Impact type oil return prevention device

Abstract

The utility model discloses an impact type oil return prevention device which is applied between a standing valve and a pump cylinder of an oil well pump and comprises a valve body, the top of the valve body is connected to the bottom of the pump cylinder of the oil well pump, the bottom of the valve body is connected to the top of the standing valve of the oil well pump, a blocking cavity is formed in the top of the valve body, and an oil inlet cavity is formed in the bottom of the valve body. The bottom of the blocking cavity is connected with the top of the oil inlet cavity in a penetrating mode, a blocking mechanism is arranged between the blocking cavity and the oil inlet cavity, and the blocking mechanism is used for conducting control over the valve body by sliding and penetrating between the blocking cavity and the oil inlet cavity. The valve body is arranged between the standing valve and the pump cylinder of the oil well pump to control blocking of the oil inlet channel, the blocking mechanism slides and penetrates through the blocking cavity and the oil inlet cavity of the valve body to control opening and closing of the oil inlet channel, and the oil inlet channel can be prevented from being blocked in the well descending construction process of an oil well string under the matched arrangement of the structure. Hard wax, thick oil, dead oil and machine impurities enter the tubing string.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field production, in particular to an impact type anti-oil return device. Background Art

[0002] The sucker rod pump mainly consists of three parts: piston, pump barrel and fixed valve. The construction process of the sucker rod pump sucker rod string down into the well is as follows: the first step is to connect the sucker rod pump barrel and fixed valve to the lower part of the oil string, and lower the oil string into the well to the predetermined depth (usually several hundred meters to two thousand meters); the second step is to connect the sucker rod piston to the lower part of the sucker rod, and lower it into the oil string into the pump barrel along with the sucker rod.

[0003] During the first step of the above-mentioned construction, hard wax, thick oil, dead oil (hard oil blocks) and other impurities in the oil in the casing often enter the oil pipe string through the fixed valve of the oil pump. These hard wax, thick oil, dead oil and impurities entering the oil pipe string will cause the fixed valve of the oil pump to be poorly closed or unable to open, and may also cause the oil pump piston to be blocked from descending to the predetermined depth. These problems will affect the downhole construction of the sucker rod and the normal operation of the oil pump. Therefore, this solution proposes an impact-type anti-oil backflow device to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of the present invention is to provide an impact type anti-oil return device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an impact-type anti-oil backflow device, applied between the fixed valve and the pump barrel of the oil pump, comprising a valve body, the top of the valve body is connected to the bottom of the pump barrel of the oil pump, the bottom of the valve body is connected to the top of the fixed valve of the oil pump, the top of the valve body is provided with a blocking cavity, the bottom of the valve body is provided with an oil inlet cavity, the bottom of the blocking cavity and the top of the oil inlet cavity are through-connected, and a sealing mechanism is provided between the blocking cavity and the oil inlet cavity, and the sealing mechanism is used for conduction control of the valve body by sliding and inserting between the blocking cavity and the oil inlet cavity.

[0006] Preferably, the blocking mechanism includes:

[0007] A supporting cover is slidably connected to the blocking cavity and the oil inlet cavity, and the top of the supporting cover is slidably connected to the blocking cavity;

[0008] A blocking valve is slidably connected in the oil inlet cavity.

[0009] Preferably, an oil guide cavity is provided in the middle of the supporting cover, an oil inlet is provided on the side wall of the supporting cover, and the oil inlet and the oil guide cavity are connected in a through-connection manner.

[0010] Preferably, a connecting piece is provided between the top of the blocking valve and the bottom of the supporting cover, and the blocking valve is inserted into the connection between the blocking cavity and the oil inlet cavity to block the oil circuit.

[0011] Preferably, the connecting piece includes:

[0012] A joint, the joint being arranged at the bottom of the supporting cover;

[0013] A pilot valve, the top of the pilot valve is interpenetratingly connected to the middle of the joint, and the bottom of the pilot valve is sleeved with the middle of the blocking valve.

[0014] Preferably, the bottom of the supporting cover is provided with a first internal thread, the outer wall of the joint is provided with a first external thread, and the supporting cover and the joint are threadably connected through the first internal thread and the first external thread.

[0015] Preferably, a second internal thread is provided in the middle of the connector, a second external thread is provided on the top of the pilot valve, and the connector and the pilot valve are threadably connected via the second internal thread and the second external thread.

