CN111102209B - Electric submersible pump backflow lifting device and backflow lifting method applied to low-yield well - Google Patents
Electric submersible pump backflow lifting device and backflow lifting method applied to low-yield well Download PDFInfo
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- CN111102209B CN111102209B CN201911371208.3A CN201911371208A CN111102209B CN 111102209 B CN111102209 B CN 111102209B CN 201911371208 A CN201911371208 A CN 201911371208A CN 111102209 B CN111102209 B CN 111102209B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 124
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 79
- 238000010992 reflux Methods 0.000 claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 230000001012 protector Effects 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims description 15
- 238000000926 separation method Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 36
- 238000000605 extraction Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 8
- 239000003129 oil well Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 210000001624 hip Anatomy 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
- F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/128—Adaptation of pump systems with down-hole electric drives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
- F04D15/0245—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump
- F04D15/0263—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump the condition being temperature, ingress of humidity or leakage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to an electric submersible pump backflow lifting device and a backflow lifting method applied to a low-yield well, wherein the electric submersible pump backflow lifting device applied to the low-yield well comprises an electric submersible pump, an electric submersible pump protector, a gas-water separator, a multistage centrifugal pump, an oil pipe, a liquid backflow valve and a temperature control valve system, wherein the liquid backflow valve is arranged on the pipe wall of the gas-water separator; the temperature control valve system comprises an underground generator, a circuit board, a rotary valve and a motor, wherein a temperature sensor is arranged at the position of the electric submersible pump and connected with the circuit board, the circuit board is connected with the motor, an output shaft of the motor upwards extends to the side face of the gas-water separator, the upper end of the output shaft of the motor is connected with the rotary valve, the rotary valve controls the flow of the liquid reflux valve, and the underground generator is in short connection below the electric submersible pump. The invention can effectively reduce the temperature of the electric submersible pump while ensuring the liquid production amount of the low-yield well, and solves the problem that the temperature of the electric submersible centrifugal pump on the ocean oil production platform is overhigh in the production process.
Description
The technical field is as follows:
the invention relates to the field of artificial lifting of electric submersible centrifugal pumps, in particular to an electric submersible pump backflow lifting device and a backflow lifting method applied to a low-yield well.
Background art:
the artificial lifting method is to artificially supplement energy to the bottom of an oil well and lift the oil in an oil reservoir to the well mouth. With the continuous increase of the total quantity of the produced oil, the oil reservoir pressure is gradually reduced; in the oil field developed by water injection, the water production percentage of the oil well is gradually increased, the specific gravity of the fluid is increased, and the self-spraying capacity of the oil well is gradually weakened under the two conditions. In order to improve the yield, the oil extraction by an artificial lifting method (also called mechanical oil extraction) is required to be adopted, which is a main mode of oil field exploitation, and particularly, in the later stage of oil field development, a pumping oil extraction method and a gas lifting oil extraction method are adopted.
The offshore oil field has better effect due to the limitation of environmental factors by adopting the electric submersible centrifugal pump. An electric submersible centrifugal pump, called an electric pump for short, is an underground lifting device for pumping oil by putting a motor and a pump below the liquid level in an oil well. The electric submersible pump is a multistage centrifugal pump working underground, and is put into a well together with an oil pipe, a ground power supply transmits electric energy to the underground electric submersible pump through a transformer, a control screen and an oil-submersible cable, so that the motor drives the multistage centrifugal pump to rotate, the electric energy is converted into mechanical energy, and well fluid in the oil well is lifted to the ground. In recent years, the lifting technology of the electric submersible pump at home and abroad is developed rapidly, and most of crude oil is produced by the electric submersible pump in oil field production, particularly in a high water-cut period. The electric submersible pump plays an important role in the lifting technology of non-self-blowing high-yield wells and high-water-content wells.
