Pigging device for oil and gas pipelines

Abstract

The application discloses a pigging device for oil and gas conveying pipeline, which comprises a first front leather bowl, a first rear leather bowl, a second front leather bowl and a second rear leather bowl which are arranged along the axial direction of the pipeline in sequence and at intervals, the first front leather bowl is connected with the first rear leather bowl through a cylinder, the first rear leather bowl is connected with the second front leather bowl through a flexible connecting piece, a brush body is arranged between the second front leather bowl and the second rear leather bowl, and the circumferential outer surface of the brush body is in interference fit with the inner wall of the pipeline, the brush body is arranged at the front end of a rotating shaft arranged along the axial direction of the pipeline, and an impeller is arranged at the rear end of the rotating shaft. The application can improve the cleaning efficiency without affecting the overall operation speed of the device, and can filter and collect the dust and debris removed, so that the dirty is prevented from mixing into the medium and affecting the quality of the pipeline transportation medium.

Description

Technical Field

[0001] This invention relates to a pipeline cleaning device for oil and gas transmission pipelines, belonging to the field of pipeline equipment technology. Background Technology

[0002] Pipeline transportation is a crucial mode of transporting oil and natural gas. During long-term pipeline operations, blockages can occur due to external factors such as earthquakes, construction, and weather conditions like rain and snow. In severe cases, these blockages can lead to oil and gas leaks, causing economic losses and environmental pollution. Therefore, regular cleaning and dredging of oil and gas pipelines are essential. Pipeline cleaning devices are widely used in the oil and gas pipeline industry, including pipeline pigs and internal inspection devices. Most of these rely on the medium being transported within the pipeline for propulsion and are pressure differential-driven devices. The purpose of pipeline cleaning is to remove debris, accumulated liquid, and contaminants from long-distance natural gas pipelines, improving pipeline transport efficiency, reducing friction losses, minimizing internal corrosion, and extending pipeline lifespan. However, existing pipeline cleaning equipment is inefficient, provides unsatisfactory cleaning results, and the removed contaminants can easily contaminate the medium inside the pipeline. Summary of the Invention

[0003] The purpose of this invention is to provide a pipeline cleaning device for oil and gas transportation pipelines. This pipeline cleaning device improves cleaning efficiency without affecting the overall operating speed of the equipment, and can also filter and collect the removed dust and debris to prevent dirt from mixing into the medium and affecting the quality of the medium transported in the pipeline.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a pipeline cleaning device for oil and gas transportation pipelines, comprising: a first front cup, a first rear cup, a second front cup, and a second rear cup arranged sequentially at intervals along the axial direction of the pipeline; the first front cup and the first rear cup are connected by a cylindrical body; the first rear cup and the second front cup are connected by a flexible connector; a brush body is installed between the second front cup and the second rear cup, and the outer circumferential surface of the brush body is press-fitted with the inner wall of the pipeline; the brush body is installed at the front end of a rotating shaft arranged along the axial direction of the pipeline; and an impeller is installed at the rear end of the rotating shaft.

[0005] Each of the first front and second rear diaphragms has a first vent hole, and each of the first rear and second front diaphragms has a second vent hole in its center. The two ends of the flexible connector with internal flow channels are connected to the second vent holes on the first rear and second front diaphragms, respectively, so that the medium in the pipe can pass through the first vent hole on the second rear diaphragm, the flexible connector connecting the two second vent holes, and the first vent hole on the first front diaphragm in sequence. A filter screen is provided at the front end of the second front diaphragm and inside the cylinder. At least two dust collection holes are provided on the first rear and second front diaphragms outside their respective second vent holes. The second vent holes and dust collection holes on the first rear diaphragm are connected to the openings of the filter screen.

[0006] The following are further improvements to the above technical solution:

[0007] 1. In the above scheme, the inner diameter of the second venting orifice and the dust collection orifice is smaller than the inner diameter of the first venting orifice.

[0008] 2. In the above solution, the opening of the filter screen has an outer part that extends radially outward, and the outer part is connected to the front end face of the second front cup through a second front cup pressure plate.

[0009] 3. In the above scheme, the filter screen is a metal filter screen.

[0010] 4. In the above scheme, the brush body is mounted on the rotating shaft through a deceleration mechanism with a medium flow channel.

