Rapid exhaust device for oil pipe pressure test

Abstract

The utility model discloses an oil pipe pressure test quick exhaust device which comprises a body, an air cylinder assembly and an upper cover, the air cylinder assembly is connected with the body through screws, the upper cover is connected with the body through threads, and an O-shaped sealing ring is arranged at the joint of the upper cover and the body. A valve element is vertically arranged in the upper cavity, and the bottom of the valve element is of a conical surface structure. A push rod is vertically arranged in the lower cavity, and the bottom of the push rod is connected with the top of a piston rod of the air cylinder assembly. By utilizing the guide structure of the valve core, the bottom of the valve core accurately falls on the top of the communicating cavity, and the sealing effect is good; the spring of the valve core is combined, so that the valve core quickly returns and is pressed at the top of the communicating cavity, and the sealing of the communicating cavity by the valve core is ensured; in addition, through the combination of the push rod and the cylinder assembly, the communication between the upper cavity and the lower cavity can be quickly realized, and the quick exhaust in the oil pipe pressure test pipe can be better realized.

Description

Technical Field

[0001] This utility model belongs to the field of oilfield equipment maintenance technology, and in particular relates to a rapid venting device for oil pipe pressure testing. Background Technology

[0002] Tubing provides a channel for oil and gas flow during oil and gas well production, ensuring that the oil, gas, and water produced from the formation can be transported from the bottom of the well to the wellhead. Furthermore, downhole operations such as well kill, well washing, acidizing, and cracking all require tubing. Its quality directly affects the efficiency of oil and gas production. Tubing pressure testing is a mandatory procedure before tubing leaves the factory and is an important measure for ensuring tubing quality, especially for the repair of old tubing, where it is an indispensable task.

[0003] In the past, manual pressure testing was used, which was inefficient. Therefore, automatic pressure testing machines are now generally used. The current venting device uses a ball valve for venting, but it has been found to be unreliable, prone to failure, and has poor high-pressure sealing. Therefore, it is necessary to design a new type of rapid venting device for oil pipe pressure testing. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a rapid venting device for oil pipe pressure testing, which addresses the shortcomings of the prior art. By utilizing the guiding structure of the valve core, the bottom of the valve core is accurately placed on the top of the connecting cavity, resulting in a good sealing effect. Combined with the spring of the valve core, the valve core quickly returns to its original position and is pressed tightly on the top of the connecting cavity, ensuring the sealing of the connecting cavity by the valve core. In addition, by utilizing the combination of push rod and cylinder assembly, the upper and lower cavities can be quickly connected, thereby better realizing the rapid venting of oil pipe pressure testing.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a rapid venting device for oil pipe pressure testing, including a body, a cylinder assembly disposed at the bottom of the body, and a top cover disposed at the top of the body. The cylinder assembly and the body are connected by screws, and the top cover and the body are connected by threads. An O-ring is provided at the connection between the top cover and the body.

[0006] A partition plate is horizontally arranged inside the main body, which divides the interior of the main body into upper and lower parts. The area inside the main body above the partition plate is the upper cavity, and the area inside the main body below the partition plate is the lower cavity. The upper cavity and the lower cavity are connected by a connecting cavity on the partition plate. An upper connection port is opened on one side of the upper cavity, and a lower connection port is opened on one side of the lower cavity.

[0007] A valve core is vertically arranged in the upper cavity. The top of the valve core is located in a cylindrical hole, and the bottom of the valve core extends into the communicating cavity. A mounting hole is provided on the top of the valve core, and a spring is installed in the mounting hole. The bottom of the valve core has a conical structure.

[0008] A push rod is vertically arranged in the lower cavity, the top of the push rod extends into the communicating cavity, and the bottom of the push rod is connected to the top of the piston rod of the cylinder assembly.

[0009] Furthermore, one end of the spring is fixed to the bottom of the mounting hole, and the other end of the spring extends outside the mounting hole and is connected to the top of the cylindrical hole.

