An automatic temperature-controlled high-voltage electric field crude oil viscosity reduction experimental device

Abstract

This paper proposes an automatic temperature-controlled high-voltage electric field crude oil viscosity reduction experimental device, the experimental device includes a crude oil preheating and conveying system, an electric field internal temperature adjustment control system and an electric field voltage adjustment system, and is characterized in that the crude oil preheating and conveying system includes a crude oil heating storage tank and a crude oil delivery pump, the electric field internal temperature adjustment control system includes a constant temperature water bath and a cooling spacing control tube, the electric field voltage adjustment system includes a high-voltage power supply, a power supply voltage regulator and an experimental tank body, and the crude oil temperature in the tank is controlled during the experiment by heat exchange between the constant temperature water of the constant temperature water bath and the crude oil. The electric field strength is adjusted by the voltage regulator to control various variables, thereby ensuring the accuracy and stability of the experimental device, and the experimental device that originally only simply performs high-voltage electric field reaction inside the experimental tube is improved into an experimental device with a cooling spacing control tube inside.

Description

Technical Field

[0001] The present invention belongs to the technical field of crude oil high-voltage electric field experiments, and specifically relates to an automatic temperature-controlled high-voltage electric field crude oil viscosity reduction experimental device. Background Art

[0002] The production and transportation of high-viscosity heavy crude oil has great technical limitations. Due to the high content of paraffin, colloid and asphaltene in high-viscosity crude oil, its fluidity is poor. Generally, some physical or chemical methods are needed to modify or modify these oil products to reduce viscosity and improve fluidity. So far, the viscosity reduction methods used by various oil fields in the production and gathering process mainly include: heating transportation process, adding chemical agents to reduce viscosity transportation process, adding thin oil to reduce viscosity transportation process and modifying and reducing viscosity transportation process. In addition, there are some methods that are being developed and explored, such as microbial viscosity reduction, ultrasonic viscosity reduction, microwave viscosity reduction and electric field viscosity reduction.

[0003] Among the existing technologies, electric field modification and viscosity reduction is a relatively cutting-edge and novel technology. Simply put, electric field modification is to apply a high-voltage electric field of a certain intensity to crude oil for a few seconds to reduce viscosity and yield stress. For some waxy crude oils, the viscosity near the pour point can be reduced by more than 80%, and the yield stress reduction rate can reach 90%, while its energy consumption is only 1% of the heating energy consumption when the same viscosity reduction rate is achieved. This method was first proposed in 2006 and has received support from many parties, and a small-scale field test has been carried out.

[0004] In the existing experimental environment, in order to test how much field strength is needed to minimize the viscosity of waxy crude oil at a constant crude oil temperature, most of the existing experimental equipment directly tests the viscosity of the crude oil after high pressure treatment in the test tube.

[0005] However, this form cannot meet the experimental environment of constant temperature crude oil because the crude oil itself will gradually heat up due to the high-voltage electric field. In addition, the operation of the large-area high-voltage electrode plate cannot be controlled with high precision. Most importantly, in the experimental environment, it is usually impossible to obtain sufficient voltage, so it is impossible to obtain an environment with sufficient high-voltage field strength to meet the experimental requirements. Summary of the invention

