Wellbore cleaning tool for oil and gas production well

Abstract

The utility model discloses a shaft cleaning tool for a production oil-gas well, which comprises a short section body with a hollow rotary body structure, two ends of the short section body are opened and are provided with screw joints, the side wall of the short section body is provided with nozzle mounting holes, the nozzle mounting holes are uniformly distributed along the circumferential direction of the short section body, and the nozzle mounting holes are communicated with the short section body. A cleaning nozzle which is rotatably mounted is arranged in the nozzle mounting hole and is provided with at least three spiral water holes. The rotatable cleaning nozzles are ingeniously arranged, the arrangement scheme is optimized, omission areas in the washing and cleaning process can be effectively avoided or reduced, and therefore the good cleaning effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole tools for oil and gas production, in particular to a wellbore cleaning tool for oil and gas production. Background Art

[0002] In the later stages of oil well production, wax and scale often form on the wellbore walls due to factors such as decreased formation pressure, changes in fluid properties, and aging wellbore structures. These phenomena seriously impact the overall production performance and oil and gas recovery rate of the well. Wax and scale adsorption or deposition on the wellbore directly impacts equipment efficiency, increases production costs, and can even cause equipment damage or wellbore blockage.

[0003] To address these issues, regular wax and scale removal is an important way to improve oil well production efficiency and extend well life. Common wax and scale removal methods include hot jet flushing or chemical agents. Traditional nozzle jets are linear, with a relatively small coverage area. Furthermore, areas are easily missed during operation, directly impacting cleaning efficiency and quality. Chemical soaking often requires additional cleaning of the pipe wall, which also presents the same issues as traditional cleaning tools. Utility Model Content

[0004] In view of this, the utility model provides a wellbore cleaning tool for oil and gas production, aiming to solve the technical problems that the current wax scale cleaning tools are poor in effect and easily leave areas that are missed during cleaning.

[0005] To achieve the above purpose, the technical solution of this utility model is as follows:

[0006] A tool for cleaning the wellbore of an oil and gas well comprises a short section body in the form of a hollow rotating body, with both ends of the short section body open and having screw joints. The key feature of the tool is that the side wall of the short section body has nozzle mounting holes, the nozzle mounting holes are evenly distributed along the circumference of the short section body, and a cleaning nozzle is rotatably mounted in the nozzle mounting hole, and the cleaning nozzle has at least three spiral water holes.

[0007] With the above solution, the cleaning nozzle on the short section body is in a rotating state during operation, and its ejected flow contacts the wellbore in a planar manner. Compared with the point-to-straight line flow of the traditional fixed nozzle, it can clean the inner wall to the maximum extent, avoid or reduce the missed areas, and thus improve the cleaning effect.

[0008] As a preferred embodiment, the spiral water holes are evenly distributed along the axis of the cleaning nozzle. The above solution is beneficial to ensure the rotation stability of the cleaning nozzle and reduce the deflection.

[0009] Preferably, the flow area of ​​the spiral water hole gradually decreases from the inside to the outside along the radial direction of the short section body. With the above solution, the flow area gradually decreases, which can achieve the effect of self-pressurization, thereby increasing the ejection speed of the jet flow and having a greater impact force.

[0010] Preferably, the nozzle mounting holes are evenly distributed in a spiral along the length of the sub. This arrangement ensures only one nozzle mounting hole per axial segment, fully ensuring the overall strength of the sub and extending its service life. Furthermore, the spirally distributed cleaning nozzles, combined with the self-rotation of the cleaning nozzles and the rotation of the sub, provide a fully covered, repetitive jet surface cleaning of the inner cylinder wall, resulting in a more effective cleaning effect.

[0011] Preferably, the nozzle mounting hole is a stepped hole perpendicular to the axis of the sub, with an outer diameter greater than the inner diameter. The cleaning nozzle body is cylindrical and mounted within the nozzle mounting hole via a bearing. The bearing and the nozzle mounting hole, as well as the cleaning nozzle and the bearing, have an interference fit or a threaded fit. This arrangement facilitates processing and assembly, reduces implementation difficulty, and facilitates implementation.

[0012] Preferably, both ends of the short section body are male buckle joints.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The oil and gas wellbore cleaning tool provided by the utility model can effectively avoid or reduce missed areas during the flushing and cleaning process by cleverly setting the rotatable cleaning nozzles and optimizing the layout scheme, thereby ensuring a good cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model;

[0016] Figure 2 A cross-sectional view of an installation structure for a cleaning nozzle;

[0017] Figure 3 This is a schematic diagram of the short section body structure;

[0018] Figure 4 A perspective view of the cleaning nozzle.

[0019] In the figure: 100, short section body; 110, nozzle mounting hole;

[0020] 200. Cleaning nozzle; 210. Spiral water eye; 300. Bearing. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0022] refer to Figures 1 to 4 The oil and gas wellbore cleaning tool shown mainly includes a short section body 100 of a hollow rotary tubular structure. Both ends of the short section body 100 are open and have threaded joints, which can be quickly connected to the oil pipe for entering the well.