The electric submersible centrifugal pump mainly drives the whole electric submersible centrifugal pump to carry out oil extraction work by means of the electric submersible pump, wherein the electric submersible pump can generate larger heat when working. The underground liquid quantity in the low-yield well is less, the effect of carrying heat is greatly reduced, the temperature of the electric submersible pump is overhigh, the pump is burnt, and the whole pump set is damaged.
The invention content is as follows:
the invention aims to provide an electric submersible pump backflow lifting device applied to a low-yield well, which is used for solving the problem that a submersible electric pump is overhigh in temperature and causes pump burning in the oil production process of the low-yield well, and also aims to provide a backflow lifting method of the electric submersible pump backflow lifting device applied to the low-yield well.
The technical scheme adopted by the invention for solving the technical problems is as follows: the electric submersible pump backflow lifting device applied to the low-yield well comprises an electric submersible pump, an electric submersible pump protector, a gas-water separator, a multistage centrifugal pump, an oil pipe, a liquid backflow valve and a temperature control valve system, wherein the oil pipe is connected with the multistage centrifugal pump through a check valve; the temperature control valve system comprises an underground generator, a circuit board, a rotary valve and a motor, a temperature sensor is arranged at the position of an electric submersible pump, the temperature sensor is connected with the circuit board, the circuit board is connected with the motor, a motor output shaft is inserted above the motor, the motor output shaft upwards extends to the side face of a gas-water separator, the upper end of the motor output shaft is connected with the rotary valve, the rotary valve controls the flow of a liquid reflux valve, the underground generator is in short connection below the electric submersible pump, one end of a connecting cable is connected with the underground generator, and the.
In the scheme, the liquid reflux valve is trapezoidal, two trapezoidal waists are connected with the gas-water separator, the shorter bottom of the trapezoid is arranged outside the gas-water separator, the longer bottom of the trapezoid is arranged inside the gas-water separator, and the liquid reflux valve is positioned above the centrifugal turbine of the gas-water separator and below the gas-water separation pipeline.
The liquid reflux valve has 4 in the above scheme, and evenly distributed is around the gas-water separator pipe wall, and rotary valve has 4, and every rotary valve connects corresponding motor output shaft and motor.
The backflow lifting method of the electric submersible pump backflow lifting device applied to the low-yield well comprises the following steps:
after the gas and the liquid mixture in the sleeve enter the gas-water separator, the gas is discharged out of the gas-water separator along a gas-water separation pipeline at the central position of the gas-water separator under the action of a centrifugal turbine and enters the sleeve due to the gas-liquid density difference; the liquid is close to the pipe wall of the gas-water separator, the outer layer near the pipe wall of the water separator has larger liquid pressure energy and is easy to enter the sleeve through the liquid reflux valve, the inner layer slightly far away from the pipe wall of the water separator has smaller liquid pressure energy and is easy to enter the multistage centrifugal pump through the gas-water separation pipeline above the multistage centrifugal pump and then enter the oil pipe, and the effect of manually lifting the liquid is achieved;
because the liquid reflux valve is trapezoidal, after fluid enters the sleeve through the liquid reflux valve, the pressure outside the liquid reflux valve is reduced, the liquid continuously enters the sleeve through the liquid reflux valve under the action of the pressure, the liquid amount in the sleeve is supplemented by the refluxed liquid, the refluxed liquid amount reaches the liquid amount required by the cooling of the electric submersible pump, the refluxed liquid downwards reaches the position even lower than the electric submersible pump under the action of gravity, and the electric submersible pump is cooled in a heat exchange mode;
the temperature sensor detects the temperature of the electric submersible pump, the circuit board controls the rotation angle of the output shaft of the motor according to the temperature of the electric submersible pump and the set safe temperature, the rotation angle of the rotary valve is adjusted, the flow rate of the liquid reflux valve is changed, when the temperature of the electric submersible pump is higher than the set safe temperature, the liquid reflux valve is gradually opened, and the opening degree of the liquid reflux valve is larger when the temperature is higher; when the submersible electric pump is lower than or equal to the set safe temperature, the liquid reflux valve is gradually closed, the lower the temperature is, the smaller the opening degree of the liquid reflux valve is, so that the automatic control of the temperature is realized.
