Gas lift flowback device

Abstract

The utility model discloses a gas lift flowback device, which belongs to the technical field of gas lift flowback, and comprises a hollow pipe I and a hollow pipe II which are connected with each other, a plurality of air holes are formed in the inner wall of one end, close to the hollow pipe II, of the hollow pipe I, a ventilation component is fixedly arranged in each air hole, and protection components are arranged in the hollow pipe I and the hollow pipe II. The protection assembly comprises a protection pipe A and a protection pipe B. An annular groove is machined in the inner wall of the side, close to the protection pipe B, of the protection pipe A. A filtering assembly is detachably connected into the annular groove and comprises an arc-shaped filtering plate used for preventing the ventilation assembly from being blocked. Impurities in liquid are filtered through the arc-shaped filter plate on the annular plate, the situation that the liquid impurities block the valve ball seat and the arc-shaped opening and affect normal operation of gas-lift flowback work is avoided, and when high-pressure nitrogen is introduced for gas-lift flowback work, the high-pressure nitrogen can drive the liquid to flow and separate the impurities attached to the arc-shaped filter plate, so that the gas-lift flowback work is guaranteed. And manual cleaning is not needed.

Description

Technical Field

[0001] This utility model relates to the field of air lift return technology and belongs to an air lift return device. Background Technology

[0002] Gas lift flowback is a commonly used technology in oil and gas extraction and drilling, primarily used to remove fluids such as drilling fluid and fracturing fluid from the wellbore to improve oil and gas production efficiency. Gas lift flowback units are widely used equipment in fields such as oil extraction. They mainly utilize the energy of high-pressure gas to lift fluids from the well to the surface. The basic principle is to inject high-pressure gas into the wellbore, reducing the density of the fluid and causing it to be lifted by the buoyancy of the gas. For example, in oil well production, when fluid accumulation occurs and affects normal production, gas lift flowback units can effectively remove the accumulated fluid and restore the well's production capacity.

[0003] Existing gas lift return systems generally include components such as a hydraulic compressor, a gas dispenser, a CNG tanker, a natural gas well group, a gas-liquid separator skid, and a main pipeline for the well group. For example, a gas lift return system with prior art disclosure number CN209100010U includes an upper body and a lower body. An upper connector is connected to the upper body, and a lower connector is connected to the lower body. The side wall of the lower body has a gas hole, and a valve ball seat is installed inside the gas hole. The valve ball seat communicates with the gas hole, and a valve ball is connected inside the valve ball seat.

[0004] However, the above-mentioned existing technology still has the following problems when used: Since the well fluid may contain impurities, sand particles and other substances, these impurities are easy to block the valve ball seat when the fluid flows, causing the valve ball in the valve ball seat to be unable to open, which will affect the subsequent ventilation and gas lift return operation. Based on this, the present invention provides a gas lift return device with anti-clogging function. Utility Model Content

[0005] Therefore, this utility model provides an air lift return device to solve the problem in the prior art that the well fluid may contain impurities, sand particles and other substances, which can easily clog the valve ball seat during flow and affect subsequent air supply for air lift return.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A pneumatic lift return device includes a hollow tube 1 and a hollow tube 2 connected to each other. The inner wall of the hollow tube 1 near the end of the hollow tube 2 is machined with a plurality of air holes. Each air hole is fixedly provided with a ventilation component. Both the hollow tube 1 and the hollow tube 2 are provided with a protective component. The protective component includes a protective tube A and a protective tube B. The inner wall of the protective tube A near the side of the protective tube B is machined with an annular groove. A filter component is detachably connected to the annular groove by bolts. The filter component includes an arc-shaped filter plate to prevent the ventilation component from being blocked.

[0008] Furthermore, the filter assembly also includes a ring plate, which is detachably fixed in an annular groove, and at least one arc-shaped opening is provided on both the ring plate and the protective tube A for communication between the valve ball seat and the protective tube A and the protective tube B.

[0009] Furthermore, the number of arc-shaped filter plates is set to be the same as the number of arc-shaped openings, and the arc-shaped filter plates are detachably installed in the arc-shaped openings on the ring plate, so that the liquid can pass through the arc-shaped filter plates and the arc-shaped openings, while the arc-shaped filter plates filter impurities in the liquid at the arc-shaped openings.

[0010] Furthermore, both hollow tube one and hollow tube two have annular mounting grooves on their opposite sides, and protective tube A and protective tube B are respectively inserted into the two annular mounting grooves. Protective tube A is detachably connected to hollow tube one, and protective tube B is detachably connected to hollow tube two by multiple bolts.

[0011] Furthermore, the hollow tube one, hollow tube two, protective tube A, protective tube B, ring plate and arc-shaped filter plate are all made of nickel-based alloy. Nickel-based alloy has excellent high temperature resistance and corrosion resistance, which can prevent the corrosion and damage of hollow tube one, hollow tube two, protective tube A, protective tube B, ring plate and arc-shaped filter plate, thereby ensuring the normal operation of the air lift return device.

