Three-phase separator cooperatively reinforced by multiple electric fields and magnetic fields

Abstract

The invention discloses a multi-electric field and magnetic field synergistically enhanced three-phase separator which comprises a tank body, a tubular distributor, a crude oil pipeline, a dosing pipeline, an oil outlet pipeline, a gas outlet pipeline, a power supply device and heating equipment (optional), a middle-low voltage bare electrode electric field demulsification system is arranged in a liquid phase layer in the separator; a quick-change electromagnetic field demulsification system and a quick-change solenoid demulsification system are arranged outside the separator; the existing thermochemical treatment process of crude oil is simplified, the generated multiple electric fields and magnetic fields can perform effective electric field demulsification and electrostatic coalescence dehydration on water-in-oil type and oil-in-water type crude oil emulsions in the tank, the chemical demulsification process in the electric fields can be enhanced, the standing time of conventional high-frequency pulsed electric field treatment of the crude oil is shortened, and the crude oil quality is improved. And closed, efficient and low-cost treatment of crude oil can be realized.

Description

Technical Field

[0001] The invention relates to a three-phase separation technology, in particular to a three-phase separator with multiple electric fields and magnetic fields synergistically enhanced. Background Art

[0002] At present, as the economy enters a stage of rapid development, the demand for energy continues to increase, and the exploitable life of oil and gas resources is getting shorter and shorter. It is urgent to find new alternative energy sources. As an alternative energy source to petroleum, oil shale has become the focus of world attention since its discovery.

[0003] Shale oil refers to the oil resources contained in shale formations (mainly shale), which mainly exist in rock pores, cracks, adjacent layers and interlayers. Shale oil has the characteristics of high freezing point, high wax content, high wax precipitation point, small droplet size in emulsion, and high emulsification degree. Therefore, shale oil produced fluid has problems such as demulsification and dehydration difficulties during the treatment process. In order to meet the needs of shale oil mine product measurement, mine processing, commercial crude oil quality requirements, crude oil storage and pipeline (or other transportation methods) transportation, the gas and liquid phases must be separated, and the crude oil and associated water in the liquid phase must be separated. Therefore, three-phase separation treatment has become the primary processing procedure for shale oil processing in mines.

[0004] Oil, gas and water have different physical and chemical properties, such as density and viscosity. The oil, gas and water three-phase separator uses a certain method (such as gravity sedimentation, centrifugal method, packing separation method, etc.) to make use of the different properties of the three phases to achieve a certain degree of separation of oil, gas and water. However, due to the different properties of the produced fluids in various oil fields, the degree of separation required for the three phases of oil, gas and water is also different. Therefore, domestic and foreign scholars and engineering and technical personnel continue to study, design and improve the oil, gas and water three-phase separator according to the requirements of production and mining environment, making it more reasonable, effective, economical and environmentally friendly.

[0005] Since 2017, Professor Chen Jiaqing's research group at Beijing Institute of Petrochemical Technology has been committed to the localization of the third-generation VIEC technology and products. After more than two years, on the basis of fully digesting and absorbing the third-generation VIEC electric field demulsification technology from abroad, the transformer non-built-in VIEC electrostatic agglomeration module was independently developed. The module consists of metal electrodes, insulating electrodes, stainless steel pipes and collection balls, and the insulating electrode plate is integrally molded by epoxy resin material. The technology was pilot-tested at the Zhuanxi 106 transfer station of Shengli Oilfield in January 2019. The water content at the inlet of the three-phase separator was 97.3%, the crude oil density was 0.932g / cm3, and the viscosity was 328mPa·s. The experimental results show that under the action of high-frequency / high-voltage pulsed AC electric field, the VIEC electric field demulsification technology can reduce the water content of oil well produced fluid with a water content of 97% to about 4% or even lower after electrostatic agglomeration and dehydration. The electric field demulsification effect is significant, which provides valuable experience for subsequent industrial field application experimental research.

