High-pressure wellhead injection molding pressure testing device

Abstract

The utility model belongs to the field of high-pressure wellhead injection molding pressure testing, and relates to a high-pressure wellhead injection molding pressure testing device. Comprising a lower shell, a piston and an upper shell. Downward movement and upward movement of the piston can be achieved by alternately connecting the pump with the downward movement cavity and the upward movement cavity in the lower shell, specifically, when the pump is connected with the downward movement cavity, the piston moves downwards, when the pump is connected with the upward movement cavity, the piston moves upwards and drives the piston rod to move, and when the piston rod moves towards one side of the grease injection opening, the piston rod moves downwards. The piston rod discharges grease in the grease injection cavity through the grease injection opening, and when the piston rod moves away from the grease injection opening, the grease injection cavity can be filled with the grease for the next grease injection operation. The device is simple and portable, can realize wellhead grease injection, and is favorable for improving the safety and efficiency of injection molding pressure test operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of petroleum exploration and exploitation, and relates to a high-pressure wellhead injection pressure testing device. Background Art

[0002] Wellhead equipment, as the core safety equipment in oil and gas development, is of great importance. It is usually composed of casing head, tubing head and Christmas tree. These three parts together form a solid barrier for oil and gas wellheads and ensure the safety of oil and gas production activities.

[0003] However, some special gas wells have the characteristics of ultra-high pressure, ultra-high temperature and ultra-deep wells, and the production conditions are extremely complex. In such an environment, the wellhead equipment faces severe challenges. With the full development of gas fields, wellhead equipment needs to serve for a long time, so the problem of well integrity gradually surfaces.

[0004] In order to ensure the safe use of wellhead equipment on site, injection molding pressure test has become an indispensable part. According to industry standards, the oil casing head of the gas tree needs to be subjected to injection molding pressure test at least twice a year, and the valve of the gas tree needs to be greased once. Although these two operations seem simple, due to the particularity and complexity of the wellhead equipment, the operation is relatively risky. In the actual operation process, there are problems such as low grease injection efficiency and lack of practical tools.

[0005] The existing injection molding pressure test tools are mainly manual hydraulic pumps, which are mainly composed of a hydraulic cylinder, a handle, a booster pump, a pressure gauge, etc. The structure is relatively simple, the injection molding displacement is relatively small, and the injection molding pressure test efficiency is low. The use of existing manual hydraulic pumps for maintenance of gas trees is labor-intensive and has low work efficiency.

[0006] In summary, the existing injection molding pressure test has the problems of high operation risk, relatively small injection molding displacement and low injection molding pressure test efficiency. Utility Model Content

[0007] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the utility model is to provide a high-pressure wellhead injection molding pressure test device. The utility model device is simple and portable, can realize wellhead grease injection, and is beneficial to improving the safety and efficiency of injection molding pressure test operations.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] The utility model discloses a high-pressure wellhead injection molding pressure testing device, comprising a lower shell, in which a piston is movably embedded, the piston divides the inner cavity of the lower shell into a downward cavity and an upward cavity, the downward cavity and the upward cavity are connected to a pump, and a reversing valve is arranged on the pump;

[0010] The piston is connected to a piston rod, the piston rod is movably arranged in the upper shell body, the end of the piston rod and the inner cavity of the upper shell body form a grease injection cavity, and a grease injection port connected with the grease injection cavity is opened on the upper shell body.

[0011] Furthermore, a downward interface is provided on the lower shell body, the downward interface is communicated with the downward cavity, and the downward interface is connected to the reversing valve through a pipeline.

[0012] Furthermore, a limiting portion is arranged in the downward cavity, and the limiting portion is located between the downward interface and the piston.

[0013] Furthermore, an upward interface is provided on the lower shell body, the upward interface is communicated with the upward cavity, and the upward interface is connected to the reversing valve through a pipeline.

[0014] Furthermore, the upstream interface is located at the end of the lower shell.

