases instantly, on the one hand, the kinetic energy in the gas flow process is converted into the kinetic energy of the pneumatic column 10 moving upward, and the "movement amplitude" of the pneumatic column 10 driving the piston block 5 to move upward is slowed down by reducing the gas flow rate;

[0038] S4: Combined with S3 again, Figure 5 For example, since the lower side of the first-level air groove 1401 is in a closed state, the secondary air sheet 902 and the first-level air groove 1401 will not affect the gas flow. However, as the pneumatic column 10 continues to move upward, when the lower end of the first-level air groove 1401 contacts the lower end of the secondary air sheet 902, the pneumatic column 10 can synchronously drive the cooperative sleeve 9 to move upward, which is further converted into kinetic energy during the upward movement of the cooperative sleeve 9, compressing the connecting spring 13, so that the high-pressure gas will also indirectly form "elastic potential energy".

[0039] In combination with the above S1 to S4, the purpose of this embodiment is to reduce the workload of the piston block 5 and other structures caused by the high pressure by using multiple conversion processes when encountering high pressure gas.

[0040] Embodiment 3: This embodiment is a supplementary explanation of Embodiment 1 and Embodiment 2, and is specifically based on the improvement of the piston block structure, as follows:

[0041] An intermediate air groove 15 is opened in the middle position of the piston block 5, and a cooperative fan 6 is rotatably installed at the position of the piston block 5 corresponding to the intermediate air groove 15. The piston block 5 is respectively provided with an upper part and a lower part along the direction from top to bottom with the intermediate air groove 15 as a dividing line. A cooperative air pipe 4 is installed on the outside of the valve body 1. The lower end of the cooperative air pipe 4 is connected with the internal position of the lower side of the cooperative sleeve 9 corresponding to the valve body 1, and the upper end of the cooperative air pipe 4 is set at a position corresponding to the upper part. There are two exhaust ports 2, and the setting positions of the exhaust ports 2 correspond to the upper part and the lower part in the piston block 5 respectively.

[0042] Solution Description: Refer to Figure 3 and Figure 4 To illustrate, and in combination with the second embodiment, when the gas enters the valve body 1, it is also injected into the cooperative air pipe 4 simultaneously, but in the initial state, the upper end position of the cooperative air pipe 4 corresponds to the upper part of the piston block 5, so that the cooperative air pipe 4 is essentially in a closed state;

[0043] As described in Example 2, as the exhaust port 2 is exposed as the piston block 5 moves upward, only the exhaust port 2 located at the lower side is in the exhaust state, that is, the exhaust port corresponding to the lower part of the piston block 5. However, when encountering high-pressure gas, the piston block 5 moves up by a large "amplitude", and the exhaust port corresponding to the lower part of the piston block 5 opens quickly, and the following actions occur: the upper end of the cooperative air pipe 4 is connected to the middle air groove 15, and the high-pressure gas can drive the cooperative fan 6 to rotate at a constant speed, which will be further converted into the kinetic energy of the cooperative fan 6. However, the key is: when the exhaust port 2 corresponding to the lower part is in an open state, the exhaust port 2 corresponding to the upper part will also be in an open state, thereby further realizing a large-caliber exhaust process, which is mainly used to reduce the "work burden" of the gas pressure on the piston block 5 during the movement process, so that the overall structure operation remains relatively stable.

[0044] In summary: based on the basic principle of the air release valve, improvements and optimizations are made, with repulsive force as prestress and air-permeable gap as the only channel in the exhaust process. Specifically, a first-level air sheet, a second-level air sheet and an air-blocking ring group are set according to the position of the air-permeable gap, and the pneumatic column is driven to move upward as the gas pressure rises. In the upward process, a gas pressure "slowing down" process is formed between the first-level air sheet and the second-level air groove, and between the second-level air sheet and the first-level air groove. In addition, based on the improvement of the piston block, an intermediate air groove and a cooperative air pipe are obtained, which are used in the high-pressure gas discharge process to form a secondary air release action. Its essence is: in the high-pressure gas discharge process, the gas pressure "slowing down" process is used to reduce the movement amplitude of the piston block, so as to avoid the high-pressure gas discharge process increasing the workload of the piston block during the movement process, and keep the gas discharge process relatively stable.

