A residual fluid collection device for oilfield workover

Abstract

The utility model relates to oilfield workover operation technical field, concretely is a kind of oilfield workover liquid collection equipment, comprising: connecting piece, with pipeline entrance;Solid-liquid separation component, rotation is connected in the connecting piece;Two housings, detachably connected to the outer circumferential surface of the connecting piece, two the cavity formed by the relative enclosure of housing, the solid-liquid separation component is located in the cavity, and part of the connecting piece is also located in the cavity;Driving part, set in one of the housing, the driving part with the solid-liquid separation component detachably connected, drain pipe, set in the bottom of two housings.The oilfield workover liquid collection equipment can efficiently collect the workover liquid that drops on the outer wall of oil pipe, rely on driving part to drive solid-liquid separation component to rotate, realize liquid impurity interception screening, prevent pipeline blockage from source, reduce artificial cleaning frequency and subsequent processing cost.

Description

Technical Field

[0001] This utility model relates to the field of oilfield well workover operation technology, specifically to a residual fluid collection device for oilfield well workover. Background Technology

[0002] Oilfield well workover refers to the downhole maintenance process where, during the production process of an oil well, due to reasons such as pump failure, tubing corrosion and leakage, wax and scale buildup on the well wall, formation sand blockage, or damage to downhole tools, normal oil production cannot be achieved. This involves using workover equipment to retrieve the downhole tubing, sucker rod, and pump from the wellhead for inspection, replacement, and performing operations such as well washing, sand flushing, wax removal, and leak plugging to restore normal oil production. During the operation, the workover rig lifts the tubing and sucker rod one by one to the surface. At this time, crude oil and formation water adhering to the outer wall of the tubing will continuously drip down. When disassembling the tubing couplings, the oil-water mixture accumulated inside the pipe will also pour downwards. Therefore, residual fluid collection equipment is needed to form a receiving area below the wellhead to collect the dripping and pouring waste fluid in a sealed manner, preventing oil pollution from spreading to the well site and surrounding environment.

[0003] During actual operation, the existing equipment contains residual liquid mixed with solid impurities such as mud, wax blocks, and oil sludge in the well. This can easily cause blockages in the external receiving and collection ports, diversion pipelines, and flow channels. The equipment blockage problem occurs frequently, which not only requires frequent shutdowns for manual cleaning, seriously delaying the progress of on-site operations, but also results in high impurity content and serious contamination of the collected residual liquid, which greatly increases the load and treatment cost of the downstream waste liquid treatment process. Overall, the continuity of operation is poor and the operating efficiency is low. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In order to overcome the above-mentioned defects of the prior art, this utility model provides a residual fluid collection device for oilfield well workover, which solves the problems mentioned in the background art, such as the easy blockage of collection ports and guide channels by impurities such as mud, wax blocks, and oil sludge in the residual fluid during operation, which requires frequent shutdowns for cleaning and affects the continuity of operation. The high impurity content of the collected residual fluid leads to a large load, high cost and low overall operation efficiency of subsequent waste fluid treatment.

[0006] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a residual fluid collection device for oilfield well workover, comprising: Connector with pipe inlet; A solid-liquid separation assembly is rotatably connected to the connecting member; Two housings are detachably connected to the outer peripheral surface of the connector. The two housings are arranged opposite each other to form a cavity. The solid-liquid separation assembly is located in the cavity, and a part of the connector is also located in the cavity. A driving component is disposed on one of the housings, and the driving component is detachably connected to the solid-liquid separation assembly for driving the solid-liquid separation assembly to rotate; A drain pipe is located at the bottom of the two housings and communicates with the cavity to drain the liquid inside the cavity.

[0007] Preferably, a tapered component is fixedly connected to the upper end of the connector, and an opening is provided through the interior of the tapered component, and the opening is coaxially corresponding to the pipe inlet; The upper end of the connector is rotatably connected to a sealing disc, and an annular plate is fixedly connected to the inner circumferential wall of the sealing disc. The conical member is located inside the sealing disc, and the annular plate is in contact with the bottom end of the conical member. The upper end of the sealing disc is fixedly connected to one end of the solid-liquid separation component.

