Crude oil high-voltage electric field modification skid-mounted equipment

Abstract

The skid-mounted equipment is externally provided with a feeding pipe and a discharging pipe, an electric appliance control system, a crude oil circulation preheating system, a crude oil modification unit and a treated crude oil recovery tank are arranged in the skid-mounted equipment, and the electric appliance control system comprises a high-voltage power source and a power source control cabinet. The crude oil circulation preheating system comprises a heating stirring tank, a crude oil pump and a temperature control display, the crude oil modification unit comprises a unit groove, a plurality of modification electric field structure units and a water phase countercurrent constant-temperature circulation device, and the plurality of modification electric field structure units are combined into the crude oil modification unit, so that efficient integrated skid-mounted equipment is realized; the crude oil to be modified can be heated through the heating and stirring tank to meet the modification effect, so that the crude oil modification operation can be conveniently carried out at all positions only through the skid-mounted equipment, and the effects of convenience, simplicity, high adaptability and capability of fully meeting the viscosity reduction and modification of the crude oil are achieved.

Description

Technical Field

[0001] This article belongs to the technical field of high-voltage electric field crude oil modification, specifically involving a skid-mounted device for high-voltage electric field modification of crude oil. Background Technology

[0002] The extraction and transportation of high-viscosity heavy crude oil face significant technical limitations. Due to the high content of paraffin, gums, and asphaltenes in high-viscosity crude oil, its fluidity is poor. Generally, physical or chemical methods are needed to upgrade or modify these oils to reduce viscosity and improve fluidity. Currently, the main viscosity reduction methods used in oilfields during extraction and gathering include: heated transportation processes, chemical agent-added viscosity reduction processes, blending with thinner oil, and modified viscosity reduction processes. In addition, some methods are under development and being explored, such as microbial viscosity reduction, ultrasonic viscosity reduction, microwave viscosity reduction, and electric field viscosity reduction.

[0003] Among existing technologies, electric field modification for viscosity reduction is a relatively cutting-edge and novel technique. Simply put, electric field modification involves applying a high-voltage electric field of a certain intensity to crude oil for a duration of several seconds, which can 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 to achieve the same viscosity reduction rate. This method was first proposed in 2006, received support from various parties, and small-scale field tests were conducted.

[0004] Electric field treatment is highly effective in weakening the gelling structure of waxy crude oil, which is beneficial to improving the safety of pipeline restart after shutdown. Electric field treatment is efficient and energy-saving; to achieve the same viscosity reduction effect, the energy consumption required is only 1% of that of heating methods. The composition of the modified crude oil remains unchanged, without affecting subsequent refining processes. The viscosity of electric field-modified crude oil gradually increases with the duration of electric field treatment, and the viscosity reduction effect can last for about one day, while the modification effect of gelled crude oil lasts much longer. The modification effect and stability vary greatly among different crude oils. The electric field modification technology is not yet mature, mainly because the modification effect varies greatly among different crude oils, and the stability of the modification effect needs further improvement. Although the interface polarization theory can qualitatively explain the observed crude oil electrorheological behavior, it still cannot quantitatively explain the significant differences in the electric field modification effect among different crude oils.

[0005] Therefore, a high-voltage electric field improvement device that can be easily skid-mounted is needed. Through the electric field viscosity reduction device, the viscosity of crude oil can be effectively and efficiently reduced by the electric field. Utility Model Content

[0006] To address the aforementioned issues, this paper proposes a skid-mounted device for high-voltage electric field modification of crude oil. The skid-mounted device has an external inlet pipe and an external outlet pipe. Internally, it houses an electrical control system, a crude oil circulation preheating system, a crude oil modification unit, and a crude oil recovery tank. The electrical control system includes a high-voltage power supply and a power control cabinet. The crude oil circulation preheating system includes a heating and stirring tank, a crude oil pump, and a temperature control display. The heating and stirring tank has an input type connected to the inlet pipe and an output type connected to the crude oil modification unit via the crude oil pump. The crude oil modification unit has an output type connected to the crude oil recovery tank and a conductive type connected to the high-voltage power supply via the power control cabinet. The crude oil modification unit includes a unit tank, a modified electric field structure unit, and a water-phase countercurrent constant-temperature circulation device. The unit tank is a square sealed oil bath constant-temperature tank. Multiple sets of tubular modified electric field structure units are connected in parallel or series within the unit tank. The unit consists of an insulating outer tube with a mid-section embedded metal sleeve and a thermostatically controlled inner tube made of metal. The insulating outer tube and the thermostatically controlled inner tube are nested and connected. The upper and lower ends of the insulating outer tube and the thermostatically controlled inner tube are sealed by flanges to form a set of electric field mechanism units. In the electric field structure unit, the modified crude oil flows between the insulating outer tube and the thermostatically controlled inner tube. The water phase countercurrent thermostatic circulation device transports the water phase countercurrently to the inside of the thermostatically controlled inner tube through the inside of the thermostatically controlled inner tube in the electric field mechanism unit and the thermostatic water bath, and circulates it at a constant temperature. By combining several modified electric field structure units into a crude oil modification unit, a highly efficient integrated skid-mounted equipment is realized. It can also heat the crude oil to be modified through a heating and stirring tank to meet the modification effect. Thus, crude oil modification can be easily carried out at various locations using only skid-mounted equipment, making it convenient, simple, highly adaptable, and able to fully meet the effect of crude oil viscosity reduction modification.

