阅读说明：本技术 单流阀 (Check valve ) 是由 王柳斌 张勇 张鹏 阿力亚哈·阿斯力拜克 刘海龙 朱万雨 赵云峰 李德龙 努尔买买提 于 2019-01-15 设计创作，主要内容包括：本发明提供了一种单流阀,包括：筒状本体,具有相对设置的第一开口和第二开口以及连通第一开口和第二开口的第一过流通道；密封套,设置在第一过流通道中,密封套具有相对设置的第三开口和第四开口以及连通第三开口和第四开口的第二过流通道；连接套,包括套筒、阀板和驱动件,套筒设置在第一过流通道中,套筒具有连通第一开口和第三开口的第三过流通道,阀板可翻转地设置在套筒上,阀板具有盖设在第三开口处的关闭位置以及避让第三开口的开启位置,驱动件设置在套筒和阀板之间,在驱动件的作用下,阀板始终产生向关闭位置运动的趋势。本发明的技术方案有效地解决了现有技术中气体或液体逆流的问题。(The present invention provides a check valve comprising: the cylindrical body is provided with a first opening, a second opening and a first flow passage, wherein the first opening and the second opening are oppositely arranged, and the first flow passage is communicated with the first opening and the second opening; the sealing sleeve is arranged in the first overflowing channel and is provided with a third opening, a fourth opening and a second overflowing channel, wherein the third opening and the fourth opening are oppositely arranged, and the second overflowing channel is communicated with the third opening and the fourth opening; the connecting sleeve comprises a sleeve, a valve plate and a driving piece, the sleeve is arranged in the first overflowing channel, the sleeve is provided with a third overflowing channel communicated with the first opening and the third opening, the valve plate can be arranged on the sleeve in a turnover mode, the valve plate is provided with a closing position covered at the third opening and an opening position avoiding the third opening, the driving piece is arranged between the sleeve and the valve plate, and under the action of the driving piece, the valve plate always tends to move towards the closing position. The technical scheme of the invention effectively solves the problem of gas or liquid countercurrent in the prior art.)

1. A check valve, comprising:

the device comprises a cylindrical body (10) and a first flow passage, wherein the cylindrical body is provided with a first opening (11) and a second opening (12) which are oppositely arranged, and the first flow passage is communicated with the first opening (11) and the second opening (12);

the sealing sleeve (20) is arranged in the first overflowing channel, and the sealing sleeve (20) is provided with a third opening (21) and a fourth opening (22) which are arranged oppositely, and a second overflowing channel (23) which is communicated with the third opening (21) and the fourth opening (22);

connecting sleeve (30), including sleeve (31), valve plate (32) and driving piece, sleeve (31) set up in the first passageway that overflows, sleeve (31) have the intercommunication first opening (11) with third opening (21) overflow passageway (33), valve plate (32) set up with overturning on sleeve (31), valve plate (32) have the lid and establish the closed position and dodge of third opening (21) department the open position of third opening (21), the driving piece sets up sleeve (31) with between valve plate (32) under the effect of driving piece, valve plate (32) produce all the time to the trend of closed position motion.

2. Check valve as in claim 1, characterized in that a relief hole (34) is provided on the sleeve (31), the valve plate (32) being able to be inserted in the relief hole (34) and in contact with the inner wall of the cylindrical body (10) in the case where the valve plate (32) leaves the third opening (21).

3. The check valve as claimed in claim 1, wherein the driving member is a torsion spring, one end of the valve plate (32) is pivotally connected to the sleeve (31) by a pin (36), and one end of the valve plate (32) away from the pin (36) is provided with an avoidance notch (35).

4. Check valve as claimed in claim 1, characterized in that the sealing sleeve (20) is provided with a first sealing ring (51) on its end face facing the first opening (11), the valve plate (32) being in contact with the first sealing ring (51) with the valve plate (32) in the closed position.

