High-pressure alcohol injection one-way valve

Abstract

The high-pressure alcohol injection one-way valve comprises a valve deck, a valve seat, a valve element, a valve sleeve and an elastic component, the valve deck is provided with a first containing cavity, the valve seat is provided with a second containing cavity, the valve element is arranged in the second containing cavity of the valve seat, the valve element is provided with a sealing groove and a sealing component, the sealing groove is formed in the circumferential direction of the valve element, and the sealing component is arranged in the sealing groove; the valve sleeve is provided with a third containing cavity, one end of the valve sleeve is in sealed connection with the valve cover, the other end of the valve sleeve is in sealed connection with the valve seat, the elastic component is arranged in the first containing cavity and the second containing cavity, one end of the elastic component abuts against the valve cover, the other end of the elastic component abuts against the valve element, and the elastic component can drive the valve element to move so that the valve element can reset. And the fault rate of the high-pressure alcohol injection one-way valve is reduced from 82% to 2%. The problem that a pipeline is frozen and blocked in injection and production operation is solved, the maintenance frequency of the alcohol injection pump is greatly reduced, a rigid-flexible combined sealing mode is achieved, the influence of impurities is reduced, and the requirement for gas quality is greatly lowered.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas storage and transportation engineering, and more particularly, to a high-pressure methanol injection check valve. Background Art

[0002] Because the single-well gas production temperature field has not been established in the initial stage of gas production at the well site, when the wellhead temperature is 40°C, the temperature after throttling and cooling reaches -10°C. Low pipeline transportation temperature will cause pipeline blockage by freezing, so the methanol injection pump is used for anti-freezing measures. However, during the methanol injection process, the phenomenon that the methanol injection pump fails to deliver the required volume often occurs. With the increase of the gas production cycle and the number of production gas wells, pipeline blockage by freezing leads to gas production obstruction, increasing the maintenance workload and significantly increasing the maintenance cost, seriously affecting the gas production task and natural gas supply guarantee.

[0003] In order to increase the sealing area, linear contact sealing is adopted. When the valve core of the check valve in the prior art moves relative to the valve seat to close, large particles of impurities cannot contact the sealing surface, and solid particles will not remain in the linear contact part. Thus, the sealing valve can be evenly closed during the suction and discharge processes, ensuring the normal decrease of the internal volume pressure at the hydraulic end, avoiding the connection between high and low pressures, preventing impurities from entering the methanol injection pump, and avoiding the pump blockage phenomenon. However, for gas storage reservoirs with high system pressure (≥40 MPa), the material of the check valve and the sealing methods of the valve seat and valve core in the prior art cannot guarantee the use efficiency and durability, greatly increasing the replacement frequency. Summary of the Invention

[0004] The present invention provides a high-pressure methanol injection check valve, which solves the problem of pipeline blockage by freezing during injection and production operations and reduces the maintenance times of the methanol injection pump.

[0005] In view of this, the present invention proposes a high-pressure methanol injection check valve, including: a valve cover provided with a first accommodation cavity; a valve seat provided with a second accommodation cavity, the second accommodation cavity penetrating through the valve seat; a valve core disposed in the second accommodation cavity of the valve seat, the valve core being provided with a sealing groove and a sealing member, the sealing groove being disposed along the circumferential direction of the valve core, and the sealing member being disposed in the sealing groove; a valve sleeve provided with a third accommodation cavity, the third accommodation cavity penetrating through the valve sleeve, one end being hermetically connected to the valve cover and the other end being hermetically connected to the valve seat; an elastic member disposed in the first accommodation cavity and the second accommodation cavity, one end of the elastic member pressing against the valve cover and the other end pressing against the valve core.

[0006] In some alternative embodiments, it further includes a first sealing gasket, and a first sealing gasket is disposed between the valve sleeve and the valve cover.

[0007] In some alternative embodiments, a first groove is disposed at the end of the valve sleeve connected to the valve cover, the first groove being disposed along the circumferential direction of the third accommodation cavity, and the first sealing gasket is disposed in the first groove.

[0008] In some alternative embodiments, a second gasket is further included, and the second gasket is disposed between the valve sleeve and the valve cover.

[0009] In some alternative embodiments, a second groove is provided at an end of the valve sleeve connected to the valve seat, the second groove is provided along the circumference of the third accommodation cavity, and the second gasket is disposed in the second groove.

[0010] In some alternative embodiments, the elastic member is a spring.

[0011] In some alternative embodiments, the valve core is a conical valve core.

[0012] In some alternative embodiments, a third sealing ring is further included, a sealing groove is provided on the valve core, and the third sealing ring is disposed in the sealing groove.