[0008] Preferably, the solid-liquid separation assembly includes a filter barrel, the lower end of which is fixedly connected to the upper end of the sealing disc, and the upper end of the conical member is located inside the filter barrel. The inner wall of the filter barrel is provided with a spiral blade, one end of which is in contact with the outer circumferential surface of the conical member, and the other end of which is detachably connected to a baffle. The upper end of the filter barrel is detachably connected to the drive member.

[0009] Preferably, the driving component includes an end cap, the lower end of which is detachably connected to the upper end of the filter barrel. The outer peripheral surface of the end cap is provided with main teeth, and the outer surface of the main teeth is engaged with driving teeth. The upper end of the driving teeth is keyed to a driving motor, and one side of the driving motor is detachably connected to the upper end of one of the housings.

[0010] Preferably, the upper end of the end cap is provided with multiple liquid inlets, and a positioning tube is provided in the middle of the upper end of the end cap. Two clamping members are symmetrically arranged on the inner wall of the positioning tube. Each clamping member includes a spring and a clamping shell. One end of the spring is fixedly connected to the positioning tube, and one side of the clamping shell is fixedly connected to the other end of the spring.

[0011] Preferably, one of the housings has an operating port on its outer surface, and a sealing door is detachably connected to the outer surface of the operating port. Each housing has an arc-shaped groove at its upper end, and two arc-shaped grooves are arranged opposite each other to form an outlet.

[0012] Preferably, the other end of the drain pipe is detachably connected to a water pump, and the output end of the water pump is connected to a collection box via a hose.

[0013] (III) Beneficial Effects This utility model provides a residual fluid collection device for well workover in oilfields, which has the following beneficial effects: This oilfield well workover residual fluid collection equipment, through the coordinated design of connectors and solid-liquid separation components, can efficiently collect residual fluid dripping from the outer wall and inside of the tubing during tubing pull-in operations. Simultaneously, a drive unit rotates the solid-liquid separation component, intercepting, screening, and separating the residual fluid flowing into it. This efficiently filters out solid impurities such as mud, wax blocks, and oil sludge, achieving impurity retention and wastewater separation. This prevents pipeline blockage at the source, reduces subsequent processing pressure, minimizes frequent equipment shutdowns and manual cleaning, ensures continuous and stable on-site operations, and also reduces downstream waste. The liquid treatment process is designed to reduce the load and processing cost. The two sets of shells together form a sealed cavity, providing a closed protective space for the solid-liquid separation components, preventing residual liquid splashing and oil leakage, and ensuring operational safety. At the same time, it supports the drive components, drain pipes and other auxiliary structures. The overall rigidity is strong, which can isolate external debris interference. The detachable structure facilitates the cleaning of internal impurities and equipment maintenance. In addition, the drain pipe connects to the bottom of the sealed cavity, serving as a centralized discharge channel for the separated waste liquid. It guides and transports the residual liquid after solid-liquid separation in a unified manner, completing the directional discharge of waste liquid and ensuring stable liquid level and smooth flow inside the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the exploded structure of this utility model; Figure 3 This is a schematic diagram of the drive component structure of this utility model; Figure 4 This is a schematic diagram of the solid-liquid separation component of this utility model; Figure 5 This is a schematic diagram of the connector structure of this utility model; Figure 6 This utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0015] In the diagram: 1. Connector; 2. Solid-liquid separation assembly; 201. Filter barrel; 202. Spiral blade; 203. Baffle; 3. Housing; 4. Drive unit; 401. End cap; 402. Main gear; 403. Drive gear; 404. Drive motor; 405. Liquid inlet; 406. Positioning tube; 407. Clamping component; 4071. Spring; 4072. Clamping shell; 5. Drain pipe; 6. Conical component; 7. Opening; 8. Sealing disc; 9. Annular plate; 10. Operating port; 11. Sealing door; 12. Outlet; 13. Water pump; 14. Collection box. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0017] Example 1: Please refer to Figures 1 to 6 This utility model provides a technical solution: a residual fluid collection device for oilfield well workover, comprising: The connector 1 has a pipe inlet; a tapered component 6 is fixedly connected to the upper end of the connector 1. An opening 7 is opened through the tapered component 6, and the opening 7 is coaxially aligned with the pipe inlet. The tapered component 6 adopts a tapered flow guiding structure, and its internal opening 7 is coaxially aligned with the pipe inlet of the connector 1. This effectively gathers and guides the incoming well workover fluid, guiding it to flow evenly to the filtration area of ​​the solid-liquid separation component 2. It also works with the connector 1 to achieve a dual positioning function. The connector 1 can be stably placed at the wellhead position in the oilfield. Its built-in pipe inlet can accurately limit and straighten the tubing and sucker rod pulled out from the oilfield well. This ensures that the tubing and sucker rod are smoothly inserted into the pipeline inlet, and then pass through the opening 7 of the conical part 6 to smoothly enter the solid-liquid separation component 2. This ensures that the residual liquid collection and solid-liquid separation processes are connected in an orderly manner. The pipeline inlet size of the connector 1 is compatible with the specifications of the external oil wellhead and has the same diameter. It can be directly adapted to the wellhead for installation and positioning. The overall fit is strong, which facilitates the rapid erection and fixation of the equipment and ensures that the tubing and sucker rod are smoothly inserted into the operation. At the same time, the residual workover fluid attached to the outer wall of the tubing, sucker rod and other pipelines can drip down along the outer wall of the pipeline and flow back into the oil well through the pipeline inlet, avoiding the random spillage of waste liquid and optimizing the on-site working environment. A sealing disc 8 is rotatably connected to the upper end of the connector 1. An annular plate 9 is fixedly connected to the inner circumferential wall of the sealing disc 8. A conical piece 6 is located inside the sealing disc 8, and the annular plate 9 is in contact with the bottom end of the conical piece 6. The upper end of the sealing disc 8 is fixedly connected to one end of the solid-liquid separation component 2. The upper end of the sealing disc 8 is fixedly connected to the filter bucket 201, and the lower end is rotatably assembled with the connector 1, so that it can rotate synchronously with the solid-liquid separation component 2. In actual use, conventional rotating parts such as bearings can be installed on the upper end of the connector 1 so that the sealing disc 8 can rotate synchronously with the solid-liquid separation component 2. The annular plate 9 can adopt a flexible sealing and bonding structure to tightly fit the bottom end face of the conical piece 6, enhance the sealing performance of the rotating position, prevent small impurities from overflowing from the gaps, reduce rotational friction loss, and improve the stability of equipment operation.

