A tubing pressure testing system

Abstract

The utility model belongs to the field of oil pipe pressure test, especially an oil pipe pressure test system. In order to solve the problems of low pressure test efficiency, inaccurate and unstable pressure drop data during pressure test, and water spray pollution workshop environment during pressure relief of the existing oil pipe pressure test machine, the utility model discloses a kind of emptying device in series in oil pipe pressure test system, including the valve body being equipped with upper and lower through passageway, passageway is sequentially provided with valve ball, ball seat and be used for the push mechanism for the control valve ball opening and closing from top to bottom, valve ball and ball seat will passageway be isolated as closed upper valve cavity and closed lower valve cavity, upper valve cavity and lower valve cavity are respectively communicated valve body import and valve body export. The emptying device is added to one end of oil pipe pressure test (plugging) trolley, exhaust through emptying device in water injection stage of pressure test, and drainage pressure relief through emptying device after pressure test is finished, thereby in improving water injection pressure test efficiency and ensuring the accuracy and stability of pressure drop data, avoid water spray pollution workshop environment during pressure relief.

Description

Technical Field

[0001] This utility model relates to an oil pipe pressure testing system, belonging to the field of oil pipe pressure testing. Background Technology

[0002] Tubing repair is a process that involves cleaning, sorting, flaw detection, repairing threads, and pressure testing of used tubing to bring it back to the required level for well use. Pressure testing is a crucial step in determining the tubing's suitability. Currently, the existing pressure testing methods are as follows: the tubing is fixed to a dedicated cable tray using a tubing clamping assembly. The pressure testing trolleys at both ends of the pressure testing machine (a water injection trolley and a sealing trolley) are simultaneously engaged. Water is injected and pressurized from one end of the tubing using a low-pressure pump and a high-pressure pump, while the other end is sealed with the sealing trolley. Because air is present in the tubing, and air is much more compressible than water, the pressure drop data detected during pressure stabilization is unstable. Furthermore, the presence of air in the tubing affects water injection, reducing pressure testing efficiency. Additionally, when depressurizing after the tubing pressure test, the pressure is released through the pressure relief valve of the high-pressure pump, leaving residual pressure in the tubing, which can cause water spray during depressurization to pollute the workshop environment. Utility Model Content

[0003] The purpose of this invention is to provide an oil pipe pressure testing system to solve the problems of low pressure testing efficiency, inaccurate and unstable pressure drop data, and water pollution in the workshop environment when the existing oil pipe pressure testing machine performs water injection pressure testing.

[0004] To achieve the above objectives, this utility model provides an oil pipe pressure testing system, including a pressure testing machine. A venting device is connected in series between the sealing end of the pressure testing machine and a water storage tank. The venting device includes a valve body with a through-channel running vertically through it. From top to bottom, a valve ball, a ball seat, and a push mechanism for controlling the opening and closing of the valve ball are arranged in the channel. The valve ball and ball seat isolate the channel into an upper valve chamber and a lower valve chamber. The top of the upper valve chamber is sealed by a valve body cover, and the bottom of the lower valve chamber is sealed by a push rod. The valve body has an inlet communicating with the upper valve chamber and an outlet communicating with the lower valve chamber. The inlet is connected to the first connecting section of the pressure testing head at the sealing end of the oil pipe, and the outlet is connected to the water storage tank, forming a closed-loop oil pipe pressure testing system.

[0005] Beneficial effects: This utility model is an improved invention. It introduces an air venting device into the oil pipe pressure testing machine to form a closed-loop pressure testing system. First, the valve ball is opened by the jacking mechanism to inject water and vent air, so that the air in the oil pipe is discharged from the outlet on the valve body, avoiding the influence of air on the pressure drop. Second, the jacking mechanism is retracted to close the ball valve, and the water injection test can be carried out. After the pressure test is completed, the valve ball is opened by the jacking mechanism, and the pressure-released water is directly discharged into the water storage tank to prevent the test water from leaking out. The test water can also be recycled.

[0006] Furthermore, the inlet is formed as a radial inlet in the radial direction of the valve body.

[0007] Beneficial effects: Convenient processing and easy connection.

[0008] Furthermore, a centering block adapted to the valve ball is provided on the ball seat on the opposite side of the radial inlet.

[0009] Beneficial effects: It guides and straightens the valve ball. When radial water inlet pushes the valve ball off the ball seat, the arc-shaped guide surface guides the valve ball to slide down steadily and sit on the ball seat.