[0006] In order to solve the above problems, this paper proposes an automatic temperature-controlled high-voltage electric field crude oil viscosity reduction experimental device, the experimental device includes a crude oil preheating and transportation system, an electric field internal temperature adjustment control system and an electric field voltage adjustment system, characterized in that the crude oil preheating and transportation system includes a crude oil heating storage tank and a crude oil delivery pump, the electric field internal temperature adjustment control system includes a constant temperature water bath and a cooling spacing control tube, the electric field voltage adjustment system includes a high-voltage power supply, a power supply voltage regulator and an experimental tank body, the experimental tank body is nested inside and outside with a cooling spacing control tube and an experimental outer tube, the cooling The cooling spacing control tube and the experimental outer tube are nested inside and outside and aligned with each other's axes. The upper and lower ends of the cooling spacing control tube and the experimental outer tube are sealed and connected by flange surfaces. The material of the experimental outer tube is insulating material. A metal sleeve is embedded inside the middle inner side of the experimental outer tube. A cooling spacing control tube is vertically inserted into the inner center of the experimental outer tube. Crude oil is arranged between the experimental outer tube and the cooling spacing control tube. The material of the cooling spacing control tube is a metal steel pipe. A water inlet and a water outlet are arranged in the center of the bottom flange and the upper flange of the cooling spacing control tube. The upper and lower ends of the cooling spacing control tube are replaced by flanges. The cooling distance control tube is connected to the inside of the experimental outer tube, the distance between the outer wall of the cooling distance control tube and the inner wall of the experimental outer tube is set to an electric field control distance, the interior of the cooling distance control tube is provided with constant temperature water of a constant temperature water bath, the upper and lower sides of the metal sleeve of the experimental outer tube are respectively provided with an oil outlet and an oil inlet, the metal sleeve is connected to the high-voltage power supply through a power supply voltage regulator, the constant temperature water of the constant temperature water bath is heat-exchanged with the crude oil to realize the crude oil temperature control in the tank during the experiment, the electric field strength is adjusted by the voltage regulator, various variables can be controlled, and the experimental device is guaranteed. In order to improve the accuracy and stability, the experimental device, which was originally just a high-voltage electric field reaction inside the experimental tube, was improved into an experimental device with a cooling spacing control tube inside. The constant temperature water circulated inside the cooling spacing control tube can control the stability of the crude oil inside the experimental device and ensure the stable effect of the crude oil experiment. In addition, the electric field control spacing can be adjusted by replacing cooling spacing control tubes with different outer diameters, so as to obtain a greater high-voltage field strength effect under limited voltage conditions, which is convenient for the adjustment of the experimental equipment and can control various variables, ensuring the accuracy and stability of the experimental device.

[0007] The shape of the experimental outer tube is a vertical upper and lower conductive circular tube. The upper and lower ends of the experimental outer tube are provided with sealed connection flanges. The cooling spacing control tube inside the experimental outer tube is fixedly connected through the sealed connection flange. A ground wire is provided on the outer side of the bottom of the experimental outer tube. The upper and lower surfaces of the experimental outer tube are respectively provided with an oil outlet and an oil inlet. A metal sleeve is embedded in the inner side of the middle tube wall of the experimental outer tube in an annular manner. A section of the metal sleeve embedded in the interior of the experimental outer tube is the positive electrode of the high-voltage electric field. A protruding section of the metal sleeve welded is provided with a terminal. The terminal passes through the insulating outer tube and is connected to an AC power source or a DC power source. The metal inner tube is connected to an AC power source, a grounding terminal is welded to the metal inner tube, and the grounding terminal is connected to the grounding wire. A circular electric field is formed between the metal sleeve and the cooling spacing control tube. The maximum output voltage of the AC power supply or the DC power supply is 30,000 or 60,000 V. By embedding a metal sleeve in the middle of the experimental outer tube, the cooling spacing control tube can be conveniently installed through the sealing connecting flanges at the upper and lower ends, and the outer parts of the upper and lower ends of the metal sleeve are used to set the oil inlet and the oil outlet, which ensures the overall installation and prevents interference in the overall process.

[0008] The upper and lower ends of the cooling spacing control tube are provided with assembly flanges, and the centers of the assembly flanges on both ends of the cooling spacing control tube are penetrated with flow guide interfaces. The length of the cooling spacing control tube is the same as the length of the experimental outer tube, and the outer diameter of the cooling spacing control tube is smaller than the inner diameter of the experimental outer tube. The electric field control spacing between the outer wall of the cooling spacing control tube and the inner wall of the experimental outer tube is achieved by replacing cooling spacing control tubes with different outer diameters. The electric field control spacing is 10mm, 15mm, 20mm and 25mm, etc. By replacing cooling spacing control tubes with different outer diameters, not only automatic temperature control through circulating constant temperature water can be achieved, but also the electric field control spacing can be adjusted, thereby ensuring the field intensity regulation of most values, improving the adjustable range of the experimental device, adding more experimental variables, and ensuring the final experimental accuracy.