[0018] Please see Figures 1 to 4The solid-liquid separation component 2 is rotatably connected to the connector 1. The solid-liquid separation component 2 includes a filter barrel 201. The lower end of the filter barrel 201 is fixedly connected to the upper end of the sealing plate 8, and the upper end of the conical part 6 is located inside the filter barrel 201. The inner wall of the filter barrel 201 is provided with a spiral blade 202. One end of the spiral blade 202 is in contact with the outer peripheral surface of the conical part 6. The other end of the spiral blade 202 is detachably connected to a baffle 203. The upper end of the filter barrel 201 is detachably connected to the drive component 4. The filter barrel 201 has evenly distributed filter pores on its wall, allowing it to receive the introduced well workover fluid. The evenly distributed filter pores effectively intercept solid impurities such as mud, wax, and oil sludge, forming an independent, sealed solid-liquid separation chamber. The upper end of the conical component 6 extends into the interior of the filter barrel 201, and the sealing disc 8 is fixed to the bottom of the filter barrel 201 to achieve a bottom seal, ensuring that the residual fluid flowing into the filter barrel 201 can be stably retained and separated. The spiral blades 202 rotate synchronously with the filter barrel 201. On the one hand, the internal residual liquid is continuously stirred and disturbed to prevent sludge and wax blocks from condensing and clumping, thus preventing filter pore blockage. On the other hand, the residual liquid around the conical part 6 is guided and pushed to the inner wall of the filter tank 201 by the spiral pushing action, which accelerates the liquid permeation and separation. At the same time, when the spiral blades 202 scrape the mud and solid impurities deposited at the bottom to the inner wall of the tank, the baffles 203 set at the end can effectively block and limit the intercepted impurities, preventing solid impurities from being mixed into the liquid phase again or leaking out from the inside of the tank, further ensuring the solid-liquid separation effect.

