One-way valve pressure testing device capable of being backwashed

Abstract

The utility model relates to a backwashable one-way valve pressure test device, which comprises an extension sleeve, an extension sleeve joint, a lower joint and an upper joint, and the extension sleeve and the extension sleeve joint are sequentially connected onto a backwashable one-way valve from top to bottom; the upper joint is arranged at the upper end of the backwashing one-way valve and is provided with a pressurizing opening connected with the pressurizing joint; the lower joint is arranged at the lower end of the backwashing one-way valve and is provided with a pressurizing opening connected with the pressurizing joint; a first pressurizing opening and a second pressurizing opening are formed in the extension sleeve, and the first pressurizing opening is communicated with a liquid inlet in the reverse circulation cylinder sleeve; and the second pressurizing opening is communicated with a liquid inlet hole in the baffle valve cylinder sleeve. According to the utility model, hydraulic pressure can be converted into mechanical thrust so as to load the backwashable one-way valve; whether the backwashing one-way valve is well sealed or not can be recorded and verified; simulation sleeves of different specifications can be replaced, so that performance detection of backwashing one-way valves of different specifications can be met; the device can be rapidly and repeatedly disassembled and assembled, and multiple tests of the backwashable one-way valve can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-layer fracturing of horizontal wells in oil and gas fields, and in particular to a pressure testing device capable of backwashing a one-way valve. Background Art

[0002] At present, domestic shale gas horizontal well fracturing mainly adopts mechanical bridge plug isolation segmentation, including fast-drilling bridge plug, large-diameter bridge plug and soluble bridge plug. The bridge plug segmentation process has good effect, but it has high requirements on the borehole diameter. The fast-drilling bridge plug needs to be drilled and ground after fracturing, which is costly; the soluble bridge plug has poor solubility and poor controllability of dissolution time; the large-diameter bridge plug has the problem of stuck during pumping, which is difficult to handle. After fracturing, the wellbore is not full bore and affects drainage and other subsequent operations.

[0003] The patent (CN217080425U) discloses a sand-proof temporary plugging valve that can be repeatedly opened and closed and has a reverse circulation function. The backwashable check valve cooperates with the bottom drag fracturing packer to realize multi-layer fracturing in a segmented manner without bridge plug isolation. When sand plugging occurs, reverse circulation sand flushing and well washing can also be performed. How to quickly test the pressure of the backwashable check valve has become a difficult problem. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a backwashable one-way valve pressure testing device, which can be applicable to the rapid pressure testing of backwashable one-way valves of various types and specifications.

[0005] The technical solution adopted by the utility model is: a backwashable one-way valve pressure test device, characterized in that: it comprises an extension sleeve, an extension sleeve joint, a lower joint, an upper joint and a plug, the extension sleeve and the extension sleeve joint are connected to the backwashable one-way valve in sequence from top to bottom; the upper joint is arranged at the upper end of the backwashable one-way valve, and is provided with a pressure-testing port connected to the pressure-testing joint; the lower joint is arranged at the lower end of the backwashable one-way valve, and is provided with a pressure-testing port connected to the pressure-testing joint;

[0006] The extension sleeve is provided with a first pressure port and a second pressure port, the first pressure port is connected with the liquid inlet on the reverse circulation cylinder sleeve; the second pressure port is connected with the liquid inlet hole on the baffle valve cylinder sleeve; the pressure port of the upper joint, the pressure port of the lower joint, the first pressure port and the second pressure port are all provided with plugs.

[0007] Preferably, the extension sleeve, the extension sleeve joint and the backwashable one-way valve enclose two sealed cavities, the first pressure port is connected to one cavity, and the second pressure port is connected to the other cavity.

[0008] Preferably, the shear pin is not cut off, the baffle valve is in an open state, the plug seals the pressure port of the upper joint, and pressure is applied from the pressure port of the lower joint to test the sealing performance of the overall inner cavity of the backwashable one-way valve.