[0013] In some alternative embodiments, the sealing member is a 45° chamfered poly-pressure sealing ring, and the material of the sealing member is stainless steel.

[0014] In some alternative embodiments, the cross-sectional shape of the sealing member is triangular.

[0015] In some alternative embodiments, the valve seat encloses a frustum-shaped accommodation cavity through a frustum-shaped side surface, the frustum-shaped accommodation cavity is part of the third accommodation cavity, and the third sealing ring is attached to the frustum-shaped side surface.

[0016] The present invention has the following technical effects compared with the prior art:

[0017] The present invention provides a high-pressure methanol injection check valve, which includes: a valve cover, a valve seat, a valve core, a valve sleeve and an elastic member. The valve cover is provided with a first accommodation cavity, the valve seat is provided with a second accommodation cavity, the valve core is disposed in the second accommodation cavity of the valve seat, the valve core is provided with a sealing groove and a sealing member, the sealing groove is provided along the circumference of the valve core, the sealing member is disposed in the sealing groove, the valve sleeve is provided with a third accommodation cavity, one end of the valve sleeve is hermetically connected to the valve cover, the other end of the valve sleeve is hermetically connected to the valve seat, the sealing area is increased, the sealing performance is optimized, the elastic member is disposed in the first accommodation cavity and the second accommodation cavity, one end of the elastic member presses against the valve cover, the other end of the elastic member presses against the valve core, the elastic member can drive the valve core to move, so that the valve core can be reset, and the failure rate of the high-pressure methanol injection check valve is reduced from 82% to 2%. It solves the problem of pipeline freezing and blockage during injection and production operations, greatly reduces the maintenance times of the methanol injection pump, realizes a sealing method combining rigidity and flexibility, reduces the influence of impurities, and greatly reduces the requirement for gas quality. Description of the Drawings

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0019] Figure 1 Schematic structural diagram of a high-pressure methanol injection check valve provided by an embodiment of the present invention;

[0020] Figure 2 is Figure 1 Schematic exploded view of the high-pressure methanol injection check valve of the provided embodiment.

[0021] Wherein, Figures 1 to 2 The corresponding relationship between the reference numerals and component names in the

[0022] 1-valve cover; 11-liquid outlet hole; 12-first accommodation cavity; 2-valve seat; 21-truncated cone-shaped accommodation cavity; 3-valve core; 31-sealing groove; 4-valve sleeve; 41-third accommodation cavity; 42-first groove; 43-second groove; 5-elastic member; 6-first sealing gasket; 7-second sealing gasket; 8-sealing member. Detailed implementation manners

[0023] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0024] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0025] Because the single-well gas production temperature field has not been established at the initial stage of gas production in the well site. When the wellhead temperature is 40°C, the temperature reaches -10°C after throttling and cooling. The low pipeline transportation temperature will cause the pipeline to freeze and block. Therefore, the methanol injection pump is used to inject methanol for anti-freezing measures. However, during the methanol injection process, the phenomenon that the methanol injection pump fails to deliver volume often occurs. With the increase of the gas production cycle and the number of production gas wells, the pipeline freeze and block lead to gas production obstruction, increasing the maintenance workload and significantly increasing the maintenance cost, seriously affecting the gas production task and natural gas supply guarantee.

[0026] In order to increase the sealing area, linear contact sealing is adopted. When the spool of the check valve in the prior art moves relative to the valve seat to close, large particles of impurities cannot contact the sealing surface, and no solid particles will remain in the linear contact part. Thus, during the suction and discharge process, the sealing valve can be evenly closed, ensuring a normal decrease in the internal volume pressure of the fluid end, avoiding high and low pressure connection, preventing impurities from entering the methanol injection pump, and avoiding pump blockage. However, for gas storage reservoirs with high system pressure (≥40 MPa), the material of the check valve and the sealing methods of the valve seat and spool in the prior art cannot guarantee the service efficiency and durability, greatly increasing the replacement frequency.

[0027] The present invention provides a high-pressure methanol injection check valve, which includes: a valve cover 1 provided with a first accommodation cavity 12; a valve seat 2 provided with a second accommodation cavity, and the second accommodation cavity penetrates through the valve seat 2; a spool 3 disposed in the second accommodation cavity of the valve seat 2, the spool 3 is provided with a sealing groove 31 and a sealing component 8, the sealing groove 31 is arranged along the circumferential direction of the spool 3, and the sealing component 8 is disposed in the sealing groove 31; a valve sleeve 4 provided with a third accommodation cavity 41, the third accommodation cavity 41 penetrates through the valve sleeve 4, one end is hermetically connected to the valve cover 1, and the other end is hermetically connected to the valve seat 2; an elastic component 5 disposed in the first accommodation cavity 12 and the second accommodation cavity, one end of the elastic component 5 presses against the valve cover 1, and the other end presses against the spool 3.

