Gas anchor with more sufficient gas-liquid separation

Abstract

The utility model discloses a gas anchor with more sufficient gas-liquid separation, which comprises an adapter connector, the center of the adapter connector is through, the upper end of the adapter connector is provided with a single connector, and the lower end of the adapter connector is provided with an outer ring connector and an inner ring connector; the outer ring joint is in threaded connection with a first oil pipe, the inner ring joint is in threaded connection with a central pipe, and at least two sieve holes are formed in the first oil pipe; at least one continuous oil pipe unit is arranged at the lower end of the first oil pipe; at least one lengthened central tube is arranged at the lower end of the central tube; and the lower end of the lowermost lengthened central pipe is connected with the cyclone pipe through a third screwed joint. The continuous oil pipe unit and the lengthened central pipe are arranged, gas-liquid separation is sufficient, gas loss is reduced, parts capable of being produced repeatedly are used, the manufacturing cost is low, and the continuous oil pipe is suitable for coal-bed gas wells which are large in gas amount, high in pump hanging, large in well deviation of horizontal wells and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of air anchors, in particular to an air anchor with more complete gas-liquid separation. Background Art

[0002] As development continues, the pump hanging position of the gas well has been continuously lowered, and has basically been lowered to the bottom of the coal seam. Although the lowering of the pump hanging position can further release the gas production potential of the coal seam, the gas anchor will be more susceptible to adsorption by fracturing sand and coal powder, resulting in gas anchor failure; by lifting the pump hanging position to the upper part of the coal seam, although the blockage of fracturing sand and coal powder can be avoided, the gas blowby phenomenon will become serious due to the continuous decrease in submergence, the tubular pump will be affected by the gas and the pump efficiency will be reduced, and the continuous gas production at the wellhead also increases the safety and environmental risks.

[0003] At present, most drainage wells use ordinary air anchors and slit air anchors. The gas-liquid separation effect of this device is poor, the suction port is easily blocked, and the operating cost is high, generally 2,800-3,500 yuan per root.

[0004] Publication (Announcement) No.: CN204457726U, discloses a slotted anti-fouling gas anchor for oil well repair. The slotted slot is cut along the tangent direction of the outer wall of the steel pipe, so that the liquid enters the gas anchor and rotates along the inner wall of the steel pipe to enter downward, and only dirt smaller than 1.5 mm can enter the annular inner cavity. It has the function of intercepting fine particles like a slotted screen pipe; it has the function of degassing an ordinary gas anchor; and it has the function of capturing stolen goods like a dirt collector.

[0005] The prior art is that the suction port of the traditional slotted air anchor is easily blocked and has a high operating cost.

[0006] Publication (Announcement) No.: CN110080742A discloses a rotating spiral air anchor, which realizes two separation methods for gas and liquid. One is the centrifugal separation of gas and liquid rotating along the spiral path, and the other is the forced centrifugal separation driven by the rotation of the spiral blade.

[0007] Publication (Announcement) No.: CN215520847U discloses a spiral composite air anchor, which makes maximum use of the wellbore cross-sectional space, making the design space of the air anchor larger, and is designed with a spiral body and a diverter sleeve, so that it can give full play to the spiral centrifugal separation and gravity sedimentation separation, making the separation efficiency higher and the effect better.

[0008] The above two existing technologies achieve sufficient separation of gas by setting up complex liquid flow channels. In order to ensure the design effect during use, a large design redundancy is required to cope with changes in downhole conditions. When the requirements cannot be met, the entire technology can only be replaced.

[0009] In short, the technical solutions of the above-disclosed technologies, the technical problems to be solved and the beneficial effects produced are all different from the present utility model. Regarding more technical features, technical problems to be solved and the beneficial effects of the present utility model, there is no technical inspiration in the above-disclosed technical documents. Utility Model Content

[0010] In view of the above-mentioned defects in the prior art, the purpose of the utility model is to provide a gas anchor with more complete gas-liquid separation.

[0011] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0012] A gas anchor with more complete gas-liquid separation comprises a variable buckle joint, the center of the variable buckle joint is connected, a single joint is arranged at the upper end of the variable buckle joint, and an outer ring joint and an inner ring joint are arranged at the lower end of the variable buckle joint; the outer ring joint is threadedly connected to a first oil pipe, and the inner ring joint is threadedly connected to a center pipe, and at least two sieve holes are arranged on the first oil pipe; at least one continuous oil pipe unit is arranged at the lower end of the first oil pipe; at least one extended center pipe is arranged at the lower end of the center pipe; the lower end of the lowest extended center pipe is connected to a vortex tube via a third threaded joint.

[0013] Furthermore, the coiled tubing unit comprises a second tubing, an upper outer wall of the second tubing is provided with a tubing coupling, and an upper inner wall of the tubing coupling located at the top is threadedly connected to a lower outer wall of the first tubing.

