Automatic cleaning equipment for oil rod and oil pipe

Abstract

The invention discloses automatic cleaning equipment for a sucker rod and a sucker pipe, and relates to the field of online cleaning of petroleum. Comprising a steam and hot water dual-function boiler, a hot water flow adjusting device and an automatic water supplementing device. The invention relates to a steam-water mixed type oil rod cleaner and a steam-water mixed type oil pipe cleaner. The vacuum water replenishing tank can be used for automatically separating steam from water; and the water level automatic control device is arranged. The dual-function boiler can generate hot water and steam at the same time, and an oil rod and an oil pipe are cleaned in the mode that steam carries water. Dirty oil and sewage generated by cleaning are automatically introduced into the vacuum sewage tank, and are discharged into a ground water tank by a sewage pump when the water level in the water tank reaches a certain height, so that the cleaning operation of the oil rod and the oil pipe is completed.

Description

Technical Field

[0001] The invention relates to the field of oil well online cleaning technology in the petroleum industry, and in particular to an automatic cleaning device for oil rods and oil pipes. Background Art

[0002] During the oil production process, due to various reasons such as scaling, wax deposition, sand return, and wear of oil pipes and oil rods, oil well operations need to be carried out to repair the oil wells. During the oil well operation process, removing the dirt on the inner and outer walls of the oil rods and oil pipes is an important part of oil well repair.

[0003] At present, most oil fields subcontract the cleaning tasks to various professional cleaning teams. There are two types of cleaning equipment used by each cleaning team.

[0004] The first type is hot water cleaning equipment: the equipment only produces hot water, which is used to clean the oil rods and oil pipes.

[0005] The second type is steam cleaning equipment: the equipment only generates steam, and uses steam to clean the oil rods and oil pipes.

[0006] Practice has proved that (i) when using hot water to clean oil rods and oil pipes, the advantage is that hot water can increase the cleaning pressure of hot water through a pressure pump. The disadvantage is that the temperature of hot water is low, and it is difficult to clean thick oil wells and waxed wells. When using hot water for cleaning, a dedicated person is required to observe the rise and fall of the oil rod or oil pipe at all times, and open or close the foot valve in time with the foot. A slight negligence will affect the cleaning quality and fail to meet the environmental protection requirements of cleaning.

[0007] (II) When using steam to clean oil rods and oil pipes, the advantages are: high temperature, but low flushing power. After the thick oil and wax melt, they stick to the outer wall of the oil rod and oil pipe, which is not easy to clean. When using steam to clean oil rods and oil pipes, the operator must always observe the rise and fall of the oil rod and oil pipe, and open or close the steam valve manually in time. A slight negligence will affect the cleaning quality and fail to meet the environmental protection requirements of cleaning.

[0008] (III) During the oily wastewater recovery process, operators need to analyze the water level in the wastewater tank based on experience and suck and discharge wastewater in a timely manner. Any negligence will result in the wastewater not being recovered in time and the oily wastewater being sucked into the vacuum pump, causing equipment damage and contaminating the well washing site. Summary of the invention

[0009] The purpose of the present invention is to provide an automatic oil rod and oil pipe cleaning device, which is used for automatically cleaning the oil rod and oil pipe during the operation of the oil well.

[0010] Thereby, the problems existing in the prior art are solved, the cleaning efficiency is improved, the production cost is reduced, and the environmental protection requirements are met.

[0011] To achieve the above object, the present invention provides the following technical solutions.

[0012] An automatic cleaning device for oil rods and oil pipes, including an automatic boiler water replenishment, automatic heating and temperature control system; an oil rod and oil pipe cleaning system; and an automatic oil and sewage recovery and discharge system.

[0013] The automatic water replenishment, automatic heating and temperature control system includes components such as a water replenishment pump, a boiler, a burner, and a pressure pump.

[0014] The water supply pump is connected to the boiler by a water pipe. It automatically supplies water to the boiler. When the water level in the boiler drops to a low water level, the water supply pump automatically starts to supply water to the boiler. When the water level in the boiler reaches a high water level, the water supply pump automatically stops supplying water.

