High-temperature and high-viscosity testing device for submersible double-screw pump

Abstract

The invention discloses a submersible double-screw pump high-temperature and high-viscosity test device, which comprises a double-screw pump test cylinder, a medium oil tank, a gas compressor, a gas mixing instrument machine, a power system and a heating system, a double-screw pump is arranged in the double-screw pump test cylinder, the double-screw pump is connected with the power system, a liquid outlet of the double-screw pump is communicated with the medium oil tank, and a liquid outlet of the double-screw pump is communicated with the gas mixing instrument machine. The medium oil tank is communicated with the gas mixing instrument machine, the gas mixing instrument machine is communicated with a liquid inlet of the double-screw pump and connected with the gas compressor, and the heating system is arranged outside the medium oil tank. The device can simultaneously test the lift, displacement, vibration and sound pressure characteristics of the double-screw pump under various medium conditions of single-phase oil flow, oil-gas mixed flow and the like, meets the simulation requirements of normal-temperature, high-temperature and high-viscosity working conditions, and achieves the purpose of evaluating the operation performance of the double-screw pump.

Description

Technical Field

[0001] The invention relates to the technical field of twin-screw pump testing, in particular to a high-temperature and high-viscosity testing device for a submersible twin-screw pump. Background Art

[0002] In the process of oil and gas extraction, it is usually necessary to take certain lifting measures to lift the oil from the bottom of the well to the ground. The screw pump is one of the most commonly used artificial lifting methods. In order to evaluate the operating performance of the screw pump, it is necessary to develop a test device for indoor lifting simulation evaluation. The traditional single screw pump test device is mainly used for normal temperature testing, with the maximum temperature not exceeding 80°C. However, for some heavy oils with high viscosity, heat injection is often required for extraction. The maximum heat injection temperature of steam injection, steam-assisted gravity drainage and steam flooding can reach more than 300°C. Therefore, in the face of such extreme environments such as high temperature, high pressure and high viscosity, a twin-screw pump technology with high temperature resistance has been developed. At the same time, it is necessary to develop a test device capable of evaluating the operating performance of the twin-screw pump under high temperature and high viscosity conditions. However, the existing technology fails to fully meet these test requirements, highlighting the necessity of developing new experimental devices. Therefore, a high temperature and high viscosity test device for submersible twin-screw pumps is proposed. Summary of the invention

[0003] The present invention provides a high temperature and high viscosity test device for a submersible twin-screw pump to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] A high temperature and high viscosity test device for a submersible twin-screw pump comprises a twin-screw pump test cylinder, a medium oil tank, a gas compressor, a gas blending instrument, a power system and a heating system. A twin-screw pump is arranged in the twin-screw pump test cylinder, the twin-screw pump is connected to the power system, a liquid outlet of the twin-screw pump is communicated with the medium oil tank, the medium oil tank is communicated with the gas blending instrument, the gas blending instrument is communicated with the liquid inlet of the twin-screw pump, the gas blending instrument is connected to the gas compressor, and the heating system is respectively arranged outside the medium oil tank.

[0006] Optionally, the heating system includes an electric heating belt, thermal insulation cotton and a temperature controller, the electric heating belt is arranged on the outside of the medium oil tank, the thermal insulation cotton is wrapped on the outside of the electric heating belt, and the electric heating belt is connected to the temperature controller.

[0007] Optionally, it also includes a monitoring system, which includes a temperature sensor, a flow meter and a pressure gauge. A plurality of first temperature sensors are installed in sequence above the twin-screw pump, the first temperature sensor is connected to the temperature display, a second temperature sensor and a first pressure gauge are provided on the medium oil tank, the second temperature sensor is connected to the temperature controller, a second pressure gauge is provided on the pipeline connecting the medium oil tank and the gas blending instrument, a third pressure gauge and a first flow meter are provided on the pipeline connecting the gas blending instrument and the gas compressor, and a fourth pressure gauge and a second flow meter are provided on the pipeline connecting the liquid outlet of the twin-screw pump and the medium oil tank.