[0011] 5. In the above scheme, the deceleration mechanism further includes: a central gear mounted on a rotating shaft and several deceleration gears that are equally spaced around the outside of the central gear and mesh with the central gear, a cylindrical gear with teeth on its inner wall is mounted on the outside of the deceleration gears and meshes with each deceleration gear, and the brush body is mounted on the outer wall of the cylindrical gear.

[0012] 6. In the above scheme, each of the three reduction gears is rotatably installed between two face-to-face spaced cover plates. One cover plate is connected to the second front cup via a connecting fence, and the other cover plate is connected to the second rear cup via several connecting rods.

[0013] 7. In the above scheme, a dust collection pipe is provided between any two adjacent reduction gears, and the two ends of the dust collection pipe are connected to the through holes opened on the two cover plates respectively, thereby forming a medium flow channel.

[0014] 8. In the above scheme, the dust collection holes on the second front leather cup are set one-to-one with the dust collection pipes.

[0015] 9. In the above scheme, the end of the impeller opposite to the rotating shaft is rotatably connected to the second rear cup.

[0016] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0017] This invention relates to a pipeline cleaning device for oil and gas transportation pipelines. While achieving stable movement within the pipeline, the outer circumferential surface of a brush body installed between a second front and a second rear cup is interference-fitted with the inner wall of the pipeline. The brush body is mounted at the front end of a rotating shaft arranged axially along the pipeline, and an impeller is mounted at the rear end of the shaft. Each of the first front and second rear cups has a first vent hole, and each of the first rear and second front cups has a second vent hole in its center. The two ends of a flexible connector with internal flow channels are respectively connected to the second vent holes on the first rear and second front cups, allowing the medium in the pipeline to sequentially pass through the first vent hole on the second rear cup, the flexible connector connecting the two second vent holes, and the second vent hole on the first front cup. A filter screen is installed at the front end of the first venting orifice and inside the cylinder. At least two dust collection holes are opened on the first rear cup and the second front cup outside their respective second venting orifices. The second venting orifice and the dust collection hole on the first rear cup are connected to the opening of the filter screen. Without affecting the overall operating speed of the device, the impeller between the second front cup and the second rear cup is continuously driven to rotate by the medium with a high flow velocity in the pipeline, thereby driving the brush to rotate and clean the inner wall of the pipeline. This reduces the use of driving energy and maintains the continuity and stability of the driving force of the brush rotation, while improving the cleaning efficiency. It can also filter and collect the removed dust and debris to prevent dirt from mixing into the medium and affecting the quality of the medium transported in the pipeline. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of the pipeline cleaning device for oil and gas transportation pipelines according to the present invention;

[0019] Appendix Figure 2 This is a structural cross-sectional view of the pipeline cleaning device for oil and gas transportation pipelines according to the present invention;

[0020] Appendix Figure 3 This is a partial exploded view of the pipeline cleaning device for oil and gas transportation pipelines according to the present invention;

[0021] Appendix Figure 4 This is a partial structural cross-sectional view of the pipeline cleaning device for oil and gas transportation pipelines according to the present invention, taken from one direction.

[0022] Appendix Figure 5 This is a partial structural cross-sectional view of the pipeline cleaning device for oil and gas transportation pipelines according to the present invention from another direction.

[0023] In the attached figures above: 1. Brush body; 2. Rotating shaft; 3. Impeller; 4. Reduction mechanism; 41. Central gear; 42. Reduction gear; 43. Cylindrical gear; 431. Tooth; 44. Cover plate; 441. Flange; 45. Steel brush pressure ring; 51. First front cup; 52. First rear cup; 6. Flexible connector; 7. Dust collection through hole; 10. Second front cup; 11. Second rear cup; 121. First venting hole; 122. Second venting hole; 13. Connecting fence; 14. Connecting rod; 15. Dust collection pipe; 18. Filter screen; 181. External connection; 19. Second front cup pressure plate; 20. Cylinder. Detailed Implementation

[0024] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.