[0010] Furthermore, the top of the communicating cavity is a conical structure that mates with the bottom of the valve core; the inner diameter of the communicating cavity is larger than the diameter of the push rod.

[0011] Furthermore, the cylindrical hole is located at the bottom of the upper cover, and the outer side of the top of the valve core mates with the inner wall of the cylindrical hole.

[0012] The beneficial effects of this utility model are that the guide structure of the valve core ensures that the bottom of the valve core accurately lands on the top of the connecting cavity, resulting in a good sealing effect; combined with the spring of the valve core, the valve core quickly returns to its original position and is pressed tightly on the top of the connecting cavity, ensuring the valve core seals the connecting cavity; in addition, the combination of the push rod and the cylinder assembly can quickly achieve the connection between the upper and lower cavities, better realizing the rapid venting of the oil pipe test tube.

[0013] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Explanation of reference numerals in the attached figures:

[0016] 1—Cylinder assembly; 2—Push rod; 3—Body;

[0017] 4—Valve core; 5—O-ring seal; 6—Top cover;

[0018] 7—Spring; 9—Cylindrical hole; 10—Separator plate;

[0019] 11—Upper cavity; 12—Lower cavity; 13—Connecting cavity;

[0020] 14—Upper connection port; 15—Lower connection port; 16—Mounting hole. Detailed Implementation

[0021] like Figure 1As shown, this utility model includes a body 3, a cylinder assembly 1 disposed at the bottom of the body 3, and an upper cover 6 disposed at the top of the body 3. The cylinder assembly 1 and the body 3 are connected by screws, and the upper cover 6 and the body 3 are connected by threads. An O-ring seal 5 is provided at the connection between the upper cover 6 and the body 3.

[0022] A partition plate 10 is horizontally arranged inside the main body 3, dividing the interior of the main body 3 into upper and lower parts. The area inside the main body 3 above the partition plate 10 is the upper cavity 11, and the area inside the main body 3 below the partition plate 10 is the lower cavity 12. The upper cavity 11 and the lower cavity 12 are connected by a connecting cavity 13 on the partition plate 10. An upper connecting port 14 is opened on one side of the upper cavity 11, and a lower connecting port 15 is opened on one side of the lower cavity 12.

[0023] A valve core 4 is vertically arranged in the upper cavity 11. The top of the valve core 4 is arranged in the cylindrical hole 9, and the bottom of the valve core 4 extends into the communicating cavity 13. A mounting hole 16 is opened on the top of the valve core 4, and a spring 7 is arranged in the mounting hole 16. The bottom of the valve core 4 has a conical structure.

[0024] A push rod 2 is vertically arranged inside the lower cavity 12. The top of the push rod 2 extends into the communicating cavity 13, and the bottom of the push rod 2 is connected to the top of the piston rod of the cylinder assembly 1.

[0025] In actual use, by utilizing the guiding structure of the valve core 4, the bottom of the valve core 4 is accurately placed on the top of the connecting cavity 13, resulting in a good sealing effect. Combined with the spring 7 of the valve core 4, the valve core 4 quickly returns to its original position and is pressed against the top of the connecting cavity 13, ensuring the sealing of the connecting cavity 13 by the valve core 4. In addition, by utilizing the combination of the push rod 2 and the cylinder assembly 1, the connection between the upper cavity 11 and the lower cavity 12 can be quickly realized, better realizing the rapid venting of the oil pipe test tube.

[0026] It should be noted that the cylindrical hole 9 at the bottom of the upper cover 6 is for installing the valve core 4 and serves as a guide for the valve core; the mounting hole 16 at the top of the valve core 4 is for installing the spring 7; the top of the connecting cavity 13 has a conical structure to cooperate with the valve core 4 and seal the valve core 4. The upper cavity 11 is connected to the testing machine through the upper connection port 14; the lower cavity 12 is open to the atmosphere through the lower connection port 15. The cylinder assembly 1 used can be purchased as a finished product without processing, which can reduce equipment costs.