5. Check valve as claimed in claim 1, characterized in that the side of the sealing sleeve (20) close to the third opening (21) is provided with a step surface (24) to enable the sealing sleeve (20) to extend into the third transfer channel (33) and to enable the connecting sleeve (30) to abut against the step surface (24).

6. Check valve as claimed in claim 5, characterized in that a second sealing ring (52) is provided between the sealing sleeve (20) and the sleeve (31).

7. The check valve as claimed in claim 1, further comprising a plug (40), wherein the plug (40) is inserted into the second opening (12), the sealing sleeve (20) is disposed between the plug (40) and the connecting sleeve (30), and a connecting structure is disposed on a side of the plug (40) away from the first opening (11).

8. The check valve as claimed in claim 7, wherein the diameter of the second transfer channel (23) is smaller than the inner diameter of the plug (40).

9. The check valve as recited in claim 7, wherein the connection structure is a threaded structure.

10. The check valve as claimed in claim 1, wherein the first opening (11) is conical and arranged diverging outwardly from the center of the cylindrical body (10).

Technical Field

The invention relates to the field of oil exploitation, in particular to a check valve.

Background

With the decrease of the production capacity of various fields, various tertiary oil recovery methods are applied in large areas. The tertiary oil recovery mainly comprises four technical series, namely chemical flooding, gas flooding, thermal flooding and microbial flooding, wherein carbon dioxide flooding in the gas flooding technology is gradually used as a tertiary oil recovery mode which can reduce greenhouse gas emission and improve the oil field recovery ratio.

In the conventional oil displacement operation of the oil field, a ball body is required to be put into an oil production pipe to seat an oil extraction port of the oil production pipe, tools such as an oil displacement pipe and the like are put into the oil production pipe, and the put ball is continuously pushed downwards to connect the oil displacement pipe with the corresponding oil extraction port, so that oil displacement gas such as carbon dioxide and the like can be injected into an oil layer. The process of ball throwing and ball propelling is complex in operation, and in actual working face operation, the condition that the pressure of an oil layer is greater than the pressure of an oil displacement pipe to cause gas and liquid to flow back easily occurs.

Disclosure of Invention

The invention aims to provide a check valve to solve the problem of gas or liquid backflow in the prior art.

In order to achieve the above object, the present invention provides a check valve including: the cylindrical body is provided with a first opening, a second opening and a first flow passage, wherein the first opening and the second opening are oppositely arranged, and the first flow passage is communicated with the first opening and the second opening; the sealing sleeve is arranged in the first overflowing channel and is provided with a third opening, a fourth opening and a second overflowing channel, wherein the third opening and the fourth opening are oppositely arranged, and the second overflowing channel is communicated with the third opening and the fourth opening; the connecting sleeve comprises a sleeve, a valve plate and a driving piece, the sleeve is arranged in the first overflowing channel, the sleeve is provided with a third overflowing channel communicated with the first opening and the third opening, the valve plate can be arranged on the sleeve in a turnover mode, the valve plate is provided with a closing position covered at the third opening and an opening position avoiding the third opening, the driving piece is arranged between the sleeve and the valve plate, and under the action of the driving piece, the valve plate always tends to move towards the closing position.

Further, the sleeve is provided with an avoiding hole, and the valve plate can be embedded into the avoiding hole and is in contact with the inner wall of the cylindrical body under the condition that the valve plate is separated from the third opening.

Furthermore, the driving piece is a torsion spring, one end of the valve plate is pivotally connected to the sleeve through a pin shaft, and an avoiding notch is formed in one end, far away from the pin shaft, of the valve plate.

Further, a first sealing ring is arranged on the end face, facing the first opening, of the sealing sleeve, and the valve plate is in contact with the first sealing ring under the condition that the valve plate is in the closed position.

Furthermore, one side of the sealing sleeve, which is close to the third opening, is provided with a step surface so that the sealing sleeve can extend into the third overflowing channel and the connecting sleeve can be abutted against the step surface.

Further, a second sealing ring is arranged between the sealing sleeve and the sleeve.