The invention has the following beneficial effects:
1. the invention can effectively reduce the temperature of the submersible electric pump while ensuring the liquid volume extracted by the low-yield well, so that the whole oil extraction device can stably work, and the problem that the temperature of the electric submersible centrifugal pump on an ocean oil extraction platform is overhigh in the extraction process is solved.
2. The invention can realize the automatic control of the temperature of the electric submersible pump and has good energy-saving effect.
Description of the drawings:
FIG. 1 is a schematic view of an electric submersible pump reflux lifting device for a low-production well according to the present invention;
FIG. 2 is a schematic view showing the internal structure of a gas-water separator according to the present invention;
FIG. 3 is a diagram of a thermostatic valve system of the present invention;
FIG. 4 is a diagram of an experimental laboratory apparatus for verifying the present invention.
In the figure: the system comprises an electric submersible pump 1, an electric submersible pump protector 2, a gas-water separator 3, a multistage centrifugal pump 4, a liquid reflux valve 5, a power transmission cable 6, an oil pipe 7, a check valve 8, a cable packer 9, a casing pipe 10, a centrifugal turbine 11, a gas-water separation pipeline 12, gas 13, liquid 14, a gas-water mixture 15, a transmission shaft 16, an inlet 17, a pressure sensor 18, a flowmeter 19, a temperature control valve system 20, a downhole generator 21, a connecting cable 22, a temperature sensor 23, a circuit board 24, a motor output shaft 25, a rotary valve 26 and a motor 27.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in figure 1, the electric submersible pump backflow lifting device applied to the low-yield well comprises an electric submersible pump 1, an electric submersible pump protector 2, a gas-water separator 3, a multistage centrifugal pump 4, an oil pipe 7, a liquid backflow valve 5 and a temperature control valve system 20, wherein a check valve 8 is in short connection with the lower portion of the oil pipe 7, the multistage centrifugal pump 4 is in short connection with the lower portion of the check valve 8, the upper port of the gas-water separator 3 is connected with the lower port of the multistage centrifugal pump 4, the electric submersible pump protector 2 is in short connection with the lower portion of the gas-water separator 3, the electric submersible pump 1 is in short connection with the lower port of the electric submersible pump protector 2, one end of a power transmission cable 6 is connected with an upper platform, one end of the power transmission cable is connected with the electric submersible pump 1 through a cable packer 9, the cable packer 9 is arranged at the bottom of the.
Referring to fig. 3, the temperature-controlled valve system 20 includes a downhole generator 21, a connection cable 22, a temperature sensor 23, a circuit board 24, a motor output shaft 25, a rotary valve 26, and a motor 27. The temperature sensor 23 is arranged near the electric submersible pump 1, the temperature sensor 23 is connected with a circuit board 24, one end of the circuit board 24 is connected with the temperature sensor 23, one end of the circuit board is connected with a motor 27, a motor output shaft 25 is inserted above the motor 27, the motor output shaft 25 upwards extends to the side face of the gas-water separator 3, the upper end of the motor output shaft 25 is connected with a rotary valve 26, the rotary valve 26 controls the flow of the liquid reflux valve 5, the underground generator 21 is in short connection below the electric submersible pump 1, one end of a connecting cable 22 is connected with the underground generator 21, and the other end of the.