[0007] The skid-mounted equipment is an integrated unit. The bottom of the skid-mounted equipment is equipped with a tooling base. The upper surface of the tooling base is fixedly installed with an electrical control system, a crude oil circulation preheating system, a crude oil modification unit, and a crude oil recovery tank. Through the integrated skid-mounted equipment, all internal components can be integrated together, which can be easily integrated and used, and facilitates connection between various oil pipelines.

[0008] The power control cabinet is an external high-voltage receiving and rectifying cabinet. The high-voltage power supply includes AC power, AC / DC power, intelligent power and high-frequency power, etc. The power control cabinet is connected to the crude oil circulation preheating system, crude oil modification unit and crude oil recovery tank through cable connection. Through the electrical control system, it can not only provide power to the high-voltage modification components through high voltage, but also provide low-voltage power to other equipment. It achieves unified management of the whole, ensuring the integrity and convenience of the equipment.

[0009] The heating and stirring tank is a vertically oriented tank. A circulation interface is located at the top of the tank, which connects to the internal preheating circulation of the modified electric field structure unit. A temperature control display is located on the outside of the tank. A vertically rotating stirring rod is located inside, and heating wires are installed on the inner wall. The heating temperature ranges from 35 to 250 degrees Celsius. This heating and stirring tank provides basic heating of the initial crude oil and preheats the modified electric field structure unit via the circulation interface, ensuring sufficient crude oil temperature for subsequent high-pressure modification and improving its effectiveness.

[0010] The system comprises a nested inner and outer insulating tube for temperature control, with the inner and outer tubes aligned axially. The upper and lower ends of the inner and outer tubes are sealed together via flanges. The outer tube is made of insulating material, and a metal sleeve is embedded in its inner middle section. The inner tube is vertically inserted into the center of the outer tube, with crude oil placed between them. The inner tube is made of steel, and has an inlet and outlet at the center of its bottom and upper flanges. The upper and lower ends of the inner tube are interchangeably connected to the inner part of the outer tube via flanges. The distance between the outer wall of the tube and the inner wall of the insulating outer tube is a distance controlled by an electric field. The inner tube is equipped with a constant temperature water bath. The upper and lower sides of the metal sleeve of the insulating outer tube are respectively provided with an oil outlet and an oil inlet. The metal sleeve is connected to a high-voltage power supply through a power control cabinet. The original modification device, which was simply a device that carried out a high-voltage electric field reaction inside, has been improved into a device with a constant temperature control inner tube. By circulating constant temperature water inside the constant temperature control inner tube, the stability of the crude oil inside the experimental device can be controlled, ensuring the stability of the crude oil. By connecting the upper and lower ends of the constant temperature control inner tube with water cooling circulation, the continuous and automated cooling of the crude oil inside the experimental device by constant temperature water is achieved.

[0011] The crude oil recovery tank is a vertical oil storage tank. The inlet of the crude oil recovery tank is connected to the high-pressure modification component, and the outlet of the crude oil recovery tank is connected to the discharge pipe.

[0012] The outer side of the unit tank is connected to the oil bath constant temperature circulation device in a circulating manner. The inside of the unit tank is equipped with constant temperature insulating oil. The constant temperature insulating oil is equipped with a modified electric field structure unit in a suspended and sealed manner. By circulating the oil bath constant temperature circulation device on the outside of the unit tank, not only can the outside of the modified electric field structure unit be kept at a constant temperature, but also the insulation effect of the oil bath can be achieved, ensuring safety from high voltage electric field hazards.

