Oil wellhead pollution prevention device

Abstract

The present invention relates to the technical field of oil pipe scrapers, and in particular to an oil wellhead anti-pollution device. The oil wellhead anti-pollution device comprises a support seat fixed to the wellhead when in use and a plug fixed to the support seat, the plug is used to be inserted into the wellhead of the oil well, an annular oil scraper is arranged in the plug, and the annular oil scraper is used to scrape the oil on the outside of the oil pipe when the oil pipe is lifted upward; a recovery chamber is arranged in the wall of the plug, and a collecting port is arranged on the wall of the recovery chamber, which is located at the lower side of the annular oil scraper and connects the recovery chamber with the internal channel of the plug, and the oil wellhead anti-pollution device comprises a drainage structure arranged corresponding to the collection port, and the drainage structure is used to guide the oil scraped off by the annular oil scraper into the recovery chamber.

Description

Technical Field

[0001] The invention relates to the technical field of oil pipe scrapers, in particular to an oil wellhead anti-pollution device. Background Art

[0002] During the oil production process in an oil field, it is often necessary to replace the oil pipe. When performing this operation, the oil pipe usually needs to be hoisted up from the oil well. Since there is usually oil stain adhering to the outer wall of the oil pipe, after the oil pipe is hoisted out of the wellhead, the oil stain adhering to the outer wall of the oil pipe will fall to the wellhead. The accumulated oil stain will cause environmental pollution at the wellhead, and the labor intensity of the workers will be increased when handling the oil stain at the wellhead.

[0003] The Chinese utility model patent with authorization announcement number CN207048717U discloses an anti-pollution device for oil well operation wellhead, which includes a plug pipe inserted into the wellhead of the oil well (i.e., the rubber sleeve in the patent), a support seat fixed to the plug pipe (i.e., the box in the patent), and an annular oil scraper (i.e., the annular boss in the patent) arranged inside the plug pipe. When the oil pipe is lifted upward, the annular oil scraper can scrape off the oil stains on the outside of the oil pipe, and the scraped oil stains will fall into the oil well, thus preventing the oil stains on the outside of the oil pipe from falling to the wellhead and causing environmental pollution.

[0004] The above device solves the problem of wellhead pollution, but the scraped oil falls back into the oil well, and this part of resources cannot be recycled and reused, which causes a waste of resources to a certain extent. Summary of the invention

[0005] The purpose of the present invention is to provide an oil well head anti-pollution device to solve the technical problem in the prior art that the oil scraped off the outside of the oil pipe is not recycled and reused, resulting in waste of resources.

[0006] The technical solution of the oil wellhead pollution prevention device of the present invention is:

[0007] The oil wellhead pollution prevention device comprises a support seat fixedly arranged at the wellhead when in use and a plug fixedly arranged on the support seat, the plug is used to be inserted into the wellhead of the oil well, an annular oil scraper is arranged in the plug, and the annular oil scraper is used to scrape the oil dirt on the outside of the oil pipe when the oil pipe is lifted upward; a recovery cavity is arranged in the wall of the plug, and a collecting port located at the lower side of the annular oil scraper and connecting the recovery cavity with the inner channel of the plug is opened on the cavity wall of the recovery cavity, and the oil wellhead pollution prevention device comprises an inlet arranged corresponding to the collecting port The flow structure is used to guide the oil and dirt scraped off by the annular scraper to the recovery chamber. The oil wellhead anti-pollution device includes an oil suction pipe connected to the recovery chamber to suck the oil and dirt in the recovery chamber to the outside. An oil scraper plate is installed in the recovery chamber to guide it to move in the up and down directions. The oil scraper plate can scrape off the oil and dirt on the wall of the recovery chamber. An air bag is also provided in the recovery chamber below the oil scraper plate. The air bag is connected to an air guide pipe. The air guide pipe is used to supply air to the air bag to expand the air bag and push the oil scraper plate upward.

