Oil well mouth residual liquid sealing and recycling device

Abstract

The invention provides an oil well mouth residual liquid sealing and recycling device. The oil well mouth residual liquid sealing and recycling device comprises a first half box body and a second half box body which can be assembled or disassembled mutually. After the first half box body and the second half box body are assembled, an oil pipe cavity used for containing the positions of upper and lower oil pipe couplings is defined between the first half box body and the second half box body. The cavity openings at the upper and lower ends of the oil pipe cavity are hooped with the oil pipe; a water outlet is formed in the bottom of at least one half box body. The oil pipe is wrapped by an oil pipe cavity formed by assembling and enclosing the two half box bodies, and is provided with a sealing piece, so that the upper and lower oil pipe couplings can be sealed in the box bodies; the upper oil pipe and the lower oil pipe are opened in the sealed box body to achieve separation, and upper liquid falls down after separation and is discharged through a water outlet. Splashing caused by fast falling of liquid in the upper oil pipe can be effectively avoided, and therefore the situation of large-area pollution is prevented.

Description

Technical Field

[0001] The invention belongs to the field of oil extraction, relates to a technology for recovering and controlling sewage and wastewater in oil pipes during downhole operations of oil wells, and specifically is a sealing and recovery device for residual liquid at an oil wellhead. Background Art

[0002] During downhole operations in oil wells, the wellbore pump, tubing, and other downhole pipes must be pulled out. However, due to variations in the wellbore structure, well fluid properties, and formation stress structure, the oil drain valve on the pump is often difficult to open smoothly. This results in splashing of the tubing on the surface during extraction, further causing oil and water splashing on the downhole operation site. This is particularly true during the tubing extraction process, where, after the surface tubing couplings are removed and the tubing is lifted, the oil and water on the top of the tubing can instantly pour down, rapidly and containing large amounts of oil, chemicals, and other harmful substances.

[0003] Currently, the only way to address this problem is to lay large areas of anti-fouling tarpaulins around the construction site to minimize the scope of contamination caused by oil spills. Oil, water, and other pollutants leaking from the pipelines collect on the tarpaulins. Once a certain amount is reached, they are collected by dedicated personnel and vehicles. However, this method is not only time-consuming and labor-intensive, but also increases operational costs. Especially in adverse weather conditions and strong winds, the effectiveness of the tarpaulins is greatly reduced, making it difficult to achieve the desired pollution prevention results. Summary of the Invention

[0004] In order to avoid splashing of dirty oil and wastewater from the upper part of the oil pipe after removing the ground oil pipe coupling and lifting the oil pipe, the present invention provides an oil wellhead residual liquid sealing and recovery device, which can avoid large-scale pollution caused by splashing due to the rapid drop of liquid in the upper oil pipe, and prevent crude oil from falling to the ground during oil well operation.

[0005] The technical solution adopted by the present invention to solve its technical problems is:

[0006] A sealing and recovery device for residual liquid at the wellhead of an oil well comprises a first half-box and a second half-box which can be assembled or disassembled with each other; after assembly, the first half-box and the second half-box enclose an oil pipe cavity for accommodating upper and lower oil pipe couplings; the upper and lower ends of the oil pipe cavity are clamped with the oil pipe, and a seal is provided at the clamping location; a drain outlet is provided at the bottom of at least one half-box.

[0007] Based on this solution, the oil pipe is enclosed by a lumen formed by the assembly of two half-boxes. Seals are provided to seal the upper and lower pipe couplings within the box. The upper and lower pipes are separated within the sealed box, allowing the upper fluid to fall and drain out through the drain. This effectively prevents splashing caused by the rapid fall of fluid from the upper pipe, thereby preventing widespread contamination. The device, consisting of a first and second half-box that can be assembled or disassembled, is easy to install and disassemble during oil well operations and convenient to use.

[0008] Furthermore, an arc-shaped groove is provided on the top cover and the base of the first half box body and the second half box body, and each groove is connected to an arc-shaped baffle extending vertically inward, and two arc-shaped sealing ring baffles spaced apart up and down are connected to the side wall of the baffle, and an arc-shaped sealing ring is installed between the two sealing ring baffles on each baffle; the four sealing rings enclose and form an oil pipe cavity.