[0015] Furthermore, the upper shell is detachably connected to the gland, a grease injection port is provided on the gland, and the upper shell, the gland and the piston rod together form a grease injection cavity.

[0016] Furthermore, the grease injection cavity is a cylindrical cavity, the piston rod is a columnar rod, and the outer diameter of the piston rod is the same as the inner diameter of the grease injection cavity.

[0017] Furthermore, the grease injection port is connected to the grease injection check valves on the Christmas tree, the tubing head and the casing head through a grease injection pipeline.

[0018] Furthermore, the upper shell is detachably connected to the lower shell, and the upper shell, the lower shell and the piston together form a downward cavity.

[0019] Furthermore, the pump includes a pump body, which is located in the oil tank, the pump body is connected to the motor and the reversing valve respectively, a pressure gauge is arranged on the reversing valve, and the motor is connected to the remote control device.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. The utility model changes the direction of the pump through the reversing valve, and the pump alternately connects the downward cavity and the upward cavity in the lower shell to realize the downward and upward movement of the piston. Specifically, when the pump is connected to the downward cavity, the piston moves downward, and when the pump is connected to the upward cavity, the piston moves upward, and the piston rod is driven to move by the piston. When the piston rod moves toward the grease injection port, the piston rod discharges the grease in the grease injection cavity through the grease injection port. When the piston rod moves away from the grease injection port, the grease can be used to fill the grease injection cavity for the next grease injection operation. The utility model device is simple and portable, can realize wellhead grease injection, and is conducive to improving the safety and efficiency of injection molding pressure test operations.

[0022] 2. The reversing valve of the utility model is used to realize the switching of the connection between the pump body and the downward chamber and the upward chamber. A pressure gauge is arranged on the reversing valve. The pressure gauge is used to detect the grease injection pressure of the valve in real time and to grasp the grease injection status of the valve in real time. The motor is connected to the remote control device. By setting the remote control device to connect the motor, it is beneficial to remotely control the start and stop of the motor, realize remote control operation, and improve operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 This is a structural diagram of the upper shell, lower shell and piston assembly of the utility model.

[0025] Among them: 01, upper shell; 02, downward cavity; 03, downward interface; 04, upward interface; 05, upward cavity; 06, lower shell; 07, piston rod; 08, grease injection cavity; 09, gland; 10, grease injection port; 11, reversing valve; 12, pressure gauge; 13, motor; 14, oil tank; 15, remote control device; 16, piston; 17, pump; 18, limit part. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] The utility model is further described in detail below with reference to the accompanying drawings:

[0029] See also Figure 1The utility model discloses a high-pressure wellhead injection molding pressure test device, including a lower shell 06, in which a piston 16 is movably embedded, and the piston 16 divides the inner cavity of the lower shell 06 into a downward cavity 02 and an upward cavity 05, and both the downward cavity 02 and the upward cavity 05 are connected to a pump 17, and a reversing valve 11 is provided on the pump 17. The downward cavity 02 and the upward cavity 05 in the lower shell 06 are alternately connected by the pump 17, so that the piston 16 can be moved downward and upward. Specifically, when the pump 17 is connected to the downward cavity 02, the piston 16 moves downward, and when the pump 17 is connected to the upward cavity 05, the piston 16 moves upward.

[0030] The piston 16 is connected to the piston rod 07, and the piston rod 07 is movably arranged in the upper shell body 01. The end of the piston rod 07 and the inner cavity of the upper shell body 01 form a grease injection chamber 08. The upper shell body 01 is provided with a grease injection port 10 connected to the grease injection chamber 08. The piston 16 drives the piston rod 07 to move. When the piston rod 07 moves toward the grease injection port 10, the piston rod 07 discharges the grease in the grease injection chamber 08 through the grease injection port 10. When the piston rod 07 moves away from the grease injection port 10, the grease can be used to fill the grease injection chamber 08 for the next grease injection operation. The utility model is simple and portable, can realize wellhead grease injection, and is beneficial to improving the safety and efficiency of injection molding pressure test operations.