[0015] The boiler is preferably an improved steam and hot water dual-function boiler. A hot water outlet is added at an appropriate position of the steam boiler, and a hot water valve is installed to control the hot water output. In this way, the single-function steam boiler becomes a dual-function boiler that can produce both steam and hot water. A water level alarm is used to automatically control the start or stop of the water supply pump to ensure the normal water level of the boiler in a timely manner.

[0016] The burner (either oil or gas) is installed on the boiler. After being ignited, it automatically heats the boiler. When the pressure inside the furnace reaches the maximum pressure, the burner stops working. When the pressure inside the furnace drops to the minimum set value, the burner automatically turns on and ignites for heating.

[0017] The pressure pump is specially used for pressurizing hot water, converting low-pressure hot water into high-pressure hot water for use by the downhole oil pipe cleaning machine when cleaning the oil pipe downhole.

[0018] Preferably, the oil rod and oil pipe automatic cleaning system comprises: a steam electric control valve, a hot water regulating valve, a steam-with-water oil rod cleaner, a steam-with-water oil pipe cleaner and a micro oil pipe inner wall cleaner.

[0019] Preferably, the steam valve is connected to the boiler outlet with a steam pipeline. The hot water valve is connected to the boiler hot water outlet with a hot water pipeline. The hot water regulating valve is installed between the steam pipe and the hot water pipe to adjust the hot water supply to achieve an appropriate ratio. Thus, the hot water is driven by steam.

[0020] Preferably, when cleaning the oil rod, the oil rod cleaner is installed on the top of the oil pipe to be cleaned, and the inlet of the oil rod cleaner is connected to the boiler steam electric valve by a steam pipe; When cleaning the outer wall of the oil pipe, install the outer wall cleaner of the oil pipe on the wellhead blowout preventer, and connect the inlet of the outer wall cleaner to the steam electric valve; When cleaning the inner wall on the well, connect the inner wall cleaning nipple to the steam pipe and the boiler steam electric valve.

[0021] The oily wastewater recovery and discharge system comprises a vacuum wastewater tank, a water level gauge, a water level probe, a steam-water separation baffle, a vacuum pump and connecting pipelines.

[0022] Preferably, the vacuum sewage tank is made of steel plate and can be made into a cylindrical or other shape, can withstand a negative pressure of 0.1Mpa, and has the characteristics of high temperature resistance and collision resistance. Its volume is more suitable between 1-3m³. The vacuum sewage tank is provided with a dirty oil and sewage suction port, an exhaust port on the top, and a sewage valve on the bottom. A vertical baffle is provided in the vacuum sewage tank, and the function of the baffle is to separate the gas and water, thereby preventing the sewage from being sucked into the vacuum pump.

[0023] Preferably, the water tank water level gauge is installed at a suitable position on the upper side of the sewage tank, with a cleaning port at the upper end of the water level gauge and a sewage outlet (sewage valve) at the lower end.

[0024] The water level meter probe is installed above the sewage tank, and its tank detection depth is set according to actual needs.

[0025] The present invention achieves the following technical effects on existing cleaning technologies.

[0026] The advantages of hot water single-function boiler and steam single-function boiler are combined into one, and their strengths are used to overcome their weaknesses, and they are improved into steam and hot water dual-function boilers.

[0027] We have developed a professional cleaning machine for cleaning oil rods and oil pipes with a steam-hot water mixture. It can use a mixture of steam and water for cleaning, making full use of the high temperature of steam and the impact of hot water, improving the cleaning quality and saving water.

[0028] The steam electric valve is controlled by buttons to achieve automatic cleaning and ensure the cleaning quality of the oil rod and oil pipe.

[0029] It realizes the automatic recovery of contaminated oil and wastewater, and reminds the operator to discharge the contaminated oil and wastewater into the ground tank or press it into the underground oil collection pipeline network in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 1 , schematic diagram of the boiler’s water supply, heating, temperature control and pressurization systems.

[0032] Figure 2 , schematic diagram of oil rod cleaning without preheating.

[0033] Figure 3 , schematic diagram of oil rod preheating and cleaning.

[0034] Figure 4 , schematic diagram of cleaning the outer wall of the oil pipe.