[0023] The side wall of the short section body 100 has a nozzle mounting hole 110 connected to the hollow inner cavity thereof. The nozzle mounting holes 110 are evenly distributed along the circumference of the short section body 100, and a cleaning nozzle 200 is rotatably installed in the nozzle mounting hole 110. The cleaning nozzle 200 has at least three spiral water holes 210. In this embodiment, the spiral water holes 210 are evenly distributed along the axis of the cleaning nozzle 200.

[0024] In this embodiment, the axis of the nozzle mounting hole 110 is perpendicular to the axis of the short section body 100. Specifically, the structure of the cleaning nozzle 200 is generally as follows: Figure 4 As shown, the appearance is similar to that of a conventional nozzle structure, which is a columnar structure. The difference is that there are at least three spiral water holes 210 inside. The spiral water holes 210 are spiral, and the number of spiral turns is less than 1. The cleaning nozzle 200 is installed in the nozzle mounting hole 110 through a bearing 300. In this way, when water flows through the spiral water holes 210, it can drive the cleaning nozzle 200 to rotate as a whole. When it acts on the inner wall of the wellbore, it actually forms a surface impact, which has a larger coverage area than traditional point impact and can achieve a better impact effect.

[0025] In specific implementation, threaded fastening or interference fit can be used between the bearing 300 and the nozzle mounting hole 110, as well as between the cleaning nozzle 200 and the bearing 600. The nozzle mounting hole 110 can be set in a stepped hole shape. With the help of special installation tools, the inner end diameter of the nozzle mounting hole 110 can be larger than the outer end diameter. In this way, the cleaning nozzle 200 is installed from the inside of the short section body 100, which can improve the installation stability of the cleaning nozzle 200, facilitate replacement, and withstand greater pressure. In this case, both ends of the short section body 100 are male buckle joints, which can avoid damage to the thread during disassembly and assembly.

[0026] Of course, you can also Figure 3 The structure shown is set up in reverse, and the outer diameter of the nozzle mounting hole 110 is larger than the inner diameter. At this time, it can be installed from the outside, which is relatively easier to install the cleaning nozzle 200, but not particularly conducive to its disassembly and replacement.

[0027] Based on the cleaning nozzle 200 structure of this type, the flow area of ​​the spiral water hole 210 thereof gradually decreases from the inside to the outside along the radial direction of the short section body 100, which can achieve a certain self-pressurization effect, that is, increase the impact force of the jet flow.

[0028] Of course, in addition to the above structure, the cleaning nozzle 200 can also adopt a fan blade-like structure, which is supported in the nozzle mounting hole 110 by an axis frame. The gap between adjacent blades constitutes a spiral water eye 210 structure. Similar structures are within the protection scope of this application.

[0029] In this application, in order to fully ensure the flushing coverage area and at the same time ensure the overall strength of the short section body 100, the nozzle mounting holes 110 are evenly distributed in a spiral along the length direction of the short section body 100, that is, all nozzle mounting holes 110 are arranged at equal intervals in the length direction and circumferential direction of the short section body 100.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention. Such changes fall within the scope of protection of the present invention.

Claims

1. A wellbore cleaning tool for oil and gas wells, comprising a short section body (100) in a hollow rotating body structure, with both ends of the short section body (100) open and having screw joints, characterized in that: The side wall of the short section body (100) is provided with nozzle mounting holes (110), the nozzle mounting holes (110) are evenly distributed along the circumference of the short section body (100), and a cleaning nozzle (200) is rotatably mounted in the nozzle mounting hole (110), and the cleaning nozzle (200) has at least three spiral water holes (210).

2. The oil and gas wellbore cleaning tool according to claim 1, characterized in that: The spiral water holes (210) are evenly distributed along the axis of the cleaning nozzle (200).

3. The oil and gas wellbore cleaning tool according to claim 1, characterized in that: The flow area of ​​the spiral water eye (210) gradually decreases from the inside to the outside along the radial direction of the short section body (100).

4. The oil and gas wellbore cleaning tool according to any one of claims 1 to 3, characterized in that: The nozzle mounting holes (110) are evenly distributed in a spiral shape along the length direction of the short section body (100).

5. The oil and gas wellbore cleaning tool according to claim 1, characterized in that: The nozzle mounting hole (110) is a stepped hole perpendicular to the axis of the short section body (100), and its outer end diameter is larger than the inner end diameter. The cleaning nozzle (200) body is columnar and is mounted in the nozzle mounting hole (110) through a bearing (300). An interference fit or a threaded fit is formed between the bearing (300) and the nozzle mounting hole (110), and between the cleaning nozzle (200) and the bearing (300).

6. The oil and gas wellbore cleaning tool according to any one of claims 1 to 3, characterized in that: Both ends of the short section body (100) are male buckle joints.

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