[0019] Please see Figures 1 to 3 Two housings 3 are detachably connected to the outer periphery of the connector 1. The two housings 3 are arranged opposite each other to form a cavity. The solid-liquid separation component 2 is located in the cavity, and a part of the connector 1 is also located in the cavity. An operation port 10 is opened on the outer surface of one of the housings 3. A sealing door 11 is detachably connected to the outer surface of the operation port 10. An arc-shaped groove is opened at the upper end of each housing 3. The two arc-shaped grooves are arranged opposite each other to form an outlet 12. The operation port 10 on the outside of the housing 3 is a reserved maintenance window, facing the area above the internal drive component 4, which facilitates the operator to inspect the drive structure later. Inspection, maintenance, and troubleshooting are among the other operations performed. The sealing door 11 is a matching sealing component for the operating port 10. When the equipment is in normal operation, it closes and seals the operating port 10, which can effectively prevent residual liquid leakage, odor diffusion, and external debris from entering the cavity, ensuring a clean and sealed operating environment for the equipment. It can be quickly disassembled and opened during inspection and maintenance, making operation simple and greatly improving maintenance efficiency. The arc-shaped grooves at the upper ends of the two housings 3 enclose and form the outlet 12, which can provide an exit channel for oil pipes, sucker rods, and other pipelines entering the equipment, ensuring smooth and unobstructed pipeline operations and adapting to the needs of continuous pipe pulling and lowering operations on site. A drive unit 4 is installed on one of the housings 3 and is detachably connected to the solid-liquid separation component 2 to drive the solid-liquid separation component 2 to rotate. A drain pipe 5 is installed at the bottom of both housings 3 and is connected to the cavity to drain the liquid in the cavity. The other end of the drain pipe 5 is detachably connected to a water pump 13. The output end of the water pump 13 is connected to a collection box 14 through a hose. The water pump 13 is connected to the drain pipe 5 to provide power for transporting the clean residual liquid after separation, accelerate the discharge of liquid inside the cavity, avoid liquid accumulation, and improve the overall collection efficiency. The collection box 14 is the final storage container for the residual liquid. It receives the filtered well repair residual liquid transported through the hose, collects it in a unified manner, facilitates subsequent unified transportation and centralized harmless treatment, and is suitable for standardized operations in the oilfield.