[0035] Figure 5 , schematic diagram of cleaning the inner wall of the oil pipe in the well.

[0036] Figure 6 , schematic diagram of cleaning the oil pipe underground.

[0037] In the figure: 1. Boiler; 2. Water level gauge; 3. Water level alarm; 4. Boiler water inlet; 5. Make-up water pump; 6. Water inlet valve; 7. Boiler burner; 8. Boiler chimney; 9. Steam pipe; 10. Hot water valve; 11. Hot water outlet pipe; 12. Hot water regulating valve; 13. Hot water connecting valve; 14. Booster pump; 15. Booster pump outlet; 16. Steam automatic valve; 17. Oil rod; 18. Oil rod cleaner; 19. Wellhead blowout preventer; 20. Oil pipe; 21. Oil Well casing; 22. Steam transmission pipe; 23. Drain pipe; 24. Casing valve; 25. Gas-water separation baffle; 26. Vacuum pump; 27. Vacuum sewage tank; 28. Sewage pump; 29. ​​Screen pipe; 30. Oil pipe outer wall cleaner; 31. Flushing nipple; 32. Oil well support; 33. Fixed fulcrum; 34. Special-shaped water collection box; 35. Winding machine; 36. Anti-tensile hot water pipe; 37. Guide wheel; 38. Sewage tank; 39. Oil pipe inner wall cleaner; 40. Water level probe. DETAILED DESCRIPTION

[0038] Embodiment 1: This embodiment provides a steam and hot water dual-function boiler. Figure 1 As shown, a hot water valve 10 is installed at an appropriate height on the side of the steam boiler 8, and a water outlet pipe 11 is connected downward from the valve 10. A connecting valve 13 is installed at the lower end of the water outlet pipe 11, and the connecting valve 13 is connected to the booster pump 14. A steam electric valve 16 is installed at the lower end of the steam pipe 9. The regulating valve 12 is installed between the hot water pipe 11 and the steam pipe 9; During the steam-water cleaning process, the electric steam valve 16 is fully opened. The hot water valve 10 is fully opened. Hot water is sucked into the steam pipe. According to the requirements, the regulating valve 12 is adjusted to adjust the appropriate amount of hot water. The adjusted hot water is brought to the oil rod cleaner 18 or the oil pipe outer wall cleaner 30 by the steam pipe for cleaning.

[0039] Regarding automatic water replenishment, the boiler used in this equipment has been installed with an automatic water level alarm 3 before leaving the factory, which will send a signal to the water replenishment pump 6. When the water level drops to the set height, the water replenishment pump 6 will automatically start and start replenishing water. When the water level in the furnace reaches the highest set height, the water replenishment pump 6 will automatically stop.

[0040] In order to control the steam temperature, a temperature signal line is installed on the steam pipe to transmit the temperature signal to the burner 8. The burner 8 will automatically start and stop according to the temperature signal of the boiler. When the temperature is lower than the set value, it will automatically ignite and heat up. When the temperature is higher than the set value, it will automatically extinguish and standby.

[0041] Embodiment 2: There are two methods for fully automatic cleaning of oil rods The first method is to use steam-carrying water to directly clean the sucker rod (see Figure 2 ) Preferably, a special rod cleaning device 18 (hereinafter referred to as rod cleaning device) is made and installed on the oil pipe 20 of the well to be cleaned. The inlet of the rod cleaning device 18 is connected to the boiler steam valve 16 through the steam pipe 22; during the lifting process of the rod 17, the steam electric valve 16 is opened by a remote control, and the steam with hot water enters the rod cleaning device 18 through the steam pipe 22 and sprays to the rod 17, so that the rod 17 is cleaned during the lifting process; The cleaned oily sewage is automatically sucked into the vacuum sewage tank 27. Under the action of the air-water separation baffle, the oily sewage falls into the vacuum tank. The air is discharged into the atmosphere by the vacuum pump 26. When the water level in the vacuum sewage tank 27 reaches the designed height, the water level probe 40 will transmit a full water signal to the vacuum pump 26, and the vacuum pump 26 will automatically shut down. This prompts the operator to pump the oily sewage in the vacuum sewage tank 27 into the ground tank or press it into the underground oil pipeline network.