The liquid reflux valve 5 is trapezoidal, two trapezoidal waists are connected with the gas-water separator 3, the shorter bottom of the trapezoid is arranged outside the gas-water separator 3, the longer bottom of the trapezoid is arranged inside the gas-water separator 3, referring to fig. 2, the liquid reflux valve 5 is positioned above a centrifugal turbine 11 of the gas-water separator and below a gas-water separation pipeline 12, the centrifugal turbine 11 is driven by a transmission shaft 16 to operate, and an inlet is arranged at the bottom of the gas-water separator 3. The number of the liquid reflux valves is 4, the liquid reflux valves are uniformly distributed on the periphery of the pipe wall of the gas-water separator 3, the number of the rotary valves is 4, and each rotary valve 26 is connected with the corresponding motor output shaft 25 and the corresponding motor 27.
The invention belongs to a pumping oil production method in an artificial lifting method, and mainly focuses on an artificial lifting method for an offshore oil field. The offshore oil field has better effect due to the limitation of environmental factors by adopting the electric submersible centrifugal pump. The electric submersible centrifugal pump mainly drives the whole electric submersible centrifugal pump to carry out oil extraction work by the electric submersible pump 1, wherein the electric submersible pump 1 can generate larger heat when working. In a normal oil production well, the liquid amount in the well is sufficient, the temperature is low, and in the liquid production process, the heat generated by the electric submersible pump 1 is carried to the gas-water separator 3 by the fluid through heat exchange in the flowing process so as to achieve the effect of cooling the electric submersible pump 1. The underground liquid volume is less in the low-yield well, the effect of carrying heat is greatly reduced, the temperature of the electric submersible pump 1 is overhigh, the pump is burnt, and the whole pump set is damaged.
Aiming at the problem that the temperature of an electric submersible centrifugal pump on an offshore oil production platform is overhigh in the process of production, the invention adopts the scheme that a liquid reflux valve 5 is arranged on a gas-water separator 3. After the gas and the liquid mixture in the sleeve 10 enter the gas-water separator 3, the gas is discharged out of the gas-water separator 3 along the gas-water separation pipeline 12 at the central position of the gas-water separator 3 under the action of the centrifugal turbine 11 due to the gas-liquid density difference and enters the sleeve 10; the liquid can be in being close to the pipe wall position, because liquid reflux valve 5 is trapezoidal, and set up trapezoidal shorter one end in the 3 outsides of deareator, trapezoidal longer one section sets up inside deareator 3, such shape can make and get into behind sleeve pipe 10 when the fluid passes through liquid reflux valve 5, the outside pressure of liquid reflux valve 5 diminishes, let the continuous liquid that gets into sleeve pipe 10 through liquid reflux valve 5 under the pressure effect, guarantee the liquid measure of backward flow, the liquid of backward flow is under the action of gravity, will reach the position of diving oily charge pump 1 even lower downwards, reach the effect of cooling oily charge pump 1 through the mode of heat exchange.
The low-yield well casing 10 has a lower liquid temperature, but has a lower liquid amount, which is not good for cooling the submersible electric pump 1. A large amount of liquid flows out of the liquid reflux valve 5 on the gas-water separator 3, the temperature of the flowing-out liquid is low, and the liquid refluxed in the liquid reflux valve 5 supplements the liquid amount in the sleeve 10, so that the cooling effect of the submersible electric pump 1 is achieved.
The temperature sensor 23 detects the temperature of the electric submersible pump 1, the circuit board 24 controls the rotation angle of the motor output shaft 25 according to the temperature of the electric submersible pump 1 and the set safe temperature, so that the rotation angle of the valve can be adjusted, the flow rate of the valve can be changed, when the temperature of the electric submersible pump 1 is higher than the set safe temperature, the valve is gradually opened, the temperature is higher, the opening degree of the valve is larger, and when the temperature of the electric submersible pump 1 is smaller than or equal to the set safe temperature, the valve is gradually closed, the temperature is lower, and the opening degree. Thereby realizing the automatic control of the temperature and having good energy-saving effect. The circuit board 24 controls the rotation angle of the motor output shaft 25 according to the ambient temperature and the set temperature, and belongs to the prior art.
