A downhole oil pipe cleaning machine

Abstract

The invention discloses a downhole oil pipe cleaning machine, which relates to the technical field of oil well operation, including a reel, a conveying assembly, a cleaning assembly, a flaw detector, a well fluid recovery assembly, a safety device and a distribution box; the cleaning assembly includes a tensile pipe, a hot water pipe, a hot water pump, an oil pipe inner wall cleaner, an oil pipe outer wall cleaner, a special counterweight pipe and a special-shaped oil scooper, the tensile pipe is wound on the reel in an orderly manner and can be extended into the oil pipe of the oil well; the well fluid recovery assembly includes a drainage bucket, a temporary liquid storage bucket, a suction pipe, a recovery pump and a discharge pipe, the suction pipe connects the drainage bucket, the temporary liquid storage bucket and the inlet of the recovery pump in sequence, and the outlet of the recovery pump is connected to an underground oil collection pipe network or an oil storage tank through a discharge pipe; the reel, the hot water pump and the recovery pump are all connected to the distribution box. The downhole oil pipe cleaning machine of the invention can complete the cleaning tasks of the inner and outer walls of the oil pipe underground, achieve the environmental protection effect of closed cleaning of the oil pipe, save cleaning costs, and reduce the labor intensity of workers.

Description

Technical Field

[0001] The invention relates to the technical field of oil well operation, in particular to a downhole oil pipe cleaning machine. Background Art

[0002] During the oil pipe operation, cleaning the oil rods and oil pipes is an important link. In order to achieve closed cleaning and environmental protection operation, our company has successfully developed environmental protection cleaning equipment for oil well operation. At present, in several oil fields, the technology of cleaning the outer wall of oil rods and oil pipes has gradually matured and been promoted. In practice, it is found that in oil wells without oil drainers or oil drainers that cannot be opened, the pipes are always full of well fluid. The only way to collect water is to use a clamp bucket. During the process of pulling out the oil pipes, water is flushed from top to bottom one by one, the inner wall is cleaned one by one, and water is collected one by one with a clamp bucket. Not only does it extend the operation time, but it also more or less affects the environmental protection effect. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a downhole oil pipe cleaning machine. During the oil well operation, before the downhole oil pipe is raised from the wellhead, the inner wall of the oil pipe is cleaned underground and the well fluid is raised from the wellhead, thereby improving the environmental protection effect of closed cleaning, saving cleaning costs and reducing the labor intensity of workers.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a downhole oil pipe cleaning machine, comprising a reel, a conveying assembly, a cleaning assembly, a flaw detector, a well fluid recovery assembly, a safety device and a distribution box;

[0006] The cleaning assembly includes a tensile tube, a hot water pipe, a hot water pump, an oil pipe inner wall cleaner, an oil pipe outer wall cleaner, a special counterweight pipe and a special-shaped oil scooper. The tensile tube is wound on the winding machine in an orderly manner. One end of the tensile tube is connected to the hot water pump through the hot water pipe. The other end of the tensile tube extends into the oil well tubing through the conveying assembly. The lower end of the tensile tube is sequentially installed with the special counterweight pipe, the special-shaped oil scooper and the oil pipe inner wall cleaner.

[0007] The safety device includes a tensile pipe blowout preventer;

[0008] The well fluid recovery assembly includes a drainage barrel, a temporary liquid storage barrel, a suction pipe, a recovery pump and a discharge pipe. The tensile pipe blowout preventer, the oil pipe outer wall cleaner, the flaw detector and the drainage barrel are sequentially installed on the wellhead blowout preventer from bottom to top. The suction pipe connects the drainage barrel, the temporary liquid storage barrel and the inlet of the recovery pump in sequence. The outlet of the recovery pump is connected to the underground oil gathering pipe network or the oil storage tank through the discharge pipe.

[0009] The winder, the hot water pump and the recovery pump are all connected to the distribution box.

[0010] Preferably, the conveying assembly includes a ground pulley and a top pulley, the ground pulley is installed on the Christmas tree, and the top pulley is hoisted above the wellhead. After the tensile tube is extended from the winder, it passes through the ground pulley and the top pulley in sequence and extends into the oil well tubing.

[0011] Preferably, the liquid suction pipe includes a front section pipe and a rear section pipe, the two ends of the front section pipe are respectively connected to the liquid discharge bucket and the temporary liquid storage bucket, and the two ends of the rear section pipe are respectively connected to the temporary liquid storage bucket and the inlet of the recovery pump.