[0042] Embodiment three: The second method, preferably: preheating and cleaning the sucker rod (see Figure 3 ) When encountering oil wells with heavy oil and a lot of wax, the rod preheating method should be adopted to ensure the cleaning quality. The method is: make a screen tube 29 with an oil pipe. Before cleaning the oil rod, first take out the first oil pipe 17 at the top of the oil well, install the screen tube 29 between the oil pipe 17 and the second oil pipe, and install the oil rod cleaner on the oil pipe 20 to be washed. The inlet of the oil rod cleaner 18 is connected to the boiler steam valve 16 through the steam pipe 22. During the lifting process of the oil rod 17, the electric steam valve 10 is opened by the remote control, and the steam carries hot water into the oil rod cleaner 18 and sprays to the oil rod 17. During the lifting process of the oil rod 17, the oil rod 17 is cleaned. The washed oily sewage flows downward, passes through the screen tube 29, flows into the annulus of the casing 21, and returns upward to the casing valve 24. Under the action of the vacuum pump 26, it is sucked into the vacuum sewage tank 27. When the water level of the vacuum sewage tank 27 reaches the designed height, the water level probe 40 will transmit a full water signal to the vacuum pump 26, and the vacuum pump 26 will stop automatically. Start the sewage pump 28 to pump the oily sewage in the vacuum sewage tank 27 into the ground water tank or press it into the underground oil collection pipe network.

[0043] Embodiment 4, automatic cleaning of the outer wall of the oil pipe (see Figure 4) Preferably, a special oil pipe outer wall cleaner 30 for steam and water is made. Before cleaning the oil pipe, the oil pipe outer wall cleaner 30 is first installed on the oil well blowout preventer 19, and the air inlet of the outer wall cleaner 30 is connected to the steam valve 16. The electric steam valve 16 is opened by a remote control, and the steam carrying hot water will enter the oil pipe outer wall cleaner 30 through the steam delivery pipe 22, and the outer wall of the oil pipe will be cleaned during the lifting process of the oil pipe 20. The washed dirty oil and sewage are sucked into the vacuum sewage tank 27, and the air and water are automatically separated by the steam-water separation baffle 25. The air is discharged by the vacuum pump 26, and the water level probe 40 will transmit the water full signal to the vacuum pump 26, and the vacuum pump 26 stops absorbing water, and then the sewage pump 27 is started to pump the dirty oil and sewage into the ground sewage tank or press it into the underground oil collection pipe network.

[0044] Example 5: Cleaning the inner wall of the oil pipe on the well (see Figure 5 ) Preferably, an inner flushing short pipe 31 is made and installed on the top of the oil pipe. The inner flushing short pipe 31 is connected to the steam valve 16 through the steam pipe 22. After the oil pipe is lifted to a certain height, the first oil pipe 20 is unscrewed and slightly pushed to the top of the special-shaped recovery barrel 29. At the same time, the electric steam valve 16 is opened by remote control. The steam passes through the steam pipe 22 and the flushing short pipe 31 and enters the oil pipe 20 downward to flush the inner wall of the oil pipe 20. After the flushed dirty oil and sewage fall into the water collection bucket 34, they are sucked into the vacuum sewage tank 27, and the air is discharged into the atmosphere by the vacuum pump 26. When the water level in the vacuum sewage tank 27 reaches the set value, the water level probe 40 will send a signal to the vacuum pump 26, and the vacuum pump 26 will stop working. Start the sewage pump 28 to pump the dirty oil and sewage into the ground tank or press it into the underground oil collection pipe network.

[0045] Example 6: Cleaning the inner wall of the oil pipe in the well (see Figure 6 ) A winch 32, a guide wheel 34, a bracket 35, a tensile water pipe 33 and an oil pipe inner wall cleaner 38 are made respectively, and the wellhead blowout preventer 19 and the oil pipe self-sealing are installed in sequence at the wellhead. The tensile water pipe 33 has been wound on the winder 32, and the front end of the tensile water pipe 33 is connected to the boiler pressure pump, and the rear end is placed in the downhole oil pipe through the guide wheel 34. When cleaning begins, open the hot water valve 13, turn on the pressure pump, and the hot water changes from low pressure to high pressure. The hot water is directly pressed into the oil pipe inner wall cleaner 38 through the hot water pipe 33 to clean the inner wall of the oil pipe. The hot water entering the well displaces the well fluid upward out of the wellhead. The dirty oil and sewage enter the pressure pump through the sewage pipe, and are pumped into the ground water tank or the underground oil collection pipe network by the pressure pump.