[0010] Furthermore, the test head is provided with a second connecting section that communicates with the inner cavity of the oil pipe, and the opening of the first connecting section is set upward.

[0011] Beneficial effects: By setting the pressure test head, the end of the sealing trolley connected to the oil pipe is designed to be able to communicate outwards, which makes it easy to connect the oil pipe to the venting device through the pressure test head for air and water drainage. In addition, the opening of the first connecting short section is set upwards, which makes it easy for gas to be discharged from the upward opening of the first connecting short section when water is injected, thus preventing gas from forming an air blockage in the oil pipe.

[0012] Furthermore, the channel is provided with a positioning step, and the ball seat is installed on the positioning step.

[0013] Beneficial effects: After long-term use, the ball seat of the venting device is prone to wear. In order to ensure the sealing performance of the valve ball during setting, the ball seat needs to be replaced. However, this utility model sets the ball seat and valve body to be detachably connected, which facilitates the replacement of the ball seat and reduces maintenance costs.

[0014] Furthermore, the contact area between the ball seat and the valve ball is shaped to match the shape of the valve ball, and a double-sided sealing ring is provided between the ball seat and the positioning step.

[0015] Beneficial effects: The matching shape of the ball seat and the valve ball can improve the sealing performance when the valve ball is set, and the double-sided sealing ring can fully guarantee the sealing performance between the ball seat and the valve body.

[0016] Furthermore, the outlet is formed in the radial direction of the valve body, creating a radially penetrating outlet.

[0017] Beneficial effect: Two outlets are opened radially upwards, so that when venting or draining, the reaction forces of venting or draining on both sides of the venting device cancel each other out, ensuring the stability of the venting device position.

[0018] Furthermore, the top cover is detachably fixed to the top of the valve body by bolts, and a compression spring is provided between the top cover and the valve ball to apply a downward settling force to the valve ball onto the ball seat.

[0019] Beneficial effects: The detachable connection makes disassembly and assembly convenient, facilitating the installation, maintenance, and replacement of the valve ball and seat; the pressure spring ensures that after the push rod retracts, the valve ball can quickly sit on the seat under the pressure of the pressure spring, and improves the sitting force.

[0020] Furthermore, the jacking mechanism includes a jacking rod and a jacking drive mechanism, wherein the jacking drive mechanism is a jacking cylinder or a lead screw and nut mechanism.

[0021] Beneficial effects: Simple structure and easy to manufacture.

[0022] Furthermore, a sealing ring is provided between the lower part of the push rod and the cavity wall of the lower valve chamber, and the sealing ring is located on the lower side of the outlet; the diameter of the push rod gradually increases from top to bottom, or the diameter of the push rod increases in a gradient from top to bottom.

[0023] Beneficial effects: The sealed connection ensures that water is discharged from the valve body outlet; the large diameter variation of the push rod can improve the efficiency of air venting and drainage. Attached Figure Description

[0024] Figure 1 This is a partial cross-sectional schematic diagram of the venting device in the oil pipe pressure testing system of this utility model.

[0025] Figure 2 This is a partial cross-sectional view of the venting device in the oil pipe pressure testing system of this utility model from another perspective.

[0026] Figure 3 This is a schematic diagram of the overall structure of the oil pipe pressure testing system using this utility model.

[0027] Figure 4 This is a schematic diagram showing the connection of the venting device in the overall structure of the oil pipe pressure testing system of this utility model.

[0028] The components are: 1. High-pressure valve body, 2. Push rod, 3. Push drive mechanism, 4. Upper valve chamber, 5. Inlet, 6. Water outlet ring, 7. Outlet, 8. Lower valve chamber, 9. Double-sided sealing ring, 10. Ball seat, 11. Valve ball, 12. Mixing valve, 13. Water injection screw trolley, 14a. Oil pipe water injection end test head, 14b. Oil pipe plugging end test head, 15. Oil pipe, 16. Oil pipe clamping assembly, 17. Automatic straightening assembly, 18. Pluging trolley, 19. Drain pipe, 20. Drainage device. Detailed Implementation

[0029] To address the problems in the background technology, the core inventive concept of this utility model is as follows: an air venting device is installed at one end of the oil pipe pressure test sealing trolley. During the water injection stage of the pressure test, the air venting device is used to vent air. After the pressure test is completed, the air venting device is used to drain water and release pressure. The drained water is directly introduced into the water storage tank, thus forming a closed-loop pressure test system. This improves the efficiency of water injection pressure test and ensures the accuracy and stability of pressure drop data, while avoiding water spraying and pollution of the workshop environment during pressure release.