[0009] Preferably, the shear pin is cut off, the baffle valve is in a closed state, the plug seals the pressure port of the upper joint and the pressure port of the lower joint, and pressure is applied from the second pressure port to test whether the valve plate piston of the backwashable one-way valve opens under a certain pressure P1. If there is an obvious sudden drop in pressure when it opens, the baffle valve closes automatically.

[0010] Preferably, P1 is 7 MPa.

[0011] Preferably, the shear pin is cut off, the baffle valve is in a closed state, the plug 5 blocks the pressure port of the upper joint 4 and the pressure port of the lower joint 3, and pressure is applied from the first pressure port to test whether the backwash piston of the backwashable one-way valve opens under a certain pressure P2; if it is opened, the pressure will drop suddenly and the backwash piston will open.

[0012] Preferably, P2 is 15 to 18 MPa.

[0013] Preferably, the shear pin is cut off, the flapper valve is in a closed state, the plug seals the pressure port of the upper joint, and the pressure port of the lower joint is pressurized to test the sealing performance of the flapper valve of the backwashable one-way valve.

[0014] Preferably, the shear pin is cut off, the pressure-testing port of the lower joint is sealed with a plug, and the pressure-testing port of the upper joint is pressurized to test the internal sealing of the pipe string.

[0015] Preferably, sealing rings are provided between the extension sleeve, the extension sleeve joint and the backwashable one-way valve.

[0016] The beneficial effects achieved by the utility model are: it can realize converting hydraulic pressure into mechanical thrust, thereby adding load to the backwashable one-way valve; it can record and verify whether the sealing of the backwashable one-way valve is good; it can replace simulation sleeves of different specifications, thereby meeting the performance detection of backwashable one-way valves of different specifications and sizes; it can be quickly and repeatedly disassembled and assembled to realize multiple tests on the backwashable one-way valve; it has a simple structure, low cost, easy operation, strong versatility, and is mainly suitable for the performance detection of backwashable one-way valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a structural schematic diagram of a backwashable one-way valve;

[0019] Figure 3 A schematic diagram for testing the sealing performance of the entire inner cavity of a backwashable one-way valve;

[0020] Figure 4 A schematic diagram for testing whether the valve plate piston of a backwashable one-way valve can be opened;

[0021] Figure 5 A schematic diagram for testing the sealing performance of a backwashable check valve flapper;

[0022] Figure 6 A schematic diagram for testing whether the backwash piston of a backwashable one-way valve is open;

[0023] Figure 7 A schematic diagram for testing the internal sealing performance of a backwashable one-way valve string;

[0024] In the figure: 1. backwashable one-way valve; 11. reverse circulation cylinder sleeve; 111. liquid inlet; 12. reverse circulation piston; 13. baffle valve cylinder sleeve; 131. liquid inlet hole; 14. baffle valve push cylinder; 15. baffle valve; 16. shear pin; 2. extension sleeve; 21. first pressure port; 22. second pressure port; 3. extension sleeve joint; 4. upper joint; 5. lower joint. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] like Figure 1 As shown, a pressure test device for a backwashable one-way valve of the utility model comprises an extension sleeve 2, an extension sleeve joint 3, a lower joint 5, an upper joint 4 and a plug. The extension sleeve 2 and the extension sleeve joint 3 are connected to the backwashable one-way valve 1 in sequence from top to bottom; the upper joint 4 is arranged at the upper end of the backwashable one-way valve 1, and is provided with a pressure port connected to the pressure joint; the lower joint 5 is arranged at the lower end of the backwashable one-way valve 1, and is provided with a pressure port connected to the pressure joint; the extension sleeve 2 is provided with a first pressure port 21 and a second pressure port 22, the first pressure port 21 is connected to the liquid inlet 111 on the reverse circulation cylinder sleeve 11; the second pressure port 22 is connected to the liquid inlet hole 131 on the baffle valve cylinder sleeve 13. When the backwashable one-way valve 1 is pressure tested under different conditions, the corresponding test is completed by selectively pressing the pressure port of the upper joint 4, the pressure port of the lower joint 5, the first pressure port 21 and the second pressure port 22, and blocking the other pressure ports.