[0009] The upper and lower ends of the cooling spacing control tube are connected to the constant temperature water bath through pipelines. A temperature sensor is arranged inside the cooling spacing control tube. Constant temperature water circulates between the cooling spacing control tube and the interior of the constant temperature water bath. The upper and lower ends of the cooling spacing control tube are respectively provided with a water inlet and a water outlet. The upper and lower positions of the water inlet and the water outlet are opposite to the upper and lower positions of the oil inlet and the oil outlet. The voltage field strength of the experimental outer tube is adjusted and controlled according to the high voltage and electric field control spacing of the metal casing. A temperature sensor is arranged inside the experimental outer tube. The voltage field strength is 1000-3000V / mm. The water cooling circulation effect of the upper and lower ends of the cooling spacing control tube is connected and conducted, thereby realizing the continuous automatic cooling of the crude oil inside the experimental device by constant temperature water, realizing the controllable variables, and ensuring the experimental effect of the crude oil inside the high voltage electric field.

[0010] The control temperature of the crude oil heating tank is 15-40°C. The crude oil in the crude oil heating tank is input into the interior of the experimental outer tube through the crude oil delivery pump. The experiment is carried out after the thermometer inside the experimental outer tube reaches the experimental temperature. The duration of the experiment is 1-60 minutes. The oil inlet is connected to the crude oil delivery by the crude oil delivery pump, and the outer end of the oil outlet is connected to the interior of the oil storage tank.

[0011] Beneficial effects:

[0012] The original experimental device, which simply carried out high-voltage electric field reaction inside the experimental tube, was improved into an experimental device with a cooling spacing control tube inside. The constant temperature water circulated inside the cooling spacing control tube can control the stability of the crude oil inside the experimental device, thereby ensuring the stable effect of the crude oil experiment. In addition, by replacing cooling spacing control tubes with different outer diameters, the electric field control spacing can be adjusted, so that a greater high-voltage field strength effect can be obtained under limited voltage conditions, which is convenient for the adjustment of the experimental equipment, can control various variables, and ensure the accuracy and stability of the experimental device.

[0013] By embedding a metal sleeve in the middle of the experimental outer tube, the cooling spacing control tube can be conveniently installed through the sealing connection flanges at the upper and lower ends, and the outer parts of the upper and lower ends of the metal sleeve are used to set the oil inlet and outlet, ensuring the overall installation and preventing interference in the overall process.

[0014] By replacing cooling spacing control tubes with different outer diameters, not only can automatic temperature control be achieved through circulating constant temperature water, but also the electric field control spacing can be adjusted, ensuring the field intensity regulation of most values, improving the adjustable range of the experimental device, adding more experimental variables, and ensuring the final experimental accuracy.

[0015] By controlling the water cooling circulation effect of the upper and lower ends of the cooling spacing control tube, the constant temperature water is used to continuously and automatically cool the crude oil inside the experimental device, thus achieving variable control and ensuring the experimental effect of the crude oil inside the high-voltage electric field. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the working process of an automatic temperature-controlled high-voltage electric field crude oil viscosity reduction experimental device;

[0017] In the figure; 1. experimental outer tube, 2. metal casing, 3. cooling distance control tube, 4. oil inlet, 5. oil outlet, 6. water inlet, 7. water outlet, 8. ground wire, 9. crude oil delivery pump, 10. oil storage tank, 11. constant temperature water bath, 12. high voltage power supply, 13. crude oil heating storage tank, 14. temperature sensor. DETAILED DESCRIPTION

[0018] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0019] Experimental outer tube 1, metal casing 2, cooling distance control tube 3, oil inlet 4, oil outlet 5, water inlet 6, water outlet 7, ground wire 8, crude oil delivery pump 9, oil storage tank 10, constant temperature water bath 11, high voltage power supply 12, crude oil heating storage tank 13, temperature sensor 14.