[0013] Beneficial effects:

[0014] By combining several modified electric field structure units into a crude oil modification unit, a highly efficient integrated skid-mounted device is achieved. It can also heat the crude oil to be modified through a heated mixing tank to meet the modification effect. This allows crude oil modification operations to be conveniently carried out at various locations using only skid-mounted equipment, making it convenient, simple, highly adaptable, and able to fully meet the requirements of crude oil viscosity reduction modification.

[0015] The integrated skid-mounted equipment allows all internal components to be integrated together, making it easy to use and connect between various oil pipelines.

[0016] The electrical control system can not only supply power to the high-voltage modified components through high voltage, but also supply low voltage power to other equipment, thus achieving unified management of the entire system and ensuring the integrity and convenience of the equipment.

[0017] The initial crude oil can be preheated by heating the stirring tank, and the modified electric field structure unit can be preheated by circulating the interface to meet the required crude oil temperature, which facilitates subsequent high-pressure modification and improves the effect of high-pressure modification.

[0018] The original modification device, which simply carried out a high-voltage electric field reaction inside, was improved into a device with an internal thermostatic control tube. By circulating constant-temperature water inside the thermostatic control tube, the stability of the crude oil inside the experimental device can be controlled, ensuring the stability of the crude oil. Through the water cooling circulation effect connected at both ends of the thermostatic control tube, the continuous and automated cooling of the crude oil inside the experimental device by constant-temperature water is achieved.

[0019] By installing an oil bath constant temperature circulation device on the outside of the unit tank, it is possible not only to achieve constant temperature treatment on the outside of the modified electric field structure unit, but also to achieve the insulation effect of the oil bath, thus ensuring safety under high voltage electric field. Attached Figure Description

[0020] Figure 1 This is a process diagram of a skid-mounted equipment for modifying crude oil using a high-voltage electric field.

[0021] Figure 2 This is a schematic diagram of a modified electric field structure unit for a crude oil high-voltage electric field modification skid-mounted equipment;

[0022] In the diagram: 1. Feed pipe, 2. Heating and stirring tank, 3. Crude oil pump, 4. Crude oil modification unit, 5. Electrical control system, 6. Crude oil recovery tank, 7. Discharge pipe, 8. Modified electric field structure unit, 9. Water phase countercurrent constant temperature circulation device, 10. Oil bath constant temperature circulation device, 11. Insulating outer pipe, 12. Constant temperature control inner pipe, 13. Metal sleeve. Detailed Implementation

[0023] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0024] 1. Feed pipe, 2. Heating and stirring tank, 3. Crude oil pump, 4. Crude oil modification unit, 5. Electrical control system, 6. Crude oil recovery tank, 7. Discharge pipe, 8. Modified electric field structure unit, 9. Water phase countercurrent constant temperature circulation device, 10. Oil bath constant temperature circulation device, 11. Insulating outer pipe, 12. Constant temperature control inner pipe, 13. Metal sleeve.

[0025] like Figure 1 As shown;