[0020] Example 2: Please refer to Figures 2 to 6 This utility model provides a technical solution based on Embodiment 1. The driving component 4 includes an end cap 401. The lower end of the end cap 401 is detachably connected to the upper end of the filter barrel 201. The outer peripheral surface of the end cap 401 is provided with a main tooth 402. The outer surface of the main tooth 402 is engaged with a driving tooth 403. The upper end of the driving tooth 403 is keyed to a driving motor 404. One side of the driving motor 404 is detachably connected to the upper end of one of the housings 3. The end cap 401 closes the upper end of the filter barrel 201, integrating the transmission and liquid inlet structure. The main tooth 402 is fixedly provided on the outer peripheral surface of the end cap 401, and it meshes with the driving tooth 403 for transmission. The driving tooth 403 is coaxially connected to the output end of the driving motor 404, stably bearing the output torque of the driving motor 404. Through gear meshing transmission, the main tooth 402 is driven to rotate synchronously, thereby smoothly and efficiently transmitting the power of the driving motor 404 to the filter barrel 201, driving the filter barrel 201 to rotate at a uniform speed, providing stable power support for the internal solid-liquid separation operation. The upper end of the end cap 401 is provided with multiple liquid inlets 405. The middle part of the upper end of the end cap 401 is provided with a positioning tube 406. Two clamping parts 407 are symmetrically arranged on the inner wall of the positioning tube 406. Each clamping part 407 includes a spring 4071 and a clamping shell 4072. One end of the spring 4071 is fixedly connected to the inside of the positioning tube 406, and one side of the clamping shell 4072 is fixedly connected to the other end of the spring 4071. In the above technical solution, the positioning tube 406 set in the middle of the upper end of the end cap 401 is mainly used to accurately limit and straighten the tubing, sucker rod and other pipelines that penetrate the equipment, ensuring that the pipelines remain coaxial during the pipe lifting operation and avoiding deviation and shaking. During the pipe lifting operation, the clamping member 407 inside the positioning tube 406 can firmly clamp and fix the tubing and sucker rod. After the operator completes the disassembly and separation of the currently connected pipeline through the operating port 10, the clamping member 407 can stably limit and fix the pipelines that are not disassembled, effectively preventing the pipelines from slipping back into the well due to their own weight, ensuring the safety and continuity of the operation. At the same time, the residual well workover fluid inside the disassembled pipeline will drip down naturally, and the multiple inlets opened at the upper end of the end cap 401 The liquid outlet 405 can collect the dripping residual liquid and guide it smoothly into the solid-liquid separation component 2 for filtration and separation, avoiding residual liquid from scattering and polluting the site, and further improving the residual liquid collection efficiency of the equipment. The spring 4071 inside the clamping component 407 can continuously output elastic extrusion force to provide a stable pushing force for the clamping shell 4072. When the oil pipe, sucker rod and other pipelines are inserted between the two sets of clamping shells 4072, the clamping shell 4072 is tightly attached to the outer wall of the pipeline by the elastic pressing action of the spring 4071, thereby forming a flexible ring clamping of the pipeline and achieving stable limiting and fixing. Through the compression characteristics of the spring 4071, the clamping component 407 can adapt to a certain pipe diameter deviation, and the clamping is reliable and will not damage the pipe surface. In addition, it should be noted that the positioning tube 406 is located at the middle of the upper end of the end cover 401. The positioning tube 406 can be connected to the end cover 401 through existing rotating components such as bearings. When the solid-liquid separation assembly 2 rotates synchronously with the drive structure, the rotation isolation effect of the bearing can keep the positioning tube 406 and the oil pipe and sucker rod inside it stationary, preventing the pipeline from rotating with the filter structure. When the operator disassembles and separates the pipeline, the solid-liquid separation assembly 2 should be in the closed state.

[0021] All electrical components mentioned in this article are connected to an external controller and mains power via standard interfaces. The controller can be any commercially available known device. There are no special restrictions on the specific models of the electrical components; any commercially available ordinary products can be selected, as long as they meet the usage requirements of this utility model.

[0022] In this invention, the working steps of the device are as follows: First, the entire equipment is placed above the oilfield wellhead, with connector 1 positioned at the wellhead. The pipe inlet of connector 1 is precisely aligned with the wellhead, completing the overall installation of the equipment. This allows tubing, sucker rods, and other pipes to vertically pass through the equipment. During pipe pulling operations, the tubing or sucker rod inside the well is pulled upwards, passing sequentially through the pipe inlet of connector 1, the opening 7 of the conical component 6, and into the filter tank 201. Finally, it exits through the outlet 12 formed by the arc-shaped grooves at the upper ends of the two housings 3. The positioning pipe... The internal clamping component 407, relying on the spring 4071 to push the clamping shell 4072, elastically clamps and fixes the inserted tubing and sucker rod to prevent the pipeline from slipping. Workers open the outer sealing door 11 of the shell 3 and reach into the equipment through the operating port 10 to disassemble the upper section of the tubing string to be separated. After the upper section of the pipeline is separated, it is suspended inside the shell 3, while the clamping component 407 continuously locks the lower section of the remaining pipeline, preventing the entire tubing string from falling back into the well. The inner wall of the separated pipeline is flush with the pipe... The residual workover fluid in the cavity falls freely and flows into the filter tank 201 through the inlet 405 on the surface of the end cap 401. The conical parts 6 collect the remaining fluid. After the separation is completed, the operator closes the sealing door 11 and then starts the drive motor 404. The drive motor 404 drives the drive gear 403 to rotate. The drive gear 403 meshes with the main gear 402, driving the end cap 401 and the filter tank 201 to rotate synchronously, so that the solid-liquid separation assembly 2 operates continuously. The filter tank 201 drives the spiral blades 20 2. The synchronous rotation stirs and agitates the remaining liquid in the tank. At the same time, the spiral blades 202 push the remaining liquid around the cone-shaped part 6 and the bottom deposited impurities toward the inner wall of the filter tank 201. The baffle 203 blocks and limits the solid impurities to prevent secondary diffusion. The remaining liquid after filtration and separation enters the sealed cavity formed by the two shells 3 through the pores of the filter tank 201. The water pump 13 is turned on, and the remaining liquid in the cavity is discharged through the bottom drain pipe 5 and then transported to the collection box 14 for unified collection and storage through the hose.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A residual fluid collection device for oilfield well workover, characterized in that, include: Connector (1) has a pipe inlet; The solid-liquid separation component (2) is rotatably connected to the connector (1); Two housings (3) are detachably connected to the outer periphery of the connector (1). The two housings (3) are arranged to form a cavity. The solid-liquid separation component (2) is located in the cavity, and a part of the connector (1) is also located in the cavity. A drive unit (4) is disposed on one of the housings (3), and the drive unit (4) is detachably connected to the solid-liquid separation assembly (2) for driving the solid-liquid separation assembly (2) to rotate; A drain pipe (5) is provided at the bottom of the two housings (3) and is connected to the cavity for draining the liquid in the cavity.