[0012] Furthermore, the ventilation assembly includes a valve ball seat, which is fixed inside the vent. Each valve ball seat is connected to a valve block for sealing the valve ball seat and preventing liquid leakage.

[0013] Furthermore, the hollow tube one and hollow tube two form an annular groove on one side of each other. This annular groove is connected to the air hole and the arc-shaped opening, which facilitates the rapid flow of high-pressure nitrogen into the liquid and its mixing with the liquid.

[0014] Furthermore, each vent is connected to a compressed air connector, and the compressed air connector is connected to the vent and the valve ball seat.

[0015] Furthermore, a rubber sealing ring 1 is provided between the protective tube A and the protective tube B to improve their sealing performance, and two rubber sealing rings 2 are provided between the hollow tube 1 and the hollow tube 2 to improve their sealing performance.

[0016] This utility model has the following advantages:

[0017] 1. This utility model filters impurities in liquid through an arc-shaped filter plate on a ring plate, preventing liquid impurities from clogging the valve ball seat and arc-shaped opening, thus affecting the normal operation of the air lift return process. Furthermore, when high-pressure nitrogen is introduced for air lift return, the high-pressure nitrogen can drive the liquid flow and remove the impurities adhering to the arc-shaped filter plate, eliminating the need for manual cleaning.

[0018] 2. The installation of hollow tube one and hollow tube two provides protection to the inner walls of hollow tube one and hollow tube two. The removal of protective tube A and protective tube B facilitates cleaning and replacement, and also facilitates the removal and replacement of the arc-shaped filter plate. Attached Figure Description

[0019] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0021] Figure 1 A schematic diagram of the overall structure of this utility model;

[0022] Figure 2 These are cross-sectional views of hollow tube one and hollow tube two provided by this utility model;

[0023] Figure 3 Cross-sectional views of hollow tube 1, hollow tube 2, protective tube A and protective tube B provided for this utility model;

[0024] Figure 4 The structural diagram of the protective tube A and the filter assembly provided by this utility model;

[0025] Figure 5 A cross-sectional view of the hollow tube provided by this utility model.

[0026] In the diagram: 1. Hollow tube one; 2. Hollow tube two; 3. Air vent; 4. Ventilation assembly; 5. Protective assembly; 6. Filter assembly; 7. Annular mounting groove; 8. Annular recess; 9. Compressed air connector; 10. Rubber sealing ring one; 11. Rubber sealing ring two;

[0027] 401. Versailles ball stand; 402. Versailles ball block;

[0028] 501. Protective tube A; 502. Protective tube B; 503. Annular groove;

[0029] 601. Arc-shaped filter plate; 602. Ring plate; 603. Arc-shaped opening. Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] Refer to the instruction manual appendix Figure 1-5 This utility model provides an air-lift backflow device, including a hollow tube 1 and a hollow tube 2 connected to each other. Multiple air holes 3 are machined on the inner wall of the hollow tube 1 near the hollow tube 2. Each air hole 3 has a fixed ventilation component 4 inside. Specifically, the ventilation component 4 includes a valve seat 401, which is fixed inside the air hole 3. Each valve seat 401 is connected to a valve block 402 for sealing the valve seat 401 and preventing liquid leakage. Specifically, the valve seat 401 provides support and a sealing surface for the valve block 402. The valve block 402 sits on the valve seat 401 to prevent liquid backflow. Removing the valve block 402 from the valve seat 401 allows liquid to flow.

[0032] Hollow tube 1 and hollow tube 2 are close to each other to form an annular groove 8. The annular groove 8 is connected to the air hole 3 and the arc-shaped opening 603, which facilitates the rapid flow of high-pressure nitrogen into the liquid and its mixing with the liquid.

[0033] Each vent 3 is internally connected to a compressed air connector 9, and the compressed air connector 9 is connected to the vent 3 and the valve ball seat 401 for connecting to a nitrogen compression and delivery device.

[0034] Both hollow tube 1 and hollow tube 2 are equipped with protective components 5. The protective components 5 include protective tube A501 and protective tube B502. The inner wall of protective tube A501 near protective tube B502 is machined with an annular groove 503. The annular groove 503 is detachably connected to a filter component 6 by bolts. The filter component 6 includes an arc-shaped filter plate 601, which is used to prevent the ventilation component 4 from being blocked.

[0035] The filter assembly 6 also includes a ring plate 602, which is detachably fixed in an annular groove 503. At least one arc-shaped opening 603 is provided on both the ring plate 602 and the protective tube A501 for communication between the valve ball seat 401 and the protective tube A501 and the protective tube B502.

[0036] The number of arc-shaped filter plates 601 is set to be the same as the number of arc-shaped openings 603, and the arc-shaped filter plates 601 are detachably installed in the arc-shaped openings 603 on the ring plate 602, so that the liquid can pass through the arc-shaped filter plates 601 and the arc-shaped openings 603, while the arc-shaped filter plates 601 filter the impurities in the liquid at the arc-shaped openings 603.