[0026] A skid-mounted device for high-voltage electric field modification of crude oil is disclosed. The skid-mounted device has an external inlet pipe 1 and an outlet pipe 7. Internally, it includes an electrical control system 5, a crude oil circulation preheating system, a crude oil modification unit 4, and a crude oil recovery tank 6. The electrical control system 5 includes a high-voltage power supply and a power control cabinet. The crude oil circulation preheating system includes a heating and stirring tank 2, a crude oil pump 3, and a temperature control display. The heating and stirring tank 2 is connected to the inlet pipe 1 via an input connection. The heating and stirring tank 2 is connected to the crude oil modification unit 4 via the crude oil pump 3. The crude oil modification unit 4 is connected to the crude oil recovery tank 6 via an output connection. The crude oil modification unit 4 is connected to the high-voltage power supply via the power control cabinet. The crude oil modification unit 4 includes a unit tank and a modified electric field structure. Unit 8, Water Phase Countercurrent Constant Temperature Circulation Device 9, wherein the unit tank is a square sealed oil bath constant temperature tank. Multiple sets of tubular modified electric field structure units 8 are arranged in parallel or series inside the unit tank. Each electric field structure unit consists of an insulating outer tube 11 of a mid-section embedded metal sleeve 13 and a metal constant temperature control inner tube 12. The insulating outer tube 11 and the constant temperature control inner tube 12 are nested together. The upper and lower ends of the insulating outer tube 11 and the constant temperature control inner tube 12 are sealed by flanges to form an electric field mechanism unit. Modified crude oil flows between the insulating outer tube 11 and the constant temperature control inner tube 12 in the electric field structure unit. The water phase countercurrent constant temperature circulation device 9 circulates water through the interior of the constant temperature control inner tube 12 in the electric field mechanism unit and the constant temperature water bath. The oil is transported in a counter-current manner to the interior of the constant-temperature control inner tube 12 and circulated at a constant temperature. The skid-mounted equipment is an integrated unit. The bottom of the skid-mounted equipment is equipped with a tooling base. The upper surface of the tooling base is fixedly mounted with an electrical control system, a crude oil circulation preheating system, a crude oil modification unit 4, and a crude oil recovery tank 6. The power control cabinet is an external high-voltage receiving and rectifying cabinet. The high-voltage power supply includes AC power, AC / DC power, intelligent power, and high-frequency power, etc. The power control cabinet is connected to the crude oil circulation preheating system, the crude oil modification unit 4, and the crude oil recovery tank 6 via cable connections. The heating and stirring tank 2 is a vertical stirring tank. The top of the heating and stirring tank 2 is equipped with a circulation interface. The heating and stirring tank 2 is connected to the modified electric field structure unit through the circulation interface. The internal preheating circulation of component 8 is continuous. A temperature control display is located on the outside of the heating and stirring tank 2. A vertically rotating stirring rod is located inside the heating and stirring tank 2. Heating wires are installed on the inner wall of the heating and stirring tank 2. The heating temperature of the heating and stirring tank 2 is 35-250 degrees Celsius. An inner thermostatic control tube 12 and an outer thermostatic control tube 11 are nested within each other, with their axes aligned. The upper and lower ends of the inner thermostatic control tube 12 and the outer thermostatic control tube 11 are sealed together by flanges. The outer thermostatic control tube 11 is made of insulating material. A metal sleeve 13 is embedded in the inner side of the middle of the outer thermostatic control tube 11. The inner thermostatic control tube 12 is vertically inserted into the center of the inner thermostatic control tube 11.A crude oil is disposed between the insulating outer tube 11 and the thermostatic control inner tube 12. The thermostatic control inner tube 12 is made of metal steel pipe. The bottom flange and the upper flange of the thermostatic control inner tube 12 have an inlet and an outlet at their centers. The upper and lower ends of the thermostatic control inner tube 12 are interchangeably connected to the interior of the insulating outer tube 11 via flanges. The distance between the outer wall of the thermostatic control inner tube 12 and the inner wall of the insulating outer tube 11 is a distance controlled by an electric field. The interior of the thermostatic control inner tube 12 contains thermostatic water in a thermostatic water bath. The metal of the insulating outer tube 11... The sleeve 13 has an oil outlet and an oil inlet on its upper and lower sides, respectively. The metal sleeve 13 is connected to a high-voltage power supply via a power control cabinet. The crude oil recovery tank 6 is a vertical oil storage tank. The inlet of the crude oil recovery tank 6 is connected to the high-voltage modification component, and the outlet of the crude oil recovery tank 6 is connected to the discharge pipe 7. The outer side of the unit tank is connected to the oil bath constant-temperature circulation device 10 in a circulating manner. The inside of the unit tank contains constant-temperature insulating oil, and the constant-temperature insulating oil is internally suspended and sealed with a modified electric field structure unit 8.

[0027] Implementation example;

[0028] Before use, the skid-mounted equipment should be installed between the crude oil pipeline with the feed pipe 1 and the discharge pipe 7 respectively, and the electrical control system 5 should be connected to the power supply.

