Leakage type pipe testing device
By designing a drainable pipe tester, which utilizes a check valve and a sliding sleeve switch to achieve unidirectional flow and drainage of liquid, the problem of high labor intensity and environmental pollution caused by oil pipe leakage is solved, and the effects of reducing operating costs and protecting the environment are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-09
- Publication Date
- 2026-04-14
AI Technical Summary
In stratified water injection oilfields, abnormal water injection volume caused by tubing leakage or packer failure leads to high labor intensity, high operating costs, and environmental pollution.
Design a drainable tube tester, comprising a central flow channel and a bypass drain channel. It utilizes a check valve and a sliding sleeve switch to achieve unidirectional liquid flow and draining. The drain channel is opened by breaking a breakable component to drain the liquid.
It reduced the labor intensity and operating costs for workers, prevented liquid spills from polluting the environment, and ensured that normal production was not affected.
Smart Images
Figure CN224120232U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of devices for determining liquid leaks, and in particular relates to a drainable pipe detector. Background Technology
[0002] In oilfields developed using stratified water injection technology, an abnormal situation may occur where the water injection volume suddenly increases significantly when using stratified injection tubing. There are two main causes for this anomaly: tubing leakage and packer failure. Currently, verifying tubing leakage (which can be simply referred to as tubing inspection) is a commonly used inspection method.
[0003] To verify whether the tubing is leaking, firstly, a drop ball needs to be inserted into the tubing, and the drop ball is seated on the test ball seat of the injection string. Then, pressure is applied to the tubing, and the pressure inside the tubing is checked to determine if there is a leak. If the pressure remains stable at high pressure, it indicates that the tubing is not leaking, but the packer has failed, and the tubing string needs to be removed to replace the packer. If the pressure gradually decreases, it indicates that the tubing is leaking, and the tubing string needs to be removed to repair the tubing.
[0004] When pulling out the tubing, the tubing is heavy due to the large amount of liquid still inside, resulting in high labor intensity and operating costs for workers. At the same time, during the tubing pulling process, the liquid inside the tubing will overflow to the outside of the well and pollute the environment. Utility Model Content
[0005] The purpose of this invention is to provide a drainable tube tester to solve the technical problems of high operating costs, high labor intensity for workers, and environmental pollution caused by lifting tubes with liquid.
[0006] To achieve the above objectives, the technical solution of the drainable tube tester provided by this utility model is as follows:
[0007] A drainable tube tester includes a tubular body extending vertically. The tubular body has a central flow channel and a drain flow channel. The drain flow channel has an inlet and an outlet connected to the central flow channel, and the inlet is located above the outlet.
[0008] The central flow channel is equipped with a sliding sleeve and a check valve for allowing liquid to flow unidirectionally from bottom to top. The check valve is located between the inlet and the outlet.
[0009] The sliding sleeve has a flow channel that runs through the sliding sleeve in the vertical direction. The sliding sleeve is installed on the tubular body by a breakable component and is used to block the liquid inlet. The central flow channel located below and adjacent to the liquid inlet forms a receiving space for completely accommodating the sliding sleeve after the breakable component is broken, so that the liquid inlet can be opened.
[0010] The lower end of the tubular body has a hemispherical surface for mating with the tube ball seat.
[0011] Furthermore, the sliding sleeve is provided with a tapered hole for matching the impact rod, and the internal flow channel of the tapered hole constitutes at least a part of the flow channel.
[0012] Furthermore, the slide is provided with a ball seat for matching the drop ball, and the internal flow channel of the ball seat constitutes at least a part of the flow channel.
[0013] Furthermore, the one-way valve includes a limiting ball cover, a cooperating inner ball, and an inner ball seat. The limiting ball cover is fixedly connected to the tubular body, and the limiting ball cover has a connecting hole that penetrates the limiting ball cover in the vertical direction. The inner ball is located between the limiting ball cover and the inner ball seat. The diameter of the connecting hole is smaller than the diameter of the inner ball. The space between the sliding sleeve and the limiting ball cover satisfies the following condition: before the destructible part is destroyed, the distance between the sliding sleeve and the limiting ball cover is greater than the height of the sliding sleeve, so as to form the aforementioned receiving space.