[0031] See also Figure 1 In another feasible embodiment of the utility model, the following is adaptively modified according to the situation. It includes a lower shell 06, in which a piston 16 is movably embedded, and the piston 16 divides the inner cavity of the lower shell 06 into a downward cavity 02 and an upward cavity 05, and the downward cavity 02 and the upward cavity 05 are both connected to a pump 17, and a reversing valve 11 is provided on the pump 17;

[0032] The piston 16 is connected to the piston rod 07 , and the piston rod 07 is movably arranged in the upper shell 01 . The end of the piston rod 07 and the inner cavity of the upper shell 01 form a grease injection cavity 08 . The upper shell 01 is provided with a grease injection port 10 connected to the grease injection cavity 08 .

[0033] When used specifically:

[0034] Connect the pump 17 to the downward cavity 02, the piston 16 moves downward, the piston rod 07 moves away from the grease injection port 10, and the grease is filled into the grease injection cavity 08 for grease injection operation;

[0035] The pump 17 is connected to the upward chamber 05, the piston 16 moves upward, and the piston rod 07 moves toward the grease injection port 10. The piston rod 07 discharges the grease in the grease injection chamber 08 through the grease injection port 10, and the grease injection operation is completed.

[0036] Embodiment 1:

[0037] See also Figure 1This embodiment discloses a high-pressure wellhead injection molding pressure test device, including a lower shell 06, in which a piston 16 is movably embedded, and the piston 16 divides the inner cavity of the lower shell 06 into a downward cavity 02 and an upward cavity 05, and the downward cavity 02 and the upward cavity 05 are both connected to a pump 17, and a reversing valve 11 is provided on the pump 17;

[0038] The piston 16 is connected to the piston rod 07 , and the piston rod 07 is movably arranged in the upper shell 01 . The end of the piston rod 07 and the inner cavity of the upper shell 01 form a grease injection cavity 08 . The upper shell 01 is provided with a grease injection port 10 connected to the grease injection cavity 08 .

[0039] Preferably, a downward interface 03 is provided on the lower shell 06, and the downward interface 03 is communicated with the downward chamber 02. The downward interface 03 is connected to the reversing valve 11 through a pipeline, and the pipeline is a hydraulic oil pipeline.

[0040] Preferably, an upward interface 04 is provided on the lower shell 06, and the upward interface 04 is communicated with the upward chamber 05. The upward interface 04 is connected to the reversing valve 11 through a pipeline, and the pipeline is a hydraulic oil pipeline.

[0041] Preferably, the upstream interface 04 is located at the end of the lower shell 06 .

[0042] Embodiment 2:

[0043] See also Figure 1 This embodiment discloses a high-pressure wellhead injection molding pressure test device, including a lower shell 06, in which a piston 16 is movably embedded, and the piston 16 divides the inner cavity of the lower shell 06 into a downward cavity 02 and an upward cavity 05, and the downward cavity 02 and the upward cavity 05 are both connected to a pump 17, and a reversing valve 11 is provided on the pump 17;

[0044] The piston 16 is connected to the piston rod 07 , and the piston rod 07 is movably arranged in the upper shell 01 . The end of the piston rod 07 and the inner cavity of the upper shell 01 form a grease injection cavity 08 . The upper shell 01 is provided with a grease injection port 10 connected to the grease injection cavity 08 .

[0045] Preferably, the upper shell 01 is detachably connected to the gland 09, and a grease injection port 10 is provided on the gland 09. The upper shell 01, the gland 09 and the piston rod 07 together form a grease injection cavity 08;

[0046] Removable connection methods include but are not limited to threaded connection, snap connection and key connection.

[0047] Preferably, the grease injection cavity 08 is a cylindrical cavity, the piston rod 07 is a columnar rod, and the outer diameter of the piston rod 07 is the same as the inner diameter of the grease injection cavity 08 .