[0016] The technical effects and advantages of this utility model are:

[0017] After the oil pump is down, the oil pumping stopper valve is turned on, and the oil pumping stopper valve is turned on, so that the oil pumping stopper valve is turned on, and the oil pumping stopper valve is turned on. After the oil pumping stopper valve is turned on, the oil pumping stopper valve is turned on, and the oil pumping stopper valve is turned on, the oil pumping stopper valve is turned on, and the oil pumping stopper valve is turned on. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the closed state of the impact type anti-oil return device.

[0019] Figure 2 This is a schematic diagram of the structure of the impact-type anti-oil return device in the open state.

[0020] Figure 3 This is a schematic diagram of the structural connection between the impact-type anti-oil backflow device and the oil well pump.

[0021] In the figure: 1, supporting cover; 101, oil guide chamber; 102, oil inlet; 2, connector; 3, pilot valve; 4, blocking valve; 5, valve body; 501, blocking chamber; 502, oil inlet chamber. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] The utility model provides Figure 1-3 The impact-type anti-oil backflow device shown is applied between the fixed valve and the pump barrel of the oil pump, including a valve body 5, the top of the valve body 5 is connected to the bottom of the pump barrel of the oil pump, and the bottom of the valve body 5 is connected to the top of the fixed valve of the oil pump. A blocking chamber 501 is opened at the top of the valve body 5, and an oil inlet chamber 502 is opened at the bottom of the valve body 5. The bottom of the blocking chamber 501 and the top of the oil inlet chamber 502 are through-connected, and a sealing mechanism is provided between the blocking chamber 501 and the oil inlet chamber 502. The sealing mechanism is used for conduction control of the valve body 5 by sliding and inserting between the blocking chamber 501 and the oil inlet chamber 502.

[0024] It should be noted that the reference Figure 3 The connection content of the device shown is that the top of the valve body 5 is connected to the bottom of the pump barrel of the oil pipe string, and the bottom of the valve body 5 is connected to the top of the fixed valve. In this way, the sealing mechanism is used in conjunction with the arrangement of the valve body 5 to form a sealing control to prevent oil backflow between the pump barrel and the fixed valve, thereby avoiding the situation where the fixed valve of the oil pump is not closed tightly or cannot be opened due to hard wax, thick oil, dead oil and machine impurities entering the oil pipe string.

[0025] Specifically, the blocking mechanisms include:

[0026] The supporting cover 1 is slidably connected to the blocking cavity 501 and the oil inlet cavity 502, and the top of the supporting cover 1 is slidably connected to the blocking cavity 501;

[0027] Furthermore, an oil guide cavity 101 is provided in the middle of the supporting cover 1 , and an oil inlet 102 is provided on the side wall of the supporting cover 1 . The oil inlet 102 and the oil guide cavity 101 are in continuous communication.

[0028] It should be noted that the diameter of the area at the top of the support cover 1 matches the inner wall diameter of the blocking cavity 501. In this way, the coordination between the blocking cavity 501 and the top area of ​​the support cover 1 enables the adjustment and control of the moving range of the support cover 1 in the middle of the valve body 5.

[0029] The blocking valve 4 is slidably connected to the oil inlet cavity 502 .

[0030] Furthermore, a connector is provided between the top of the blocking valve 4 and the bottom of the supporting cover 1 , and the blocking valve 4 is inserted into the connection between the blocking cavity 501 and the oil inlet cavity 502 to block the oil circuit.

[0031] It should be noted that the blocking valve 4 enables the support cover 1 to block the connection between the blocking chamber 501 and the oil inlet chamber 502 during its movement in the blocking chamber 501 and the oil inlet chamber 502, thereby sealing the oil inlet 102 through the inner wall of the valve body 5, thereby sealing the oil transmission channel, thereby preventing hard wax, thick oil, dead oil and machine impurities from entering the fixed valve in the oil pipe string.

[0032] Specifically, the connector includes:

[0033] Joint 2, which is provided at the bottom of the supporting cover 1;

[0034] Furthermore, a first internal thread is provided on the bottom of the supporting cover 1, and a first external thread is provided on the outer wall of the joint 2. The supporting cover 1 and the joint 2 are threadably connected through the first internal thread and the first external thread.