[0014] Furthermore, the upper surface of the limiting ball cover forms a support surface for supporting the sliding sleeve after the destructible component is damaged.
[0015] Furthermore, multiple connecting holes are arranged at intervals.
[0016] Furthermore, the tubular body includes a connecting pipe, an inner pipe, an outer pipe, and a connecting seat. The upper ends of the inner pipe and the outer pipe are fixedly connected to the connecting pipe, and the lower end of the outer pipe is fixedly connected to the connecting seat. The inner pipe is provided with a drain hole that runs radially through the inner pipe. The space enclosed by the inner pipe, the outer pipe, and the connecting seat, together with the drain hole, constitutes the drain channel.
[0017] Furthermore, the upper opening of the connecting pipe is a flared shape, wider at the top and narrower at the bottom.
[0018] Furthermore, a first sealing ring and a second sealing ring are provided between the outer peripheral surface of the sliding sleeve and the inner wall surface of the tubular body forming the central flow channel. The first sealing ring and the second sealing ring are located on the upper and lower sides of the liquid inlet, respectively.
[0019] Furthermore, the destructible component is a shear pin.
[0020] The beneficial effects of the drainable tube tester provided by this utility model are as follows: This utility model is a pioneering invention. In this utility model, a one-way valve is used to achieve pressure tube testing. By setting a bypass drain channel and using a sliding sleeve switch (the sliding sleeve, the destructible component, and the tubular body together constitute the sliding sleeve switch) to open and close the liquid inlet of the drain channel, the drain channel can be opened for liquid drainage when needed.
[0021] To facilitate understanding by those skilled in the art, the beneficial effects of this utility model will be described below in conjunction with specific usage conditions.
[0022] When the drainable tube tester is dropped into the oil pipe, the liquid can flow upward through the check valve, so that the drainable tube tester can fall smoothly onto the tester ball seat.
[0023] During pipe testing (i.e., to verify whether the tubing is leaking), pressure is applied directly from the wellhead into the tubing, the check valve is closed, and the tubing is pressurized, thus achieving pipe testing under pressure.
[0024] During the draining process, the destructible component is broken, the sliding sleeve switch is opened, and the sliding sleeve descends into the containment space to allow the inlet to leak out. The liquid in the tubing is drained through the drain channel to the central channel below the check valve, thereby draining the liquid into the well. This avoids pulling the tubing string with liquid in it, effectively reducing the labor intensity and operating costs of workers, and there is no problem of liquid flowing to the surface and polluting the environment.
[0025] It should be noted that, due to the presence of the check valve, during normal production, when formation fluid is transported from the formation to the wellhead, the check valve opens to ensure normal production. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the structure of a drainable tube tester during tube testing.
[0027] Figure 2 This is a schematic diagram of the structure of a drainable tube tester during drainage.
[0028] Explanation of reference numerals in the attached figures:
[0029] 1. Connecting pipe; 2. Outer pipe; 3. Sliding sleeve; 3-1. Flow channel; 4. Inner pipe; 4-1. Inner ball seat; 4-2. Drain hole; 5. Limiting ball cover; 5-1. Connecting hole; 6. Inner ball; 7. Connecting seat; 7-1. Central through hole; 8. Sealing ring; 9. Shear pin; 10. Drain annulus; 11. Inspection ball seat; 12. Impact rod. Detailed Implementation
[0030] To address the problems in the background technology, the core inventive concept of this utility model is as follows: by setting a single-flow valve to ensure that the drainable tube tester can be normally deployed and pressurized for tube testing, and by setting a bypass drain channel and a sliding sleeve switch, the drain channel can be opened to drain during drainage, thus avoiding the tube string being lifted while liquid is present.
[0031] The present invention will be further described in detail below with reference to embodiments of the drainable tube tester.
[0032] like Figures 1-2As shown, the drainable tube tester includes a tubular body extending vertically. The tubular body has a central flow channel and a bypass drain channel. The drain channel has an inlet and an outlet connected to the central flow channel, with the inlet located above the outlet. A sliding sleeve 3 is provided inside the central flow channel, and a check valve is configured in the central flow channel for allowing liquid to flow unidirectionally from bottom to top. The check valve is located between the inlet and the outlet. The sliding sleeve 3 has a flow channel 3-1 that runs vertically through the sliding sleeve 3. The sliding sleeve 3 is installed on the tubular body by a destructible element and is used to block the inlet. The portion of the central flow channel located below and adjacent to the inlet forms a receiving space for completely accommodating the sliding sleeve 3 after the destructible element is destroyed, thereby opening the inlet. The lower end of the tubular body has a hemispherical surface for cooperating with the tube tester ball seat 11.