In the centrifugal process, the mechanical energy of liquid flow is converted into pressure energy, the liquid reaches a position close to the pipe wall under the action of a centrifugal turbine 11, the liquid pressure energy at the outer layer is larger at the moment and easily enters a sleeve 10 through a liquid reflux valve 5, the liquid pressure energy at the inner layer is smaller and easily enters a multistage centrifugal pump 4 through an upper gas-water separation pipeline 12 and further enters an oil pipe 7, and the effect of manually lifting the liquid is achieved; and meanwhile, the size of the rotary valve 26 on the liquid reflux valve 5 is controlled by the temperature of the electric submersible pump 1, so that the extracted liquid amount is controlled, more liquid is used for cooling the electric submersible pump 1 when the temperature of the electric submersible pump 1 is higher, and more liquid is used for extracting when the temperature of the electric submersible pump 1 is lower. Therefore, the temperature of the electric submersible pump 1 can be effectively reduced while the liquid production amount is ensured, and the whole oil production device can stably work.
In order to verify that the temperature of the electric submersible pump can be effectively reduced, the invention is secretly tested by adopting an indoor experimental device, and the experimental device is shown in figure 4.
The indoor experimental device mainly comprises an electric submersible pump 1, an electric submersible pump protector 2, a gas-water separator 3, a multistage centrifugal pump 4, a liquid reflux valve 5, a transmission cable 6, an oil pipe 7, a check valve 8, a cable packer 9, a sleeve 10, a temperature sensor 23, a pressure sensor 18, a flowmeter 19, an underground generator 21, a connecting cable 22, a circuit board 24, a motor output shaft 25, a rotary valve 26 and a motor 27.
The check valve 8 is in short circuit with the lower part of the oil pipe 7, the lower part of the check valve 8 is in short circuit with the multistage centrifugal pump 4, the upper port of the gas-water separator 3 is connected with the lower port of the multistage centrifugal pump 4, the electric submersible pump protector 2 is in short circuit with the lower part of the gas-water separator 3, the lower port of the electric submersible pump is in short circuit with the electric submersible pump 1, one end of the power transmission cable 6 is connected with the upper platform of the well, the other end of the power transmission cable is connected with the electric submersible pump 1 through a cable packer 9, the cable packer 9 is arranged at the bottom of the oil pipe 7 and above the check valve 8, the liquid reflux valve 5 is arranged on the pipe wall of the gas-water separator 3, and the temperature control valve system 20 comprises a downhole generator. The temperature sensor 23 is arranged near the electrical submersible pump 1, the temperature sensor 23 is connected with a circuit board 24, one end of the circuit board 24 is connected with the temperature sensor 23, one end of the circuit board 24 is connected with a motor 27, a motor output shaft 25 is inserted above the motor 27, the upper end of the motor output shaft 25 is connected with a rotary valve 26, the rotary valve controls the flow of the liquid reflux valve 5, the underground generator 21 is short-circuited below the electrical submersible pump 1, one end of a connecting cable 22 is connected with the underground generator 21, one end of the connecting cable is connected with the circuit board 24, the number of the pressure sensors 18 is two, one pressure sensor is arranged at the bottom of a sleeve 10, the sleeve in the experimental device is provided with a bottom, the other pressure sensor is arranged near the outer part of the liquid reflux valve 5, the second temperature.
The liquid reflux valve 5 is in a trapezoid shape, the shorter end of the trapezoid is arranged outside the gas-water separator 3, and the longer section of the trapezoid is arranged inside the gas-water separator 3. The position is above a centrifugal turbine 11 in the gas-water separator 3 and below a gas- water separation pipeline 12, and 4 liquid reflux valves 5 are distributed around the gas-water separator 3.
Preparation of the experiment: 5L of water and carbon dioxide were injected into the casing 10, and the pressure sensor 23 indicated the initial pressure in the casing 10, and the overall pressure was 6 MPa.
