Wellhead scraper device for outer wall of oil pipe with variable diameter

Abstract

The present invention relates to the technical field of oil pipe scraper devices, and is a variable diameter oil pipe outer wall wellhead scraper device; it includes a main seat body, a radial sleeve and an oil scraper assembly; the main seat body is a seat body with a vertical through channel inside; at least two radial sleeves vertically connected to the vertical channel of the main cylinder body are fixedly installed on the circumference of the main seat body, and an oil scraper assembly that automatically compresses and adjusts as the oil pipe changes in diameter is installed in each radial sleeve, and the oil scraper assembly includes an oil scraper plate and an elastic propulsion mechanism that provides telescopic power for the oil scraper plate. The present invention has a reasonable and compact structure and is easy to use; while lifting the oil pipe, the oil scraper plate can scrape off the crude oil adhering to the outside of the oil pipe, control the oil stains in the wellbore, realize pollution control from the source, eliminate environmental pollution caused by oil stains falling from the outer wall of the oil pipe, and improve the working environment around the wellhead; it not only does not take up operating time, but also does not require special personnel to operate, it is easy to operate, and has high operating efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of oil scraping devices for oil pipes, in particular to an oil scraping device for an outer wall of an oil pipe with a variable diameter. Background Art

[0002] At present, oil pipe lifting operation is a must in downhole operations and is also one of the working conditions with the highest number of construction times. Due to the adhesive nature of crude oil, the oil pipes lifted during the oil pipe lifting process are often attached with a large amount of crude oil. After the oil pipes are lifted from the wellhead, the crude oil attached to the wall of the oil pipes will fall to the wellhead, causing the deterioration of the wellhead construction working environment. When the sucker rods are deoiled, a large amount of oil-wax-containing wastewater will also be generated, which not only pollutes the environment of the construction site, but also has a bad impact on the ecological environment. Therefore, how to control pollution from the source and reduce the crude oil attached to the oil pipe is the most important way to improve the working environment, eliminate pollution, and improve working efficiency. Summary of the invention

[0003] The present invention provides a variable diameter oil pipe outer wall wellhead oil scraper device, which overcomes the above-mentioned shortcomings of the prior art and can effectively solve the problem of environmental pollution caused by a large amount of crude oil attached to the proposed oil pipe.

[0004] The technical solution of the present invention is achieved through the following measures: a variable diameter oil pipe outer wall wellhead scraper device, comprising a main seat body, a radial sleeve and an oil scraper assembly; the main seat body is a seat body with a vertical through-channel inside; at least two radial sleeves vertically connected to the vertical channel of the main cylinder body are fixedly installed on the circumference of the main seat body, and an oil scraper assembly that is automatically compressed and adjusted as the oil pipe changes diameter is installed in each radial sleeve, and the oil scraper assembly includes an oil scraper plate, a hollow propulsion shaft, a push-pull rod, a compression spring and a scraper plate support seat; hollow springs that can be axially moved and adjusted are respectively installed inside the outer end of each radial sleeve. A hollow propulsion shaft is provided in the middle of the hollow propulsion shaft, and a hollow through hole running through the front and back is provided. The outer end of the push-pull rod is radially movable and limited in the hollow through hole. The inner end of the push-pull rod is fixedly installed with a scraper support seat that can move in and out along the radial sleeve. A compression spring is sleeved on the push-pull rod between the scraper support seat and the hollow propulsion shaft, and an oil scraper plate is fixedly installed on the inner end of the scraper support seat. The inner end of the scraper plate is arc-shaped and can be butted against each other to form a closed annular oil scraper mouth, and the upper and lower end edges of the inner arc surface are respectively beveled or rounded to form an inlet push surface that can change the diameter of the oil pipe and pass through the scraper plate.

[0005] The following are further optimizations and / or improvements to the above technical solutions:

[0006] The above-mentioned scraper plates can be two layers of scraper plates, including an upper scraper plate and a lower scraper plate; the upper scraper plates can be moved toward the center of the main seat body to dock and form a closed upper annular scraper opening; the lower scraper plates can be moved toward the center of the main seat body to dock and form a closed lower annular scraper opening; the docking gaps of the upper scraper plates and the lower scraper plates are staggered and have no overlapping areas.