[0014] Furthermore, when at least two coiled tubing units are provided, the lower end outer walls of adjacent second tubings are threadedly connected to the upper end inner walls of the tubing couplings.

[0015] Furthermore, the lower end of the central tube is connected to the uppermost extended central tube via a first threaded joint, and when at least two central tubes are provided, adjacent central tubes are connected via a second threaded joint.

[0016] Furthermore, the outer wall of the cyclone tube is provided with a spiral steel sheet.

[0017] Furthermore, the first oil pipe and the second oil pipe have the same caliber specifications;

[0018] Specifically, the central tube and the extended central tube have the same caliber specifications;

[0019] Specifically, the first threaded joint, the second threaded joint, and the third threaded joint have the same specifications.

[0020] Furthermore, the central tube and the extended central tube have an inner diameter of 36 mm and an outer diameter of 48 mm;

[0021] Specifically, the first oil pipe and the second oil pipe have an inner diameter of 61 mm and an outer diameter of 73 mm;

[0022] Specifically, the inner diameter of the cyclone tube is 36 mm, the outer diameter is 48 mm, and the outer diameter of the spiral steel sheet is 56 mm.

[0023] Further, the axial half-section of the variable buckle joint is in an "h" shape;

[0024] Specifically, the upper end protrusion in the "h" shape is a single joint;

[0025] Specifically, the lower left leg of the “h” shape is the outer ring joint;

[0026] Specifically, the lower right leg of the “h” shape is the inner ring joint;

[0027] Specifically, the horizontal portion in the "h" shape is provided with a limiting portion that protrudes from the right leg;

[0028] Specifically, the upper outer wall of the first oil pipe is connected to the inner wall of the left leg and is limited by the horizontal part, and the upper outer wall of the central pipe is connected to the inner wall of the right leg and is limited by the limiting part.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] The utility model realizes sufficient gas-liquid separation and reduces gas loss by arranging a continuous oil pipe unit and lengthening the central pipe, and uses parts that can be repeatedly produced, with low cost. It is suitable for coalbed methane wells with large gas volume, high pump hanging, horizontal wells and other well inclinations. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an air anchor with more complete gas-liquid separation according to the utility model.

[0032] In the figure: 1, variable buckle joint; 2, center pipe; 3, sieve hole; 4, first oil pipe; 5, oil pipe coupling; 6, extended center pipe; 7, second oil pipe; 8, swirl pipe. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Embodiment 1:

[0035] See also Figure 1The utility model provides an air anchor with more complete gas-liquid separation, including a variable buckle joint 1, the center of the variable buckle joint 1 is through, a single joint is arranged at the upper end of the variable buckle joint 1, an outer ring joint and an inner ring joint are arranged at the lower end of the variable buckle joint 1, the outer ring joint is threadedly connected to a first oil pipe 4, the inner ring joint is threadedly connected to a center pipe 2, and at least two sieve holes 3 are arranged on the first oil pipe 4.

[0036] At least one continuous tubing unit is arranged at the lower end of the first oil pipe 4, and the continuous tubing unit includes a second oil pipe 7. A pipe coupling 5 is arranged on the outer wall of the upper end of the second oil pipe 7, and the upper inner wall of the uppermost pipe coupling 5 is threadedly connected to the outer wall of the lower end of the first oil pipe 4. When at least two continuous tubing units are arranged, the outer walls of the lower ends of adjacent second oil pipes 7 are threadedly connected to the inner walls of the upper ends of the pipe couplings 5.

[0037] At least one extended central tube 6 is arranged at the lower end of the central tube 2, and the lower end of the central tube 2 is connected to the uppermost extended central tube 6 via a first threaded joint. When at least two central tubes 2 are arranged, adjacent central tubes 2 are connected via a second threaded joint.

[0038] The lower end of the lowest extended central tube 6 is connected to the vortex tube 8 through a third threaded joint, and the outer wall of the vortex tube 8 is provided with a spiral steel sheet.

[0039] The sieve holes 3 allow the liquid to flow in and discharge the gas between the first oil pipe 4 and the central pipe 2 .

[0040] The coiled tubing unit and the lengthened central tube 6 lengthen the liquid flow channel, so that the gas has a longer separation distance and the separation is more complete.

[0041] The spiral steel sheets on the outer wall of the cyclone tube 8 further separate the residual trace gas in the liquid flow.

[0042] Among them, the first oil pipe 4 and the second oil pipe 7 have the same caliber specifications. The first oil pipe 4 and the second oil pipe 7 and the two second oil pipes 7 are connected through an external oil pipe coupling 5, which can make the connection between the first oil pipe 4 and the second oil pipe 7 and the connection between the two second oil pipes 7 smooth, so that there is no area in the liquid flow channel where gas can be retained.