[0020] like Figure 1 As shown;

[0021] An automatic temperature-controlled high-voltage electric field crude oil viscosity reduction experimental device, the experimental device includes a crude oil preheating and conveying system, an electric field internal temperature adjustment control system and an electric field voltage adjustment system, characterized in that the crude oil preheating and conveying system includes a crude oil heating storage tank 13 and a crude oil delivery pump 9, the electric field internal temperature adjustment control system includes a constant temperature water bath 11 and a cooling spacing control tube 3, the electric field voltage adjustment system includes a high-voltage power supply 12, a power supply voltage regulator and an experimental tank body, the experimental tank body is provided with a cooling spacing control tube 3 and an experimental outer tube 1 in a nested manner inside and outside, the cooling spacing control tube 3 and the experimental outer tube 1 are nested inside and outside and aligned with each other's axial centers, and the upper and lower ends of the cooling spacing control tube 3 and the experimental outer tube 1 are sealed by flange surfaces. The material of the experimental outer tube 1 is an insulating material, a metal sleeve 2 is embedded in the middle inner side of the experimental outer tube 1, a cooling distance control tube 3 is vertically inserted in the inner center of the experimental outer tube 1, crude oil is arranged between the experimental outer tube 1 and the cooling distance control tube 3, the material of the cooling distance control tube 3 is a metal steel pipe, a water inlet 6 and a water outlet 7 are arranged in the bottom flange and the upper flange center of the cooling distance control tube 3, the upper and lower ends of the cooling distance control tube 3 are connected to the inside of the experimental outer tube 1 through flange replacement, the distance between the outer wall of the cooling distance control tube 3 and the inner wall of the experimental outer tube 1 is an electric field control distance, the interior of the cooling distance control tube 3 is provided with constant temperature water in a constant temperature water bath 11, the metal of the experimental outer tube 1 The upper and lower sides of the sleeve 2 are respectively provided with an oil outlet 5 and an oil inlet 4. The metal sleeve 2 is connected to the high-voltage power supply 12 through a power supply voltage regulator. The shape of the experimental outer tube 1 is a vertical upper and lower conductive circular tube. The upper and lower ends of the experimental outer tube 1 are provided with sealing connection flanges. The cooling spacing control tube 3 inside the experimental outer tube 1 is fixedly connected through the sealing connection flange. The bottom outer side of the experimental outer tube 1 is provided with a ground wire 8. The upper and lower surfaces of the experimental outer tube 1 are respectively penetrated with an oil outlet 5 and an oil inlet 4. The inner side of the middle tube wall of the experimental outer tube 1 is annularly embedded with a metal sleeve 2. A section of the metal sleeve 2 embedded inside the experimental outer tube 1 is the positive electrode of the high-voltage electric field. A welded protruding section of the metal sleeve 2 is provided with a terminal. The main wiring through The over-insulated outer tube is connected to an AC power supply or a DC power supply, a grounding terminal is welded to the metal inner tube, and the grounding terminal is connected to a grounding wire 8. A circular electric field is formed between the metal sleeve 2 and the cooling spacing control tube 3. The maximum output voltage of the AC power supply or the DC power supply is 30,000 or 60,000 V. Assembly flanges are provided at both ends of the cooling spacing control tube 3. The centers of the assembly flanges at both ends of the cooling spacing control tube 3 are provided with flow guide interfaces through the cooling spacing control tube 3. The length of the cooling spacing control tube 3 is the same as that of the experimental outer tube 1. The outer diameter of the cooling spacing control tube 3 is smaller than the inner diameter of the experimental outer tube 1. The electric field control spacing between the outer wall of the cooling spacing control tube 3 and the inner wall of the experimental outer tube 1 is achieved by replacing cooling spacing control tubes 3 with different outer diameters.The electric field control spacing is 10mm, 15mm, 20mm and 25mm, etc. The upper and lower ends of the cooling spacing control tube 3 are connected to the constant temperature water bath 11 through pipelines. A temperature sensor 14 is arranged inside the cooling spacing control tube 3. Constant temperature water circulates between the cooling spacing control tube 3 and the interior of the constant temperature water bath 11. The upper and lower ends of the cooling spacing control tube 3 are respectively provided with a water inlet 6 and a water outlet 7. The upper and lower positions of the water inlet 6 and the water outlet 7 are opposite to the upper and lower positions of the oil inlet 4 and the oil outlet 5. The voltage field strength of the experimental outer tube 1 is determined according to the metal casing. 2 is regulated and controlled by the high voltage and electric field control spacing. A temperature sensor 14 is provided inside the experimental outer tube 1. The voltage field strength is 1000-3000V / mm. The control temperature of the crude oil heating tank 13 is 15-40℃. The crude oil in the crude oil heating tank 13 is input into the experimental outer tube 1 through the crude oil delivery pump 9. The experiment is carried out after the thermometer inside the experimental outer tube 1 reaches the experimental temperature. The duration of the experiment is 1-60 minutes. The oil inlet 4 is connected to the crude oil delivery pump 9. The outer end of the oil outlet 5 is connected to the inside of the oil storage tank 10.