[0007] Four radial sleeves can be fixedly installed circumferentially on the above-mentioned main seat body, and four oil scraper assemblies are installed in the four radial sleeves; the four oil scraper assemblies include four oil scraper plates, the inner ends of the four oil scraper plates are arc-shaped and can be butted against each other to form a closed annular oil scraper mouth; the four oil scraper plates are two-layer oil scraper plates, the widths of the four upper oil scraper plates are the same, and the arc angle between the butt joints on both sides of each upper oil scraper plate is 90°; the width of the lower oil scraper plates in the front-to-back direction of the four lower oil scraper plates is greater than the width of the lower oil scraper plates in the left-to-right direction, the arc angle α between the butt joints on both sides of the lower oil scraper plates in the front-to-back direction is 130°, and the arc angle β between the butt joints on both sides of the inner ends of the lower oil scraper plates in the left-to-right direction is 50°.

[0008] The outer end of the radial sleeve may be provided with a thread, and the hollow propulsion shaft is fixedly installed in the threaded section of the radial sleeve through the thread, and the outer end of the hollow propulsion shaft is placed outside the radial sleeve; the outer end of the hollow propulsion shaft placed outside the radial sleeve is fixedly provided with a rotating handle.

[0009] A limiting ring may be provided at the inner end of the hollow through hole, and the outer end of the push-pull rod passes through the limiting ring and is placed in the hollow through hole; an outer clamping platform is provided at the outer end of the push-pull rod, and the outer clamping platform abuts against the limiting ring.

[0010] The inner end of the scraper support seat may be provided with a scraper clamping groove, and the rear end of the scraper is fixedly installed in the scraper clamping groove by at least two pins passing through the upper and lower ends; the outer end of the scraper support seat is provided with a T-shaped groove, and the inner end of the push-pull rod is provided with a T-shaped connector, which is placed in the T-shaped groove.

[0011] The above-mentioned oil scraper plate can be a soft scraper rubber plate; or / and, an upper flange and a lower flange are respectively fixed at the upper and lower ends of the main seat body, and two groups of connecting holes with different center distances are respectively provided on the upper flange and the lower flange; or / and, an oil-blocking cover is fixedly installed at the upper port of the vertical channel of the main seat body.

[0012] The invention has a reasonable and compact structure and is easy to use. When lifting the oil pipe, the scraper plate can scrape off the crude oil adhering to the outside of the oil pipe, control the oil pollution in the wellbore, control the pollution from the source, prevent the environmental pollution caused by the oil pollution falling from the outer wall of the oil pipe, and improve the working environment around the wellhead. Moreover, the scraping of the oil pipe and the lifting of the oil pipe are carried out simultaneously, which not only does not take up the operation time, but also does not require special personnel to operate, and the operation is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a schematic diagram of the main cross-sectional structure of the best embodiment of the present invention.

[0014] Attached Figure 2 For attachment Figure 1 Schematic diagram of the cross-sectional structure along the AA axis.

[0015] The codes in the accompanying drawings are: 1 is the main seat body, 2 is the radial sleeve, 3 is the oil pipe, 4 is the hollow propulsion shaft, 5 is the hollow through hole, 6 is the limit ring platform, 7 is the push-pull rod, 8 is the external clamping platform, 9 is the scraper support seat, 10 is the compression spring, 11 is the connecting hole, 12 is the upper scraper plate, 13 is the lower scraper plate, 14 is the docking gap, 15 is the upper flange, 16 is the lower flange, 17 is the T-slot, 18 is the oil baffle cover, 19 is the pin shaft, α is the arc angle between the docking points on both sides of the lower scraper plate in the front-to-back direction, and β is the arc angle between the docking points on both sides of the inner end of the lower scraper plate in the left-right direction. DETAILED DESCRIPTION

[0016] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0017] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The layout is described in detail, such as the positional relationship of top, bottom, left, right, etc. is based on the instructions attached to the manual. Figure 1 It is determined by the layout direction.

