Micropore foaming device for gas well shaft

Abstract

The utility model discloses a micropore bubbling device for a gas well shaft. The micropore bubbling device comprises a gas collecting hood, a gas distributor and a bubbler which are sequentially connected from bottom to top. A plurality of exhaust pipes communicated with the interior of the gas collecting hood are arranged on the upper surface of the gas distributor; a plurality of bubbling holes are formed in the surface of the bubbler; the outer diameter of the gas collecting hood and the outer diameter of the gas distributor are both smaller than the outer diameter of the bubbler. The utility model provides a micropore foaming device for a gas well shaft, which aims to solve the problem that a foam drainage process in the prior art is limited in liquid drainage effect on a low-pressure low-yield gas well, and achieves the purposes of improving the liquid carrying efficiency of accumulated liquid in the shaft and improving the yield of the gas well.

Description

Technical Field

[0001] The utility model relates to the field of petroleum and natural gas exploitation, in particular to a microporous bubbling device used in a gas wellbore. Background Art

[0002] Gas wells often face the problem of wellbore liquid accumulation during production, resulting in reduced gas well production or even shutdown. Traditional drainage and production-increasing technologies such as foam drainage and mechanical drainage have certain limitations and operational complexity. For example, the traditional foam drainage process is to inject foaming agents into the gas well to form foam in the bottom-well liquid, which is beneficial to the lifting of the gas on the liquid, achieving the purpose of drainage and gas production; however, for low-pressure and low-yield gas wells, the traditional foam drainage process has limited effect. For this reason, it is particularly important to develop an efficient, stable and easy-to-operate foam drainage device. Utility Model Content

[0003] The utility model provides a microporous bubbling device for a gas wellbore, so as to solve the problem that the bubbling drainage process in the prior art has limited drainage effect on low-pressure and low-yield gas wells, and achieve the purpose of improving the liquid carrying efficiency of wellbore liquid accumulation and increasing the gas well production.

[0004] The utility model is realized by the following technical solutions:

[0005] A microporous bubbling device for a gas well bore, comprising a gas collecting hood, a gas distributor and a bubbler connected in sequence from bottom to top;

[0006] The upper surface of the gas distributor is provided with a plurality of exhaust pipes connected with the interior of the gas collecting hood;

[0007] A plurality of bubble holes are provided on the surface of the bubbler;

[0008] The outer diameters of the gas collecting hood and the gas distributor are both smaller than the outer diameter of the bubbler.

[0009] In view of the problem that the bubble drainage process in the prior art has limited drainage effect on low-pressure and low-yield gas wells, the utility model proposes a microporous bubbler device for a gas wellbore. The device comprises three structures from bottom to top: a gas collecting hood, a gas distributor, and a bubbler. The gas collecting hood is located at the bottom of the device, and as the name suggests, it is used to collect the gas entering the wellbore and introduce the collected gas into the gas distributor. The gas distributor distributes the gas through a number of exhaust pipes thereon, so that the gas is dispersed and moves upward relatively evenly to the bottom of the bubbler, and then generates fine bubbles through the bubble holes on the surface of the bubbler.

[0010] When the present application is used, the device is located at the upper position of the bottom of the well near the production layer, and a foaming agent is injected to the bottom of the well through the casing to mix the foaming agent with the bottom of the well liquid. The mixed liquid rises along the well wall in the form of a liquid film, and the generated gas enters the gas collection hood. The ascending liquid film reaches the lower surface of the bubbler, and then a large number of bubbles are generated through the bubbler, which brings the bottom of the well liquid out of the wellbore in the form of bubbles, thereby improving the carrying efficiency of the liquid and achieving efficient liquid carrying.

[0011] In addition, the outer diameters of the gas collecting hood and the gas distributor are smaller than the outer diameter of the bubbler, so that the liquid film can smoothly move upward along the well wall and avoid interfering with the movement of the liquid film.

[0012] It should be noted that the device can be put into the well by any existing method, such as directly connected or pre-installed on the production string, or suspended into the well during the production process, etc.; its specific way of entering the well and the way of connecting with the production string in the well are not specifically limited here. In addition, the upper and lower in this application are based on the direction of the device towards the wellhead after entering the well as the direction towards the bottom of the well as the upper direction.

[0013] Furthermore, a bell mouth is provided at the bottom end of the gas collecting hood, and the gas distributor has an air flow channel connected to the inside of the gas collecting hood, and all exhaust pipes are connected to the air flow channel. The bell mouth structure facilitates guiding the bottom gas into the gas collecting hood. The gas entering the gas collecting hood is dispersed to each exhaust pipe for discharge through the air flow channel.