[0008] Optionally, the power system includes a motor, a coupling and a frequency converter, the motor is connected to the twin-screw pump via the coupling, and the frequency converter is connected to the motor.

[0009] Optionally, an overflow collection cylinder is provided on the outer side of the medium oil tank, and the medium oil tank is connected to the overflow collection cylinder via a pressure relief valve.

[0010] Optionally, a first valve is provided between the first flow meter and the gas blender.

[0011] Optionally, a second valve is provided between the gas blender and the liquid inlet of the twin-screw pump, a third valve is provided between the second pressure gauge and the gas blender, a pipeline is connected in parallel upstream of the third valve and upstream of the second valve, and a fourth valve is provided on the pipeline.

[0012] Optionally, a fifth valve is provided between the fourth pressure gauge and the second flow meter.

[0013] Optionally, thermal insulation cotton is provided on the outer side of the twin-screw pump test cylinder.

[0014] In summary, the technical effects and advantages of the present invention are as follows: the device of the present application can simultaneously test the head, displacement, vibration and sound pressure characteristics of the twin-screw pump under various media conditions such as single-phase oil flow, oil-gas mixed flow, etc., meet the simulation requirements of normal temperature, high temperature and high viscosity working conditions, and achieve the purpose of evaluating the operating performance of the twin-screw pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a schematic structural diagram of a high temperature and high viscosity test device for a submersible twin-screw pump in one embodiment of the present invention.

[0017] Among them: 1. Twin-screw pump; 2. Twin-screw pump test tube; 3. Motor; 4. Gas compressor; 5. Gas blending instrument; 6. Medium oil tank; 7. Frequency converter; 8. Coupling; 9. Temperature controller; 10. Temperature display; 11. Electric heating belt; 12. First insulation cotton; 13. Second insulation cotton; 14. Liquid inlet; 15. Liquid outlet; 16. Pressure relief valve; 17. Overflow collection tube; 18. Second temperature sensor; 19. First temperature sensor; 20. First temperature sensor; 21. First temperature sensor; 22. First pressure gauge; 23. Fourth pressure gauge; 24. Second pressure gauge; 25. Third pressure gauge; 26. First flow meter; 27. Second flow meter; 28. Third valve; 29. ​​Second valve; 30. First valve; 31. Fourth valve; 32. Fifth valve. DETAILED DESCRIPTION

[0018] 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.

[0019] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] This embodiment provides a high temperature and high viscosity test device for a submersible twin-screw pump. Figure 1As shown, it includes a twin-screw pump test cylinder, a medium oil tank, a gas compressor, a gas blending instrument, a power system and a heating system. A twin-screw pump is arranged in the twin-screw pump test cylinder. The twin-screw pump is connected to the power system. The liquid outlet of the twin-screw pump is connected to the medium oil tank. The medium oil tank is connected to the gas blending instrument. The gas blending instrument is connected to the liquid inlet of the twin-screw pump. The gas blending instrument is connected to the gas compressor. The heating system is respectively arranged outside the medium oil tank. The twin-screw pump test cylinder is used to load the twin-screw pump body. The medium oil tank is used to store the test medium. The gas compressor provides the gas source. The power system is composed of a motor and a motor inverter. The power system and the twin-screw pump realize power transmission through a coupling. The test medium and the gas source are mixed through the gas-liquid blending instrument and then sucked into the twin-screw pump. The twin-screw pump drives the coupling to rotate through the motor. The test medium is lifted by the twin-screw pump and then circulates back to the medium oil tank. The heating system includes a temperature controller, an electric heating belt and thermal insulation cotton. The temperature controller is used to adjust the temperature of the electric heating belt to achieve heating of the test medium. The thermal insulation cotton is used to maintain the temperature of the test medium. The monitoring system includes a pressure gauge, a flow meter, a temperature sensor and a temperature display to respectively monitor the test pressure, flow and medium temperature. This set of test equipment can be used to test and evaluate the overall operating performance of the twin-screw pump when conveying pure liquid or gas-liquid mixture under high temperature and high viscosity conditions.