[0008] Beneficial effects: When the oil wellhead anti-pollution device is in use, the insert is inserted into the oil well, and the support seat is fixed at the wellhead to prevent the insert from falling into the oil well. When the oil pipe is lifted upward, the inner wall of the annular scraper will scrape off the oil on the outside of the oil pipe. After the oil is scraped off, it will flow into the recovery chamber through the collection port under the guidance of the drainage structure. The oil wellhead anti-pollution device of the present invention can scrape off and collect the oil on the outside of the oil pipe during the process of lifting the oil pipe outward, effectively preventing the oil from falling to the wellhead and polluting the wellhead environment, and the oil collected in the recovery chamber can be reused, avoiding waste of resources. The use of a pumping pipe to suck the oil collected in the recovery chamber to the outside is more efficient. When the air pipe delivers air to the air bag, the air bag expands and pushes the scraper plate upwards. The scraper plate pushes upwards the residual oil at the bottom of the recovery chamber that is not easily sucked away by the oil extraction pipe. When the scraper plate moves upwards, it scrapes off the oil adhering to the wall of the recovery chamber and pushes upwards, so that the oil extraction pipe can suck away the oil accumulated on the scraper plate. In this way, the recovered oil can be reused more fully.

[0009] Furthermore, the recovery cavity is an annular cavity, and a plurality of the collecting ports are arranged at intervals along the circumference of the cannula, and the drainage structure includes drainage pieces arranged at each collecting port.

[0010] Beneficial effects: The recovery chamber is an annular chamber with a simple structure and is more convenient to process. In addition, each collection port is provided with a drainage piece, which has a higher efficiency in collecting oil pollution.

[0011] Furthermore, the drainage member is a wheel rotatably installed in the collection port, and the rotation axis of the wheel is perpendicular to the axis of the insert tube. When in use, the wheel fits against the outer wall of the oil pipe to drive the wheel to rotate when the oil pipe is lifted upward; a plurality of oil collecting grooves are arranged circumferentially around the wheel on the outer peripheral surface of the wheel, and each oil collecting groove is used to receive the oil and dirt scraped off by the annular scraper and pour the oil and dirt in the oil collecting groove into the recovery chamber when the wheel rotates.

[0012] Beneficial effects: the automatic acceptance and dumping of oil pollution is realized, and the rotation of the rotating wheel will not hinder the lifting of the cannula.

[0013] Furthermore, a guide plate is provided on the inner wall of the recovery chamber, and the guide plate abuts against the outer peripheral surface of the runner to scrape off the oil stains outside the runner and drop them into the recovery chamber to prevent the oil stains from being brought out again.

[0014] Beneficial effect: The oil stains on the outside of the rotor are scraped off and dropped into the recovery chamber through the drainage plate, preventing the oil stains from entering the collection port or returning to the cannula.

[0015] Furthermore, the annular oil scraper is a scraper cylinder, which is a cylinder with an inner diameter gradually decreasing from bottom to top, and the top end of the scraper cylinder is used to scrape off oil stains on the outside of the oil pipe.

[0016] Beneficial effect: the scraper barrel is a barrel with an inner diameter that gradually decreases from bottom to top, so that the oil pipe can be more easily aligned with the bottom opening of the scraper barrel when moving from bottom to top, and the oil pipe can pass through the scraper barrel more smoothly.

[0017] Furthermore, the support seat includes a fixed seat body fixed to the outside of the cannula, and a movable seat body movably inserted in the fixed seat body along the circumference of the cannula. The fixed seat body and the movable seat body are both semi-ring structures. The movable seat body can be accommodated in the fixed seat body, and can also slide out of the fixed seat body and cooperate with the fixed seat body to form an annular support seat; the support seat also includes a fixing structure that fixes the fixed seat body and the movable seat body together after the movable seat body slides out to the limit position.