[0028] Combination Figure 2As shown, the pressure testing device in the utility model can perform a rapid pressure test on a backwashable one-way valve (CN217080425U).

[0029] In this embodiment, two sealed cavities are enclosed between the extension sleeve 2, the extension sleeve joint 3 and the backwashable one-way valve 1, the first pressure port 21 is connected to one cavity, and the second pressure port is connected to the other cavity.

[0030] The upper end of the extension sleeve 2 is bent inwards, and an O-type sealing ring is provided between the extension sleeve 2 and the backwashable one-way valve 1; the lower end of the extension sleeve 2 is threadedly connected to the upper end of the extension sleeve joint 3, and an O-type sealing ring is provided between them; the lower end of the extension sleeve joint 3 is bent inwards, and an O-type sealing ring is provided between the extension sleeve 2 and the backwashable one-way valve 1. A large sealed cavity is formed between the extension sleeve 2, the extension sleeve joint 3, the backwashable one-way valve 1, and the O-type sealing ring; a partition is provided in the middle of the extension sleeve 2, which divides the large cavity into two independent small cavities, and an O-type sealing ring is provided between the partition and the backwashable one-way valve 1. The first pressure port 21 is connected to the liquid inlet 111 on the reverse circulation cylinder sleeve 11 through one of the small cavities, and the second pressure port 22 is connected to the liquid inlet hole 131 on the baffle valve cylinder sleeve 13 through another small cavity.

[0031] Combination Figure 3 As shown, when the shear pin 16 is not cut off, the baffle valve push cylinder 14 is limited by the shear pin 16, and the baffle valve push cylinder 14 blocks the baffle valve 15, so that the baffle valve 15 cannot be closed, that is, the baffle valve 15 is in an open state; the pressure port of the upper joint 4 is sealed with a plug, and pressure is applied from the pressure port of the lower joint 4 to test the sealing performance of the overall inner cavity of the backwashable one-way valve 1.

[0032] Combination Figure 4 As shown, after entering the well, the shear pin 16 is cut off under the hydraulic impact. After the pressure is reduced or removed, the flapper valve push tube 14 moves upward under the action of the spring, and the flapper valve 15 is gradually closed; the flapper valve 15 is completely closed, and the pressure ports of the upper joint 4 and the lower joint 5 are both blocked with plugs, and pressure is applied from the second pressure port 22. The high-pressure liquid enters the piston chamber from the second pressure port 22 through the liquid inlet hole 131 on the flapper valve cylinder sleeve 13 to test whether the valve plate piston of the backwashable one-way valve is opened under a certain pressure P1 (7MPa) (that is, the flapper valve push tube 14 can push the flapper valve 15 to open). If the flapper valve 15 can be opened smoothly, the pressure will drop significantly, and the flapper valve 15 will close automatically.

[0033] Combination Figure 5As shown, after entering the well, the shear pin 16 is cut off under the hydraulic impact. After the pressure is reduced or removed, the flapper valve push cylinder 14 moves upward under the action of the spring, and the flapper valve 15 is gradually closed; the flapper valve 15 is completely closed, the pressure port of the upper joint 4 is blocked with a plug, and the pressure port of the lower joint 3 is pressurized to test the sealing performance of the flapper valve 15 of the backwashable one-way valve 1.

[0034] Combination Figure 6 As shown, after entering the well, the shear pin 16 is cut off under the hydraulic impact. After the pressure is reduced or removed, the flapper valve push cylinder 14 moves upward under the action of the spring, and the flapper valve 15 is gradually closed; the flapper valve 15 is completely closed, and the pressure ports of the upper joint 4 and the lower joint 5 are both blocked with plugs, and pressure is applied from the first pressure port 21. The high-pressure liquid enters the piston chamber from the first pressure port 21 through the liquid inlet 111 on the reverse circulation cylinder sleeve 11 to test whether the backwash piston of the backwashable check valve is opened under a certain pressure P2 (15-18 MPa); if it is opened, the pressure will drop suddenly and the backwash piston will open.