[0021] Among them, the right side of the twin-screw pump test cylinder 2 is connected with a coupling 8, a motor 3, and a frequency converter 7 in sequence, a twin-screw pump 1 is installed inside the twin-screw pump test cylinder 2, a first temperature sensor 19, a first temperature sensor 20, and a first temperature sensor 21 are installed in sequence above the twin-screw pump 1, the first temperature sensor 19, the first temperature sensor 20, and the first temperature sensor 21 are connected to a temperature display, a liquid inlet 14 is arranged above the twin-screw pump 1, a liquid outlet 15 is arranged on the left side of the twin-screw pump 1, a second thermal insulation cotton 13 is wrapped around the outer periphery of the twin-screw pump test cylinder, the liquid inlet 14 is connected to a gas-liquid mixing instrument 5, the gas-liquid mixing instrument 5 is connected to a gas compressor 4 above the gas-liquid mixing instrument 5, and the gas-liquid mixing instrument 5 is connected to A third pressure gauge 25 and a first flow meter 26 are installed between the gas compressor 4, the left side of the gas-liquid blending instrument 5 is connected to the medium oil tank 6, a second pressure gauge 24 is installed between the left side of the gas-liquid blending instrument 5 and the medium oil tank 6, an electric heating belt 11 is wrapped around the surface of the medium oil tank 6, and then the first thermal insulation cotton 12 is wrapped around the outer surface, a second temperature sensor 18 and a first pressure gauge 22 are installed on the medium oil tank 6, the medium oil tank 6 is connected to the temperature controller 9, a pressure relief valve 16 is installed on the left side of the medium oil tank 6, the pressure relief valve 16 is connected to the overflow collection cylinder 17, the right side of the medium oil tank 6 is connected to the liquid outlet 15, and a second flow meter 27 and a fourth pressure gauge 23 are installed between the medium oil tank 6 and the liquid outlet 15. The surface of the medium oil tank is wrapped with an electric heating belt, and the heating temperature is set by the temperature controller to achieve heating of the test medium, meeting the performance test requirements of the twin-screw pump under high temperature conditions, and a layer of thermal insulation cotton is wrapped around the outer surface of the electric heating belt and the outer surface of the twin-screw test cylinder to ensure that the temperature of the test medium is stable.

[0022] The test device can carry out a twin-screw pump operation test of a gas-liquid mixture or a pure liquid. The gas compressor 4 and the medium oil tank 6 provide a gas source and a liquid source respectively. After being mixed by the gas-liquid blending machine 5, the gas-liquid enters the twin-screw pump test cylinder through the liquid inlet 14 and then enters the twin-screw pump. The gas compressor can be enabled or disabled, which can be determined according to whether the test requires a gas-liquid mixture or a pure liquid.

[0023] The test device provides operating power for the whole machine through the motor 3, and transmits torque through the coupling 8 to realize the rotation of the screw pump. The operating parameters of the motor 3 are adjusted by the frequency converter 7.

[0024] The test device provides the liquid test medium required for circulation through the medium tank 6, which also serves as a collector for the test medium returned. The pressure relief valve 16 on the left side of the medium tank 6 has an automatic pressure relief function and can be opened at a fixed pressure, thereby ensuring that the pressure of the tank remains constant during heating or testing to prevent excessive pressure. After pressure relief, the test medium is received by the overflow collection tube 17 to ensure that the internal pressure of the medium tank does not exceed the permitted value.

[0025] The gas compressor 4 of the test device provides the gas source required for the gas-liquid mixing test. The gas compressor 4 can realize output gas pressure and output gas flow control. The outlet pressure of the gas compressor 4 is monitored by the third pressure gauge 25, and the gas flow of the gas compressor 4 is measured by the first flow meter 26.