[0014] Furthermore, the top ends of all exhaust pipes are located above the upper surface of the gas distributor; that is, the top ends of all exhaust pipes are higher than the surface height of the gas distributor. This arrangement can effectively prevent sand and significantly reduce the risk of formation sand returning to block the exhaust pipe.

[0015] Furthermore, the upper surface of the gas distributor is in a cone shape that is small at the top and large at the bottom, which prevents formation sand from accumulating on the gas distributor to bring unnecessary load to the present application, and further prevents formation sand from clogging the exhaust pipe.

[0016] Furthermore, the bubbler is in an arc-shaped structure with a concave surface facing downward; this structure facilitates the liquid film formed by the accumulated liquid at the bottom of the well to enter the interior of the bubbler, thereby improving the bubble effect; at the same time, it can prevent the accumulation of sand returned from the bottom of the well that moves above the bubbler on the bubbler and prevent the returned sand from clogging the bubble holes.

[0017] Furthermore, the diameter of the bubbling holes is 5 to 10 mm to ensure that sufficiently fine bubbles are generated.

[0018] Furthermore, the gas distributor and the bubbler are connected via a hollow structure; in this solution, the gas distributor and the bubbler are not sealed to ensure that the liquid film can stably enter the interior of the bubbler.

[0019] Furthermore, the hollow structure is a plurality of support rods evenly distributed in an annular shape; in this solution, the gas distributor and the bubbler are connected by a plurality of support rods, and the adjacent support rods are completely open structures, which can ensure sufficient hollowing and thus ensure the effective upward movement of the liquid film.

[0020] Furthermore, a sand settling groove is arranged on the edge of the bubbler.

[0021] The sand returned from the bottom of the well that moves through the bubbler holes to the top of the bubbler may not be lifted to the wellhead and may fall back. At this time, the sand return tank can be used to collect the sand to avoid clogging the bubbler holes.

[0022] Furthermore, the outer diameter of the bubbler is equal to the inner diameter of the gas wellbore, that is, on a cross section perpendicular to the axial direction of the wellbore, the projection of the bubbler completely fills the inside of the wellbore, thereby ensuring that the liquid film fully enters the bubbler, improving the bubble effect of the present application.

[0023] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0024] 1. The utility model is a microporous bubbling device for a gas wellbore, which can generate a large number of bubbles and bring the bottom well liquid out of the wellbore in the form of bubbles, which can significantly increase the gas-liquid contact area and improve the liquid carrying efficiency, thereby achieving efficient liquid carrying, which is beneficial to increasing the gas well production.

[0025] 2. The utility model provides a microporous bubbling device for a gas wellbore, which can effectively prevent sand and significantly reduce the risk of formation sand returning to block the device.

[0026] 3. The utility model is a microporous bubbling device for a gas wellbore, which can operate stably in the well and continuously generate bubbles, thereby preventing liquid accumulation and extending the production life of the gas well.

[0027] 4. The utility model is a microporous bubbling device for gas well boreholes, which has the advantages of simple structure, easy installation and maintenance, and can adapt to different well conditions and has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0029] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model;

[0030] Figure 2 It is a cross-sectional view of a specific embodiment of the utility model when in use;

[0031] Figure 3 for Figure 2A partial enlarged view of the middle A;

[0032] Figure 4 for Figure 2 A partial enlarged view of point B in the middle.

[0033] Marks and corresponding parts names in the attached drawings:

[0034] 1-gas collecting hood, 2-gas distributor, 3-bubbler, 4-exhaust pipe, 5-bubbling hole, 6-air flow channel, 7-support rod, 8-sand settling tank. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail in combination with the embodiments and the accompanying drawings. The schematic implementation mode of the utility model and its description are only used to explain the utility model and are not used as a limitation of the utility model. In the description of the present application, it should be understood that the orientation or position relationship indicated by terms such as "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application.

[0036] Embodiment 1:

[0037] like Figures 1 to 3 A microporous bubbling device for a gas wellbore shown includes a gas collecting hood 1, a gas distributor 2 and a bubbler 3 connected in sequence from bottom to top;

[0038] A plurality of exhaust pipes 4 communicating with the interior of the gas collecting hood 1 are arranged on the upper surface of the gas distributor 2;

[0039] The surface of the bubbler 3 is provided with a plurality of bubble holes 5;

[0040] The outer diameters of the gas collecting hood 1 and the gas distributor 2 are both smaller than the outer diameter of the bubbler 3 .