[0033] The check valve can be any type of check valve in existing technology. It can open during normal production to allow formation fluid to flow upwards and close during pressurization testing to allow for pressure buildup. The destructible component can be a shear pin 9, a snap ring, or a shear ring, all commonly used in oilfields. The shear pin 9 passes through both the tubular body and the sliding sleeve 3 to form a sliding sleeve switch. Alternatively, both the inner surface of the tubular body and the outer surface of the sliding sleeve 3 have annular grooves, and the snap ring (shear ring) is engaged in both annular grooves to form a sliding sleeve switch. Figure 1 In the illustrated embodiment, the lower end of the tubular body has a hemispherical head, and the hemispherical surface of the hemispherical head forms a hemispherical surface for cooperating with the tube ball seat 11. In other embodiments, the lower end of the tubular body may also have a 3 / 4 ball head, and a portion of the 3 / 4 ball surface of the 3 / 4 ball head forms a hemispherical surface for cooperating with the tube ball seat 11. Therefore, the lower end of the tubular body may also be an n-ball head, where 1 ≥ n > 1 / 2, and a portion of the n-ball head's spherical surface forms a hemispherical surface for cooperating with the tube ball seat 11.
[0034] It should be noted that the test tube ball seat 11 is part of the tubing string, not part of the drainable test tube. The test tube ball seat 11 can be installed on a short section, the upper and lower ends of which are threaded to the connecting tubing.
[0035] To facilitate understanding by those skilled in the art, the beneficial effects of this utility model will be described below in conjunction with specific usage conditions.
[0036] When the drainable tube tester is inserted into the oil pipe, the liquid can flow upward through the check valve, so that the drainable tube tester can fall smoothly onto the tester ball seat 11.
[0037] During pipe testing (i.e., to verify whether the tubing is leaking), pressure is applied directly from the wellhead into the tubing, the check valve is closed, and the tubing is pressurized, thus achieving pipe testing under pressure.
[0038] During the draining process, the destructible component is broken, the sliding sleeve switch is opened, and the sliding sleeve 3 descends into the containment space to allow the inlet to leak out. The liquid in the tubing is drained through the drain channel to the central channel below the check valve, thereby draining the liquid into the well and avoiding the need to pull the tubing string with liquid in it. This effectively reduces the labor intensity and operating costs of workers, and there is no problem of liquid flowing to the surface and polluting the environment.
[0039] It should be noted that, due to the presence of the check valve, during normal production, when formation fluid is transported from the formation to the wellhead, the check valve opens to ensure normal production. Therefore, the deployment of the drainable pipe tester is flexible and does not affect normal production.
[0040] exist Figure 2 In the embodiment shown, the sliding sleeve 3 is provided with a tapered hole for matching the impact rod 12, and the internal flow channel of the tapered hole forms part of the flow channel 3-1.
[0041] In other embodiments, the internal flow channels of the tapered orifice may also constitute the entire flow channel 3-1.
[0042] like Figure 2 As shown, when you want to open the drain channel, you only need to use a steel wire to lower the impact rod 12 and make the impact rod 12 hit the sliding sleeve 3, thereby breaking the shear pin 9 (destructible part), and the sliding sleeve 3 moves down and opens the liquid inlet of the drain channel.
[0043] In other embodiments, the slide 3 is provided with a ball seat for matching the ball, the internal flow channel of the ball seat forming part of the flow channel 3-1, or the internal flow channel of the ball seat forming the entire flow channel 3-1.
[0044] When you want to open the drain channel, first, drop the ball into the tubing. The ball will sit on the ball seat. Then, pressurize the tubing from the wellhead to break the shear pin 9 (the destructible part). The sliding sleeve 3 will then descend and open the inlet of the drain channel.