[0012] Preferably, it also includes an operating room and a car bracket, the safety device also includes a brake and a meter, and the winder includes a bracket, a motor, a reducer, a central shaft, a roller, a gear, a chain and a pipe arranger;

[0013] The motor is connected to the reducer, the reducer is connected to the drum through the gear, the drum is fixedly sleeved on the central shaft, the tensile tube is wound on the drum, the central shaft is rotatably mounted on the bracket, the central shaft is connected to the pipe arranger through the chain, and the pipe arranger and the meter are arranged on the bracket;

[0014] The meter counter is in contact with the roller, the brake is installed on the roller, the motor and the meter counter are connected to the distribution box, and the distribution box is arranged on the bracket; the bracket is installed in the operating room, and the operating room is arranged on the vehicle bracket.

[0015] Preferably, the safety device further comprises an alarm, the alarm is installed in the operating room, a positioning signal device is provided on the tensile tube, the alarm is connected to the positioning signal device, and the alarm is connected to the distribution box.

[0016] Preferably, an air compressor is installed in the operating room, and the air compressor is connected to the distribution box.

[0017] Preferably, an electric heater is installed in the operating room, and the electric heater is connected to the distribution box.

[0018] Preferably, a lighting lamp is installed in the operating room, and the lighting lamp is connected to the distribution box.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] The downhole oil pipe cleaning machine provided by the present invention comprises a winding machine, a conveying component, a cleaning component, a flaw detector, a well fluid recovery component, a safety device and a distribution box. After the oil rod is pulled out and before the oil well oil pipe is pulled out, hot water is injected into the downhole oil well oil pipe through a tensile pipe, and the hot water cleans the inner wall of the downhole oil well oil pipe through the oil pipe inner wall cleaner, and at the same time, the oil-water mixed liquid produced by the cleaning is taken out of the wellhead and then injected into the underground oil gathering pipe network or oil storage tank; by cleaning the inner wall of the oil well oil pipe, the temperature of the outer wall of the oil well oil pipe has risen, and the oil stains on the outer wall have been basically melted. Generally, when the oil pipe is pulled out, the purpose of cleaning the outer wall can be achieved by scraping it off with the oil pipe sealer. The device in the present invention can complete the cleaning of the inner and outer walls of the oil well oil pipe at the same time, save cleaning costs, reduce the labor intensity of workers, and save time and effort. During the process of pulling out the oil well tubing, when the oil well tubing passes through the center of the flaw detector, the flaw detector will automatically complete the flaw detection of the damage of the oil well tubing, thereby displaying the damage degree of the oil well tubing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a downhole oil pipe cleaning machine provided by the present invention;

[0023] Figure 2 It is a structural schematic diagram of the winder in the present invention.

[0024] Explanation of reference numerals: 1. hot water pump; 2. motor; 3. reducer; 4. bracket; 5. operating room; 6. distribution box; 7. meter; 8. brake; 9. central axis; 10. roller; 11. chain; 12. pipe arrangement device; 13. lighting lamp; 14. alarm; 15. air compressor; 16. electric heater; 17. recovery pump; 18. ground pulley; 19. temporary liquid storage barrel; 20. liquid suction pipe; 21. underground oil collection pipe network; 22. Drain pipe; 23. Wheel; 24. Car bracket; 25. Hot water pipe; 26. Horizon; 27. Sky pulley; 28. Tensile pipe; 29. ​​Drain bucket; 30. Flaw detector; 31. Oil pipe outer wall cleaner; 32. Tensile pipe blowout preventer; 33. Wellhead blowout preventer; 34. Casing valve; 35. Oil well casing; 36. Oil well tubing; 37. Special counterweight pipe; 38. Special-shaped oil scooper; 39. Oil pipe inner wall cleaner. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a downhole oil pipe cleaning machine, which can clean the inner wall of the downhole oil pipe and raise the well fluid out of the wellhead before the downhole oil pipe is raised from the wellhead during oil well operation, thereby improving the environmental protection effect of closed cleaning, saving cleaning costs and reducing the labor intensity of workers.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 As shown, the present embodiment provides a downhole tubing cleaning machine, including a winding machine, a conveying assembly, a cleaning assembly, a flaw detector 30, a well fluid recovery assembly, a safety device and a distribution box 6; the cleaning assembly includes a tensile tube 28, a hot water pipe 25, a hot water pump 1, an inner wall cleaner 39 of the tubing, an outer wall cleaner 31 of the tubing, a special counterweight pipe 37 and a special-shaped oil scooper 38, the tensile tube 28 is wound on the winding machine in an orderly manner, one end of the tensile tube 28 is connected to the hot water pump 1 through the hot water pipe 25, the other end of the tensile tube 28 is extended into the oil well tubing 36 through the conveying assembly, and the lower end of the tensile tube 28 is sequentially installed with a special counterweight pipe 37, a special-shaped oil scooper 38, and a plurality of special-shaped oil scoopers 39. 8 and an oil pipe inner wall cleaner 39; the safety device includes a tensile pipe blowout preventer 32; the well fluid recovery assembly includes a drainage barrel 29, a temporary liquid storage barrel 19, a suction pipe 20, a recovery pump 17 and a discharge pipe 22, the tensile pipe blowout preventer 32, the oil pipe outer wall cleaner 31, the flaw detector 30 and the drainage barrel 29 are installed on the wellhead blowout preventer 33 from bottom to top, the suction pipe 20 connects the drainage barrel 29, the temporary liquid storage barrel 19 and the inlet of the recovery pump 17 together in sequence, and the outlet of the recovery pump 17 is connected to the underground oil gathering pipe network 21 or the oil storage tank through the discharge pipe 22; the winder, the hot water pump 1 and the recovery pump 17 are all connected to the distribution box 6.