[0018] The present invention will be further described below in conjunction with embodiments and drawings:

[0019] As attached Figure 1As shown, the variable diameter oil pipe outer wall wellhead scraper device comprises a main seat body 1, a radial sleeve 2 and an oil scraper assembly; the main seat body 1 is a seat body with a vertical through-channel inside; at least two radial sleeves 2 vertically connected to the vertical channel of the main cylinder body are fixedly installed on the circumference of the main seat body 1, and an oil scraper assembly that is automatically compressed and adjusted as the oil pipe 3 changes in diameter is installed in each radial sleeve 2, and the oil scraper assembly comprises an oil scraper plate, a hollow propulsion shaft 4, a push-pull rod 7, a compression spring 10 and a scraper plate support seat 9; a hollow propulsion shaft 4 that can be axially moved and adjusted is installed inside the outer end of each radial sleeve 2, and a hollow propulsion shaft 4 that can be axially moved and adjusted is installed in the hollow push-pull rod 7. A hollow through hole 5 is provided in the middle of the advance shaft 4 and runs through it from front to back. The outer end of the push-pull rod 7 is radially movable and limitedly sleeved in the hollow through hole 5. A scraper support seat 9 which can move inward and outward along the radial sleeve 2 is fixedly installed on the inner end of the push-pull rod 7. A compression spring 10 is sleeved on the push-pull rod 7 between the scraper support seat 9 and the hollow propulsion shaft 4. An oil scraper plate is fixedly installed on the inner end of the scraper support seat 9. The inner end of the scraper plate is arc-shaped and can be butted against each other to form a closed annular scraper mouth. The upper and lower end edges of the inner arc surface are respectively beveled or rounded to form an introduction push surface that can change the diameter of the oil pipe 3 and pass through the scraper plate. When in use, the oil scraper device is installed on the wellhead blowout preventer; by adjusting the hollow propulsion shaft 4 inward, the hollow propulsion shaft 4 compresses the compression spring 10 inward, and the compression spring 10 applies a pressing force to the scraper support seat 9 and the scraper plate, so that the scraper plate can press against the outer wall of the oil pipe 3; while pressing, the scrapers extending from each radial sleeve 2 to the main seat body 1 can be connected to form a closed annular scraper mouth, and the oil pipe 3 is clamped through the annular scraper mouth, and while lifting the oil pipe 3, all the crude oil adhering to the outside of the oil pipe 3 can be scraped off, and the oil pollution can be controlled in the wellbore, so as to control pollution from the source, prevent environmental pollution caused by oil pollution falling from the outer wall of the oil pipe 3, and improve the surrounding area of ​​the wellhead. Working environment; and the oil scraping of the oil pipe 3 and the lifting of the oil pipe 3 are carried out simultaneously, which not only does not take up operating time, but also does not require special personnel to operate, and is easy to operate and has high operating efficiency; wherein, the downhole oil pipe 3 is usually connected by a coupling, and the outer diameter of the coupling part is slightly larger than the outer diameter of the oil pipe 3. Therefore, in the present oil scraping device, the scraper plate is not only tightened by the compression spring 10 to improve the oil scraping effect, but also when the oil pipe 3 transitions from a narrow diameter section to a wide diameter section, the compression spring 10 is compressed outwardly by the scraper plate to open the annular scraping mouth of the scraper plate, so that the wide diameter section of the oil pipe 3 can pass through the scraper plate smoothly, meeting the actual use requirements; the upper and lower introduction push surfaces of the scraper plate play the role of transition guide.

[0020] According to actual needs, the above-mentioned variable diameter oil pipe outer wall wellhead scraper device can be further optimized and / or improved:

[0021] As attached Figure 1As shown, the scraper plates are two layers, including an upper scraper plate 12 and a lower scraper plate 13; the upper scraper plates 12 can be moved toward the center of the main seat body 1 to dock and form a closed upper annular scraper opening; the lower scraper plates 13 can be moved toward the center of the main seat body 1 to dock and form a closed lower annular scraper opening; the docking gaps 14 of the upper scraper plates 12 and the docking gaps 14 of the lower scraper plates 13 are staggered and have no overlapping areas. When in use, after the lower scraper plate 13 scrapes the oil once, the upper scraper plate 12 scrapes the oil for a second time, and the scraping effect is better; because the scraper plate is worn when scraping the oil, the two-layer scraper plate can ensure that the upper scraper plate 12 can still scrape the oil even after the lower scraper plate 13 is worn, and the service life is long; in addition, the butt joint gap 14 of the upper scraper plate 12 and the butt joint gap 14 of the lower scraper plate 13 are staggered and have no overlapping area, which can avoid the leakage of crude oil at the butt joint gap 14 of the scraper plate, so that the scraping effect is better; the scraper plate can also be a multi-layer scraper plate.