[0029] In use, crude oil is fed into the heating and stirring tank 2 through the feed pipe 1, where it is heated and stirred to meet the modification temperature requirements for crude oils with different properties. Then, the heated crude oil is preheated and circulated within the crude oil modification unit through the crude oil pump 3 and circulation interface to ensure its effectiveness during normal use. Afterward, it is pumped into the crude oil modification unit 4 through the crude oil pump 3, where it undergoes viscosity reduction modification through a high-voltage electric field within the modification electric field structure unit 8. Simultaneously, the crude oil is kept at a constant temperature through the constant temperature control inner pipe 11, and the outer surface of the modification electric field structure unit 8 is kept at a constant temperature through the oil bath constant temperature circulation device 10 to ensure the effectiveness of the electric field production. After the modification and viscosity reduction are completed, the crude oil is then transported into the processed crude oil recovery tank 6 to maintain its stability before being discharged through the discharge pipe 7, thus completing the modification process.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A skid-mounted device for high-voltage electric field modification of crude oil, wherein the skid-mounted device is externally equipped with an inlet pipe and an outlet pipe, characterized in that, The skid-mounted equipment is equipped with an electrical control system, a crude oil circulation preheating system, a crude oil modification unit, and a crude oil recovery tank. The electrical control system includes a high-voltage power supply and a power control cabinet. The crude oil circulation preheating system includes a heating and stirring tank, a crude oil pump, and a temperature control display. The heating and stirring tank has an input type connected to the feed pipe and is connected to the crude oil modification unit input via the crude oil pump. The crude oil modification unit has an output type connected to the crude oil recovery tank and a conductive type connected to the high-voltage power supply via the power control cabinet. The crude oil modification unit includes a unit tank, a modification electric field structure unit, and a water phase countercurrent constant temperature circulation device. The unit tank is square. The structure of the sealed oil bath constant temperature bath includes multiple sets of tubular modified electric field structure units connected in parallel or series inside the unit tank. Each electric field structure unit consists of an insulating outer tube with a middle section embedded metal sleeve and a metal constant temperature control inner tube. The insulating outer tube and the constant temperature control inner tube are nested together and connected. The upper and lower ends of the insulating outer tube and the constant temperature control inner tube are sealed by flanges to form a set of electric field mechanism units. Modified crude oil flows between the insulating outer tube and the constant temperature control inner tube in the electric field structure unit. The water phase countercurrent constant temperature circulation device transports the water phase countercurrently to the inside of the constant temperature control inner tube through the inside of the constant temperature control inner tube in the electric field mechanism unit and the constant temperature water bath, and circulates it at a constant temperature.

2. The skid-mounted equipment for high-voltage electric field modification of crude oil according to claim 1, characterized in that, The skid-mounted equipment is an integrated unit. The bottom of the skid-mounted equipment is equipped with a tooling base. The upper surface of the tooling base is fixedly equipped with an electrical control system, a crude oil circulation preheating system, a crude oil modification unit, and a crude oil recovery tank.

3. The skid-mounted equipment for high-voltage electric field modification of crude oil according to claim 1, characterized in that, The power control cabinet is an external high-voltage receiving and rectifying cabinet. The high-voltage power supply includes AC power, AC / DC power, intelligent power and high-frequency power. The power control cabinet is connected to the crude oil circulation preheating system, crude oil modification unit and crude oil recovery tank respectively through cable connection.

4. The skid-mounted equipment for high-voltage electric field modification of crude oil according to claim 1, characterized in that, The heating and stirring tank is a vertical stirring tank. The top of the heating and stirring tank is equipped with a circulation interface. The heating and stirring tank is connected to the internal preheating circulation of the modified electric field structure unit through the circulation interface. The outside of the heating and stirring tank is equipped with a temperature control display. The inside of the heating and stirring tank is equipped with a vertically rotating stirring rod. The inner wall of the heating and stirring tank is equipped with heating wires. The heating temperature of the heating and stirring tank is 35-250 degrees Celsius.

5. The skid-mounted equipment for high-voltage electric field modification of crude oil according to claim 1, characterized in that, The aforementioned insulating outer tube is nested with a thermostatic control inner tube and an insulating outer tube, which are axially aligned. The upper and lower ends of the thermostatic control inner tube and the insulating outer tube are sealed together by flanges. The insulating outer tube is made of insulating material, and a metal sleeve is embedded in the inner middle of the insulating outer tube. The thermostatic control inner tube is vertically inserted into the center of the insulating outer tube. Oil is provided between the insulating outer tube and the thermostatic control inner tube. The thermostatic control inner tube is made of metal steel pipe, and its bottom flange and upper flange have an inlet and an outlet. The upper and lower ends of the thermostatic control inner tube are interchangeably connected to the interior of the insulating outer tube by flanges. The distance between the outer wall of the thermostatic control inner tube and the inner wall of the insulating outer tube is controlled by an electric field. The interior of the thermostatic control inner tube contains thermostatic water in a thermostatic water bath. The upper and lower sides of the metal sleeve of the insulating outer tube have oil outlets and oil inlets, respectively. The metal sleeve is connected to a high-voltage power supply through a power control cabinet.

6. The skid-mounted equipment for high-voltage electric field modification of crude oil according to claim 1, characterized in that, The crude oil recovery tank is a vertical oil storage tank. The inlet of the crude oil recovery tank is connected to the high-pressure modification component, and the outlet of the crude oil recovery tank is connected to the discharge pipe.

7. The skid-mounted equipment for high-voltage electric field modification of crude oil according to claim 1, characterized in that, The outer side of the unit tank is connected to the oil bath constant temperature circulation device in a circulating manner. The inside of the unit tank is equipped with constant temperature insulating oil, and the inside of the constant temperature insulating oil is equipped with a modified electric field structure unit in a suspended sealed installation manner.

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