[0035] Combination Figure 7 As shown, after entering the well, the shear pin 16 is cut off under the hydraulic impact. After the pressure is reduced or removed, the flapper valve push cylinder 14 moves upward under the action of the spring, and the flapper valve 15 is gradually closed. The pressure port of the lower joint 5 is blocked with a plug, and pressure is applied from the pressure port of the upper joint 4 to test the internal sealing performance of the backwashable one-way valve 1 string.

[0036] It should be noted that the description of the above technical solution is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solution set forth herein. On the contrary, providing these descriptions will make the disclosure of the utility model thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the utility model is limited only by the scope of the claims.

[0037] Finally, it should be pointed out that the above embodiments are only representative examples of the present utility model. Obviously, the present utility model is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model shall be considered to belong to the protection scope of the present utility model.

Claims

1. A backwashable one-way valve pressure test device, characterized in that: It comprises an extension sleeve, an extension sleeve joint, a lower joint and an upper joint, wherein the extension sleeve and the extension sleeve joint are connected to the backwashable one-way valve in sequence from top to bottom; the upper joint is arranged at the upper end of the backwashable one-way valve, and is provided with a pressure port connected to the pressure joint; the lower joint is arranged at the lower end of the backwashable one-way valve, and is provided with a pressure port connected to the pressure joint; the extension sleeve is provided with a first pressure port and a second pressure port, the first pressure port is communicated with the liquid inlet on the reverse circulation cylinder sleeve; the second pressure port is communicated with the liquid inlet hole on the baffle valve cylinder sleeve.

2. The backwashable one-way valve pressure testing device according to claim 1, characterized in that: The extension sleeve, the extension sleeve joint and the backwashable one-way valve enclose two sealed cavities, the first pressure-pressing port is connected to one cavity, and the second pressure-pressing port is connected to the other cavity.

3. The backwashable one-way valve pressure testing device according to claim 1, characterized in that: The shear pin is not cut off, the flapper valve is in the open state, the plug seals the pressure port of the upper joint, and the pressure is applied from the pressure port of the lower joint to test the sealing performance of the overall inner cavity of the backwashable one-way valve.

4. The backwashable one-way valve pressure testing device according to claim 1, characterized in that: The shear pin is cut off, the flapper valve is in the closed state, the plug seals the pressure port of the upper joint and the pressure port of the lower joint, and pressure is applied from the second pressure port to test whether the valve plate piston of the backwashable check valve opens under a certain pressure P1. If the pressure drops significantly when it opens, the flapper valve closes automatically.

5. The backwashable one-way valve pressure testing device according to claim 4, characterized in that: P1 is 7MPa.

6. The backwashable one-way valve pressure testing device according to claim 1, characterized in that: The shear pin is cut off, the baffle valve is in the closed state, the plug seals the pressure port of the upper joint and the pressure port of the lower joint, and pressure is applied from the first pressure port to test whether the backwash piston of the backwashable check valve opens under a certain pressure P2; if it opens, the pressure will drop suddenly and the backwash piston will open.

7. The backwashable one-way valve pressure testing device according to claim 1, characterized in that: P2 is 15~18MPa.

8. The backwashable one-way valve pressure testing device according to claim 1, characterized in that: The shear pin is cut off, the flapper valve is in the closed state, the plug seals the pressure port of the upper joint, and the pressure port of the lower joint is pressurized to test the sealing performance of the flapper valve of the backwashable check valve.

9. The backwashable one-way valve pressure testing device according to claim 1, characterized in that: The shear pin is cut off, the pressure port of the lower joint is sealed with a plug, and the pressure port of the upper joint is pressurized to test the internal sealing of the pipe string.

10. The backwashable one-way valve pressure testing device according to claim 1, characterized in that: The extension sleeve, the extension sleeve joint and the backwashable one-way valve are all provided with sealing rings.

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