[0009] Based on the above solution, an arc-shaped sealing ring is installed between the two sealing ring baffles on each baffle, that is, the installation structure of the seal is set as an upper and lower stacked structure. While ensuring sealing, the internal liquid flow will not overflow or splash due to the falling impact.

[0010] Furthermore, the grooves are formed on the side of the half-box top cover or the base, and an eccentric structure is adopted to facilitate the collection of liquid, thereby avoiding the situation in which liquid overflows due to direct impact from the middle package.

[0011] Furthermore, the upper and lower sealing ring ends of the first half of the box each have a hollow section. After the first and second half of the box are assembled, the upper and lower sealing ring ends of the second half of the box are inserted into their corresponding hollow sections. The two sealing rings are interleaved and sealed, allowing the sealing rings of the two half of the box to fit tightly together, enhancing the overall sealing performance; it also makes it easier to align and plug the first and second half of the box during assembly.

[0012] Furthermore, at least one half-box has sealing strips fixedly connected to both sides and the bottom. The sealing strips fit tightly against the sides and the bottom of the box. When the two half-boxes are assembled together, the sealing strips can effectively fill and seal any small gaps that may exist, thereby preventing liquid from seeping through the gaps.

[0013] Furthermore, at least one half-box is internally provided with a guide plate for buffering the impact of falling liquid, which can buffer the pressure of the impact of rapid falling liquid.

[0014] Furthermore, one end of the guide vane is connected to the upper portion of one side of the inner wall of the half-box, and the other end is connected to the lower portion of the other side of the inner wall of the half-box, with a smooth and gradual transition from one end of the guide vane to the other. The streamlined structure of the guide vane has a smooth and gradual transition, which can gradually recover the internal fluid in layers, reducing impact while slowing the outflow rate of the liquid.

[0015] Furthermore, at least one of the half-boxes is connected to a vent at the top to balance the internal air pressure during the falling process of the liquid, thereby ensuring that no splashing due to increased pressure occurs in the package cavity.

[0016] Furthermore, a number of copper conical baffles are movably connected to the upper edges of the bottom baffles of both the first and second half housings. These baffles can be folded downward or lifted upward relative to the baffles. When liquid contacts the baffles, they fold downward, preventing the liquid from directly impacting the bottom sealing ring baffle and seal.

[0017] Furthermore, a rotating shaft is fixedly mounted on the outer wall of the first half of the box, and a buckle plate is rotatably connected to the rotating shaft. The buckle plate rotates around the rotating shaft to buckle the second half of the box or rotate away from the second half of the box. The buckle plate can flexibly rotate around the rotating shaft, thereby conveniently buckling or rotating away from the second half of the box.

[0018] In summary, the beneficial effects of the present invention include:

[0019] This device can effectively prevent splashing caused by the rapid fall of liquid in the upper oil pipe, thereby preventing large-scale pollution and ensuring that crude oil does not fall to the ground during oil well operations. It adopts a double-half-box assembly structure to wrap the upper oil pipe and the lower oil pipe coupling to ensure overall sealing performance; the upper and lower parts have a laminated sealing structure to ensure that while sealing, the impact of the internal liquid flow will not cause liquid overflow or splashing; the use of guide vanes can buffer the pressure of the rapid fall of the liquid; the streamlined structure of the guide vanes has a smooth and gradual transition, which can gradually recover the internal fluid in layers, reducing the impact while easing the flow rate of the liquid outflow; the device adopts an eccentric structure to facilitate the collection of liquid and avoid liquid overflow due to direct impact caused by the middle package. It has an exhaust port to balance the internal air pressure during the liquid's fall, ensuring that the pressure in the package cavity does not increase and cause splashing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an appearance diagram of the overall device structure of the present invention;

[0021] Figure 2 This is a half-side internal view of the device of the present invention;

[0022] Figure 3 This is a schematic diagram of the sealing ring assembly installation of the present invention.