[0048] Preferably, the grease injection port 10 is connected to the grease injection check valves on the Christmas tree, the tubing head and the casing head through a grease injection pipeline.

[0049] Embodiment three:

[0050] See also Figure 1 This embodiment discloses a high-pressure wellhead injection molding pressure test device, including a lower shell 06, in which a piston 16 is movably embedded, and the piston 16 divides the inner cavity of the lower shell 06 into a downward cavity 02 and an upward cavity 05, and the downward cavity 02 and the upward cavity 05 are both connected to a pump 17, and a reversing valve 11 is provided on the pump 17;

[0051] The piston 16 is connected to the piston rod 07 , and the piston rod 07 is movably arranged in the upper shell 01 . The end of the piston rod 07 and the inner cavity of the upper shell 01 form a grease injection cavity 08 . The upper shell 01 is provided with a grease injection port 10 connected to the grease injection cavity 08 .

[0052] Preferably, see Figure 2 , the upper shell 01 is detachably connected to the lower shell 06, and the upper shell 01, the lower shell 06 and the piston 16 together form a downward chamber 02;

[0053] Removable connection methods include but are not limited to threaded connection, snap connection and key connection.

[0054] Embodiment 4:

[0055] See also Figure 1 This embodiment discloses a high-pressure wellhead injection molding pressure test device, including a lower shell 06, in which a piston 16 is movably embedded, and the piston 16 divides the inner cavity of the lower shell 06 into a downward cavity 02 and an upward cavity 05, and the downward cavity 02 and the upward cavity 05 are both connected to a pump 17, and a reversing valve 11 is provided on the pump 17;

[0056] The piston 16 is connected to the piston rod 07 , and the piston rod 07 is movably arranged in the upper shell 01 . The end of the piston rod 07 and the inner cavity of the upper shell 01 form a grease injection cavity 08 . The upper shell 01 is provided with a grease injection port 10 connected to the grease injection cavity 08 .

[0057] Preferably, the pump 17 includes a pump body, which is located in the oil tank 14. The pump body is respectively connected to the motor 13 and the reversing valve 11. The reversing valve 11 is used to realize the switching of the connection between the pump body and the downward chamber 02 and the upward chamber 05. A pressure gauge 12 is arranged on the reversing valve 11. The pressure gauge 12 is used for the grease injection pressure of the valve and real-time grasp of the valve grease injection compliance status. By observing the pressure value of the pressure gauge 12, the injection amount can be quantitatively judged. When the pressure rises to the threshold value, it is determined that the valve injection molding has been filled. The motor 13 is connected to the remote control device 15. By setting the remote control device 15 to connect the motor 13, it is beneficial to remotely control the start and stop of the motor 13, realize remote control operations, and help improve operation safety.

[0058] Embodiment five:

[0059] See also Figure 1The present embodiment discloses a high-pressure wellhead injection molding pressure test device, which is mainly composed of an upper shell 01, a downward chamber 02, a downward interface 03, an upward interface 04, an upward chamber 05, a lower shell 06, a piston rod 07, a grease injection chamber 08, a gland 09, a grease injection port 10, a reversing valve 11, a pressure gauge 12, a motor 13, an oil tank 14 and a remote control device 15, a piston 16, a pump 17 and a limiter 18, wherein the pump 17 is an electric pump.

[0060] The upward interface 04 shown is connected to an electric pump, which provides power to push the piston rod to move upward, and the pressure is increased by changing the size of the upper and lower chambers; the grease injection chamber 08 is used to contain sealing grease; the reversing valve 11, the pressure gauge 12, the motor 13 and the oil tank 14 together form an electric pump to provide a power source; the downward interface 03 is also connected to the electric pump, and when the grease in the grease injection chamber 08 is completely injected into the wellhead equipment, the reversing valve 11 on the electric pump changes the flow direction of the hydraulic oil of the electric pump to push the piston rod downward; the grease injection port 10 is connected to the grease injection check valve on the gas production tree, the tubing head and the casing head through the grease injection pipeline, and the compressed grease is injected into the wellhead equipment through the grease injection port and the grease injection pipeline; the piston rod 07 moves up and down, and when it moves to the bottom, the gland 09 is disassembled to fill the sealing grease; the remote control device 15 can remotely control the switch to control the forward or reverse rotation of the motor to achieve remote intelligent control.