[0018] Beneficial effect: With this structural form of the support seat, during the process of inserting the cannula into the wellhead, the movable seat body can be accommodated in the fixed seat body first, so that the centering of the cannula can be observed on the side opposite to the fixed seat body, so as to facilitate the smooth insertion of the cannula.

[0019] Furthermore, a cone foot is provided at the bottom of the support seat, and the cone foot is used to be inserted into the ground at the wellhead of the oil well.

[0020] Beneficial effect: The setting of the cone foot makes the fixation of the support seat more stable and reliable.

[0021] Furthermore, an anti-collision gasket is fixedly provided on the inner wall of the upper end of the insertion tube.

[0022] Beneficial effect: The provision of the anti-collision gasket can effectively buffer the impact of the oil pipe on the cannula, reducing the probability of the cannula being deformed by the impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the oil wellhead pollution prevention device in Embodiment 1 of the present invention;

[0024] Figure 2 yes Figure 1 A top view of

[0025] Figure 3 yes Figure 2 Schematic diagram from another perspective;

[0026] Figure 4 It is a schematic diagram of the coordination of the cannula, the rotating wheel and the oil pipe in Example 1 of the oil wellhead pollution prevention device of the present invention;

[0027] Figure 5 It is a schematic structural diagram of the rotor in Example 1 of the oil wellhead pollution prevention device of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the scraper in Example 1 of the oil wellhead pollution prevention device of the present invention.

[0029] Explanation of the reference numerals: 1. Insert tube; 2. Scraper cylinder; 3. Through channel; 4. Recovery chamber; 5. Collecting port; 6. Rotor; 7. Axle; 8. Oil collecting trough; 9. Drainage plate; 10. Oil extraction pipe; 11. Oil scraper plate; 12. Air bag; 13. Air guide pipe; 14. Anti-collision gasket; 15. Support seat; 16. Fixed seat body; 17. Movable seat body; 18. Guide block; 19. Slide groove; 20. Conical foot; 21. Oil pipe; 22. Locking bolt; 23. Guide groove. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0032] It should be noted that, in the specific implementation of the present invention, the terms that may appear, such as "first" and "second", etc., are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of such an actual relationship or order between these entities or operations. Moreover, the terms that may appear, such as "include", "comprise" or any other variants 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 other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the phrase "including a ..." and other defined elements that may appear do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms that may appear, such as "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The present invention is described in further detail below in conjunction with embodiments.

[0036] Embodiment 1 of the oil wellhead pollution prevention device provided in the present invention:

[0037] like Figures 1 to 6As shown, the oil wellhead pollution prevention device includes a plug tube 1, a support seat 15 fixed on the outer periphery of the plug tube 1 and located on the upper part of the plug tube 1, and a scraper barrel 2 fixed in the internal channel of the plug tube 1. The plug tube 1 is inserted into the wellhead of the oil well when in use. The support seat 15 is supported and fixed on the ground at the wellhead to prevent the plug tube 1 from falling into the oil well. The scraper barrel 2 has a through channel 3 that passes through from top to bottom for the oil pipe 21 to pass through. When the oil pipe 21 is lifted upward from the oil well, when the oil pipe 21 passes through the scraper barrel 2 from bottom to top, the inner wall of the scraper barrel 2 will scrape off the oil stains on the outside of the oil pipe 21, and the scraped oil stains will flow downward along the inner wall of the scraper barrel 2 and the inner wall of the plug tube 1. The oil wellhead pollution prevention device also includes a drainage structure and a recovery chamber 4 arranged in the wall of the insert tube 1. The wall of the recovery chamber 4 is provided with a collecting port 5 located on the lower side of the scraper 2 and connecting the recovery chamber 4 with the internal channel of the insert tube 1. The drainage structure can guide the oil pollution flowing down the wall of the insert tube 1 into the recovery chamber 4.

