Check valve coring device

Abstract

The utility model relates to the technical field of oil-water well wellhead check valve maintenance, in particular to a check valve coring device. The check valve coring device comprises a supporting cylinder, a connecting structure used for being fixedly connected with an outer cylinder of the check valve is arranged on the supporting cylinder, a lead screw movably penetrates through the supporting cylinder in the axial direction of the supporting cylinder, the lower end of the lead screw is used for being in threaded connection with a threaded hole of a valve element of the check valve, and a driving nut is screwed on the lead screw and pressed downwards on the supporting cylinder in the axial direction. The lower end of the lead screw can be in threaded connection with the check valve element, a driving nut is screwed on the lead screw, and the lead screw can be driven to move upwards by rotating the driving nut, so that the check valve element is brought out of the check valve outer cylinder, and coring operation is achieved. The lower end of the lead screw of the coring device for the check valve extends into the threaded hole of the valve core of the check valve and is in threaded connection with the threaded hole, and the coring device can be suitable for coring operation of the check valve with the valve core integrally located in the outer cylinder of the check valve and a certain distance away from the upper end face of the outer cylinder of the check valve.

Description

Technical Field

[0001] This utility model relates to the field of maintenance technology for one-way valves at the wellhead of oil and water wells, and in particular to a one-way valve core sampling device. Background Technology

[0002] During the production process of electric submersible pump wells in oilfields, when the pump stops due to malfunction or other reasons, a check valve needs to be installed at the wellhead to prevent the produced fluid from flowing back into the wellbore. However, because the produced fluid contains a lot of impurities, the check valve will become clogged with dirt or impurities after a period of use, so the valve core needs to be removed periodically for cleaning and maintenance.

[0003] Currently, there are two main methods for core removal during maintenance: one is to use electric welding to cut and replace the entire valve core, but the high temperature of electric welding can easily damage the sealing ring of the check valve, rendering it unusable; the other is to connect a screw to the top female thread of the valve core and use auxiliary tools such as screwdrivers, pipe wrenches, and hammers to pull out and replace the check valve core. These existing methods require multiple people to work together, and the removal process is time-consuming, labor-intensive, and inefficient.

[0004] Chinese utility model patent CN205297463U discloses a valve core puller for a check valve. The puller includes a support cylinder, a rotating arm, and a lead screw. A bearing is embedded in the front end of the support cylinder, and a steel sleeve is fitted inside the bearing. The front end of the steel sleeve extends outside the support cylinder. The rotating arm is fixedly connected to the front end of a cylinder liner. The inner wall of the steel sleeve has internal threads. The lead screw passes through the steel sleeve and is threaded to it. A connector is located at the bottom of the lead screw, with a pin hole for inserting a pin. The connector is used for detachable connection with the check valve core. A through groove is provided on the side wall of the support cylinder, allowing a hand to reach in. In application, the support cylinder is installed on the outer cylinder of the check valve. Maintenance personnel reach into the support cylinder and insert a pin through the pin hole on the connector and the through hole on the check valve core, achieving a detachable connection between the connector and the check valve core. Then, by rotating the rotating arm, the lead screw moves axially within the support cylinder, completely pulling the check valve core out of the check valve outer cylinder.

[0005] Existing pullers require a fixed connection between the lead screw's bottom connector and the check valve core. Therefore, they are only suitable for check valves with a core extending beyond the outer cylinder and having a through-hole. However, many different check valve models are used at different oil and water wellheads. For some models, the valve core is entirely inside the outer cylinder and at a distance from its upper surface. Instead of a through-hole, the valve core has a threaded hole at its upper center. A plug is connected to the upper end of the outer cylinder. Removing the plug prevents the lead screw's bottom connector from being fixedly connected to the valve core, rendering the existing puller unsuitable for this type of check valve and preventing core extraction. Utility Model Content

[0006] The purpose of this utility model is to provide a single-flow valve core extraction device to solve the problem that the existing single-flow valve core extractor cannot be used for single-flow valves with a structure in which the entire valve core is inside the outer cylinder of the single-flow valve and there is a certain distance between the valve core and the upper end face of the outer cylinder of the single-flow valve.

[0007] The present invention adopts the following technical solution:

[0008] A one-way valve core extraction device includes a support cylinder with a connection structure for fixed connection with the outer cylinder of the one-way valve. A lead screw is movably mounted on the support cylinder along its axial direction. The lower end of the lead screw is threaded to the threaded hole of the one-way valve core. A drive nut is screwed on the lead screw and presses down on the support cylinder along its axial direction.