[0022] For best results, please Figure 2 As shown, four radial sleeves 2 are fixedly installed circumferentially on the main seat body 1, and four oil scraper assemblies are installed in the four radial sleeves 2; the four oil scraper assemblies include four oil scraper plates, the inner ends of the four oil scraper plates are arc-shaped and can be butted against each other to form a closed annular oil scraper mouth; the four oil scraper plates are two-layer oil scraper plates, the widths of the four upper oil scraper plates 12 are the same, and the arc angle between the butt joints on both sides of each upper oil scraper plate 12 is 90°; the width of the front-to-back lower oil scraper plates 13 of the four lower oil scraper plates 13 is greater than the width of the left-to-right lower oil scraper plates 13, the arc angle α between the butt joints on both sides of the front-to-back lower oil scraper plates 13 is 130°, and the arc angle β between the butt joints on both sides of the inner ends of the left-to-right lower oil scraper plates 13 is 50°.

[0023] As attached Figure 1 , 2 As shown, the outer end of the radial sleeve 2 is provided with a thread, the hollow propulsion shaft 4 is fixedly installed in the threaded section of the radial sleeve 2 through the thread, and the outer end of the hollow propulsion shaft 4 is placed outside the radial sleeve 2; a rotating handle is fixedly installed on the outer end of the hollow propulsion shaft 4 placed outside the radial sleeve 2. When in use, the rotating handle is manually rotated to make the hollow propulsion shaft 4 rotate and move in the radial sleeve 2 to adjust the clamping force of the oil scraper; this is not only convenient to operate, but also has high adjustment accuracy and reliable transmission.

[0024] As attached Figure 1 , 2As shown, a limiting ring 6 is provided at the inner end of the hollow through hole 5, and the outer end of the push-pull rod 7 passes through the limiting ring 6 and is placed in the hollow through hole 5; an outer clamping platform 8 is provided at the outer end of the push-pull rod 7, and the outer clamping platform 8 abuts against the limiting ring 6. Among them, the limiting ring 6 plays a role in radial movement limiting for the push-pull rod 7 and the outer clamping platform 8.

[0025] In order to facilitate the disassembly and assembly between the scraper plate, the scraper plate support seat 9 and the push-pull rod 7, as shown in the attached Figure 1 , 2 As shown, the inner end of the scraper support seat 9 is provided with a scraper clamping groove, and the outer end of the scraper is fixedly installed in the scraper clamping groove through at least two pins 19 that penetrate up and down; the outer end of the scraper support seat 9 is provided with a T-shaped groove 17, and the inner end of the push-pull rod 7 is provided with a T-shaped connector, and the T-shaped connector is placed in the T-shaped groove 17. Since the scraper is worn after long-term use, in order to facilitate disassembly and replacement, the entire scraper assembly can be screwed out from the radial sleeve 2 in turn, and after screwing out, the scraper support seat 9 and the scraper are connected to the push-pull rod 7 through the T-shaped connector, and then the scraper is replaced, which is more convenient to operate; the T-shaped connector is used for connection, mainly considering that once the scraped crude oil enters the radial sleeve 2, it is easy to make the connection between the push-pull rod 7 and the scraper support seat 9 stick, and the connection mode of the T-shaped connector and the T-shaped groove 17 can not only meet the limit requirements, but also is very convenient for insertion and installation, and is not easy to be stuck by crude oil, further reducing the difficulty of disassembly and assembly.

[0026] As needed, the oil scraper plate adopts a soft scraper rubber plate; the soft scraper rubber plate has better flexibility and toughness and longer service life.

[0027] As attached Figure 1 As shown, in order to facilitate the installation of the main seat body 1 on the wellhead device, an upper flange 15 and a lower flange 16 are fixed to the upper and lower ends of the main seat body 1 respectively.

[0028] In order to meet the needs of flange connections of different specifications and sizes, as shown in the attached Figure 1 As shown, two groups of connecting holes 11 with different center distances are respectively provided on the upper flange 15 and the lower flange 16.