[0025] Example 1: A pipeline cleaning device for oil and gas transportation pipelines, comprising: a first front cup 51, a first rear cup 52, a second front cup 10, and a second rear cup 11 arranged sequentially at intervals along the axial direction of the pipeline. The cups, which are sealed to the inner wall of the pipeline, generate a pressure difference, driving the entire cleaning device to move forward in the pipeline at a speed V1. The forward flow speed V2 of oil and gas in the pipeline is much greater than V1. The first front cup 51 and the first rear cup 52 are connected by a cylinder 20, and the first rear cup 52 and the second front cup 10 are connected by a flexible connector 6. A brush body 1 is installed between the second front cup 10 and the second rear cup 11, and the outer circumferential surface of the brush body 1 is press-fitted with the inner wall of the pipeline. The brush body 1 is installed at the front end of a rotating shaft 2 arranged along the axial direction of the pipeline, and an impeller 3 is installed on the rear end of the rotating shaft 2.

[0026] Each of the first front diaphragm cup 51 and the second rear diaphragm cup 11 has a first vent hole 121, and each of the first rear diaphragm cup 52 and the second front diaphragm cup 10 has a second vent hole 122 in its center. The two ends of the flexible connector 6, which has a flow channel inside, are respectively connected to the second vent holes 122 on the first rear diaphragm cup 52 and the second front diaphragm cup 10, so that the medium in the pipeline can pass through the first vent hole 121 on the second rear diaphragm cup 11, the flexible connector 6 connecting the two second vent holes 122, and the first vent hole 121 on the first front diaphragm cup 51 in sequence. The oil and gas in the pipeline, which maintain a stable flow rate, enter and exit the first and second cavities formed by the second rear diaphragm cup, the brush body, and the second front diaphragm cup through the vent holes (channels). During this process, the impeller located in the first cavity is continuously driven to rotate. The rotating impeller drives the brush body to rotate through the shaft, and is press-fitted with the inner wall of the pipeline. The brush body moves forward along the pipe axis at a speed V1 while rotating circumferentially, thereby achieving complete contact friction between the brush body and the inner wall of the pipe. This allows for thorough cleaning of the stains on the inner wall of the pipe, improving the efficiency of pipe cleaning and the coverage and overlap of the cleaning area on the inner wall of the pipe. A filter screen 18 is installed at the front end of the second front cup 10 and inside the cylinder 20. At least two dust collection holes 7 are opened on the first rear cup 52 and the second front cup 10, located outside their respective second drainage holes 122. The second drainage holes 122 and dust collection holes 7 on the first rear cup 52 are connected to the openings of the filter screen 18. Some of the debris particles that detach from the inner wall of the pipe enter the first cavity, while others enter the second cavity. Ultimately, they all enter the front cavity through the drainage holes or dust collection holes along with the faster-flowing medium and are intercepted by the filter screen, preventing contamination of the medium.

[0027] The inner diameter of the second venting hole 122 and the dust collection hole 7 is smaller than the inner diameter of the first venting hole 121; the opening of the filter screen 18 has an outer part 181 that extends radially outward, and the outer part 181 is connected to the front end face of the second front cup 10 through a second front cup pressure plate 19; the filter screen 18 is a metal filter screen.

[0028] Example 2: A pipeline cleaning device for oil and gas transmission pipelines, comprising: a first front cup 51, a first rear cup 52, a second front cup 10, and a second rear cup 11 arranged sequentially at intervals along the axial direction of the pipeline; the first front cup 51 and the first rear cup 52 are connected by a cylindrical body 20; the first rear cup 52 and the second front cup 10 are connected by a flexible connector 6; a brush body 1 is installed between the second front cup 10 and the second rear cup 11, and the outer circumferential surface of the brush body 1 is press-fitted with the inner wall of the pipeline; the brush body 1 is installed at the front end of a rotating shaft 2 arranged along the axial direction of the pipeline; and an impeller 3 is installed at the rear end of the rotating shaft 2.