[0038] In this embodiment, the scraper barrel 2 is a cylinder whose inner diameter gradually decreases from bottom to top, so that the bottom opening diameter of the scraper barrel 2 is larger than the top opening diameter, and the oil pipe 21 is more easily entered into the through channel 3 in the scraper barrel 2 when moving from bottom to top, and the top of the scraper barrel 2 scrapes the oil on the outside of the oil pipe 21. The scraper barrel 2 is fixed between the insert pipe 1 and the scraper barrel 2 by bolts installed along the radial direction of the insert pipe 1. In this embodiment, the scraper barrel 2 constitutes an annular oil scraper for scraping the oil on the outside of the oil pipe 21 when the oil pipe 21 is lifted upward.

[0039] like Figure 1 , Figure 4 As shown, the recovery chamber 4 is an annular chamber arranged around the cannula 1, and a plurality of collecting ports 5 are arranged and each collecting port 5 is evenly distributed along the circumference of the cannula 1. In this embodiment, the drainage structure includes a runner 6 rotatably installed in the collecting port 5, and the rotation axis of the runner 6 is perpendicular to the axis of the cannula 1, and the wheel axle 7 of the runner 6 is fixed on the side wall of the collecting port 5. The runner 6 is arranged in plurality and corresponds to the collecting port 5 one by one. The runner 6 is a circular disk, and a plurality of fan-shaped oil collecting grooves 8 are evenly distributed around the runner 6 on the outer circumference of the runner 6. The oil collecting groove 8 can receive the oil stains flowing down from the inner wall of the cannula 1 (i.e., the oil stains scraped off by the scraper 2). When the oil pipe 21 passes through the plane where the wheel axle 7 of each runner 6 is located, each runner 6 can be attached to the outer wall of the oil pipe 21 and can be driven by the oil pipe 21 to rotate, and the rotating runner 6 can pour the oil stains collected in the oil collecting groove 8 into the recovery chamber 4. In addition, an inclined drain plate 9 is provided on the lower side of the impeller 6. The drain plate 9 is fixed on the cavity wall of the recovery chamber 4, and one end of the drain plate 9 extends into the recovery chamber 4, and the other end abuts against the outer peripheral surface of the impeller 6. When the impeller 6 rotates, the drain plate 9 can scrape the oil stains on the outside of the impeller 6 and drop them into the recovery chamber 4 to prevent the oil stains from being brought out again, so that the recovery rate of the oil stains is higher.

[0040] In order to facilitate the unified recovery and treatment of the oil stored in the recovery chamber 4, the oil wellhead anti-pollution device also includes an oil pumping pipe 10 inserted into the pipe wall of the insert pipe 1 and an oil pump connected to the oil pumping pipe 10. The upper end of the oil pumping pipe 10 extends from the top of the insert pipe 1 and is connected to the oil pump, and the lower end extends into the recovery chamber 4. The oil pump is placed outside the wellhead when in use. After the oil pump is started, the oil in the recovery chamber 4 will be pumped out, and the pumped oil will be stored and uniformly recovered for reuse.

[0041] An oil scraper plate 11 is installed in the recovery chamber 4 for upward and downward movement, and the oil wellhead pollution prevention device also includes an air bag 12 located at the lower side of the oil scraper plate 11, an air guide tube 13 connected to the air bag 12, and an air pump connected to the air guide tube 13. The oil scraper plate 11 is an annular plate body, and the inner and outer circumferential sides of the oil scraper plate 11 are both in contact with the cavity wall of the recovery chamber 4. The air guide tube 13 is installed in the tube wall of the cannula 1, the upper end of the air guide tube 13 extends from the top of the cannula 1 and is connected to the air pump, and the lower end extends into the recovery chamber 4 and passes through the oil scraper plate 11 to be connected to the air bag 12. The oil scraper plate 11 is provided with a through hole for the air guide tube 13 to pass through. The air pump needs to be placed outside the wellhead when in use. When the air pump is inflated, the airbag 12 expands and pushes the scraper plate 11 upward. The scraper plate 11 pushes the residual oil at the bottom of the recovery chamber 4 that is not easily sucked away by the pumping pipe 10 upward, and the scraper plate 11 scrapes the oil adhered to the wall of the recovery chamber 4 and pushes it upward when moving upward. After the inflation is completed, the scraper plate 11 stops moving, and the pumping pipe 10 can suck away the oil accumulated on the scraper plate 11. When the air pump is pumping air, the airbag 12 shrinks, and the scraper plate 11 will fall back to the bottom of the recovery chamber 4 with the airbag 12.