The experiment was started: turning on the electric submersible pump, when carbon dioxide and water enter the gas-water separator 3, under the action of the centrifugal turbine 11, gas can be discharged out of the gas-water separator 3 along the gas-water separation pipeline 12 at the central position of the gas-water separator 3 due to gas-liquid density difference, and then enters the sleeve 10; the liquid will be in the position near the pipe wall, and some of them will get into sleeve pipe 10 through liquid reflux valve 5 under the pressure can effect, record sleeve pipe 10 pressure and the liquid reflux valve 5 outside near pressure this moment, and the pressure of liquid reflux valve 5 outside is very little, lets the liquid keep getting into sleeve pipe 10, liquid reflux valve 5 through liquid reflux valve 5 under the pressure effect. The returning liquid will reach down to the submersible electric pump 1 even lower under the influence of gravity. The experiment is carried out for 20min, the flow and the produced water quantity at the position of the liquid reflux valve 5 are recorded when the experiment is carried out for 20min, and the temperature of the electric submersible pump 1 is recorded simultaneously.
The indoor test shows that the pressure in the sleeve 10 is 4MPa when the test is started, the pressure near the liquid reflux valve 5 is 1.2MPa, the flow at the position of the liquid reflux valve 5 is 120ml/min after 20 minutes, 1.8L of water is collected, and the temperature of the electric submersible pump 1 is 74 ℃ at the moment, which accords with the safe working temperature.
Claims (2)
1. The utility model provides an be applied to electric submersible pump backward flow lifting devices of low yield well which characterized in that: the electric submersible pump backflow lifting device applied to the low-yield well comprises an electric submersible pump (1), an electric submersible pump protector (2), a gas-water separator (3), a multistage centrifugal pump (4), an oil pipe (7), a liquid backflow valve (5) and a temperature control valve system (20), wherein the oil pipe (7) is connected with the multistage centrifugal pump (4) through a check valve (8), the lower end of the multistage centrifugal pump (4) is connected with the gas-water separator (3), the electric submersible pump protector (2) is in short connection with the lower part of the gas-water separator (3), the lower port of the electric submersible pump protector (2) is in short connection with the electric submersible pump (1), and the liquid backflow valve (5) is arranged on the pipe wall of the gas-water separator (3); the temperature control valve system (20) comprises an underground generator (21), a circuit board (24), a rotary valve (26) and a motor (27), wherein a temperature sensor (23) is arranged at the position of the electric submersible pump (1), the temperature sensor (23) is connected with the circuit board (24), the circuit board (24) is connected with the motor (27), a motor output shaft (25) is inserted above the motor (27), the motor output shaft (25) upwards extends to the side surface of the gas-water separator (3), the rotary valve (26) is connected to the upper end of the motor output shaft (25), the rotary valve (26) controls the flow of the liquid reflux valve (5), the underground generator (21) is in short circuit below the electric submersible pump (1), one end of a connecting cable (22) is connected with the underground generator (21), and the other end of the connecting cable;
the liquid reflux valve (5) is trapezoidal, the two sides of the trapezoid are connected with the gas-water separator (3), the shorter bottom of the trapezoid is arranged outside the gas-water separator (3), the longer bottom of the trapezoid is arranged inside the gas-water separator (3), the liquid reflux valve (5) is positioned above the centrifugal turbine (11) of the gas-water separator and below the gas-water separation pipeline (12);
the liquid reflux valves (5) are 4, evenly distributed on the periphery of the pipe wall of the gas-water separator (3), the number of the rotary valves (26) is 4, and each rotary valve (26) is connected with the corresponding motor output shaft (25) and the corresponding motor (27).