Furthermore, the check valve further comprises a plug, the plug is arranged in the second opening in a penetrating mode, the sealing sleeve is arranged between the plug and the connecting sleeve, and a connecting structure is arranged on one side, far away from the first opening, of the plug.

Further, the diameter of the second flow passage is smaller than the inner diameter of the plug.

Further, the connecting structure is a threaded structure.

Further, the first opening is conical and is arranged to be gradually enlarged from the center of the cylindrical body to the outside.

By applying the technical scheme of the invention, in the process that the check valve enters the oil production pipe downwards, the pressure of oil gas acts on the valve plate upwards to enable the valve plate to be attached to the sealing sleeve, and the oil gas cannot flow out in a reverse manner through the first overflowing channel, so that sealing is realized. Under the condition that the check valve is lowered to the preset position, the pressure of carbon dioxide can be increased to enable the gas pressure above the valve plate to exceed the resultant force of the oil gas pressure below the valve plate and the driving force of the driving piece, and the valve plate is pushed to the opening position to inject the carbon dioxide gas into an oil layer to achieve oil displacement operation. By utilizing the check valve of the embodiment, the procedures of ball injection and the like can be omitted, the oil displacement operation procedure is simplified, meanwhile, the sealing property and the safety of a tubular column in the oil displacement operation are greatly improved, and the oil displacement operation cost is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic block diagram of an embodiment of a check valve according to the present invention in a closed state;

FIG. 2 is a schematic diagram illustrating the check valve of FIG. 1 in an intermediate state; and

fig. 3 is a schematic structural view illustrating the check valve of fig. 1 in an open state.

Wherein the figures include the following reference numerals:

10. a cylindrical body; 11. a first opening; 12. a second opening; 20. sealing sleeves; 21. a third opening; 22. a fourth opening; 23. a second flow passage; 24. a step surface; 30. connecting sleeves; 31. a sleeve; 32. a valve plate; 33. a third flow passage; 34. avoiding holes; 35. avoiding the notch; 36. a pin shaft; 40. a plug; 41. a threaded hole; 51. a first seal ring; 52. a second seal ring; 53. a third seal ring; 54. and a fourth seal ring.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 3, the check valve of the present embodiment includes a cylindrical body 10, a sealing sleeve 20, and a connecting sleeve 30. The tubular body 10 has a first opening 11 and a second opening 12 opposite to each other, and a first flow passage communicating the first opening 11 and the second opening 12, and the sealing sleeve 20 is disposed in the first flow passage. The sealing sleeve 20 has a third opening 21 and a fourth opening 22 which are oppositely arranged, and a second flow passage 23 which communicates the third opening 21 and the fourth opening 22. The connecting sleeve 30 comprises a sleeve 31, a valve plate 32 and a driving element, the sleeve 31 is arranged in the first overflowing passage, the sleeve 31 is provided with a third overflowing passage 33 communicated with the first opening 11 and the third opening 21, the valve plate 32 is arranged on the sleeve 31 in a reversible mode, the valve plate 32 is provided with a closing position covering the third opening 21 and an opening position avoiding the third opening 21, the driving element is arranged between the sleeve 31 and the valve plate 32, and under the action of the driving element, the valve plate 32 always tends to move towards the closing position.

Preferably, the first opening 11 is conical and disposed to be gradually enlarged outward from the center of the cylindrical body 10.

By applying the technical scheme of the embodiment, in the process that the check valve enters the oil production pipe downwards, the pressure of oil gas acts on the valve plate 32 upwards, so that the valve plate 32 is tightly attached to the sealing sleeve 20, and the oil gas cannot flow out through the first overflowing channel in a reverse flow manner, thereby realizing sealing. Under the condition that the check valve is lowered to the preset position, the pressure of carbon dioxide can be increased to enable the gas pressure above the valve plate 32 to exceed the resultant force of the oil gas pressure below and the driving force of the driving piece, and the valve plate 32 is pushed to the opening position to inject the carbon dioxide gas into an oil layer to achieve oil displacement operation. By utilizing the check valve of the embodiment, the procedures of ball injection and the like can be omitted, the oil displacement operation procedure is simplified, meanwhile, the sealing property and the safety of a tubular column in the oil displacement operation are greatly improved, and the oil displacement operation cost is reduced.