[0026] The electric heating belt 11 wrapped around the periphery of the medium oil tank 6 of the test device generates heat through electric heating to heat the test medium. The heating temperature can be adjusted by a temperature controller 9. The temperature inside the medium oil tank 6 is monitored by a second temperature sensor 18. The pressure inside the medium oil tank 6 is monitored by a first pressure gauge 22. The outlet pressure of the medium oil tank 6 is monitored by a second pressure gauge 24.

[0027] The test medium in the medium tank 6 of the test device and the gas output from the gas compressor 4 are mixed by the gas-liquid blending instrument 5, and then enter the twin screw pump 1 from the liquid inlet 14 of the twin screw pump test tube 2 through the lifting effect of the twin screw pump 1, flow out from the liquid outlet 15, enter the medium tank 6 and be recycled, the outlet pressure of the twin screw pump 1 is monitored by the fourth pressure gauge 23, and the outlet flow is measured by the second flow meter 27. The first temperature sensor 19, the first temperature sensor 20, and the first temperature sensor 21 are respectively installed at the upper, middle and lower parts of the twin screw pump 1 to realize temperature monitoring of different parts of the twin screw pump. The test medium in the medium tank can be a high-viscosity test medium to meet the performance test requirements of the twin screw pump under high-viscosity conditions. The viscosity of the test medium can be calculated by the test temperature and the viscosity-temperature curve.

[0028] The electric heating belt 11 of the test device wraps the medium oil tank 6 in a circular winding manner, and the heat generated by the electric heating belt 11 is transferred to the medium oil tank 6, thereby heating the test medium. The heating power of the electric heating belt is adjusted by the temperature controller 9 to achieve regulation of the heating temperature from room temperature to 350°C high temperature, which can simulate the operation of the twin-screw pump under high temperature and high and low temperature alternating conditions.

[0029] The outer surfaces of the medium oil tank 6 and the twin-screw pump test cylinder 2 of the test device are respectively wrapped by the first thermal insulation cotton 12 and the second thermal insulation cotton 13 to achieve the thermal insulation effect on the test medium.

[0030] The temperature display 10 of the test device is connected to three first temperature sensors 19, 20, 21 installed at the upper, middle and lower parts of the twin-screw pump test cylinder to continuously monitor the temperature of different parts during the operation of the twin-screw pump.

[0031] The liquid inlet of the gas-liquid mixing instrument 5 of the test device is controlled by the third valve 28, and the air inlet is controlled by the first valve 30. When the gas-liquid mixing test is performed, the third valve 28, the second valve 29 and the first valve 30 are opened, and the fourth valve 31 is closed. When the pure liquid test is performed, the third valve 28 and the first valve 30 are closed, and the second valve 29 and the fourth valve 31 are opened, thereby realizing the test switching of different medium types. When the gas compressor is not enabled, the test medium in the medium tank can be directly flowed into the twin-screw pump test cylinder by closing the third valve 28 and the first valve 30, opening the second valve 29 and the fourth valve 31, so as to perform the test under the pure liquid condition. When the gas compressor is enabled, the test medium in the medium tank and the gas can be flowed through the gas-liquid mixing instrument by closing the fourth valve 31, opening the third valve 28, the second valve 29 and the first valve 30, and flowing into the twin-screw pump test cylinder after mixing, thereby performing the test under the gas-liquid mixed transmission condition. This embodiment can achieve test conditions of different temperatures, different viscosities, different pressures, and different fluid phases by adjusting the temperature controller, the viscosity of the test medium, the outlet valve, the activation of the gas compressor, and the switching coordination of the third valve 28, the second valve 29, the first valve 30, and the fourth valve 31, thereby meeting the whole machine operation test requirements of the twin-screw pump under high temperature, high viscosity, and high pressure conditions.

[0032] The test medium in the medium tank 6 of the test device can be replaced with a high-viscosity test medium, and combined with the heating system and the medium viscosity-temperature curve, the operation of the twin-screw pump under high-temperature low-viscosity, low-temperature high-viscosity and other working conditions can be simulated.