[0028] Specifically, the valve cover 1 is provided with a liquid outlet hole 11 and a first accommodation cavity 12, the liquid outlet hole 11 is communicated with the first accommodation cavity 12, and the first accommodation cavity 12 is recessed from the lower surface to the upper surface. The high-pressure methanol injection check valve includes: a valve cover 1, a valve seat 2, a spool 3, a valve sleeve 4 and an elastic component 5. The valve cover 1 is provided with a first accommodation cavity 12, the valve seat 2 is provided with a second accommodation cavity, the spool 3 is disposed in the second accommodation cavity of the valve seat 2, the spool 3 is provided with a sealing groove 31 and a sealing component 8, the sealing groove 31 is arranged along the circumferential direction of the spool 3, the sealing component 8 is disposed in the sealing groove 31, the valve sleeve 4 is provided with a third accommodation cavity 41, one end of the valve sleeve 4 is hermetically connected to the valve cover 1, and the other end of the valve sleeve 4 is hermetically connected to the valve seat 2, increasing the sealing area and optimizing the sealing performance. The elastic component 5 is disposed in the first accommodation cavity 12 and the second accommodation cavity, one end of the elastic component 5 presses against the valve cover 1, and the other end of the elastic component 5 presses against the spool 3. The elastic component 5 can drive the spool 3 to move, enabling the spool 3 to reset, reducing the failure rate of the high-pressure methanol injection check valve from 82% to 2%. It solves the problem of pipeline freezing and blockage during injection and production operations, greatly reducing the maintenance times of the methanol injection pump, realizing a sealing method combining rigidity and flexibility, reducing the influence of impurities, and greatly reducing the requirement for gas quality.

[0029] In some alternative embodiments, the high-pressure methanol injection check valve further includes a first sealing gasket 6, and the first sealing gasket 6 is disposed between the valve sleeve 4 and the valve cover 1.

[0030] Specifically, the first gasket 6 is made of rubber and is disposed between the valve sleeve 4 and the valve cover 1, so that the valve sleeve 4 and the valve cover 1 have better sealing performance.

[0031] In some alternative embodiments, a first groove 42 is provided at the end of the valve sleeve 4 connected to the valve cover 1. The first groove 42 is arranged along the circumference of the third receiving cavity 41, and the first gasket 6 is disposed in the first groove 42.

[0032] Specifically, the first groove 42 communicates with the third receiving cavity 41. The first gasket 6 is disposed in the first groove 42, so that the valve sleeve 4 and the valve cover 1 have better sealing performance. The third receiving cavity 41 penetrates through the valve sleeve 4 and is used to accommodate the elastic member 5.

[0033] In some alternative embodiments, the high-pressure methanol injection check valve further includes a second gasket 7, and the second gasket 7 is disposed between the valve sleeve 4 and the valve seat 2.

[0034] Specifically, the second gasket 7 is made of rubber and is disposed between the valve sleeve 4 and the valve seat 2, so that the valve sleeve 4 and the valve seat 2 have better sealing performance.

[0035] In some alternative embodiments, a second groove 43 is provided at the end of the valve sleeve 4 connected to the valve seat 2. The second groove 43 is arranged along the circumference of the third receiving cavity 41, and the second gasket 7 is disposed in the second groove 43.

[0036] Specifically, the second groove 43 communicates with the third receiving cavity 41. The second gasket 7 is disposed in the second groove 43, so that the valve sleeve 4 and the valve seat 2 have better sealing performance. The third receiving cavity 41 penetrates through the valve sleeve 4 and is used to accommodate the elastic member 5.

[0037] In some alternative embodiments, the elastic member 5 is a spring.

[0038] In some alternative embodiments, the valve core 3 is a conical valve core.

[0039] Specifically, the original spherical valve core and valve seat are changed to a conical valve core cooperating with the valve seat 2. The valve seat 2 is provided with a frustum-shaped side surface. The conical valve core can cooperate with the valve seat 2. The original valve ball that freely falls by gravity is changed to a conical valve core that is directionally reset by the elastic member 5. A 45-degree chamfered conical pressure-resistant sealing ring is adopted to increase the sealing area, optimize the sealing performance, realize a sealing method combining rigidity and flexibility, reduce the influence of impurities, and greatly reduce the requirement for gas quality.

[0040] In some alternative embodiments, the sealing member 8 is a 45° chamfered conical pressure-resistant sealing ring.