Claims

1. An automatic cleaning device for oil rods and oil pipes, comprising: ① Methods for improving single-function steam boilers, upgrading steam single-function boilers to steam and hot water dual-function boilers. ② Automatic cleaning system: mainly using steam-carrying water special oil rod cleaners and oil pipe cleaners. ③ Automatic recovery system: including vacuum sewage tanks and sewage pumps. ④ Steam and water transmission system: including hot water pipes, hot water valves and special booster pumps for underground cleaning. ⑤ The equipment is divided into two types: integral type and split type.

2. According to claim 1, the improved and upgraded dual-function boiler is characterized in that: ① Install a hot water outlet pipe on the boiler, and install a hot water valve on the end of the hot water pipe; install a regulating valve between the steam pipe and the hot water pipe. One side of the regulating valve is connected to the hot water pipeline. The other side is connected to the steam pipeline. The regulating valve is mainly used to adjust the flow of hot water. In the process of using steam to carry water, the normal ratio of steam and hot water is achieved, thereby ensuring the cleaning quality; ② An electric steam valve is added to the outlet of the manual steam valve of the boiler and connected to the manual steam valve. The electric steam valve is controlled by a remote control for automatic cleaning during the cleaning process; the manual steam valve is used to completely close the steam pipe after cleaning.

3. According to claim 1, the special oil rod cleaning device using steam and water mainly functions to spray a mixture of steam and hot water onto the oil rod. It is characterized by Its internal structure and the shape and size of the spray hole. After repeated design and multiple trials, it has achieved the cleaning and water-saving effects; The oil pipe cleaner using steam and water mainly functions to spray steam mixed with hot water onto the oil pipe. The feature of the cleaner is that the number, shape and size of the spray holes have been repeatedly designed, achieving the cleaning and water-saving effects during use.

4. According to claim 1, the automatic oil and sewage recovery system is characterized by: The system is equipped with a vacuum pump, a sewage pump, a water level gauge, a water level probe and a vacuum sewage tank. An automatic air-water separation baffle is installed on the top of the vacuum sewage tank, which is used to automatically separate air and water. The vacuum sewage tank is generally cylindrical (it can also be made into other shapes) with a working pressure of -0.1MPa. The vacuum tank is equipped with an inlet for dirty oil and sewage and an outlet for air; when the oil rod and oil pipe cleaning begins, the vacuum pump automatically starts to suck the dirty oil and sewage generated by the cleaning into the vacuum sewage tank. When the water level in the vacuum sewage tank reaches a certain height, the water level probe will transmit the water level signal to the vacuum pump, and the vacuum pump will automatically stop absorbing water. Start the sewage pump to discharge the dirty oil and sewage from the vacuum sewage tank.

5. According to claim 1, the hot water pipe, hot water valve and pressure pump are characterized in that: The hot water pipe and hot water valve are installed at an appropriate height of the pot body, and the lower end of the hot water valve is connected to the inlet of the pressure pump. When cleaning the oil pipe underground, the outlet of the pressure pump is connected to the winch of the underground oil pipe cleaning machine made by our company, and the oil pipe is cleaned underground with hot water.

6. According to claim 1, the split type is characterized in that: The whole equipment is divided into two parts. The heating and cleaning system is the first part. It includes boiler, water supply pump, regulating device (water storage tank, oil rod cleaner and oil pipe cleaner with steam and water). The second part is the sewage recovery system, including: vacuum recovery tank, recovery pump, vacuum pump and other components. The characteristics of the parts are: when constructing at the well site, the first part is placed at a distance of 15-20m from the wellhead, and the second part is placed at a close distance of 3-5m from the wellhead.

Images