[0006] In 2020, Liu Cunxin and others from Jinbiao Intelligent Technology Co., Ltd. proposed a new type of high-frequency electrostatic coalescer. When working, the high-water crude oil emulsion enters from the tangential inlet of the gas-liquid cyclone separator. After the internal cyclone centrifugation, the gas is discharged from the upper exhaust pipe, and the liquid flows into the electric field area from the lower part of the device. The crude oil emulsion is subjected to electric field demulsification by the first-level high-frequency coalescing device, so that the high-water crude oil emulsion can achieve the purpose of oil-water separation: the second-layer coalescing device in the device can effectively cut the bubbles, improve the transfer rate and utilization efficiency of oxygen, so that the organic matter in the water can be effectively treated. In the same year, Sun Longlong and others from Shengli Oilfield Longxi Petroleum Engineering Service Co., Ltd. designed a high-frequency coalescing device to address the problems of strong emulsification and difficult treatment of high-water crude oil production fluid. During the treatment process, the crude oil emulsion enters through the inlet and is evenly dispersed in the tank through the oil hole distributor, flows through the electric field area, and under the action of the electric field of the electrode grid, the oil and water phases are separated, and the oil phase is discharged from the tank through the oil outlet. Field test results show that after treatment, the water content of crude oil emulsion with a water content of more than 90% can be reduced to 5%, and the effect of electric field demulsification and pre-water separation is significant.

[0007] In summary, in the existing three-phase separation process of crude oil, the thermochemical process has high cost, long processing flow, and is difficult to seal, resulting in large oil and gas losses, prominent environmental problems, and it is difficult for the treated oil and water to meet the standard requirements. Objectively speaking, compared with chemical demulsification, thermochemical demulsification and other oil-water emulsion treatment methods, electric field demulsification has received great attention from domestic and foreign researchers in recent years due to its high treatment efficiency and no side effects. The electric field used by most of the three-phase separators in service is still the industrial frequency / high voltage AC electric field, and a large number of engineering operation results to date have shown that the industrial frequency electric dehydration equipment is prone to electrical breakdown, resulting in the destruction of the electric field and electrodes, and problems such as difficulty in powering on. At present, the conventional high-frequency pulse electric field equipment treats shale oil, and the residence time is more than twice that of conventional crude oil treatment. Therefore, there is an urgent need to improve the effectiveness of the electric field used in shale oil electric field separators.

[0008] In view of this, the present invention is proposed. Summary of the invention

[0009] The purpose of the present invention is to provide a three-phase separator with multiple electric fields and magnetic fields synergistically enhanced to solve the above-mentioned technical problems existing in the prior art.

[0010] The objective of the present invention is achieved through the following technical solutions:

[0011] The three-phase separator with multiple electric and magnetic field synergistic enhancement of the present invention comprises a separator tank body, one end of which is connected to a crude oil pipeline 3, a water injection pipeline 2 and a dosing pipeline 1, and the other end is connected to an oil outlet pipeline 15, the upper part is connected to an air outlet pipeline 14, and the lower part is connected to a drainage pipeline 17, and the side branch of the drainage pipeline 17 is connected to the separator tank body through a water pump and a mud and sand flushing water pipeline 16;

[0012] The separator tank is provided with a tubular distributor 7 connected to the crude oil pipeline 3, and the area from the tubular distributor 7 to the oil outlet pipeline 15 is the crude oil processing area;

[0013] The separator tank body is provided with a medium and low voltage bare electrode electric field demulsification system 8, and the separator tank body is provided with a fast-changing electromagnetic field demulsification system 12 and a fast-changing solenoid demulsification system 13;

[0014] The separator tank body is provided with a power supply device 10 and a power supply connection hub 11 for matching use.

[0015] Compared with the prior art, the three-phase separator with multiple electric fields and magnetic fields synergistically enhanced provided by the present invention simplifies the existing thermochemical treatment process of crude oil. The generated multiple electric fields and magnetic fields can effectively perform electric field demulsification and electrostatic agglomeration dehydration on oil-in-water and water-in-oil crude oil emulsions in the tank, and can enhance the chemical demulsification process in the electric field, shorten the residence time of conventional high-frequency pulse electric field treatment of crude oil, and realize closed, efficient and low-cost treatment of crude oil.