[0045] exist Figures 1-2 In the illustrated embodiment, the check valve is a ball-type check valve. The check valve includes a limiting ball cover 5, a cooperating inner ball 6, and an inner ball seat 4-1. The limiting ball cover 5 is fixedly connected to the tubular body, and the limiting ball cover 5 is provided with a connecting hole 5-1 that penetrates the limiting ball cover 5 in the vertical direction. The inner ball 6 is located between the limiting ball cover 5 and the inner ball seat 4-1. The diameter of the connecting hole 5-1 is smaller than the diameter of the inner ball 6. The space between the sliding sleeve 3 and the limiting ball cover 5 satisfies the following condition: before the destructible part is destroyed, the distance between the sliding sleeve 3 and the limiting ball cover 5 is greater than the height of the sliding sleeve 3, so as to form the aforementioned receiving space.
[0046] The outer surface of the limiting ball cover 5 is provided with external threads, and the inner surface of the tubular body is provided with corresponding internal threads. The limiting ball cover 5 is threadedly connected to the tubular body. Of course, the limiting ball cover 5 and the tubular body can also be fixedly connected by welding or pinning. The limiting ball cover 5 and the inner ball seat 4-1 are used to limit the position of the inner ball 6. The inner ball 6 and the inner ball seat 4-1 cooperate to achieve the single-flow function.
[0047] Preferred, in Figures 1-2 In the embodiment shown, multiple (three, four or more) connecting holes 5-1 are arranged at intervals to increase the flow area.
[0048] In other embodiments, the number of connecting holes 5-1 may also be one or two.
[0049] In other embodiments, the check valve may also be an existing baffle check valve (gate check valve), swing check valve, or lift check valve (plunger check valve), which will not be described in detail here.
[0050] In a preferred embodiment, the upper surface of the limiting ball cover 5 forms a support surface for supporting the sliding sleeve 3 after the destructible component is damaged, resulting in a simple structure.
[0051] In other embodiments, an annular protrusion is provided on the inner surface of the tubular body, which is used to support the sliding sleeve 3.
[0052] exist Figures 1-2 In the embodiment shown, a first sealing ring and a second sealing ring (i.e., sealing ring 8) are provided between the outer peripheral surface of the sliding sleeve 3 and the inner wall surface of the tubular body forming the central flow channel. The first sealing ring and the second sealing ring are located on the upper and lower sides of the liquid inlet, respectively, thereby improving the airtightness between the sliding sleeve 3 and the tubular body and preventing leakage between the sliding sleeve 3 and the tubular body.
[0053] In other embodiments, the sliding sleeve 3 is clearance-fitted with the tubular body to achieve a seal, in which case a liquid surface tension valve is formed between the sliding sleeve 3 and the inner surface of the tubular body.
[0054] The following combination Figures 1-2 The specific structure of the tubular main body is described.
[0055] exist Figures 1-2 In the embodiment shown, the tubular body includes a connecting pipe 1, an inner pipe 4, an outer pipe 2, and a connecting seat 7. The upper ends of the inner pipe 4 and the outer pipe 2 are fixedly connected to the connecting pipe 1, and the lower end of the outer pipe 2 is fixedly connected to the connecting seat 7. The inner pipe 4 is provided with a drain hole 4-2 that runs radially through the inner pipe 4. The space enclosed by the inner pipe 4, the outer pipe 2, and the connecting seat 7, together with the drain hole 4-2, constitutes the drain channel. The hemispherical surface is part of the connecting seat 7.
[0056] The inner tube 4 has an external thread at its upper end, the outer tube 2 has an internal thread at its upper section and an external thread at its lower end, the connecting tube 1 has both an internal thread and an external thread at its lower end, the connecting seat 7 has an internal thread at its upper end, the connecting tube 1 is threaded to the inner tube 4, and the upper and lower ends of the outer tube 2 are threaded to the connecting tube 1 and the connecting seat 7, respectively.
[0057] Of course, in other embodiments, the inner tube 4, outer tube 2, connecting tube 1 and connecting seat 7 can also be fixedly connected by welding or other means.
[0058] In this embodiment, there may be one, two or more drain holes 4-2 arranged circumferentially, and the inlet of the drain hole 4-2 constitutes the liquid inlet of the drain channel; a drain annulus for draining liquid is formed between the inner tube 4 and the outer tube 2; the space between the lower end face of the inner tube 4 and the upper end face of the connecting seat 7 constitutes the drain space, and the connection between the drain space and the central channel constitutes the liquid outlet of the drain channel; the surface of the inner tube 4 constitutes the inner surface of the tubular body, and the internal channel of the inner tube 4, the internal channel of the connecting tube 1 and the central through hole 7-1 on the connecting seat 7 all constitute part of the central channel.