[0029] A wellhead blowout preventer 33 is installed at the top of the existing oil well casing 35 . An oil pipe sealer is arranged inside the wellhead blowout preventer 33 . A casing valve 34 is arranged at the upper part of the oil well casing 35 .

[0030] Specifically, the oil pipe inner wall cleaner 39 is a nozzle, and the oil pipe outer wall cleaner 31 is provided with a plurality of nozzles. The oil pipe outer wall cleaner 31 is connected to a water pump through a water pipe, and the water pump is connected to a hot water source.

[0031] The method for cleaning the downhole oil pipe is as follows: after the oil rod is pulled out and before the oil well oil pipe 36 is pulled out, the oil pipe inner wall cleaner 39 is sent into the set position of the oil well oil pipe 36 in the well using the tensile pipe 28. Hot water is sprayed on the inner wall of the oil well oil pipe 36 through the tensile pipe 28 and the oil pipe inner wall cleaner 39 to clean the inner wall of the oil well oil pipe 36 in the well. The tensile pipe 28 raises the well fluid to the wellhead during the rising process, and the well fluid is injected into the underground oil collection pipe network 21 or enters the ground oil storage tank through the recovery pump 17; when cleaning the inner wall of the oil well oil pipe 36, the outer wall temperature of the oil well oil pipe 36 has risen, and the oil stains have basically melted. In the case of general wax deposition, when the oil well oil pipe 36 is pulled out, the outer wall can be cleaned by scraping it with the oil pipe sealer, and there is no need to open the oil pipe outer wall cleaner 31 for cleaning. It can be seen that the downhole tubing cleaning machine in this embodiment can clean the inner wall and the outer wall of the oil well tubing 36 at the same time, which can not only save cleaning costs, but also reduce the labor intensity of workers, saving time and effort. During the process of pulling out the oil well tubing 36 from the downhole, when the oil well tubing 36 passes through the center of the flaw detector 30, the flaw detector 30 will automatically perform flaw detection on the damage of the oil well tubing 36, thereby displaying the damage degree of the oil well tubing 36.

[0032] This embodiment also includes a special pipe plug for the oil pipe. If an oil well with a high liquid level is encountered, the special pipe plug for the oil pipe can be used to temporarily seal a set part of the oil pipe to create conditions for lifting the well fluid and ensure smooth completion of cleaning the inner wall of the oil pipe.

[0033] The conveying assembly includes a ground pulley 18 and a top pulley 27. The ground pulley 18 is installed on the Christmas tree, and the top pulley 27 is hoisted above the wellhead. The tensile tube 28 is extended from the winder and passes through the ground pulley 18 and the top pulley 27 in sequence and extends into the oil well pipe 36.

[0034] like Figure 2 As shown, the safety device also includes a brake 8 and a meter 7, and the winder includes a bracket 4, a motor 2, a reducer 3, a central shaft 9, a roller 10, a gear, a chain 11 and a pipe arranger 12; the motor 2 is connected to the reducer 3 through a coupling, and the reducer 3 is connected to the roller 10 through a gear. Specifically, a gear is provided on the roller 10, and the gear of the reducer 3 is meshed with the gear of the roller 10. The roller 10 is fixedly sleeved on the central shaft 9, the tensile tube 28 is wound on the roller 10, and the central shaft 9 is rotatably mounted on the bracket 4. On the upper part, the central axis 9 is connected to the pipe arranger 12 through the chain 11, and the pipe arranger 12 and the meter counter 7 are arranged on the bracket 4; the meter counter 7 is in contact with the roller 10, and the brake 8 is installed on the roller 10. The motor 2 and the meter counter 7 are connected to the distribution box 6, and the distribution box 6 is arranged on the bracket 4; the present embodiment also includes an operation room 5 and a car bracket 24, the bracket 4 is installed in the operation room 5, the operation room 5 is arranged on the car bracket 24, and the bottom of the car bracket 24 is equipped with a wheel 23, and the wheel 23 is located on the horizon 26.