[0027] When using this invention, during oil pipe pressure testing, the low-pressure, high-displacement pump is first started, simultaneously supplying power to the solenoid valve controlling the cylinder assembly. This causes the cylinder assembly 1 to operate, extending the piston rod. Simultaneously, the push rod 2 connected to the piston rod is displaced, pushing the valve core 4 upwards. The spring 7 is compressed, opening the connecting cavity 13 in the middle of the body 3. At this time, air from the oil pipe enters the upper connection port 14 on the body, then the upper cavity 11, and then the connecting cavity 13 before entering the lower cavity 12. Finally, air exits from the lower connection port 14... 5. Discharge into the atmosphere; After the low-pressure high-displacement pump has been working for a certain period of time, the power supply is automatically cut off, the low-pressure high-displacement pump stops working, and at the same time the solenoid valve controlling cylinder assembly 1 is also de-energized, the piston rod retracts, and at this time the valve core 4 automatically closes under the action of spring 7, cutting off the upper chamber 11 and the lower chamber 12, completing the water filling and air venting in the oil pipe pressure test pipe; then start the small displacement high-pressure pump to pressurize the oil pipe. Due to the spring preload and the action of high-pressure liquid, the valve core 4 is tightly stuck on the connecting chamber 13.

[0028] like Figure 1 As shown, in this embodiment, one end of the spring 7 is fixed to the bottom of the mounting hole 16, and the other end of the spring 7 extends outside the mounting hole 16 and is connected to the top of the cylindrical hole 9.

[0029] In this embodiment, the top of the connecting cavity 13 is a conical structure that mates with the bottom of the valve core 4; the inner diameter of the connecting cavity 13 is larger than the diameter of the push rod 2.

[0030] In this embodiment, the cylindrical hole 9 is opened at the bottom of the upper cover 6, and the outer side of the top of the valve core 4 is engaged with the inner wall of the cylindrical hole 9.

[0031] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A tubing pressure test quick exhaust device, characterized by: Includes a body (3), a cylinder assembly (1) disposed at the bottom of the body (3), and an upper cover (6) disposed at the top of the body (3). The cylinder assembly (1) and the body (3) are connected by screws, and the upper cover (6) and the body (3) are connected by threads. An O-ring (5) is provided at the connection between the upper cover (6) and the body (3). A partition plate (10) is horizontally arranged inside the main body (3). The partition plate (10) divides the interior of the main body (3) into upper and lower parts. The area inside the main body (3) above the partition plate (10) is the upper cavity (11), and the area inside the main body (3) below the partition plate (10) is the lower cavity (12). The upper cavity (11) and the lower cavity (12) are connected by a connecting cavity (13) on the partition plate (10). An upper connection port (14) is opened on one side of the upper cavity (11), and a lower connection port (15) is opened on one side of the lower cavity (12). A valve core (4) is vertically arranged in the upper cavity (11). The top of the valve core (4) is arranged in the cylindrical hole (9), and the bottom of the valve core (4) extends into the connecting cavity (13). A mounting hole (16) is opened on the top of the valve core (4), and a spring (7) is arranged in the mounting hole (16). The bottom of the valve core (4) has a conical structure. A push rod (2) is vertically arranged in the lower cavity (12). The top of the push rod (2) extends into the connecting cavity (13), and the bottom of the push rod (2) is connected to the top of the piston rod of the cylinder assembly (1).

2. The tubing pressure test quick exhaust device of claim 1, wherein: One end of the spring (7) is fixed to the bottom of the mounting hole (16), and the other end of the spring (7) extends outside the mounting hole (16) and is connected to the top of the cylindrical hole (9).

3. The tubing pressure test quick exhaust device of claim 1, wherein: The top of the connecting cavity (13) is a conical structure that mates with the bottom of the valve core (4); the inner diameter of the connecting cavity (13) is larger than the diameter of the push rod (2).

4. The tubing pressure test quick exhaust device of claim 1, wherein: The cylindrical hole (9) is opened at the bottom of the upper cover (6), and the outer side of the top of the valve core (4) is fitted with the inner wall of the cylindrical hole (9).

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