[0033] The fifth valve 32 at the outlet of the twin-screw pump test cylinder 2 of the test device can be used to adjust the test pressure at the outlet of the twin-screw pump to 25 MPa, simulating the operation of the twin-screw pump under high-pressure working conditions.

[0034] The test method of the test device comprises the following steps:

[0035] S1. Connect the components of the device through pipelines. The medium oil tank 6 and the gas compressor 4 are respectively connected to the gas blending machine 5 through pipelines. The gas blending machine 5 is connected to the twin-screw pump test cylinder 2 through pipelines. The twin-screw pump 1 is connected to the motor 3 through a coupling 8. The liquid outlet 15 of the twin-screw pump test cylinder is connected to the medium oil tank 6 through a pipeline.

[0036] S2. After the pipelines are connected, add the test medium into the medium tank 6 and set the pressure relief value of the pressure relief valve 16 to the specified pressure relief pressure;

[0037] S3. When conducting a pure liquid test, open the second valve 29, the fourth valve 31 and the fifth valve 32, and close the third valve 28 and the first valve 30. When conducting a gas-liquid mixed transmission test, open the third valve 28, the second valve 29, the first valve 30 and the fifth valve 32 to establish a circulation channel;

[0038] S4, start the temperature controller 9, set the required temperature for the test, and preheat the test medium through the electric heating belt. During the preheating and subsequent test process, the first insulation cotton 12 and the second insulation cotton 13 always maintain the insulation effect on the medium tank 6 and the twin-screw pump test cylinder 2;

[0039] S5. When the test temperature reaches the predetermined temperature and remains stable, the motor 3 is started to drive the twin-screw pump 1 to operate, the operating parameters of the twin-screw pump are controlled by the frequency converter 7, and the test pressure value is adjusted by the fifth valve 32. When the pure liquid test is performed, the test medium flows out of the medium tank 6 into the pipeline, flows through the fourth valve 31 and the second valve 29 in sequence, enters the twin-screw pump test cylinder 2 through the liquid inlet 14, and flows back to the medium tank 6 through the liquid outlet 15 and the fifth valve 32; gas-liquid mixed transmission is performed During the test, the test medium flows out of the medium tank 6 into the pipeline, flows through the third valve 28 in sequence, and enters the gas-liquid blending instrument 5. The gas generated by the gas compressor flows through the first valve 30 and enters the gas-liquid blending instrument 5. The blended gas-liquid mixture enters the twin-screw pump test cylinder 2 through the liquid inlet 14, and flows back to the medium tank 6 through the liquid outlet 15 and the fifth valve 32. When the pressure in the medium tank 6 exceeds the pressure relief value, the pressure relief valve 16 automatically opens, and the overflowed test medium is collected by the overflow collection cylinder 17.

[0040] S6. During the test, the speed and shaft power of the motor 3, the inlet and outlet pressures, the flow rate, the oil temperature, the oil viscosity obtained by the viscosity-temperature curve, the root mean square of the vibration velocity, and the noise decibel are recorded;

[0041] S7. Change the oil temperature, medium type, medium viscosity, test pressure, motor frequency, etc. to conduct twin-screw pump operation tests under different conditions, and obtain the displacement, head and hydraulic characteristic curve of the twin-screw pump under different test conditions, so as to provide a basis for the performance evaluation of the twin-screw pump and the selection of the twin-screw pump in the oil field.