[0029] Each of the first front diaphragm 51 and the second rear diaphragm 11 has a first vent hole 121, and each of the first rear diaphragm 52 and the second front diaphragm 10 has a second vent hole 122 in its center. The two ends of the flexible connector 6, which has a flow channel inside, are respectively connected to the second vent holes 122 on the first rear diaphragm 52 and the second front diaphragm 10, so that the medium in the pipe can pass through the first vent hole 121 on the second rear diaphragm 11, the flexible connector 6 connecting the two second vent holes 122, and the first vent hole 121 on the first front diaphragm 51 in sequence. A filter screen 18 is provided at the front end of the second front diaphragm 10 and inside the cylinder 20. The first rear diaphragm 52 and the second front diaphragm 10 each have at least two dust collection holes 7 located outside their respective second venting holes 122. The second venting holes 122 and dust collection holes 7 on the first rear diaphragm 52 are connected to the opening of the filter screen 18. The first rear diaphragm and the second front diaphragm can also pre-clean the pipe wall by scraping against the inner wall of the pipe during the brushing process. The residue removed from the pipe wall can flow into the filter screen with the medium and be intercepted. In addition, through the combination of the channel in the flexible connector and multiple integrated holes, a stable flow rate can be maintained so that the device can move stably in the pipe, and a large-scale collection and interception of dirt can be achieved.

[0030] The brush body 1 is mounted on the rotating shaft 2 via a deceleration mechanism 4 with a medium flow channel. This reduces the brush body speed while increasing the torque, allowing the brush body to fully contact and rub against the inner wall of the pipe with a relatively constant and stable force, thereby further improving the cleaning effect and consistency.

[0031] The aforementioned deceleration mechanism 4 further includes: a central gear 41 mounted on the rotating shaft 2 and several deceleration gears 42 that are equally spaced along the circumference outside the central gear 41 and mesh with the central gear 41 respectively; a cylindrical gear 43 with teeth 431 on its inner wall is mounted on the outer side of the deceleration gear 42 and meshes with each deceleration gear 42; and the aforementioned brush body 1 is mounted on the outer wall of the cylindrical gear 43.

[0032] Each of the three reduction gears 42 is rotatably mounted between two face-to-face spaced cover plates 44. One of the cover plates 44 is connected to the second front cup 10 via a connecting fence 13, and the other cover plate 44 is connected to the second rear cup 11 via several connecting rods 14.

[0033] A dust collection pipe 15 is provided between any two adjacent reduction gears 42. The two ends of the dust collection pipe 15 are connected to the through holes opened on the two cover plates 44 respectively, thereby forming a medium flow channel.

[0034] The dust collection holes 7 on the second front leather cup 10 are provided one-to-one with the dust collection pipe 15;

[0035] The impeller 3 is rotatably connected to the second rear cup 11 at one end opposite to the rotating shaft 2.

[0036] The brush body 1 mentioned above is a steel brush;

[0037] The teeth 431 of the aforementioned cylindrical gear 43 are located in the central region of its inner wall, and the inner walls of the aforementioned cylindrical gear 43 located on both sides of the teeth 431 slide in contact with the outer circumferential surface of the cover plate 44.

[0038] Each of the two cover plates 44 has a radially outward flange 441 on its outer surface at one end away from each other;

[0039] The aforementioned flange 441 contacts the side surface of the brush body 1, or a steel brush pressure ring 45 is installed on the aforementioned cover plate 44 and located between the flange 441 and the brush body 1.

[0040] The pipeline cleaning device for the aforementioned oil and gas pipeline achieves stable movement within the pipeline. Simultaneously, the outer circumferential surface of the brush body, installed between the second front and second rear cups, is interference-fitted with the inner wall of the pipeline. The brush body is mounted at the front end of a rotating shaft axially aligned with the pipeline. An impeller is mounted at the rear end of the shaft. Each of the first front and second rear cups has a first vent hole, and each of the first rear and second front cups has a second vent hole in its center. The two ends of the flexible connector, which has internal flow channels, are respectively connected to the second vent holes on the first rear and second front cups. This allows the medium within the pipeline to sequentially pass through the first vent hole on the second rear cup, the flexible connector connecting the two second vent holes, and the first front cup. The first vent hole is provided, and a filter screen is provided at the front end of the second front cup and inside the cylinder. At least two dust collection holes are opened on the first rear cup and the second front cup outside their respective second vent holes. The second vent hole and dust collection hole on the first rear cup are connected to the opening of the filter screen. Without affecting the overall operating speed of the device, the impeller between the second front cup and the second rear cup is continuously driven to rotate by the medium with a large flow velocity in the pipeline, thereby driving the brush to rotate and clean the inner wall of the pipeline. This reduces the use of driving energy and maintains the continuity and stability of the driving force of the brush rotation, while improving the cleaning efficiency. It can also filter and collect the removed dust and debris to prevent dirt from mixing into the medium and affecting the quality of the medium transported in the pipeline.