[0061] Based on the above structure, the utility model has the following beneficial effects:

[0062] 1. Compared with the original grease injection tool, the utility model has faster pressure injection and higher grease injection efficiency; the pressure injection speed of the original grease injection tool is 15 minutes / valve, and the pressure injection speed of the injection molding pressure test device of the present application is 1 minute / valve.

[0063] 2. The utility model can provide higher fat injection pressure, up to 120MPa, which can better meet the needs of high-pressure gas wells;

[0064] 3. The electric pump can not only provide a pressure source for the booster pump, but also replace the hand pump and be directly used for injection molding and pressure testing. It is simple to operate, safe and practical, and reduces operational risks.

[0065] 4. The remote control function has been added to further enhance the flexibility and convenience of the injection molding pressure test device.

[0066] The above content is only for explaining the technical idea of ​​the utility model and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. A high-pressure wellhead injection molding pressure test device, characterized in that: It comprises a lower housing (06), a piston (16) is movably embedded in the lower housing (06), the piston (16) divides the inner cavity of the lower housing (06) into a downward cavity (02) and an upward cavity (05), the downward cavity (02) and the upward cavity (05) are both connected to a pump (17), and a reversing valve (11) is provided on the pump (17); The piston (16) is connected to the piston rod (07), and the piston rod (07) is movably arranged in the upper shell (01). The end of the piston rod (07) and the inner cavity of the upper shell (01) form a grease injection cavity (08), and the upper shell (01) is provided with a grease injection port (10) connected to the grease injection cavity (08).

2. A high-pressure wellhead injection molding pressure test device according to claim 1, characterized in that: The lower shell (06) is provided with a downward interface (03), the downward interface (03) is communicated with the downward chamber (02), and the downward interface (03) is connected to the reversing valve (11) through a pipeline.

3. A high-pressure wellhead injection molding pressure test device according to claim 2, characterized in that: The lower shell (06) is provided with an upward interface (04), the upward interface (04) is communicated with the upward chamber (05), and the upward interface (04) is connected to the reversing valve (11) through a pipeline.

4. A high-pressure wellhead injection molding pressure test device according to claim 3, characterized in that: The upstream interface (04) is located at the end of the lower shell (06).

5. A high-pressure wellhead injection molding pressure test device according to claim 1, characterized in that: The upper shell (01) is detachably connected to the pressure cover (09), a grease injection port (10) is provided on the pressure cover (09), and the upper shell (01), the pressure cover (09) and the piston rod (07) together form a grease injection cavity (08).

6. A high-pressure wellhead injection molding pressure test device according to claim 5, characterized in that: The grease injection cavity (08) is a cylindrical cavity, the piston rod (07) is a columnar rod, and the outer diameter of the piston rod (07) is the same as the inner diameter of the grease injection cavity (08).

7. A high-pressure wellhead injection molding pressure test device according to claim 5, characterized in that: The grease injection port (10) is connected to the grease injection check valves on the gas tree, the tubing head and the casing head through a grease injection pipeline.

8. A high-pressure wellhead injection molding pressure test device according to any one of claims 1 and 5, characterized in that: The upper shell (01) is detachably connected to the lower shell (06); the upper shell (01), the lower shell (06) and the piston (16) together form a downward chamber (02).

9. A high-pressure wellhead injection molding pressure test device according to claim 1, characterized in that: The pump (17) comprises a pump body, which is located in an oil tank (14). The pump body is respectively connected to a motor (13) and a reversing valve (11). A pressure gauge (12) is arranged on the reversing valve (11). The motor (13) is connected to a remote control device (15).

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