[0023] In the figure: 1. Exhaust port; 2. First half of the box; 3. Sealing ring baffle; 4. Vertical sealing strip; 5. Upper sealing ring; 6. Fixing screw; 7. Rotating shaft; 8. Guide vane; 9. Lower sealing strip; 10. Drain port; 11. Second half of the box; 12. Lower sealing ring; 13. Hollow section; 14. Mounting frame; 15. Oil pipe cavity; 16. Conical baffle; 17. Baffle; 18. Fastening plate. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely to distinguish components and should not be construed as indicating or implying relative importance.

[0026] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] Example 1

[0028] An oil wellhead residual liquid sealing and recovery device comprises a first half box body 2 and a second half box body 11 of a semi-cylindrical structure, both of which are made of steel and have substantially the same overall structure. Figure 1 A mounting bracket 14 is welded to the outer wall of the first half of the housing 2. A rotating shaft 7 is fixedly mounted within the mounting bracket 14. A snap plate 18 is rotatably connected to the rotating shaft 7. When the first half of the housing 2 and the second half of the housing 11 are aligned and assembled, the snap plate 18 rotates around the rotating shaft 7 to snap onto the outer wall of the second half of the housing 11. The rotating shaft 7 and mounting bracket 14 are both made of steel.

[0029] Preferably, vertical sealing strips 4 are riveted to both sides of the first half of the box 2 via fixing screws 6, and a lower sealing strip 9 is riveted to the bottom edge of the first half of the box 2 via fixing screws 6. When the two half-boxes are assembled together, the sealing strips can effectively fill and close any small gaps that may exist, thereby preventing liquid from seeping through the gaps. The fixing screws 6, vertical sealing strips 4, and lower sealing strip 9 are all made of steel.

[0030] Take the first half box 2 as an example to illustrate the structure of the half box, see Figure 2The top cover and the side of the base of the first half box 2 are both provided with an arc-shaped groove, each groove is connected to an arc-shaped baffle 17 extending vertically inward, and two arc-shaped sealing ring baffles 3 are welded horizontally and spaced apart from each other on the side wall of the baffle 17. An arc-shaped sealing ring is installed between the two sealing ring baffles 3 on each baffle 17, that is, Figure 2 The upper sealing ring 5 and lower sealing ring 12 are shown; the upper sealing ring 5 and lower sealing ring 12 of the first half housing 2 and the second half housing 11 enclose an oil pipe cavity 15 that matches the shape of the oil pipe and is used to accommodate the upper and lower oil pipe couplings. Preferably, the ends of the upper sealing ring 5 and lower sealing ring 12 of the first half housing 2 each have a hollow section 13. After the first half housing 2 and the second half housing 11 are assembled, the ends of the upper sealing ring 5 and lower sealing ring 12 of the second half housing 11 are inserted into the corresponding hollow sections 13 of the upper sealing ring 5 and lower sealing ring 12 of the first half housing 2. An exhaust port 1 is welded to the top of the first half housing 2 to balance the internal air pressure of the housing, and a drain port 10 is welded to the bottom of the second half housing 11. Both the drain port 10 and the exhaust port 1 are made of steel. The sealing ring baffle 3, the upper sealing ring 5, and the lower sealing ring 12 are all made of rubber.

[0031] A guide plate 8 is riveted to the inner wall of the first half box body 2. One end of the guide plate 8 is connected to the upper part of one side of the inner wall of the first half box body 2, and the other end is connected to the lower part of the other side of the inner wall of the first half box body 2. The guide plate 8 transitions smoothly and gradually from one end to the other end.

[0032] A plurality of copper conical baffles 16 are movably connected to the upper edges of the bottom baffles 17 of the first half box body 2 and the second half box body 11 . The conical baffles 16 can be folded downward or lifted upward relative to the baffles 17 .