[0016] It is used to demulsify and dehydrate crude oil so that the treated crude oil meets the external transportation standards at the mine or meets the relevant requirements of the subsequent processing standards in the refinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a three-phase separator with multiple electric and magnetic field synergistic enhancement provided in Example 1 of the present invention (excluding the crude oil collection section);

[0018] Figure 2 A schematic diagram of the structure of a three-phase separator with multiple electric and magnetic field synergistic enhancement provided in Example 2 of the present invention (including a weir plate, an oil collection area, and a water collection section);

[0019] Figure 3 A schematic diagram of the structure of a simple electrode plate provided in an embodiment of the present invention;

[0020] Figure 4a , Figure 4b They are respectively schematic diagrams of the front view and top view of the structure of a single core provided by an embodiment of the present invention;

[0021] The symbols in the figure represent the following:

[0022] 1-dosing pipeline, 2-water injection pipeline, 3-crude oil pipeline, 4-heat exchanger, 5-static mixer, 6-mixing valve, 7-tubular distributor, 8-bare electrode of low-voltage bare electrode electric field demulsification system, 9-ground electrode, 10-power supply device, 11-power supply wiring hub, 12-fast-changing electromagnetic field demulsification system, 13-fast-changing solenoid demulsification system, 14-air outlet pipeline, 15-oil outlet pipeline, 16-mud and sand flushing water pipeline, 17-drainage pipeline, 18-mud and sand flushing pipeline junction;

[0023] 21-main separation chamber area, 22-oil collection area, 23-water collection area

[0024] 41- angle steel, 42- pole plate, 43- angle code. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0026] First, the terms that may be used in this article are explained as follows:

[0027] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0028] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0029] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0030] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0031] The contents not described in detail in the examples of the present invention belong to the prior art known to professionals in the field. If no specific conditions are specified in the examples of the present invention, the conditions are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used in the examples of the present invention, they are all conventional products that can be purchased commercially.

[0032] The three-phase separator with multiple electric and magnetic field synergistic enhancement of the present invention comprises a separator tank body, one end of which is connected to a crude oil pipeline 3, a water injection pipeline 2 and a dosing pipeline 1, and the other end is connected to an oil outlet pipeline 15, the upper part is connected to an air outlet pipeline 14, and the lower part is connected to a drainage pipeline 17, and the side branch of the drainage pipeline 17 is connected to the separator tank body through a water pump and a mud and sand flushing water pipeline 16;

[0033] The separator tank is provided with a tubular distributor 7 connected to the crude oil pipeline 3, and the area from the tubular distributor 7 to the oil outlet pipeline 15 is the crude oil processing area;

[0034] The separator tank body is provided with a medium and low voltage bare electrode electric field demulsification system 8, and the separator tank body is provided with a fast-changing electromagnetic field demulsification system 12 and a fast-changing solenoid demulsification system 13;

[0035] The separator tank body is provided with a power supply device 10 and a power supply connection hub 11 for matching use.

[0036] The bare electrodes of the medium and low voltage bare electrode electric field demulsification system 8 adopt a rectangular wave power supply mode, the power supply voltage is between 10V and 2kV, the pulse frequency is between 500Hz and 250kHz, and the power supply switching frequency is between 50Hz and 5kHz.

[0037] The fast-changing electromagnetic field crude oil demulsification system 12 comprises a plurality of annular iron cores, which are sleeved on the separator tank body, and each annular iron core is provided with a fast-changing excitation winding;

[0038] An insulating fixing bracket is arranged between the iron core and the separator tank body, and the excitation winding is pre-buried in the insulating fixing bracket.

[0039] The fast-changing excitation windings are all connected in parallel and powered by an excitation power supply device;

[0040] Alternatively, they are connected in groups in parallel, with each group powered by an excitation power supply device, and the waveforms generated by the multiple excitation power supplies must be consistent in phase.

[0041] The current change rate in the excitation winding is ≥10A / us; the voltage is between 50V and 5kV;

[0042] The excitation frequency of the excitation winding has three frequency adjustment ranges:

[0043] Frequency adjustment interval 1 is the normal frequency interval between 500Hz and 20kHz;

[0044] Frequency adjustment interval 2 is the ultra-high frequency interval between 20kHz and 250kHz;

[0045] Frequency adjustment interval 3 is a near-microwave frequency interval between 500kHz and 500MHz;

[0046] When exciting the field winding, various optimized composite frequencies are used, and the excitation voltage waveform is rectangular wave, AC square wave or agile frequency conversion;

[0047] The above adjustment methods are suitable for targeted demulsification of crude oils with different properties.

[0048] The fast-changing solenoid demulsification system 13 is a common high-temperature wire that is passed through an explosion-proof pipe and then wrapped around the separator tank.