[0030] The present invention will be further described in detail below with reference to embodiments of the oil pipe pressure testing system.

[0031] like Figure 1 and Figure 2 As shown, the oil pipe pressure testing system of this utility model includes a pressure testing machine. A venting device 20 is connected in series between the sealing end of the pressure testing machine and the water storage tank. The venting device 20 includes a high-pressure valve body 1. The valve body has a through-channel running vertically through it. From top to bottom, the channel contains a valve ball 11, a ball seat 10, and a pushing mechanism for controlling the opening and closing of the valve ball. The pushing mechanism includes a pushing rod 2 and a pushing cylinder 3. The pushing rod 2 is composed of multiple sections of equal-diameter rods with increasing diameters from top to bottom. The contact area between the ball seat 10 and the valve ball 11 is shaped to match the shape of the valve ball 11. An arc-shaped straightening block, matching the shape of the valve ball 11, is provided on the ball seat 10 on the opposite side of the radial inlet. The arc-shaped straightening block is integrally formed with the ball seat 10. A positioning step is provided in the channel, and the ball seat 10 is installed on the positioning step. The ball seat 10 and the positioning step... A double-sided sealing ring 9 is provided between the valve body and the valve ball 11 and the ball seat 10 to isolate the channel into an upper valve chamber 4 and a lower valve chamber 8. The top of the upper valve chamber 4 is closed by the top cover of the valve body 1, and the bottom of the lower valve chamber 8 is closed by the push rod 2. The high-pressure valve body 1 is provided with an inlet 5 that communicates with the upper valve chamber 4. The inlet 5 is opened in the radial direction of the high-pressure valve body 1 to form a radial inlet. The inlet 5 is connected to the first connecting short section of the oil pipe sealing end test head 14. The opening of the first connecting short section is set upward. The high-pressure valve body 1 is provided with an outlet 7 that communicates with the lower valve chamber 8. The outlet 7 is opened in the radial direction of the high-pressure valve body 1 to form a radial outlet that runs through the radial direction. The outlet 7 is connected to the water storage tank. The top cover is detachably fixed to the top of the high-pressure valve body 1 by bolts. A sealing ring is provided between the lower part of the push rod 2 and the cavity wall of the lower valve chamber 8. The sealing ring is located below the outlet 7.

[0032] When a large volume of water is injected into the oil pipe 15 through the water injection screw trolley 13, the push drive mechanism 3 pushes the push rod 2 upward, which lifts the valve ball 11, making the lower valve chamber 8 communicate with the upper valve chamber 4. At this time, the gas in the oil pipe 15, driven by the injected water, enters the valve body through the valve body inlet 5, passes through the upper valve chamber 4 and the lower valve chamber 8 in sequence, and is discharged from the outlet 7. When the oil pipe 15 is full of water, water will overflow through the outlet 7 of the venting device 20. When water overflow is detected, the push drive mechanism 3 drives the push rod 2 to move downward, and the valve ball 11 is seated on the ball seat 10 under the power of water flow and its own gravity, thereby closing the communication channel between the lower valve chamber 8 and the upper valve chamber 4, and the water injection test can be carried out. As the water pressure in the oil pipe 15 rises, the seating pressure of the valve ball 11 on the ball seat 10 gradually increases, making the seal tighter and completing the pressure test of the oil pipe 15. When the pressure test is completed and the pressure is released, the push drive mechanism 3 drives the push rod 2 to lift the valve ball 11, and the water is drained through the water outlet ring 6. That is, the water in the oil pipe 15 enters the valve body through the valve body inlet 5, passes through the upper valve chamber 4 and the lower valve chamber 8 in sequence, and is discharged from the outlet 7. It should be noted that a low-pressure pump can be used during the venting process, while a high-pressure pump can be used during the pressure test.