[0042] In addition, in order to cushion the impact of the oil pipe 21 on the insert pipe 1 during the upward lifting process and reduce the probability of the insert pipe 1 being deformed by the impact, an annular anti-collision gasket 14 is fixedly provided on the inner wall of the upper end of the insert pipe 1.

[0043] like Figure 1 , Figure 2 , Figure 3As shown, the support seat 15 includes a fixed seat body 16 and a movable seat body 17, both of which are semi-ring structures, and the cross-sections of the fixed seat body 16 and the movable seat body 17 are rectangular. The fixed seat body 16 is welded and fixed on the outer peripheral surface of the cannula 1, and a movable cavity extending along the extension direction of the fixed seat body 16 and penetrating the fixed seat body 16 is provided in the fixed seat body 16, and the movable seat body 17 is movably inserted in the movable cavity of the fixed seat body 16 along the circumferential direction of the cannula 1. One end of the movable seat body 17 is a driving end, and a guide block 18 is provided on the driving end and on the outer arc surface of the movable seat body 17. Correspondingly, a guide groove 23 is provided on the outer arc surface of the fixed seat body 16, and the guide block 18 is movably installed in the guide groove 23 and extends outward from the guide groove 23, so that the movable seat body 17 can be driven to move back and forth in the movable cavity by pushing the guide block 18. The other end of the movable seat body 17 is an insertion end, and bolt through holes are correspondingly provided on the insertion end and the fixed seat body 16 .

[0044] The movable seat body 17 can be completely retracted into the movable cavity (i.e., the movable seat body 17 can be accommodated in the fixed seat body 16), or the insertion end can be slid out of the opening at one end of the movable cavity and inserted into the other opening of the movable cavity. At this time, the locking bolt 22 is inserted into the bolt through-holes on the insertion end and the fixed seat body 16 to fix the fixed seat body 16 and the movable seat body 17, and the fixed seat body 16 and the movable seat body 17 form a ring-shaped support seat 15. It should be noted that the guide block 18 and the guide groove 23 can stop and cooperate to prevent the movable seat body 17 from detaching from the fixed seat body 16. The position where the guide block 18 moves to the stop and cooperate with the guide groove 23 is the limit position where the movable seat body 17 can slide out. In this embodiment, the bolt through-holes and the locking bolts 22 are correspondingly provided on the fixed seat body 16 and the movable seat body 17 to form a fixed structure that fixes the fixed seat body 16 and the movable seat body 17 together after the movable seat body 17 slides out to the limit position.

[0045] A slide groove 19 is also provided on the outer peripheral surface of the cannula 1 and is arranged around the cannula 1. When the insertion end of the movable seat body 17 slides out of the movable cavity and moves around the cannula 1, the movable seat body 17 slides in cooperation with the slide groove 19, and the slide groove 19 can guide and support the movable seat body 17.

[0046] In addition, in order to make the support base 15 more stable when supported and fixed on the ground, a plurality of cone feet 20 are provided on the side of the fixing base body 16 for supporting on the ground. The cone feet 20 are cone-shaped and are used to be inserted into the ground.

[0047] It should be emphasized that the cannula 1 is formed by two parts, the upper and lower parts, which are spliced ​​together. After the annular cavities are processed on the upper and lower parts respectively, the upper and lower parts are spliced ​​and fixed to form a complete cannula 1. At this time, the annular cavities on the upper and lower parts form a recovery cavity 4.