[0035] The tensile tube 28 is lowered from the drum 10, passes through the pipe rammer 12, the ground pulley 18 and the top pulley 27 in sequence, and then goes vertically downward, passes through the drain bucket 29, the flaw detector 30, the oil pipe outer wall cleaner 31, the tensile tube blowout preventer and the wellhead blowout preventer 33, and enters the set position of the oil well tubing 36. The hot water required for cleaning is transported by the hot water pump 1 through the hot water pipe 25 and the tensile tube 28 to the oil pipe inner wall cleaner 39, and automatically sprays and washes the inner wall of the oil well tubing 36. The motor 2 is started, and the motor 2 drives the drum 10 to rotate through the reducer 3, so that the tensile tube 28 wound on the drum 10 pulls the oil pipe inner wall cleaner 39 up or down, and cleans the inner wall of the oil well tubing 36. The winding machine is started again to drive the tensile tube 28 and the special-shaped oil scoop 38 to rise rapidly, and the well fluid in the oil well pipe 36 is lifted to the drainage bucket 29, and automatically flows into the temporary liquid storage bucket 19, and the recovery pump 17 is started to generate suction, and the well fluid is sucked into the recovery pump 17, and then pressed into the underground oil collection pipe network 21 through the drainage pipe 22, completing the closed cleaning task.

[0036] The safety device also includes an alarm 14 , which is connected to a positioning signal device via an electric wire. The positioning signal device is installed at a set position of the tensile tube 28 . The alarm 14 is connected to a distribution box 6 , and the alarm 14 is installed in an operating room 5 .

[0037] The brake 8, meter counter 7 and alarm 14 play a role in ensuring safety in this embodiment. When the drum 10 is running, the meter counter 7 starts to run at the same time. It displays the length of the tensile tube 28 inserted or lifted. When the tensile tube 28 is about to be lifted out of the wellhead, the positioning signal device on the tensile tube 28 will automatically start the alarm 14, thereby reminding the operator to slow down and prevent accidents such as pushing up and falling down, thereby ensuring safety; if the alarm 14 fails, the operator should immediately start the brake 8 to control the drum 10 to slow down and prevent accidents such as pushing up and falling down.

[0038] The present embodiment also includes an air compressor 15, which is installed in the operating room 5 and connected to the distribution box 6. The main function of the air compressor 15 is to purge the tensile tube 28. Especially in winter, every time you finish work, you must start the air compressor 15 to purge the remaining liquid in the tensile tube 28 to prevent ice blockage.

[0039] In order to prevent the tensile tube 28 from freezing in winter, an electric heater 16 is also provided in this embodiment. The electric heater 16 is installed in the operating room 5 and is connected to the distribution box 6 .

[0040] In order to ensure nighttime construction, an illuminating lamp 13 is further configured in this embodiment. The illuminating lamp 13 is installed in the operating room 5 and is connected to the distribution box 6 .

[0041] In this embodiment, the distribution box 6 is equipped with various electrical components, which respectively control the hot water pump 1, the recovery pump 17, the motor 2, the meter 7, the alarm 14, the air compressor 15, the electric heater 16 and the lighting lamp 13.

[0042] The tensile tube 28 in this embodiment is a special pipeline, which has a certain tensile strength, thereby ensuring that it will not be deformed or damaged during use. At the same time, it also has the characteristics of high and low temperature resistance, acid and alkali resistance, and can withstand corresponding working pressure.

[0043] When cleaning the inner wall of the oil well tubing 36, you may encounter a variety of different well conditions, and different cleaning methods are adopted according to the well conditions:

[0044] The first method is to open the oil well of the oil drain, put the tensile tube 28 together with the oil pipe inner wall cleaner 39 into the underground oil well oil pipe 36, and the hot water enters the tensile tube 28 and automatically sprays to the inner wall of the oil well oil pipe 36 through the oil pipe inner wall cleaner 39 to clean the inner wall of the oil well oil pipe 36.

[0045] The second type is a thin oil well without an oil drain or an oil drain that cannot be opened and a thick oil well with a high water content. The inner wall cleaner 39 and the special-shaped oil scooper 38 should be placed in the oil well tubing 36 to replace the well fluid while piercing and washing. Then the tensile tube 28 and the special-shaped oil scooper 38 are lifted to bring the well fluid in the tube out of the wellhead to complete the inner wall cleaning task of the oil well tubing 36.