[0042] The use process of the present invention is:

[0043] 1) Installation and connection of the device. The right side of the twin-screw pump test tube 2 is connected with a coupling 8, a motor 3, and a frequency converter 7 in sequence. The twin-screw pump test tube 2 is installed with a twin-screw pump 1 inside. The left, middle, and right positions of the twin-screw pump 1 are installed with a first temperature sensor 19, a first temperature sensor 20, and a first temperature sensor 21 in sequence. The first temperature sensor 19, the first temperature sensor 20, and the first temperature sensor 21 are connected to a temperature display. The liquid inlet 14 of the twin-screw pump 1 is arranged above it, and the liquid outlet 15 is arranged on its left side. The liquid inlet 14 is connected to a gas-liquid blending machine 5, and the gas-liquid blending machine 5 is connected to a gas compressor 4, and the gas-liquid blending machine 5 is connected to a gas compressor 4, the third pressure gauge 25 and the first flow meter 26 are installed between the gas-liquid mixing instrument 5 and the medium oil tank 6 on the left side, the second pressure gauge 24 is installed between the gas-liquid mixing instrument 5 and the medium oil tank 6 on the left side, the electric heating belt 11 is wrapped around the outer surface of the medium oil tank 6, and then the first thermal insulation cotton 12 is wrapped around the outer surface, the second temperature sensor 18 and the first pressure gauge 22 are installed on the medium oil tank 6, the medium oil tank 6 is connected to the temperature controller 9, the pressure relief valve 16 is installed on the left side of the medium oil tank 6, the pressure relief valve 16 is connected to the overflow collection cylinder 17, the right side of the medium oil tank 6 is connected to the liquid outlet 15, and the second flow meter 27 and the fourth pressure gauge 23 are installed between the medium oil tank 6 and the liquid outlet 15.

[0044] 2) Twin-screw pump test process: After the test device is installed, first add the test medium into the medium tank 6, adjust the automatic pressure relief value of the pressure relief valve 16 to the specified value, turn on the temperature controller 9 to set the heating temperature, and start preheating the test medium after the temperature is set. When the temperature collected by the second temperature sensor 18 reaches the set temperature and tends to be stable, open the second valve 29 and the fifth valve 32 to establish a circulation channel. When conducting a gas-liquid mixed transmission test, open the third valve 28 and the first valve 30, and close the fourth valve 31. When conducting a pure liquid test, open the third valve 28. The first valve 30 is closed, the fourth valve 31 is opened, and the motor 3 is started. The operating parameters of the motor 3 are adjusted by the frequency converter 7. After the motor 3 is started, the coupling 8 is driven to rotate, and the coupling 8 drives the twin-screw pump 1 to rotate. Under the lifting action of the twin-screw pump 1, the test medium is sucked into the inner cavity of the twin-screw pump 1 from the liquid inlet 14, and is lifted to the top of the twin-screw pump 1. After being discharged through the liquid outlet 15, it enters the medium tank 6. By adjusting the opening of the fifth valve 32, the test pressure is adjusted to the specified pressure level, thereby establishing the circulation of the test medium in the entire device. When the pressure in the medium tank 6 is Through monitoring by the first pressure gauge 22, when the pressure in the medium tank 6 exceeds the pressure relief value of the pressure relief valve 16, the pressure relief valve automatically opens and releases the pressure to the set value. During the operation of the twin-screw pump 1, the temperature at different positions of the twin-opening screw pump 1 is monitored by the first temperature sensor 19, the first temperature sensor 20 and the first temperature sensor 21. The flow rate during the test is measured by the second flow meter 27 and recorded in real time. When conducting a gas-liquid mixed transmission test, the gas flow rate and gas pressure during the test are measured by the first flow meter 26 and the third pressure gauge 25. The gas pressure is regulated by adjusting the first valve 30. The outlet pressure and displacement of the compressor can be measured. During the entire test process, the vibration tester and the sound pressure tester can be used to monitor the vibration characteristics and noise level of the twin-screw pump 1 during operation. By changing the viscosity of the test medium in the medium tank 6, low viscosity and high viscosity conditions can be simulated. By changing the temperature set by the temperature controller 9, normal temperature and high temperature conditions can be simulated. By adjusting the parameters of the frequency converter 7, the speed of the motor 3 can be adjusted. When the motor 3 runs stably, the flow rate, inlet and outlet pressures, twin-screw pump speed, vibration speed root mean square, noise decibels, medium oil temperature and viscosity under oil temperature conditions and other data during the entire test process are recorded.