[0048] When the oil wellhead pollution prevention device is used, the movable seat body 17 is first fully retracted into the movable cavity of the fixed seat body 16, and then the cannula 1 is inserted into the wellhead. During the insertion process, the centering of the cannula 1 can be observed through one side of the slide groove 19, so as to facilitate the smooth insertion of the cannula 1. After the cannula 1 is fully inserted, the fixed seat body 16 is fixed on the ground through the cone foot 20. At this time, the movable seat body 17 can be slid out of the fixed seat body 16 and the fixed seat body 16 and the movable seat body 17 are fixed. After the support seat 15 formed by the fixed seat body 16 and the movable seat body 17 is supported on the ground, the subsequent work of lifting the oil pipe 21 upward from the oil well can be carried out.

[0049] It should be noted that when the oil pipe 21 passes through the impeller 6, it will drive the impeller 6 to rotate. During this process, part of the oil stains on the outside of the oil pipe 21 will also be scraped off by the impeller 6. However, on the one hand, there is a gap between two adjacent impellers 6, and on the other hand, the impeller 6 rotates with the impeller 6, and its scraping force on the oil stains on the outside of the oil pipe 21 is relatively small.

[0050] Embodiment 2 of the oil wellhead anti-pollution device provided in the present invention is different from Embodiment 1 in that an annular protrusion is provided on the inner wall of the insert tube, and the annular protrusion constitutes an annular oil scraper. When the oil pipe passes through the annular protrusion, the annular protrusion will scrape off the oil stains on the outside of the oil pipe.

[0051] Embodiment 3 of the oil well wellhead pollution prevention device provided in the present invention is different from Embodiment 1 in that, in this embodiment, the guide member is a guide plate, which is a straight plate body and is arranged obliquely. The guide plate is fixed at the collecting port, and one end of the guide plate extends obliquely downward into the recovery chamber, and the other end extends obliquely upward into the internal channel of the insert tube. The oil scraped off by the scraper will drip onto the guide plate and flow into the recovery chamber along the guide plate. It should be noted that the end of the guide plate facing the axis of the insert tube is spaced from the oil pipe when in use to prevent the guide plate from scraping off the oil on the outside of the oil pipe.

[0052] Embodiment 4 of the oil wellhead anti-pollution device provided in the present invention is different from embodiment 1 in that no oil pumping pipe and oil pump are provided in this embodiment, and after the oil pipe is pulled out, the oil in the recovery chamber is poured out through the collection port.

[0053] Embodiment 5 of the oil wellhead anti-pollution device provided in the present invention is different from Embodiment 1 in that, in this embodiment, the support seat includes two semi-ring seat bodies that are radially matched, the two semi-ring seat bodies are independent of each other and can be connected together, and one of the two semi-ring seat bodies is fixed on the cannula. In other embodiments, the support seat can be an integrated annular seat body. It can also be a box body as in the prior art cited in the background technology.

[0054] Embodiment 6 of the oil wellhead pollution prevention device provided in the present invention is different from Embodiment 1 in that, in this embodiment, the recovery chamber includes a plurality of arc-shaped chambers, each arc-shaped chamber is evenly distributed around the cannula, and each arc-shaped chamber has a corresponding collection port. Alternatively, in other embodiments, each arc-shaped chamber has at least two collection ports.