2. The backflow lifting method of the electric submersible pump backflow lifting device applied to the low-production well, as claimed in claim 1, is characterized in that:
after the gas and the liquid mixture in the sleeve enter the gas-water separator (3), the gas is discharged from the gas-water separator (3) along a gas-water separation pipeline (12) at the central position of the gas-water separator (3) under the action of a centrifugal turbine (11) due to gas-liquid density difference and enters the sleeve (10); the liquid is close to the pipe wall of the gas-water separator, the outer layer liquid pressure close to the pipe wall of the gas-water separator has larger energy and is easy to enter a sleeve (10) through a liquid reflux valve (5), the inner layer liquid pressure slightly far away from the pipe wall of the gas-water separator has smaller energy and is easy to enter a multistage centrifugal pump (4) through a gas-water separation pipeline (12) above the liquid, and then enter an oil pipe (7) to achieve the effect of manually lifting the liquid;
because the liquid reflux valve (55) is trapezoidal, after fluid enters the casing (10) through the liquid reflux valve (5), the pressure outside the liquid reflux valve (5) is reduced, the liquid continuously enters the casing (10) through the liquid reflux valve (5) under the action of the pressure, the liquid amount in the casing (10) is supplemented by the refluxed liquid, the liquid amount refluxed reaches the liquid amount required for cooling the electric submersible pump (1), the refluxed liquid downwards reaches the position of the electric submersible pump even lower under the action of gravity, and the electric submersible pump (1) is cooled in a heat exchange mode;
the temperature sensor (23) detects the temperature of the electric submersible pump (1), the circuit board (24) controls the rotation angle of the motor output shaft (25) according to the temperature of the electric submersible pump (1) and a set safe temperature, the rotation angle of the rotation valve (26) is adjusted, the flow of the liquid reflux valve (5) is changed, when the temperature of the electric submersible pump (1) is higher than the set safe temperature, the liquid reflux valve (5) is gradually opened, and the higher the temperature is, the larger the opening of the liquid reflux valve (5) is; when the submersible electric pump (1) is lower than or equal to the set safe temperature, the liquid reflux valve (5) is gradually closed, the lower the temperature is, the smaller the opening degree of the liquid reflux valve (5) is, so that the automatic control of the temperature is realized, when the temperature of the submersible electric pump (1) is higher, more liquid is used for cooling the submersible electric pump (1), and when the temperature of the submersible electric pump (1) is lower, more liquid is used for extracting.
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| CN201911371208.3A CN111102209B (en) | 2019-12-26 | 2019-12-26 | Electric submersible pump backflow lifting device and backflow lifting method applied to low-yield well |
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| CN111608638B (en) * | 2020-06-24 | 2022-10-14 | 中国石油天然气股份有限公司 | Single-motor-driven double-pump underground oil-water separation same-well injection and production device and method |
| CN112253053B (en) * | 2020-11-02 | 2022-06-10 | 东北石油大学 | Foaming device and oil recovery lifting devices |
| CN112483048A (en) * | 2020-11-26 | 2021-03-12 | 东北石油大学 | Backflow liquid supplementing short circuit device for lifting oil well electric submersible pump |
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| US6260627B1 (en) * | 1999-11-22 | 2001-07-17 | Camco International, Inc. | System and method for improving fluid dynamics of fluid produced from a well |
| WO2002072998A1 (en) * | 2001-03-12 | 2002-09-19 | Centriflow Llc | Method for pumping fluids |
| US6932160B2 (en) * | 2003-05-28 | 2005-08-23 | Baker Hughes Incorporated | Riser pipe gas separator for well pump |
| CN201531400U (en) * | 2009-09-15 | 2010-07-21 | 河南华盛能源工程有限公司 | Intelligent drainage and production device for immersed pump in coal bed gas wells |
| CN103438255B (en) * | 2013-08-31 | 2015-07-15 | 苏州市燃气设备阀门制造有限公司 | Leakage-proof pressure valve |
| CN104653155A (en) * | 2014-12-11 | 2015-05-27 | 中国石油天然气股份有限公司 | Exploratory well electric pump formation test and production test liquid discharging device and system |
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