[0041] Further, the original valve ball is changed to a conical valve core with a 45° chamfered pressure - concentrating sealing ring and valve guide. The 45° chamfered pressure - concentrating sealing ring is made of stainless steel type 2Cr13. An insulating material is coated on the upper part of the conical valve core, so that the 45° chamfered pressure - concentrating sealing ring can resist acids and alkalis, and the 45° chamfered pressure - concentrating sealing ring can withstand a pressure of 50 Mpa.

[0042] In some alternative embodiments, the valve seat 2 encloses a frustum - shaped accommodation cavity 21 through its own frustum - shaped side surface. The frustum - shaped accommodation cavity 21 is part of the third accommodation cavity 41, and the third sealing ring 8 fits with the frustum - shaped side surface.

[0043] Specifically, the original spherical valve core valve seat is changed to a combination of a conical valve core and a conical valve seat. The original valve ball that relies on gravity to free - fall is changed to a conical valve core with an elastic component 5 for directional reset. A conical 45 - degree chamfered pressure - concentrating sealing ring is adopted to increase the sealing area, optimize the sealing performance, realize a sealing method combining rigidity and flexibility, reduce the influence of impurities, and greatly reduce the requirement for gas quality. The failure rate of the high - pressure methanol pump check valve is reduced from 82% to 2%. It solves the problem of pipeline freezing and blockage during injection and production operations, and greatly reduces the maintenance times of the methanol injection pump.

[0044] When in use, the liquid enters from the third accommodation cavity 41, and the liquid pushes the valve core, causing the valve core to move towards the direction of the valve cover. The liquid enters the second accommodation cavity, and then enters the first accommodation cavity 12 and the liquid outlet hole 11, thereby realizing the one - way control of the liquid.

[0045] In the present invention, the term "a plurality of" refers to at least two or more than two, unless otherwise clearly defined. Terms such as "installed", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the present invention can be understood according to specific situations.

[0046] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above - mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-pressure methanol injection check valve, characterized in that, it includes: a valve cover (1) provided with a first accommodation cavity (12); a valve seat (2) provided with a second accommodation cavity, and the second accommodation cavity penetrates through the valve seat (2); a valve core (3) disposed in the second accommodation cavity of the valve seat (2), the valve core (3) is provided with a sealing groove (31) and a sealing member (8), the sealing groove (31) is arranged along the circumferential direction of the valve core (3), and the sealing member (8) is disposed in the sealing groove (31); a valve sleeve (4) provided with a third accommodation cavity (41), the third accommodation cavity (41) penetrates through the valve sleeve (4), one end is sealingly connected to the valve cover (1), and the other end is sealingly connected to the valve seat (2); an elastic member (5) disposed in the first accommodation cavity (12) and the second accommodation cavity, one end of the elastic member (5) presses against the valve cover (1), and the other end presses against the valve core (3).

2. The high-pressure methanol injection check valve according to claim 1, characterized in that, it further includes a first gasket (6), and a first gasket (6) is disposed between the valve sleeve (4) and the valve cover (1).

3. The high-pressure methanol injection check valve according to claim 2, characterized in that, a first groove (42) is provided at the end of the valve sleeve (4) connected to the valve cover (1), the first groove (42) is arranged along the circumferential direction of the third accommodation cavity (41), and the first gasket (6) is disposed in the first groove (42).

4. The high-pressure methanol injection check valve according to claim 1, characterized in that, it further includes a second gasket (7), and a second gasket (7) is disposed between the valve sleeve (4) and the valve seat (2).

5. The high-pressure methanol injection check valve according to claim 4, characterized in that, a second groove (43) is provided at the end of the valve sleeve (4) connected to the valve seat (2), the second groove (43) is arranged along the circumferential direction of the third accommodation cavity (41), and the second gasket (7) is disposed in the second groove (43).

6. The high-pressure methanol injection check valve according to claim 1, characterized in that, the elastic member (5) is a spring.

7. The high-pressure methanol injection check valve according to claim 1, characterized in that, the valve core (3) is a conical valve core.

8. The high-pressure methanol injection check valve according to claim 7, characterized in that, the sealing member (8) is a 45° chamfered pressure-accumulating sealing ring, and the material of the sealing member (8) is stainless steel.

9. The high-pressure methanol injection check valve according to claim 8, characterized in that, the cross-sectional shape of the sealing member (8) is triangular.

10. The high-pressure methanol injection check valve according to claim 9, characterized in that, the valve seat (2) forms a frustum-shaped accommodation cavity (21) by enclosing its own frustum-shaped side surface, the frustum-shaped accommodation cavity (21) is part of the third accommodation cavity, and the third sealing ring (8) fits with the frustum-shaped side surface.

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