[0037] Hollow tube 1, hollow tube 2, protective tube A501, protective tube B502, ring plate 602, and arc-shaped filter plate 601 are all made of nickel-based alloy. Nickel-based alloy has excellent high temperature resistance and corrosion resistance, which can prevent the corrosion and damage of hollow tube 1, hollow tube 2, protective tube A501, protective tube B502, ring plate 602, and arc-shaped filter plate 601, thereby ensuring the normal operation of the air lift return device.

[0038] In use, first, firmly fix hollow tube 1 and hollow tube 2 together, then connect them to the acidizing tubing string. During normal acidizing, the valve ball 402 inside each valve ball seat 401 is sealed inside the valve ball seat 401 by the liquid. After the acidizing well is shut in, use a nitrogen compression and delivery device to deliver high-pressure nitrogen to the vent 3. The high-pressure nitrogen enters the valve ball seat 401 through the vent 3, pushes open the valve ball 402, and then mixes with the liquid in the protective tube A501 and protective tube B502 through the annular groove 8. High-pressure nitrogen can reduce the density of the liquid, thereby enabling liquid gas lift backflow and gradually emptying the liquid in the acidification column. During use, the arc-shaped filter plate 601 on the ring plate 602 can filter impurities at the arc-shaped groove, preventing impurities in the liquid from clogging the valve ball seat 401 and the arc-shaped opening 603, thus affecting the normal operation of subsequent gas lift backflow. Moreover, when high-pressure nitrogen is introduced, the liquid flows due to the high-pressure nitrogen, and the flowing liquid can remove impurities adhering to the arc-shaped filter plate 601, eliminating the need for manual cleaning.

[0039] Refer to the instruction manual appendix Figure 1-5Hollow tube 1 and hollow tube 2 are each provided with annular mounting grooves 7 on opposite sides. Protective tube A501 and protective tube B502 are respectively inserted into the two annular mounting grooves 7. Protective tube A501 and hollow tube 1, and protective tube B502 and hollow tube 2 are detachably connected by multiple bolts.

[0040] After use, first remove hollow tube 1 and hollow tube 2 from the acidification column, then loosen the bolts on protective tube A501 and protective tube B502, and then remove protective tube A501 and protective tube B502 from hollow tube 1 and hollow tube 2 respectively, and replace protective tube A501 and protective tube B502. This also facilitates the replacement of the arc-shaped filter plate 601.

[0041] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A pneumatic lift return device, comprising a hollow tube one (1) and a hollow tube two (2) connected to each other, wherein a plurality of air holes (3) are machined on the inner wall of the hollow tube one (1) near the hollow tube two (2), and each air hole (3) is fixedly provided with a ventilation component (4), characterized in that: Both the hollow tube one (1) and the hollow tube two (2) are equipped with protective components (5); The protective component (5) includes a protective tube A (501) and a protective tube B (502). The inner wall of the protective tube A (501) near the protective tube B (502) is machined with an annular groove (503). A filter component (6) is detachably connected inside the annular groove (503). The filter assembly (6) includes an arc-shaped filter plate (601) for preventing the ventilation assembly (4) from becoming blocked.

2. The air-lift return device according to claim 1, characterized in that: The filter assembly (6) further includes a ring plate (602), which is detachably fixed in an annular groove (503), and at least one arc-shaped opening (603) is provided on both the ring plate (602) and the protective tube A (501).

3. The air lift return device according to claim 2, characterized in that: The number of arc-shaped filter plates (601) is set to be the same as the number of arc-shaped openings (603), and the arc-shaped filter plates (601) are detachably installed in the arc-shaped openings (603) on the ring plate (602).

4. The air-lift return device according to claim 1, characterized in that: Both hollow tube one (1) and hollow tube two (2) have annular mounting grooves (7) on opposite sides. Protective tube A (501) and protective tube B (502) are respectively inserted into the two annular mounting grooves (7). Protective tube A (501) is detachably connected to hollow tube one (1), and protective tube B (502) is detachably connected to hollow tube two (2).

5. The air-lift return device according to claim 2, characterized in that: The hollow tube one (1), hollow tube two (2), protective tube A (501), protective tube B (502), ring plate (602) and arc-shaped filter plate (601) are all made of nickel-based alloy.

6. The air-lift return device according to claim 1, characterized in that: The ventilation assembly (4) includes a valve ball seat (401), which is fixed inside the air hole (3), and each valve ball seat (401) is connected to a valve block (402).

7. The air-lift return device according to claim 2, characterized in that: The hollow tube one (1) and the hollow tube two (2) form an annular groove (8) on the side close to each other. The annular groove (8) is connected to the air hole (3) and the arc-shaped opening (603).

8. The air-lift return device according to claim 2, characterized in that: Each air hole (3) is connected to a compressed air connector (9), and the compressed air connector (9) is connected to the air hole (3) and the valve ball seat (401).

9. The air-lift return device according to claim 1, characterized in that: A rubber sealing ring 1 (10) is provided between the protective tube A (501) and the protective tube B (502) to improve their sealing performance, and two rubber sealing rings 2 (11) are provided between the hollow tube 1 (1) and the hollow tube 2 (2) to improve their sealing performance.

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