2. The residual fluid collection device for oilfield well workover as described in claim 1, characterized in that: The upper end of the connector (1) is fixedly connected to a tapered part (6), and an opening (7) is provided through the inside of the tapered part (6), and the opening (7) is coaxially corresponding to the pipe inlet; The upper end of the connector (1) is rotatably connected to a sealing disc (8), and an annular piece (9) is fixedly connected to the inner circumferential wall of the sealing disc (8). The conical piece (6) is located inside the sealing disc (8), and the annular piece (9) is in contact with the bottom end of the conical piece (6). The upper end of the sealing disc (8) is fixedly connected to one end of the solid-liquid separation assembly (2).

3. The residual fluid collection device for oilfield well workover as described in claim 2, characterized in that: The solid-liquid separation assembly (2) includes a filter barrel (201), the lower end of which is fixedly connected to the upper end of the sealing disc (8), and the upper end of the conical member (6) is located inside the filter barrel (201). The inner wall of the filter barrel (201) is provided with a spiral blade (202), one end of which is in contact with the outer circumferential surface of the conical member (6), and the other end of which is detachably connected to a baffle (203). The upper end of the filter barrel (201) is detachably connected to the drive member (4).

4. The residual fluid collection device for oilfield well workover as described in claim 3, characterized in that: The drive unit (4) includes an end cap (401), the lower end of which is detachably connected to the upper end of the filter barrel (201). The outer peripheral surface of the end cap (401) is provided with a main tooth (402), and a drive tooth (403) is engaged on the outer surface of the main tooth (402). The upper end of the drive tooth (403) is keyed to a drive motor (404), and one side of the drive motor (404) is detachably connected to the upper end of one of the housings (3).

5. The residual fluid collection device for oilfield well workover as described in claim 4, characterized in that: The upper end of the end cap (401) is provided with multiple liquid inlets (405). A positioning tube (406) is provided in the middle of the upper end of the end cap (401). Two clamping members (407) are symmetrically arranged on the inner wall of the positioning tube (406). Each clamping member (407) includes a spring (4071) and a clamping shell (4072). One end of the spring (4071) is fixedly connected to the positioning tube (406), and one side of the clamping shell (4072) is fixedly connected to the other end of the spring (4071).

6. The residual fluid collection device for oilfield well workover as described in claim 1, characterized in that: An operation port (10) is provided on the outer surface of one of the housings (3). A sealing door (11) is detachably connected to the outer surface of the operation port (10). An arc-shaped groove is provided at the upper end of each housing (3). Two arc-shaped grooves are arranged to form an outlet (12).

7. The residual fluid collection device for oilfield well workover as described in claim 1, characterized in that: The other end of the drain pipe (5) is detachably connected to a water pump (13), and the output end of the water pump (13) is connected to a collection box (14) via a hose.

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