As shown in fig. 1, the sleeve 31 of the present embodiment is provided with the relief holes 34, and the contour of the relief holes 34 is set according to the turning track of the valve plate 32, so that the valve plate 32 can be inserted into the relief holes 34 and contact with the inner wall of the cylindrical body 10 at the fully opened position, thereby providing the maximum flow area for the displacement gas such as carbon dioxide.

In this embodiment, the driving member is a torsion spring, one end of the valve plate 32 is pivotally connected to the sleeve 31 through the pin shaft 36, one end of the valve plate 32, which is far away from the pin shaft, is provided with an avoiding notch 35, and the avoiding notch 35 effectively avoids scraping and interfering with the edge of the valve plate 32 and the avoiding hole 34.

As shown in fig. 1, the sealing sleeve 20 is provided with a step surface 24 on a side close to the third opening 21 so that the sealing sleeve 20 can extend into the third transfer passage 33 and the connecting sleeve 30 can abut against the step surface 24. The sealing sleeve 20 is in insertion fit with the connecting sleeve 30, so that the oil displacement gas enters the connecting sleeve 30 through the sealing sleeve 20, and the sealing performance of the check valve is improved. The circumferential outer wall of the sealing sleeve 20 is provided with a plurality of grooves at intervals, so that the sealing performance and the structural support performance of the sealing sleeve 20 are guaranteed, meanwhile, the material consumption of the sealing sleeve 20 is reduced, and the cost is reduced.

As shown in fig. 1, the check valve of this embodiment further includes a plug 40, the plug 40 is inserted into the second opening 12, and the sealing sleeve 20 is disposed between the plug 40 and the connecting sleeve 30, so that the structures in the cylindrical body 10 are tightly attached to each other, and the play between the sealing sleeve 20 and the connecting sleeve 30 in the cylindrical body 10 is reduced. One side of the plug 40 away from the first opening 11 is provided with a connecting structure, and the check valve can be connected with the existing oil production pipe through the connecting structure, so that the volume of the check valve is reduced, and the flexibility and the application range of the check valve are increased. Preferably, the connection structure is a threaded structure. Specifically, the diameter of the second flow channel 23 is smaller than the inner diameter of the plug 40.

A first sealing ring 51 is arranged on the end surface of the sealing sleeve 20 facing the first opening 11, when the valve plate 32 is in the closed position, a second sealing ring 52 is arranged between the valve plate 32 and the first sealing ring 51, the sealing sleeve 20 and the sleeve 31, a third sealing ring 53 is arranged between the sealing sleeve 20 and the cylindrical body 10, and a fourth sealing ring 54 is arranged between the plug 40 and the cylindrical body 10, so as to improve the sealing performance of the check valve.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

in the process that the check valve enters the oil production pipe downwards, the pressure of oil gas acts on the valve plate upwards to enable the valve plate to be attached to the sealing sleeve tightly, and the oil gas cannot flow out through the first overflowing channel in a reverse flow mode, so that sealing is achieved. Under the condition that the check valve is lowered to the preset position, the pressure of carbon dioxide can be increased to enable the gas pressure above the valve plate to exceed the resultant force of the oil gas pressure below the valve plate and the driving force of the driving piece, and the valve plate is pushed to the opening position to inject the carbon dioxide gas into an oil layer to achieve oil displacement operation. By utilizing the check valve of the embodiment, the procedures of ball injection and the like can be omitted, the oil displacement operation procedure is simplified, meanwhile, the sealing property and the safety of a tubular column in the oil displacement operation are greatly improved, and the oil displacement operation cost is reduced.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.