[0029] As attached Figure 1 As shown, an oil-blocking cover 18 is fixedly installed at the upper end of the vertical channel of the main seat body 1 .

[0030] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A variable diameter oil pipe outer wall wellhead scraper device, characterized in that It comprises a main seat body, a radial sleeve and an oil scraper assembly; the main seat body is a seat body provided with a vertical through channel; at least two radial sleeves vertically connected to the vertical channel of the main cylinder body are fixedly installed on the circumference of the main seat body, and an oil scraper assembly which is automatically compressed and adjusted as the oil pipe changes in diameter is installed in each radial sleeve, and the oil scraper assembly comprises an oil scraper plate, a hollow propulsion shaft, a push-pull rod, a compression spring and a scraper support seat; a hollow propulsion shaft which can be axially moved and adjusted is installed inside the outer end of each radial sleeve, a hollow through hole which runs through the front and back is provided in the middle of the hollow propulsion shaft, and the radial movement limit sleeve of the outer end of the push-pull rod is installed in the hollow through hole; a scraper support seat which can move inward and outward along the radial sleeve is fixedly installed on the inner end of the push-pull rod, and a push spring between the scraper support seat and the hollow propulsion shaft is provided. A compression spring is installed on the pull rod, and an oil scraper plate is fixedly installed on the inner end of the scraper support seat; the inner end of the oil scraper plate is arc-shaped and can be butted against each other to form a closed annular oil scraper mouth, and the upper and lower end edges of the inner arc surface are respectively beveled or rounded to form an introduction push surface that can make the oil pipe change its diameter so that it can pass through the oil scraper plate. The oil scraper plate is a two-layer oil scraper plate, including an upper scraper plate and a lower scraper plate; the upper scraper plates can move toward the center of the main seat body to butt against each other and form a closed upper annular oil scraper mouth; the lower scraper plates can move toward the center of the main seat body to butt against each other and form a closed lower annular oil scraper mouth; the butt gap between the upper scraper plate and the lower scraper plate is staggered and has no overlapping area, and four radial sleeves are fixedly installed on the circumference of the main seat body, and a spring is installed in the four radial sleeves. Four oil scraper assemblies are installed; the four oil scraper assemblies include four oil scraper plates, the inner ends of the four oil scraper plates are arc-shaped and can be butted against each other to form a closed annular oil scraper mouth; the four oil scraper plates are two layers of oil scraper plates, the width of the four upper oil scraper plates is the same, and the arc angle between the butt joints on both sides of each upper oil scraper plate is 90°; the width of the lower oil scraper plates in the front-to-back direction of the four lower oil scraper plates is greater than the width of the lower oil scraper plates in the left-to-right direction, the arc angle α between the butt joints on both sides of the lower oil scraper plates in the front-to-back direction is 130°, and the arc angle β between the butt joints on both sides of the inner ends of the lower oil scraper plates in the left-to-right direction is 50°, a thread is provided inside the outer end of the radial sleeve, the hollow propulsion shaft is fixedly installed in the threaded section of the radial sleeve by a thread, and the outer end of the hollow propulsion shaft is placed outside the radial sleeve ; A rotating handle is fixedly installed on the outer end of the hollow propulsion shaft placed outside the radial sleeve; a limit ring is provided at the inner end of the hollow through hole, and the outer end of the push-pull rod passes through the limit ring and is placed in the hollow through hole; an external clamping platform is provided at the outer end of the push-pull rod, and the external clamping platform is against the limit ring, and a scraper clamping groove is provided at the inner end of the scraper support seat, and the rear end of the scraper is fixedly installed in the scraper clamping groove by at least two pins passing through the upper and lower parts; a T-shaped groove is provided at the outer end of the scraper support seat, and a T-shaped connector is provided at the inner end of the push-pull rod, and the T-shaped connector is placed in the T-shaped groove, and the scraper adopts a soft scraping rubber plate; an upper flange and a lower flange are fixed at the upper and lower ends of the main seat body, respectively, and two groups of connecting holes with different center distances are respectively provided on the upper flange and the lower flange; an oil-blocking cover is fixedly installed at the upper end of the vertical channel of the main seat body.

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