[0009] Furthermore, the support cylinder includes a cylinder body and a bracket portion connected to the upper part of the cylinder body. The cylinder body is provided with the aforementioned connection structure, and the lead screw is movably mounted on the bracket portion, with the drive nut pressing down on the bracket portion.

[0010] Furthermore, the support section is a "gate" shaped support, with the two longitudinal beams of the "gate" shaped support fixedly connected to the cylindrical body section, and a longitudinally extending through hole provided in the middle of the crossbeam, through which the lead screw is movably inserted.

[0011] Furthermore, the cylinder and the support structure are integrated into one piece.

[0012] Furthermore, a washer is provided between the drive nut and the bracket portion.

[0013] Furthermore, a clamping nut is screwed onto the lead screw, which is used to clamp the valve core of the check valve.

[0014] Furthermore, the support cylinder is provided with a threaded structure for threaded connection with the outer cylinder of the single-flow valve, and the threaded structure constitutes the connection structure.

[0015] Furthermore, the support cylinder is equipped with an operating structure for human operation to drive the support cylinder to rotate.

[0016] Furthermore, the operating structure is a rotating handle, which is fixedly connected to the support cylinder near the lower end.

[0017] Furthermore, there are two rotary handles arranged symmetrically about the axis of the support cylinder.

[0018] Beneficial Effects: This utility model is a pioneering invention. The support cylinder is fixedly connected to the outer cylinder of the check valve via a connecting structure. A lead screw is movably mounted on the support cylinder along its axial direction. The lower end of the lead screw is threaded into the threaded hole of the check valve core, achieving a fixed connection between the lead screw and the check valve core. A drive nut is screwed onto the lead screw, pressing it downwards along the axial direction onto the support cylinder. By rotating the drive nut, the lead screw can be moved upwards, thereby bringing the check valve core out of the check valve outer cylinder, realizing the core removal operation. In this utility model, the lower end of the lead screw in the check valve core removal device extends into the threaded hole of the check valve core, and the two are threadedly connected. This design is suitable for core removal operations of check valves where the valve core is entirely inside the check valve outer cylinder and there is a certain distance between it and the upper surface of the check valve outer cylinder. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the single-flow valve core sampling device of this utility model when it is not connected to the single-flow valve;

[0020] Figure 2 This is a schematic diagram of the structure of the single-flow valve core sampling device after it is connected to the outer cylinder of the single-flow valve;

[0021] In the diagram: 1. Lead screw; 2. Drive nut; 3. Washer; 4. Support cylinder; 4-1. Bracket part; 4-2. Cylinder part; 4-3. Internal thread; 5. Clamping nut; 6. Rotary handle; 7. Check valve core; 7-1. Threaded hole; 8. Check valve outer cylinder; 8-1. External thread. Detailed Implementation

[0022] The single-flow valve core extraction device provided by this utility model is mainly used to solve the problem that existing single-flow valve core pullers cannot be used for single-flow valves with a structure in which the valve core is entirely inside the outer cylinder of the single-flow valve and there is a certain distance between it and the upper end face of the outer cylinder. The basic inventive concept of this utility model is: a lead screw is axially mounted on a support cylinder, the lower end of which can be directly threaded into the threaded hole of the single-flow valve core, and a drive nut is configured on the lead screw. By rotating the drive nut, the lead screw is driven to move upward, thereby bringing the single-flow valve core out of the outer cylinder of the single-flow valve.

[0023] Based on the above inventive concept, the embodiments of this utility model are described in detail below.