[0045] This method can be used to test the pressure, displacement and other data of the twin-screw pump under different temperatures, different viscosities, different working pressures and different fluid phase conditions. It can be used to evaluate the operating performance of the twin-screw pump under simulated downhole conditions and provide support for field applications.

[0046] For ease of description, spatially relative terms such as "upper", "lower", "outer layer", "inner layer" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that in addition to the orientation shown in the figures, the spatial terms are intended to include different orientations of the device in use or operation. Therefore, the exemplary term "lower" can include both upper and lower orientations.

[0047] Furthermore, relational terms such as "3" and "4" etc. are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0048] Although the preferred implementation cases of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the invention spirit and claims, which all fall within the scope of protection of the present invention.

Claims

1. A high temperature and high viscosity test device for a submersible twin-screw pump, characterized in that: It includes a twin-screw pump test cylinder, a medium oil tank, a gas compressor, a gas blending instrument, a power system and a heating system. The twin-screw pump is arranged in the twin-screw pump test cylinder, the twin-screw pump is connected to the power system, the liquid outlet of the twin-screw pump is connected to the medium oil tank, the medium oil tank is connected to the gas blending instrument, the gas blending instrument is connected to the liquid inlet of the twin-screw pump, the gas blending instrument is connected to the gas compressor, and the heating system is respectively arranged outside the medium oil tank.

2. The high temperature and high viscosity test device for submersible twin-screw pumps according to claim 1, characterized in that: The heating system comprises an electric heating belt, thermal insulation cotton and a temperature controller. The electric heating belt is arranged outside the medium oil tank, the thermal insulation cotton is wrapped around the outside of the electric heating belt, and the electric heating belt is connected to the temperature controller.

3. The high temperature and high viscosity test device for submersible twin-screw pumps according to claim 2, characterized in that: It also includes a monitoring system, which includes a temperature sensor, a flow meter and a pressure gauge. A plurality of first temperature sensors are installed in sequence above the twin-screw pump, the first temperature sensor is connected to the temperature display, a second temperature sensor and a first pressure gauge are provided on the medium oil tank, the second temperature sensor is connected to the temperature controller, a second pressure gauge is provided on the pipeline connecting the medium oil tank and the gas blending instrument, a third pressure gauge and a first flow meter are provided on the pipeline connecting the gas blending instrument and the gas compressor, and a fourth pressure gauge and a second flow meter are provided on the pipeline connecting the liquid outlet of the twin-screw pump and the medium oil tank.

4. The high temperature and high viscosity test device for submersible twin-screw pumps according to claim 1, characterized in that: The power system comprises a motor, a coupling and a frequency converter. The motor is connected to the twin-screw pump via the coupling, and the frequency converter is connected to the motor.

5. The high temperature and high viscosity test device for submersible twin-screw pumps according to claim 1, characterized in that: An overflow collecting cylinder is arranged on the outer side of the medium oil tank, and the medium oil tank is connected with the overflow collecting cylinder through a pressure relief valve.

6. The high temperature and high viscosity test device for submersible twin-screw pumps according to claim 3, characterized in that: A first valve is provided between the first flow meter and the gas blending machine.

7. The high temperature and high viscosity test device for submersible twin-screw pumps according to claim 6, characterized in that: A second valve is provided between the gas blender and the liquid inlet of the twin-screw pump, a third valve is provided between the second pressure gauge and the gas blender, a pipeline is connected in parallel upstream of the third valve and upstream of the second valve, and a fourth valve is provided on the pipeline.

8. The high temperature and high viscosity test device for submersible twin-screw pumps according to claim 7, characterized in that: A fifth valve is provided between the fourth pressure gauge and the second flow meter.

9. The high temperature and high viscosity test device for submersible twin-screw pumps according to claim 1, characterized in that: The outer side of the twin-screw pump test cylinder is provided with heat-insulating cotton.

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