[0043] Among them, the central tube 2 and the extended central tube 6 have the same caliber specifications, and the first threaded joint, the second threaded joint, and the third threaded joint have the same specifications, so that the inner and outer walls of the central tube 2 and the extended central tube 6 have a smooth transition, so that there is no area in the liquid flow channel where gas can be retained.

[0044] Embodiment 2:

[0045] Based on Example 1, this example provides a specific gas anchor with more complete gas-liquid separation.

[0046] Specifically, the central tube 2 and the extended central tube 6 have an inner diameter of 36 mm and an outer diameter of 48 mm.

[0047] Specifically, the first oil pipe 4 and the second oil pipe 7 have an inner diameter of 61 mm and an outer diameter of 73 mm.

[0048] Specifically, the cyclone tube 8 has an inner diameter of 36 mm and an outer diameter of 48 mm, and the outer diameter of the spiral steel sheet is 56 mm.

[0049] Specifically, the axial semi-section of the variable buckle joint 1 is in an "h" shape, the upper protruding part of the "h" shape is a single joint, the lower left leg of the "h" shape is an outer ring joint, the lower right leg of the "h" shape is an inner ring joint, and the horizontal part of the "h" shape is provided with a limiting part protruding the right leg, the upper outer wall of the first oil pipe 4 is threadedly connected with the inner wall of the left leg and limited by the horizontal part, and the upper outer wall of the center pipe 2 is threadedly connected with the inner wall of the right leg and limited by the limiting part.

[0050] A method of using a gas anchor with more complete gas-liquid separation:

[0051] According to the gas content of the liquid, set a reasonable number of coiled tubing units and lengthen the central tube 6;

[0052] Use it in the same way as conventional air anchors;

[0053] When the gas separation is insufficient, the pipe string is pulled out, and the number of coiled tubing units and the lengthened center pipe 6 are increased.

[0054] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0055] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0056] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0057] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A gas anchor with more complete gas-liquid separation, comprising a variable buckle joint, wherein the variable buckle joint is centrally connected, characterized in that: A single joint is arranged at the upper end of the variable buckle joint, and an outer ring joint and an inner ring joint are arranged at the lower end of the variable buckle joint; The outer ring joint is threadedly connected to a first oil pipe, and the inner ring joint is threadedly connected to a center pipe, and the first oil pipe is provided with at least two sieve holes; At least one coiled tubing unit is disposed at the lower end of the first tubing; At least one extended central tube is arranged at the lower end of the central tube; The lower end of the lowest extended central tube is connected to the swirl tube through a third threaded joint.

2. A gas anchor with more complete gas-liquid separation according to claim 1, characterized in that: The coiled tubing unit comprises a second tubing, an upper outer wall of the second tubing is provided with a tubing coupling, and an upper inner wall of the tubing coupling located at the top is threadedly connected to a lower outer wall of the first tubing.

3. A gas anchor with more complete gas-liquid separation according to claim 2, characterized in that: When at least two coiled tubing units are provided, the lower end outer walls of adjacent second tubings are threadedly connected to the upper end inner walls of tubing couplings.

4. The gas anchor with more complete gas-liquid separation according to claim 2, characterized in that: The lower end of the central tube is connected to the uppermost extended central tube via a first threaded joint. When at least two central tubes are provided, adjacent central tubes are connected via a second threaded joint.

5. A gas anchor with more complete gas-liquid separation according to claim 4, characterized in that: The outer wall of the cyclone tube is provided with a spiral steel sheet.

6. The gas anchor with more complete gas-liquid separation according to claim 5, characterized in that: The first oil pipe and the second oil pipe have the same caliber specifications; The central tube and the extended central tube have the same caliber specifications; The first threaded joint, the second threaded joint and the third threaded joint have the same specifications.

7. A gas anchor with more complete gas-liquid separation according to claim 6, characterized in that: The inner diameter of the central tube and the extended central tube is 36 mm and the outer diameter is 48 mm; The inner diameter of the first oil pipe and the second oil pipe is 61 mm, and the outer diameter is 73 mm; The inner diameter of the cyclone tube is 36 mm, the outer diameter is 48 mm, and the outer diameter of the spiral steel sheet is 56 mm.

8. A gas anchor with more complete gas-liquid separation according to any one of claims 1 to 7, characterized in that: The axial half-section of the variable buckle joint is in an "h" shape; The upper protrusion in the "h" shape is a single joint; The lower left leg of the "h" shape is the outer ring joint; The lower right leg of the "h" shape is the inner ring joint; The horizontal portion of the "h" shape is provided with a limiting portion protruding from the right leg; The upper outer wall of the first oil pipe is connected to the inner wall of the left leg and is limited by the horizontal part. The upper outer wall of the central pipe is connected to the inner wall of the right leg and is limited by the limiting part.

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