[0024] like Figure 1-2As shown, the one-way valve core-taking device includes a support cylinder 4. A lead screw 1 is movably mounted on the support cylinder 4 along its axial direction. The lower end of the lead screw 1 is threaded to the threaded hole 7-1 of the one-way valve core 7. A drive nut 2 is screwed onto the lead screw 1. The drive nut 2 presses down on the support cylinder 4 axially. A washer 3 is provided between the drive nut 2 and the support cylinder 4. Rotating the drive nut 2 can drive the lead screw 1 to move upward. The washer 3 between the drive nut 2 and the support cylinder 4 prevents the drive nut 2 from directly pressing on the support cylinder 4 and causing wear to the support cylinder 4, thus protecting the support cylinder 4. If necessary, the washer 3 can be directly replaced, which is convenient and low-cost. The support cylinder 4 includes a cylinder part 4-2 and a bracket part 4-1 connected to the upper part of the cylinder part 4-2. The cylinder part 4-2 is fixedly connected to the outer cylinder 8 of the one-way valve. The lead screw 1 is movably mounted on the bracket part 4-1, and the drive nut 2 presses down on the bracket part 4-1. The cylindrical body 4-2 is a through-cylinder structure with a threaded structure, specifically an internal thread 4-3. The outer cylinder 8 of the check valve has an external thread 8-1, and the cylindrical body 4-2 is threadedly connected to the outer cylinder 8 of the check valve. The upper part of the support cylinder 4 is designed as a frame structure, which reduces the overall weight and creates a large observation port, allowing maintenance personnel to visually observe whether the lower end of the lead screw 1 is aligned with the threaded hole 7-1 of the check valve core 7. If they are not aligned, the lead screw 1 can be slightly shaken to adjust its position, thereby achieving quick alignment and threaded connection between the lower end of the lead screw 1 and the check valve core 7.

[0025] The support section 4-1 is a "gate"-shaped support. The two longitudinal beams of the "gate"-shaped support are fixedly connected to the cylinder section 4-2. A longitudinally extending through hole is provided in the middle of the crossbeam. The diameter of the through hole is larger than the outer diameter of the lead screw 1 but smaller than the outer diameter of the drive nut 2. The lead screw 1 is movably installed within the through hole, and the drive nut 2 presses down on the crossbeam. The "gate"-shaped support has a simple structure and is easy to manufacture. The "gate"-shaped support itself is a symmetrical structure, and the lead screw 1 is movably installed in the middle of the crossbeam of the "gate"-shaped support, resulting in good overall structural symmetry and stability. The cylinder section 4-2 and the support section 4-1 are an integral structure, making the connection more reliable. The support section 4-1 will not loosen or shift relative to the cylinder section 4-2, thus ensuring that the lead screw 1 will only wobble slightly within the through hole and will not deviate significantly relative to the cylinder section 4-2. This makes it easier to align the lead screw 1 with the threaded hole 7-1 of the single-flow valve core 7.

[0026] A clamping nut 5 is screwed onto the lead screw 1. The clamping nut 5 is located below the crossbeam of the "gate"-shaped bracket and is used to clamp onto the one-way valve core 7. After the lower end of the lead screw 1 is threadedly connected to the one-way valve core 7, rotating the clamping nut 5 causes it to press downwards onto the one-way valve core 7. This further prevents the lead screw 1 from loosening and makes the connection between the lower end of the lead screw 1 and the one-way valve core 7 more reliable.

[0027] The support cylinder 4 is threadedly connected to the outer cylinder 8 of the check valve. To facilitate the fixed connection of the support cylinder 4 to the outer cylinder 8, an operating structure is provided on the support cylinder 4 for manual operation to rotate it. Specifically, the operating structure is a rotary handle 6, which is fixedly connected to the support cylinder 4 near its lower end. The rotary handle 6 is a laterally extending cylindrical rod, with a simple structure that is easy for the hand to grip. Two rotary handles 6 are provided and symmetrically arranged about the axis of the support cylinder 4, allowing for convenient operation with both hands. Of course, one, three, or more rotary handles 6 can also be provided.

[0028] like Figure 2 As shown, after assembling the single-flow valve core sampling device of this utility model, firstly, the support cylinder 4 is threadedly connected to the outer cylinder 8 of the single-flow valve, and the outer cylinder 8 of the single-flow valve itself is fixed at the wellhead; then, the lead screw 1 is rotated to fix the lower end of the lead screw 1 to the threaded hole 7-1 in the middle of the valve core 7 of the single-flow valve; then, the clamping nut 5 is rotated to press it against the upper part of the valve core 7 of the single-flow valve; finally, the drive nut 2 is rotated in the opposite direction to drive the lead screw 1 to move upward, and bring the valve core 7 of the single-flow valve out of the outer cylinder 8 of the single-flow valve, thus completing the core sampling operation.