[0033] like Figure 3 As shown, in the oil pipe pressure testing system of this utility model, the oil pipe clamping assembly 16 fixes the oil pipe 15 to the special bridge frame. The pressure testing trolleys (water injection tightening trolley 13 and sealing trolley 18) at both ends of the pressure testing machine are simultaneously tightened. Water is injected and pressurized from one end of the oil pipe 15 through the low-pressure pump and the high-pressure pump, and the other end is sealed by the sealing trolley 18. An automatic straightening assembly 17 is fixed on the sealing trolley 18 to straighten the oil pipe 15. An oil pipe sealing end pressure testing head 14b is provided between the sealing trolley 18 and the oil pipe 15. The oil pipe sealing end pressure testing head 14b is provided with a first connecting short with the opening facing upward. The first connecting section is connected to the inlet 5 of the venting device 20. A second connecting section connected to the inner cavity of the oil pipe 15 is provided on the oil pipe sealing end test head 14b. An oil pipe water injection end test head 14a is provided between the water injection screw-in trolley 13 and the oil pipe 15. A third connecting section connected to the inner cavity of the oil pipe 15 is provided on the oil pipe water injection end test head 14a. A fourth connecting section connected to the mixing valve 12 is also provided on the oil pipe water injection end test head 14a. A low-pressure pump and a high-pressure pump are connected in parallel at the other side of the mixing valve 12. The upstream of the low-pressure pump and the high-pressure pump is connected to a water storage tank. For example... Figure 4 As shown, the venting device 20 is connected to the water storage tank through the drain pipe 19.

[0034] In other embodiments, a compression spring can be provided between the top cover and the valve ball 11 to apply a downward force to the valve ball 11 to sit on the ball seat 10, so as to ensure that after the push rod 2 retracts, the valve ball 11 can sit on the ball seat 10 as soon as possible under the pressure of the compression spring and improve the sitting force.

[0035] In other embodiments, the push-drive structure 3 can also be a lead screw and nut mechanism.

[0036] In other embodiments, the push rod 2 may also consist of a rod whose diameter gradually increases from top to bottom.

[0037] In other embodiments, the arc-shaped straightening block can also be set separately from the ball seat 10. When in use, the two can be fixedly connected together and the contact interface can be sealed.

[0038] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some technical features, or organically combine different types of specific implementation methods to create the specific implementation methods shown in the accompanying drawings. Of course, those skilled in the art can also create other specific implementation methods not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tubing pressure testing system, comprising a pressure testing machine, characterized in that: A venting device is connected in series between the sealing end of the pressure testing machine and the water storage tank. The venting device includes a valve body with a through channel running vertically through it. From top to bottom, the channel contains a valve ball, a ball seat, and a push mechanism for controlling the opening and closing of the valve ball. The valve ball and ball seat isolate the channel into an upper valve chamber and a lower valve chamber. The top of the upper valve chamber is sealed by a valve body cover, and the bottom of the lower valve chamber is sealed by a push rod. The valve body has an inlet communicating with the upper valve chamber and an outlet communicating with the lower valve chamber. The inlet is connected to the first connecting section of the pressure testing head at the sealing end of the oil pipe, and the outlet is connected to the water storage tank, forming a closed-loop oil pipe pressure testing system.

2. The tubing pressure testing system according to claim 1, characterized in that: The inlet is formed as a radial inlet in the radial direction of the valve body.

3. The tubing pressure testing system according to claim 2, characterized in that: The ball seat has a centering block adapted to the shape of the valve ball on the opposite side of the radial inlet.

4. The tubing pressure testing system according to claim 1, characterized in that: The oil pipe sealing end test head is provided with a second connecting short section that communicates with the inner cavity of the oil pipe, and the opening of the first connecting short section is set upward.

5. The tubing pressure testing system according to claim 1 or 3, characterized in that: The channel is provided with a positioning step, and the ball seat is installed on the positioning step.

6. The tubing pressure testing system according to claim 5, characterized in that: The contact area between the ball seat and the valve ball is shaped to match the shape of the valve ball, and a double-sided sealing ring is provided between the ball seat and the positioning step.

7. The tubing pressure testing system according to claim 1, characterized in that: The outlet is located in the radial direction of the valve body, forming a radially penetrating outlet.

8. The tubing pressure testing system according to claim 1, characterized in that: The top cover is detachably fixed to the top of the valve body by bolts, and a compression spring is provided between the top cover and the valve ball to apply a downward settling force to the valve ball onto the ball seat.

9. The tubing pressure testing system according to claim 1, characterized in that: The jacking mechanism includes a jacking rod and a jacking drive mechanism, wherein the jacking drive mechanism is a jacking cylinder or a lead screw and nut mechanism.

10. The tubing pressure testing system according to claim 8 or 9, characterized in that: A sealing ring is provided between the lower part of the push rod and the cavity wall of the lower valve chamber, and the sealing ring is located on the lower side of the outlet; the diameter of the push rod gradually increases from top to bottom, or the diameter of the push rod increases in a gradient from top to bottom.

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