[0046] The third type is to encounter thick oil wells and high viscosity wells. Since the water content in the well fluid is relatively low, the first step is to dilute the thick oil. The method is: use the tensile tube 28 to send hot water to the set position, use the hot water to dilute the thick oil, and displace it out of the wellhead. When the well fluid is thinner, use the oil pipe inner wall cleaner 39 to clean it up and down, and finally lift the well fluid out of the wellhead to complete the cleaning task.

[0047] The fourth type is that, if an oil well with a high static liquid level is encountered (the liquid level of some oil wells is close to the ground level), when the oil well tubing 36 is pulled out, the well fluid in the oil well casing 35 will automatically enter the oil well tubing 36. In this case, a special pipe plug for the oil well can be used to temporarily block the location where the downhole oil well tubing 36 is set, and then the well fluid is replaced, lifted and cleaned to complete the tubing cleaning task.

[0048] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A downhole oil pipe cleaning machine, characterized in that: It includes a winder, a conveying assembly, a cleaning assembly, a flaw detector, a well fluid recovery assembly, a safety device and a distribution box; The cleaning assembly includes a tensile tube, a hot water pipe, a hot water pump, an oil pipe inner wall cleaner, an oil pipe outer wall cleaner, a special counterweight pipe and a special-shaped oil scoop. The tensile tube is wound on the reel in an orderly manner. One end of the tensile tube is connected to the hot water pump through the hot water pipe. The other end of the tensile tube extends into the oil well tubing through the conveying assembly. The lower end of the tensile tube is sequentially installed with the special counterweight pipe, the special-shaped oil scoop and the oil pipe inner wall cleaner; the conveying assembly includes a ground pulley and a sky pulley. The ground pulley is installed on the Christmas tree, and the sky pulley is hoisted above the wellhead. After the tensile tube is extended from the reel, it passes through the ground pulley and the sky pulley in sequence and extends into the oil well tubing; The safety device includes a tensile pipe blowout preventer; The well fluid recovery assembly includes a drainage barrel, a temporary liquid storage barrel, a suction pipe, a recovery pump and a discharge pipe. The tensile pipe blowout preventer, the oil pipe outer wall cleaner, the flaw detector and the drainage barrel are sequentially installed on the wellhead blowout preventer from bottom to top. The suction pipe connects the drainage barrel, the temporary liquid storage barrel and the inlet of the recovery pump in sequence. The outlet of the recovery pump is connected to the underground oil gathering pipe network or the oil storage tank through the discharge pipe. The winder, the hot water pump and the recovery pump are all connected to the distribution box; It also includes an operating room and a car bracket, the safety device also includes a brake and a meter, and the winder includes a bracket, a motor, a reducer, a central shaft, a roller, a gear, a chain and a pipe arranger; The motor is connected to the reducer, the reducer is connected to the drum through the gear, the drum is fixedly sleeved on the central shaft, the tensile tube is wound on the drum, the central shaft is rotatably mounted on the bracket, the central shaft is connected to the pipe arranger through the chain, and the pipe arranger and the meter are arranged on the bracket; The meter counter is in contact with the roller, the brake is installed on the roller, the motor and the meter counter are connected to the distribution box, and the distribution box is arranged on the bracket; the bracket is installed in the operating room, and the operating room is arranged on the vehicle bracket.

2. The downhole oil pipe cleaning machine according to claim 1, characterized in that: The liquid suction pipe includes a front section pipe and a rear section pipe, the two ends of the front section pipe are respectively connected to the liquid discharge bucket and the temporary liquid storage bucket, and the two ends of the rear section pipe are respectively connected to the temporary liquid storage bucket and the inlet of the recovery pump.

3. The downhole oil pipe cleaning machine according to claim 1, characterized in that: The safety device also includes an alarm, which is installed in the operating room. A positioning signal device is provided on the tensile tube, and the alarm is connected to the positioning signal device, and the alarm is connected to the distribution box.

4. The downhole oil pipe cleaning machine according to claim 1, characterized in that: An air compressor is installed in the operating room, and the air compressor is connected to the distribution box.

5. The downhole oil pipe cleaning machine according to claim 1, characterized in that: An electric heater is installed in the operating room and is connected to the distribution box.

6. The downhole oil pipe cleaning machine according to claim 1, characterized in that: A lighting lamp is installed in the operating room, and the lighting lamp is connected to the distribution box.

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