[0022] Implementation examples;

[0023] Before use, select the appropriate cooling spacing control tube 3 according to the actual available voltage strength and the required voltage field strength in the experimental environment to adjust the electric field control spacing, so as to adjust the required voltage field strength effect according to different needs. The crude oil heating tank 13 preheats the crude oil required for the experiment.

[0024] In actual use, the constant temperature water inside the cooling spacing control tube 3 is first circulated through the water inlet 6 and the water outlet 7. After ensuring the temperature of the cooling spacing control tube 3, crude oil is poured from the crude oil heating storage tank 13 through the crude oil delivery pump 9 from the oil inlet 4. The crude oil is fully filled between the experimental outer tube 1 and the cooling spacing tube. The crude oil is discharged through the high voltage of the metal casing 2, thereby realizing the modification of the crude oil wax, thereby reducing the viscosity of the crude oil. In this process, the crude oil is heated by the high pressure of the metal casing 2. At this time, the temperature of the crude oil is continuously controlled by the external circulation of constant temperature water through the cooling circulation control tube, thereby achieving a high-pressure experimental effect of stable crude oil temperature.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic temperature-controlled high-voltage electric field crude oil viscosity reduction experimental device, the experimental device includes a crude oil preheating and transportation system, an electric field internal temperature adjustment control system and an electric field voltage adjustment system, characterized in that: The crude oil preheating and delivery system includes a crude oil heating storage tank and a crude oil delivery pump, the electric field internal temperature adjustment control system includes a constant temperature water bath and a cooling spacing control tube, the electric field voltage regulation system includes a high-voltage power supply, a power supply voltage regulator and an experimental tank body, the experimental tank body is nested inside and outside with a cooling spacing control tube and an experimental outer tube, the inner and outer nesting of the experimental outer tube and the inner and outer nesting of the experimental outer tube are mutually axially aligned, the upper and lower ends of the cooling spacing control tube and the experimental outer tube are connected by flange surface sealing, the material of the experimental outer tube is insulating material, the inner side of the middle part of the experimental outer tube is embedded with a metal sleeve, and the inner center of the experimental outer tube is vertically inserted There is a cooling spacing control tube, crude oil is arranged between the experimental outer tube and the cooling spacing control tube, the cooling spacing control tube is made of a metal steel tube, a water inlet and a water outlet are arranged at the bottom flange and the center of the upper flange of the cooling spacing control tube, the upper and lower ends of the cooling spacing control tube are connected to the inside of the experimental outer tube by flange replacement, the distance between the outer wall of the cooling spacing control tube and the inner wall of the experimental outer tube is an electric field controlled distance, the inside of the cooling spacing control tube is provided with constant temperature water in a constant temperature water bath, the upper and lower sides of the metal casing of the experimental outer tube are respectively provided with an oil outlet and an oil inlet, and the metal casing is connected to the high voltage power supply through a power supply voltage regulator.