[0041] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A pipeline pigging device for oil and gas transmission pipelines, comprising: A first front cup (51), a first rear cup (52), a second front cup (10), and a second rear cup (11) are arranged sequentially along the axial direction of the pipe. The first front cup (51) and the first rear cup (52) are connected by a cylindrical body (20), and the first rear cup (52) and the second front cup (10) are connected by a flexible connector (6). A brush body (1) is installed between the second front cup (10) and the second rear cup (11), and the outer circumferential surface of the brush body (1) is press-fitted with the inner wall of the pipe. The brush body (1) is installed at the front end of a rotating shaft (2) arranged along the axial direction of the pipe, and an impeller (3) is installed on the rear end of the rotating shaft (2). Each of the first front cup (51) and the second rear cup (11) is provided with a first vent hole (121), and each of the first rear cup (52) and the second front cup (10) is provided with a second vent hole (122) in the center. The two ends of the flexible connector (6) with the internal flow channel are respectively connected to the second vent holes (122) on the first rear cup (52) and the second front cup (10), so that the medium in the pipe can pass through the first vent hole (121) on the second rear cup (11) in sequence and connect the two... The flexible connector (6) of the second leakage hole (122) and the first leakage hole (121) on the first front cup (51) are provided with a filter screen (18) at the front end of the second front cup (10) and inside the cylinder (20). At least two dust collection holes (7) are opened on the first rear cup (52) and the second front cup (10) outside their respective second leakage holes (122). The second leakage hole (122) and the dust collection hole (7) on the first rear cup (52) are connected to the opening of the filter screen (18).

2. The pipeline cleaning device for oil and gas transmission pipelines according to claim 1, characterized in that: The inner diameter of the second venting hole (122) and the dust collection hole (7) is smaller than the inner diameter of the first venting hole (121).

3. The pipeline cleaning device for oil and gas transmission pipelines according to claim 1, characterized in that: The filter screen (18) has an outer part (181) that extends radially outward on its opening. The outer part (181) is connected to the front end face of the second front cup (10) via a second front cup pressure plate (19).

4. The pipeline cleaning device for oil and gas transmission pipelines according to claim 1, characterized in that: The filter screen (18) is a metal filter screen.

5. The pipeline cleaning device for oil and gas transmission pipelines according to claim 1, characterized in that: The brush body (1) is mounted on the rotating shaft (2) via a deceleration mechanism (4) with a medium flow channel.

6. The pipeline cleaning device for oil and gas transmission pipelines according to claim 5, characterized in that: The deceleration mechanism (4) further includes: a central gear (41) mounted on the rotating shaft (2) and several deceleration gears (42) arranged at equal intervals along the circumference outside the central gear (41) and meshing with the central gear (41) respectively; a cylindrical gear (43) with teeth (431) on its inner wall is mounted on the outer side of the deceleration gear (42) and meshes with each deceleration gear (42); and the brush body (1) is installed on the outer wall of the cylindrical gear (43).

7. The pipeline cleaning device for oil and gas transmission pipelines according to claim 6, characterized in that: Each of the three reduction gears (42) is rotatably mounted between two face-to-face spaced cover plates (44). One cover plate (44) is connected to the second front cup (10) via a connecting fence (13), and the other cover plate (44) is connected to the second rear cup (11) via several connecting rods (14).

8. The pipeline cleaning device for oil and gas transmission pipelines according to claim 6, characterized in that: A dust collection pipe (15) is provided between any two adjacent reduction gears (42), and the two ends of the dust collection pipe (15) are connected to the through holes opened on the two cover plates (44) respectively, thereby forming a medium flow channel.

9. The pipeline cleaning device for oil and gas transmission pipelines according to claim 8, characterized in that: The dust collection holes (7) on the second front leather cup (10) are set one-to-one with the dust collection pipe (15).

10. The pipeline cleaning device for oil and gas transmission pipelines according to claim 1, characterized in that: The impeller (3) is rotatably connected to the second rear cup (11) at one end opposite to the rotating shaft (2).

Images