[0033] After the oil well tubing is pulled out, the tubing pins and threads are loosened, the first and second housing halves 2 and 11 are opened, and the tubing is placed into the tubing cavity 15. The first and second housing halves 2 and 11 are then aligned and sealed with the snap plate 18. The tubing is then lifted, and the upper and lower tubing open within the tubing cavity 15, separating them. After separation, the upper liquid falls. The conical baffle 16 connected to the bottom baffle 17 folds downward upon contact with the falling liquid, preventing the liquid from directly impacting the bottom sealing ring. Liquid leaking from the upper tubing falls rapidly within the housing. The impact of the impact causes it to reverse upward, and after being buffered by the bottom guide vane 8, it turns downward. Liquid not buffered by the guide vane 8 enters the space above the guide vane 8, falls along the inclined flow path of the guide vane 8, and finally accumulates at the bottom of the housing, where it is discharged through the drain port 10.

[0034] The upper and lower oil pipes are opened in the sealed box to achieve separation. After separation, the upper liquid falls and is discharged from the drain port. The entire process is completed in a sealed space provided by the box body. The liquid is discharged and recovered uniformly through the drain port, which can effectively avoid splashing caused by the rapid fall of liquid in the upper oil pipe, thereby preventing large-scale pollution.

[0035] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An oil wellhead residual liquid sealing and recovery device, characterized in that: The invention comprises a first half-box (2) and a second half-box (11) which can be assembled or disassembled with each other; after the first half-box (2) and the second half-box (11) are assembled, an oil pipe cavity (15) is formed between the two to accommodate the positions of upper and lower oil pipe couplings; the upper and lower ends of the oil pipe cavity (15) are clamped with the oil pipe, and a sealing member is provided at the clamping position; and a drainage port (10) is provided at the bottom of at least one half-box.

2. The oil wellhead residual liquid sealing and recovery device according to claim 1, characterized in that: The top cover and the base of the first half box (2) and the second half box (11) are both provided with an arc-shaped groove, each groove is connected to an arc-shaped baffle (17) extending vertically inward, the side wall of the baffle (17) is connected to two arc-shaped sealing ring baffles (3) spaced apart in an upper and lower direction, and an arc-shaped sealing ring is installed between the two sealing ring baffles (3) on each baffle (17); the four sealing rings enclose and form an oil pipe cavity (15).

3. The oil wellhead residual liquid sealing and recovery device according to claim 2, characterized in that: The grooves are arranged on the side of the half box top cover or the base.

4. The oil wellhead residual liquid sealing and recovery device according to claim 3, characterized in that: The upper and lower sealing ring ends of the first half box (2) both have hollow sections (13); after the first half box (2) and the second half box (11) are assembled, the upper and lower sealing ring ends of the second half box (11) are inserted into their corresponding hollow sections (13).

5. The oil wellhead residual liquid sealing and recovery device according to any one of claims 1 to 4, characterized in that: Both side edges and the bottom edge of at least one half box are fixedly connected with sealing strips.

6. The oil wellhead residual liquid sealing and recovery device according to claim 5, characterized in that: A guide plate (8) for buffering the impact of falling liquid is installed inside at least one half box.

7. The oil wellhead residual liquid sealing and recovery device according to claim 6, characterized in that: One end of the guide plate (8) is connected to the upper portion of one side of the inner wall of the half box, and the other end is connected to the lower portion of the other side of the inner wall of the half box. The guide plate (8) transitions smoothly and gradually from one end to the other end.

8. The oil wellhead residual liquid sealing and recovery device according to claim 6, characterized in that: The top of at least one half box is connected to an exhaust port (1) to balance the air pressure inside the box.

9. The oil wellhead residual liquid sealing and recovery device according to claim 8, characterized in that: The upper edges of the bottom baffles (17) of the first half box body (2) and the second half box body (11) are movably connected with a plurality of copper conical baffles (16), and the conical baffles (16) can be folded downward or lifted upward relative to the baffles (17).

10. The oil wellhead residual liquid sealing and recovery device according to claim 1, characterized in that: A rotating shaft (7) is fixedly mounted on the outer wall of the first half box body (2), and a buckle plate (18) is rotatably connected to the rotating shaft (7). The buckle plate (18) rotates around the rotating shaft (7) to buckle the second half box body (11) or rotate away from the second half box body (11).

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