2. The automatic temperature-controlled high-voltage electric field crude oil viscosity reduction experimental device according to claim 1 is characterized in that: The experimental outer tube is in the shape of a vertical upper and lower conducting circular tube. Sealed connecting flanges are provided at both ends of the experimental outer tube. The cooling spacing control tube inside the experimental outer tube is fixedly connected through the sealed connecting flange. A ground wire is provided on the outside of the bottom of the experimental outer tube. The upper and lower surfaces of the experimental outer tube are respectively provided with oil outlets and oil inlets. A metal sleeve is provided in an annular manner on the inner side of the middle tube wall of the experimental outer tube.

3. The automatic temperature control high voltage electric field crude oil viscosity reduction experimental device according to claim 1 is characterized in that: A section of metal casing is embedded inside the experimental outer tube as the positive electrode of the high-voltage electric field. A welded protruding section of the metal casing is provided with a terminal. The terminal passes through the insulating outer tube and is connected to the AC power supply or the DC power supply. A grounding terminal is welded to the metal inner tube, and the grounding terminal is connected to the grounding wire. A circular electric field is formed between the metal casing and the cooling spacing control tube. The maximum output voltage of the AC power supply or the DC power supply is 30,000 or 60,000V.

4. The automatic temperature control high voltage electric field crude oil viscosity reduction experimental device according to claim 1 is characterized in that: The cooling spacing control tube is provided with assembly flanges at both ends, and the centers of the assembly flanges at both ends of the cooling spacing control tube are provided with flow guide interfaces. The length of the cooling spacing control tube is the same as the length of the experimental outer tube, and the outer diameter of the cooling spacing control tube is smaller than the inner diameter of the experimental outer tube. The electric field control spacing between the outer wall of the cooling spacing control tube and the inner wall of the experimental outer tube is achieved by replacing cooling spacing control tubes with different outer diameters. The electric field control spacing is 10mm, 15mm, 20mm and 25mm, etc.

5. The automatic temperature-controlled high-voltage electric field crude oil viscosity reduction experimental device according to claim 1 is characterized in that: The upper and lower ends of the cooling spacing control tube are connected to the constant temperature water bath through pipelines. A temperature sensor is provided inside the cooling spacing control tube. Constant temperature water circulates between the cooling spacing control tube and the interior of the constant temperature water bath. The upper and lower ends of the cooling spacing control tube are respectively provided with a water inlet and a water outlet. The upper and lower positions of the water inlet and the water outlet are opposite to the upper and lower positions of the oil inlet and the oil outlet.

6. The automatic temperature-controlled high-voltage electric field crude oil viscosity reduction experimental device according to claim 1 is characterized in that: The voltage field strength of the experimental outer tube is adjusted and controlled according to the high voltage of the metal casing and the electric field control spacing. A temperature sensor is provided inside the experimental outer tube. The voltage field strength is 1000-3000V / mm.

7. The automatic temperature-controlled high-voltage electric field crude oil viscosity reduction experimental device according to claim 6 is characterized in that: The control temperature of the crude oil heating tank is 15-40°C. The crude oil in the crude oil heating tank is input into the interior of the experimental outer tube through the crude oil delivery pump. The experiment is carried out after the thermometer inside the experimental outer tube reaches the experimental temperature. The duration of the experiment is 1-60 minutes.

8. The automatic temperature-controlled high-voltage electric field crude oil viscosity reduction experimental device according to claim 1 is characterized in that: The oil inlet is connected to the crude oil delivery via a crude oil delivery pump, and the outer end of the oil outlet is communicated with the interior of the oil storage tank.

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