[0041] A bell mouth is arranged at the bottom end of the gas collecting hood 1 , and an air flow channel 6 connected to the inside of the gas collecting hood 1 is arranged inside the gas distributor 2 , and all exhaust pipes 4 are connected to the air flow channel 6 .

[0042] Top ends of all exhaust pipes 4 are located above the upper surface of the gas distributor 2 .

[0043] In this embodiment, the upper surface of the gas distributor 2 is in a cone shape that is smaller at the top and larger at the bottom; the bubbler 3 is in an arc-shaped structure with a concave surface facing downward.

[0044] In this embodiment, the diameter of the bubbling hole 5 is 5-10 mm. The inner diameter of the exhaust pipe 4 is greater than or equal to the diameter of the bubbling hole 5 .

[0045] In this embodiment, Figure 2 As shown, the outer diameter of the bubbler 3 is equal to the inner diameter of the gas wellbore.

[0046] When the microporous foaming device of this embodiment needs to be used, the process is as follows:

[0047] S1. Install the microporous bubbler at a suitable position in the gas wellbore - the upper position of the bottom of the well close to the production layer, ensuring that it is stable and does not affect normal production;

[0048] S2. Introduce the foaming agent into the wellbore through the casing. The foaming agent should be a chemical agent with good surface activity, thermal stability and chemical stability. During the introduction process, the injection amount of the foaming agent is controlled by the wellhead equipment to ensure that the generated bubbles are uniform and stable.

[0049] S3. Monitor the gas well production in real time, adjust the injection amount of the foaming agent, and optimize the liquid carrying effect.

[0050] Embodiment 2:

[0051] A microporous bubbling device for a gas well bore, based on Example 1, as Figures 1 to 3 As shown, the gas distributor 2 and the bubbler 3 are connected via a hollow structure.

[0052] The hollow structure in this embodiment is a plurality of support rods 7 evenly distributed in an annular shape.

[0053] Optionally, the hollow structure may also use a number of metal wires to suspend the gas distributor 2 below the bubbler 3 .

[0054] In a more preferred embodiment, a ring-shaped sand settling groove 8 is provided on the edge of the bubbler 3 .

[0055] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

[0056] It should be noted that, in this article, terms such as "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, the term "connected" used in this article can be directly connected or indirectly connected via other components without special explanation.

Claims

1. A microporous bubbling device for a gas well, characterized in that: It comprises a gas collecting hood (1), a gas distributor (2) and a bubbler (3) which are connected in sequence from bottom to top; A plurality of exhaust pipes (4) connected to the interior of the gas collecting hood (1) are arranged on the upper surface of the gas distributor (2); A plurality of bubble holes (5) are provided on the surface of the bubbler (3); The outer diameters of the gas collecting hood (1) and the gas distributor (2) are both smaller than the outer diameter of the bubbler (3).

2. A microporous bubbling device for a gas well bore according to claim 1, characterized in that: A bell mouth is provided at the bottom end of the gas collecting hood (1), the gas distributor (2) has an air flow channel (6) in communication with the interior of the gas collecting hood (1), and all exhaust pipes (4) are in communication with the air flow channel (6).

3. A microporous bubbling device for a gas well bore according to claim 1, characterized in that: The top ends of all exhaust pipes (4) are located above the upper surface of the gas distributor (2).

4. A microporous bubbling device for a gas well bore according to claim 1, characterized in that: The upper surface of the gas distributor (2) is in a cone shape that is smaller at the top and larger at the bottom.

5. A microporous bubbling device for a gas well bore according to claim 1, characterized in that: The bubbler (3) is in an arc-shaped structure with the concave surface facing downward.

6. A microporous bubbling device for a gas well bore according to claim 1, characterized in that: The pore diameter of the foaming hole (5) is 5 to 10 mm.

7. A microporous bubbling device for a gas well bore according to claim 1, characterized in that: The gas distributor (2) and the bubbler (3) are connected via a hollow structure.

8. A microporous bubbling device for a gas well bore according to claim 7, characterized in that: The hollow structure is a plurality of support rods (7) evenly distributed in an annular shape.

9. A microporous bubbling device for a gas well bore according to claim 1, characterized in that: A sand settling groove (8) is provided at the edge of the bubbler (3).

10. A microporous bubbling device for a gas well bore according to claim 1, characterized in that: The outer diameter of the bubbler (3) is equal to the inner diameter of the gas wellbore.

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