[0035] The pilot valve 3 has its top connected to the middle of the connector 2 , and its bottom connected to the middle of the blocking valve 4 .

[0036] Furthermore, a second internal thread is provided in the middle of the connector 2, and a second external thread is provided on the top of the pilot valve 3. The connector 2 and the pilot valve 3 are threadably connected through the second internal thread and the second external thread.

[0037] It should be noted that, through the combination of the connector 2 and the pilot valve 3, the support cover 1, the connector 2, the pilot valve 3 and the blocking valve 4 form an integral moving structure, thereby ensuring that under the driving operation, the blocking mechanism formed by the support cover 1, the connector 2, the pilot valve 3 and the blocking valve 4 can move simultaneously.

[0038] The operating principle of this scheme is to refer to Figure 1 When the pump barrel and fixed valve of the oil well pump are lowered into the well along with the oil pipe string, the blocking valve 4 in the device contacts and seals with the valve body 5 and the pilot valve 3, so that the hard wax, thick oil, dead oil and impurities in the oil in the casing cannot enter the oil pipe string;

[0039] refer to Figure 2 When the sucker rod with the oil pump piston goes down to the predetermined depth in the oil pipe string, the oil pump piston will hit the support cover 1 in the utility model, causing the support cover 1 to move down, and the support cover 1 will drive the joint 2, pilot valve 3 and blocking valve 4 to move down together, thus forming the open state of the device, and the oil in the oil layer will enter the oil pipe string from the oil inlet 102 and the oil guide cavity 101 between the blocking valve 4 and the valve body 5, thus completing the sucker rod downhole construction and the normal operation of the oil pump.

[0040] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An impact type anti-oil return device, used between the fixed valve and the pump barrel of the oil pump, characterized in that: The utility model comprises a valve body (5), the top of the valve body (5) is connected to the bottom of the pump barrel of the oil pump, the bottom of the valve body (5) is connected to the top of the fixed valve of the oil pump, the top of the valve body (5) is provided with a blocking cavity (501), the bottom of the valve body (5) is provided with an oil inlet cavity (502), the bottom of the blocking cavity (501) and the top of the oil inlet cavity (502) are connected through, and a blocking mechanism is provided between the blocking cavity (501) and the oil inlet cavity (502), and the blocking mechanism is used for conducting control of the valve body (5) by sliding and inserting between the blocking cavity (501) and the oil inlet cavity (502).

2. The impact type anti-oil return device according to claim 1, characterized in that: The blocking mechanism comprises: A supporting cover (1), the supporting cover (1) is slidably connected to the blocking cavity (501) and the oil inlet cavity (502), and the top of the supporting cover (1) is slidably connected to the blocking cavity (501); A blocking valve (4) is slidably connected to the oil inlet cavity (502).

3. The impact type anti-oil return device according to claim 2, characterized in that: An oil guide cavity (101) is provided in the middle of the support cover (1), an oil inlet (102) is provided on the side wall of the support cover (1), and the oil inlet (102) and the oil guide cavity (101) are connected in a continuous manner.

4. The impact type anti-oil return device according to claim 2, characterized in that: A connecting piece is provided between the top of the blocking valve (4) and the bottom of the supporting cover (1), and the blocking valve (4) is inserted into the connection between the blocking cavity (501) and the oil inlet cavity (502) to block the oil circuit.

5. The impact type anti-oil return device according to claim 4, characterized in that: The connecting piece includes: A joint (2), the joint (2) being arranged at the bottom of the supporting cover (1); A pilot valve (3) is provided, wherein the top of the pilot valve (3) is connected to the middle of the connector (2) through an interlaced connection, and the bottom of the pilot valve (3) is sleeved to the middle of the blocking valve (4).

6. The impact type anti-oil return device according to claim 5, characterized in that: The bottom of the support cover (1) is provided with a first internal thread, the outer wall of the joint (2) is provided with a first external thread, and the support cover (1) and the joint (2) are connected by interlacing the first internal thread and the first external thread.

7. The impact type anti-oil return device according to claim 5, characterized in that: A second internal thread is provided in the middle of the connector (2), a second external thread is provided at the top of the pilot valve (3), and the connector (2) and the pilot valve (3) are connected through the second internal thread and the second external thread.

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