[0059] Preferably, in Figures 1-2 In the embodiment shown, the upper opening of the connecting pipe 1 is a flared mouth that is wider at the top and narrower at the bottom, so that the impact head or the ball can enter the inner pipe 4 through the connecting pipe 1.
[0060] In other embodiments, the flow channel of the connecting pipe 1 can also be a cylindrical flow channel, in which case the upper opening of the connecting pipe 1 is a cylindrical opening.
[0061] In other embodiments, the tubular body can also be integrally formed, with a central flow channel and a C-shaped bypass hole. Both ends of the C-shaped bypass hole are connected to the central flow channel to form the drainage channel, resulting in good overall integrity.
[0062] 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 drainable tube tester, characterized in that, It includes a tubular body extending vertically, the tubular body having a central flow channel and a discharge flow channel, the discharge flow channel having an inlet and an outlet connected to the central flow channel, and the inlet being located above the outlet. The central flow channel is equipped with a sliding sleeve and a check valve for allowing liquid to flow unidirectionally from bottom to top. The check valve is located between the inlet and the outlet. The sliding sleeve has a flow channel that runs through the sliding sleeve in the vertical direction. The sliding sleeve is installed on the tubular body by a breakable component and is used to block the liquid inlet. The central flow channel located below and adjacent to the liquid inlet forms a receiving space for completely accommodating the sliding sleeve after the breakable component is broken, so that the liquid inlet can be opened. The lower end of the tubular body has a hemispherical surface for mating with the tube ball seat.
2. The drainable tube tester as described in claim 1, characterized in that, The sliding sleeve is provided with a tapered hole for matching the impact rod, and the internal flow channel of the tapered hole constitutes at least a part of the flow channel.
3. The drainable tube tester as described in claim 1, characterized in that, The slide has a ball seat for matching the ball, and the internal flow channel of the ball seat forms at least a part of the flow channel.
4. The drainable tube tester as described in any one of claims 1 to 3, characterized in that, The one-way valve includes a limiting ball cover, an inner ball and an inner ball seat that cooperate with each other. The limiting ball cover is fixedly connected to the tubular body and has a connecting hole that runs through the limiting ball cover in the vertical direction. The inner ball is located between the limiting ball cover and the inner ball seat. The diameter of the connecting hole is smaller than the diameter of the inner ball. The space between the sliding sleeve and the limiting ball cover satisfies the following condition: before the destructible part is destroyed, the distance between the sliding sleeve and the limiting ball cover is greater than the height of the sliding sleeve, so as to form the aforementioned receiving space.
5. The drainable tube tester as described in claim 4, characterized in that, The upper surface of the limiting ball cover forms a support surface for supporting the sliding sleeve after the destructible part is damaged.
6. The drainable tube tester as described in claim 4, characterized in that, Multiple connecting holes are arranged at intervals.
7. The drainable tube tester as described in any one of claims 1 to 3, characterized in that, The tubular body includes a connecting pipe, an inner pipe, an outer pipe, and a connecting seat. The upper ends of the inner pipe and the outer pipe are fixedly connected to the connecting pipe, and the lower end of the outer pipe is fixedly connected to the connecting seat. The inner pipe is provided with a drain hole that runs radially through the inner pipe. The space enclosed by the inner pipe, the outer pipe, and the connecting seat, together with the drain hole, constitutes the drain channel.
8. The drainable tube tester as described in claim 7, characterized in that, The upper opening of the connecting pipe is a flared shape, wider at the top and narrower at the bottom.
9. The drainable tube tester as described in any one of claims 1 to 3, characterized in that, A first sealing ring and a second sealing ring are provided between the outer peripheral surface of the sliding sleeve and the inner wall surface of the tubular body forming the central flow channel. The first sealing ring and the second sealing ring are located on the upper and lower sides of the liquid inlet, respectively.
10. The drainable tube tester as described in any one of claims 1 to 3, characterized in that, The destructible component is a shear nail.