[0055] Embodiment 7 of the oil well wellhead pollution prevention device provided in the present invention is different from Embodiment 1 in that, in this embodiment, no conical feet are provided at the bottom of the support seat, and the support seat can be placed directly on the ground at the wellhead, or a flange can be fixed at the wellhead and the support seat can be fixedly installed on the flange.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. An oil wellhead anti-pollution device, comprising a support seat (15) fixed to the wellhead when in use and a plug (1) fixed to the support seat (15), the plug (1) being used to be inserted into the wellhead of the oil well, an annular oil scraper being provided inside the plug (1), the annular oil scraper being used to scrape off oil stains on the outside of the oil pipe (21) when the oil pipe (21) is lifted upward; characterized in that: A recovery chamber (4) is provided in the wall of the insert tube (1); a collecting port (5) is provided on the wall of the recovery chamber (4) and is located below the annular oil scraper and connects the recovery chamber (4) with the internal passage of the insert tube (1); the oil wellhead anti-pollution device comprises a drainage structure arranged corresponding to the collecting port (5); the drainage structure is used to guide the oil dirt scraped off by the annular oil scraper into the recovery chamber (4); the oil wellhead anti-pollution device comprises an oil pumping pipe (10) connected to the recovery chamber (4); In order to suck the oil in the recovery chamber (4) to the outside, an oil scraper plate (11) is installed in the recovery chamber (4) to be guided and moved in the up-down direction, and the oil scraper plate (11) can scrape off the oil on the wall of the recovery chamber (4); the recovery chamber (4) is also provided with an air bag (12) located below the oil scraper plate (11), and the air bag (12) is connected to an air guide pipe (13), and the air guide pipe (13) is used to supply air to the air bag (12) so that the air bag (12) expands and pushes the oil scraper plate (11) upward.

2. The oil wellhead anti-pollution device according to claim 1, characterized in that: The recovery chamber (4) is an annular chamber, a plurality of the collecting ports (5) are arranged at intervals along the circumference of the cannula (1), and the drainage structure comprises drainage pieces provided at each collecting port (5).

3. The oil wellhead anti-pollution device according to claim 2, characterized in that: The drainage member is a wheel (6) rotatably mounted in the collection port (5), the rotation axis of the wheel (6) being perpendicular to the axis of the insertion tube (1), and the wheel (6) being in contact with the outer wall of the oil pipe (21) when in use, so as to drive the wheel (6) to rotate when the oil pipe (21) is lifted upward; a plurality of oil collecting grooves (8) arranged circumferentially around the wheel (6) are provided on the outer peripheral surface of the wheel (6), each oil collecting groove (8) being used to receive the oil dirt scraped off by the annular oil scraping member and pour the oil dirt in the oil collecting groove (8) into the recovery chamber (4) when the wheel (6) rotates.

4. The oil wellhead anti-pollution device according to claim 3, characterized in that: A guide plate (9) is provided on the inner wall of the recovery chamber (4), and the guide plate (9) abuts against the outer peripheral surface of the runner (6) to scrape off the oil stains on the outside of the runner (6) and drop them into the recovery chamber (4) to prevent the oil stains from being brought out again.

5. The oil wellhead anti-pollution device according to any one of claims 1 to 4, characterized in that: The annular oil scraper is a scraper cylinder (2), which is a cylinder whose inner diameter gradually decreases from bottom to top, and the top end of the scraper cylinder (2) is used to scrape away oil stains on the outside of the oil pipe (21).

6. The oil wellhead anti-pollution device according to any one of claims 1 to 4, characterized in that: The support seat (15) comprises a fixed seat body (16) fixedly arranged outside the insertion tube (1), and a movable seat body (17) movably inserted into the fixed seat body (16) along the circumference of the insertion tube (1), the fixed seat body (16) and the movable seat body (17) both being semi-annular structures, the movable seat body (17) being able to be accommodated in the fixed seat body (16), and also being able to slide out of the fixed seat body (16) and cooperate with the fixed seat body (16) to form an annular support seat (15); the support seat (15) further comprises a fixing structure for fixing the fixed seat body (16) and the movable seat body (17) together after the movable seat body (17) slides out to a limit position.

7. The oil wellhead anti-pollution device according to any one of claims 1 to 4, characterized in that: A cone foot (20) is provided at the bottom of the support seat (15), and the cone foot (20) is used to be inserted into the ground at the wellhead of the oil well.

8. The oil wellhead anti-pollution device according to any one of claims 1 to 4, characterized in that: An anti-collision washer (14) is fixedly provided on the inner wall of the upper end of the insertion tube (1).

Images