[0045] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A constant pressure air release valve for casing of an electric submersible pump well with a process operation stabilization function, comprising a valve body (1) and a controller (3), characterized in that: A piston block (5) and an auxiliary sleeve (9) are slidably mounted in the valve body (1) from top to bottom, respectively; a pneumatic column (10) is mounted at the center point of the lower end of the piston block (5); and the pneumatic column (10) penetrates downward through the auxiliary sleeve (9); The valve body (1) is provided with an interface end at the lower end, the pneumatic column (10) is open at the lower end, and a breathable gap is provided at the intersection of the pneumatic column (10) and the cooperative sleeve (9), a first-stage air sheet (901) and a second-stage air sheet (902) are installed on the inner wall of the cooperative sleeve (9) corresponding to the breathable gap, a gas blocking ring group (14) is installed on the outer wall of the pneumatic column (10) corresponding to the breathable gap, and an exhaust port (2) is provided at a position of the valve body (1) corresponding to the piston block (5); An energized electromagnetic group (11) is installed at the top position of the inner wall of the valve body (1), and a permanent magnet (12) corresponding to the energized electromagnetic group (11) is installed at the top position of the piston block (5). The first-level air sheet (901) and the second-level air sheet (902) are arranged in a circular array along the center point of the cooperative sleeve (9), and the first-level air sheet (901) and the second-level air sheet (902) are arranged in a staggered manner. The air blocking ring group (14) is provided with a second-level air groove (1402) and a first-level air groove (1401) corresponding to the first-level air sheet (901) and the second-level air sheet (902). The upper surfaces of the first-level air sheet (901) and the second-level air sheet (902) are on the same horizontal plane as the upper surface of the cooperative sleeve (9), and the length of the first-level air sheet (901) is greater than the length of the second-level air sheet (902).

2. The constant pressure air release valve for casing of an electric submersible pump well with a process operation stabilization function according to claim 1 is characterized in that: The lower end portion of the cross section of the cooperative sleeve (9) is in the shape of an inverted slope, and the upper surface of the cooperative sleeve (9) is in a horizontal position. The valve body (1) is respectively provided with a limit ring (7) and a directional ring (8) in a direction from top to bottom at a middle position corresponding to the piston block (5) and the cooperative sleeve (9).

3. The constant pressure air release valve for casing of an electric submersible pump well with a process operation stabilization function according to claim 2 is characterized in that: The position of the limiting ring (7) matches the setting position of the piston block (5), and a connecting spring (13) is installed on the lower surface of the directional ring (8), and the lower end of the connecting spring (13) is installed on the upper surface of the cooperative sleeve (9).

4. The constant pressure air release valve for casing of an electric submersible pump well with a process operation stabilization function according to claim 1, characterized in that: The lower end of the secondary air groove (1402) is open, and the upper end of the primary air groove (1401) is open. The widths of the primary air sheet (901) and the secondary air sheet (902) are smaller than the width of the air permeable gap, and the thickness of the air blocking ring group (14) is equal to the width of the air permeable gap.

5. The constant pressure air release valve for casing of an electric submersible pump well with a process operation stabilization function according to claim 1, characterized in that: An intermediate air groove (15) is provided in the middle section of the piston block (5), and a cooperative fan (6) is rotatably mounted on the piston block (5) at a position corresponding to the intermediate air groove (15). The piston block (5) is provided with an upper portion and a lower portion respectively along a direction from top to bottom with the intermediate air groove (15) as a dividing line.

6. The constant pressure air release valve for casing of an electric submersible pump well with a process operation stabilization function according to claim 1, characterized in that: The valve body (1) is externally provided with an assisted air pipe (4), the lower end of the assisted air pipe (4) being connected to the lower internal position of the assisted sleeve (9) corresponding to the valve body (1), and the upper end of the assisted air pipe (4) being arranged at a position corresponding to the upper portion, the exhaust ports (2) being arranged in two numbers, and the arrangement positions of the exhaust ports (2) respectively corresponding to the upper portion and the lower portion of the piston block (5).

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