[0029] The lead screw of this invention, used for core removal of a check valve, has its lower end directly inserted into the threaded hole of the check valve core, forming a threaded connection. Therefore, it is suitable for core removal operations on check valves where the valve core is entirely inside the outer cylinder and at a certain distance from the upper surface of the outer cylinder. The device has a simple structure and facilitates core removal. Furthermore, for certain check valve models where the upper end of the valve core extends beyond the outer cylinder and the valve core has a threaded hole for connecting the lead screw, this device can also be used for core removal operations on those models.

[0030] Of course, this utility model is not limited to the embodiments described above.

[0031] For example, in another embodiment, a support cylinder with a different structure is provided. The support cylinder is a cylindrical structure with a crossbeam at the top of the cylinder. A lead screw is mounted on the crossbeam in the vertical direction and drives the nut to press down on the crossbeam.

[0032] For example, in another embodiment, the support cylinder's bracket portion includes three support legs arranged in an equilateral triangle. Each support leg is L-shaped, with its vertical sides fixedly connected to the cylinder body and its horizontal sides fixedly connected to the outer circumference of the same ring. A lead screw is movably mounted inside the ring, and a drive nut presses down on the ring. The three support legs form a three-point support, making it more robust. Of course, there are many alternative structures for the bracket portion, which will not be listed here.

[0033] For example, in another embodiment, the cylinder portion and the support portion are welded together. In other embodiments, the cylinder portion and the support portion may also be two separate structures, fixed together by bolts.

[0034] For example, in another embodiment, a washer may not be provided between the drive nut and the support frame, and the drive nut may be pressed directly onto the support frame.

[0035] For example, in another embodiment, the lead screw may not be equipped with a clamping nut.

[0036] For example, in another embodiment, the connection structure on the support cylinder for fixed connection with the outer cylinder of the check valve can be adjusted according to the structure of the outer cylinder of the check valve. When the outer cylinder of the check valve is provided with a threaded hole, a bolt mounting hole can also be provided on the cylinder wall of the support cylinder to fix the support cylinder and the outer cylinder of the check valve with bolts. At this time, the bolt mounting hole constitutes a connection structure for connection with the outer cylinder of the check valve.

[0037] For example, in another embodiment, a U-shaped gripping ear is provided on the outer peripheral surface of the support cylinder, which constitutes an operating structure for a person to operate and drive the support cylinder to rotate. One U-shaped gripping ear may be provided, or two or more may be provided.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A single-flow valve core sampling device, characterized in that: It includes a support cylinder, which has a connection structure for fixed connection with the outer cylinder of the check valve. A lead screw is movably mounted on the support cylinder along its axial direction. The lower end of the lead screw is used for threaded connection with the threaded hole of the check valve core. A drive nut is screwed on the lead screw and presses down on the support cylinder along its axial direction.

2. The single-flow valve core sampling device according to claim 1, characterized in that: The support cylinder includes a cylinder body and a bracket part connected to the upper part of the cylinder body. The cylinder body is provided with the connection structure. The lead screw is movably mounted on the bracket part, and the drive nut is pressed down on the bracket part.

3. The single-flow valve core sampling device according to claim 2, characterized in that: The support structure is a "gate" shaped support. The two longitudinal beams of the "gate" shaped support are fixedly connected to the cylindrical body. The middle of the crossbeam has a longitudinally extending through hole, and the lead screw is movably installed in the through hole.

4. The single-flow valve core sampling device according to claim 2 or 3, characterized in that: The cylinder and the support structure are integrated.

5. The single-flow valve core sampling device according to claim 2 or 3, characterized in that: A washer is provided between the drive nut and the bracket part.

6. The single-flow valve core sampling device according to claim 2 or 3, characterized in that: A clamping nut is also screwed onto the lead screw, which is used to clamp the valve core of the check valve.

7. The single-flow valve core sampling device according to claim 1, 2, or 3, characterized in that: The support cylinder is provided with a threaded structure for threaded connection with the outer cylinder of the single-flow valve, and the threaded structure constitutes the connection structure.

8. The single-flow valve core sampling device according to claim 7, characterized in that: The support cylinder is equipped with an operating structure for human operation to drive the support cylinder to rotate.

9. The single-flow valve core sampling device according to claim 8, characterized in that: The operating structure is a rotating handle, which is fixedly connected to the support cylinder near the lower end.

10. The single-flow valve core sampling device according to claim 9, characterized in that: There are two rotating handles, which are arranged symmetrically about the axis of the support cylinder.

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