[0049] The current change rate of the solenoid power supply of the fast-changing solenoid demulsification system 13 is ≥10A / us; the voltage is adjustable between 10V and 2kV;

[0050] The adjustment range of the solenoid power supply frequency is between 500Hz and 250kHz. The solenoid power supply frequency adopts the optimized composite of various frequencies. The solenoid power supply voltage waveform is rectangular wave, AC square wave or agile frequency conversion.

[0051] The above adjustment methods are suitable for targeted demulsification of crude oils with different properties.

[0052] The medium and low voltage bare electrode electric field demulsification system 8, the fast conversion electromagnetic field demulsification system 12 and the fast conversion solenoid demulsification system 13 are powered separately;

[0053] Alternatively, the medium and low voltage bare electrode electric field demulsification system 8 and the fast-changing solenoid demulsification system 13 are centrally powered by solenoids, and the power supply characteristics are determined by the bare electrodes.

[0054] An oil collecting area and a water collecting area are arranged at the rear of the three-phase separator, and a heating device (optional) is arranged outside the separator tank.

[0055] In summary, it can be seen that the three-phase separator with multiple electric fields and magnetic fields synergistically strengthened in the embodiment of the present invention simplifies the existing thermochemical treatment process of crude oil. The multiple electric fields and magnetic fields generated by the medium and low voltage bare electrode electric field demulsification system, the separator external fast-changing solenoid demulsification system and the separator external fast-changing electromagnetic field demulsification system simultaneously perform effective electric field demulsification and electrostatic agglomeration dehydration on the crude oil emulsion, and can strengthen the chemical demulsification process in the electric field, shorten the residence time of conventional electric field treatment of crude oil, and realize closed, efficient and low-cost treatment of crude oil. The three-phase separator with multiple electric fields and magnetic fields synergistically strengthened has a simple structure, low construction cost and easy maintenance.

[0056] The three-phase separator with multiple electric and magnetic field synergistic enhancement of the present invention, the medium and low voltage bare electrodes 8 in the separator tank are installed in an integrated manner, and the pole plates are longitudinal inclined plates with inclined plate sedimentation effect, several pairs of electrodes are a whole, and mounting brackets of the electrodes are arranged at corresponding positions in the tank; electrodes of the same polarity are connected by cables, the medium and low voltage bare electrodes 8 are connected to the medium and low voltage bare electrode power supply ports of the power supply hub 11, and the grounding electrode 9 is connected to the ground wire, and insulating materials are arranged between pole plates of different polarities;

[0057] The medium and low voltage bare electrodes 8 in the separator tank are also easy to install. The four corners of each electrode plate in one group are connected by four angle steels, and the electrode plates and the angle steels are fixed by angle codes. A mounting bracket for the electrode is provided at a corresponding position in the tank. Two angle steels on one side of a group of electrodes are connected to the power supply terminals of the power connection hub, and two angle steels on the other side are grounded. In this method, the electrode plates are spliced ​​by metal electrodes and insulating materials of appropriate size, so that the insulating side of the grounded electrode plate is directly fixed to the angle steel on the power-connected side, and the insulating side of the electrode plate is directly fixed to the angle steel on the grounded side.

[0058] The fast-changing electromagnetic field device includes a plurality of annular iron cores, which are evenly arranged on the separator tank, and each annular iron core is provided with a fast-changing excitation winding. An insulating fixing bracket is provided between the iron core and the straight tube 1, and the excitation winding is pre-buried in the insulating fixing bracket to meet the explosion-proof requirements.

[0059] The external fast-changing solenoid demulsification system comprises a solenoid with a main tank body as an axis outside the tank, a main pipe body and a heat-insulating protective layer of the solenoid, and an explosion-proof shell of the external solenoid (optional).

[0060] The three-phase separator with multiple electric fields and magnetic fields synergistically strengthened in the embodiment of the present invention aims at the difficult problem of crude oil demulsification and separation treatment. It fully utilizes the volume space of the separator to set up a medium-low voltage bare electrode electric field demulsification system, and also sets up an external fast-changing electromagnetic field demulsification system and an external fast-changing solenoid system. The multiple electric fields and magnetic fields generated by the three perform electric field demulsification and electrostatic agglomeration on the emulsion from different dimensions, and are combined with demulsifiers to strengthen the chemical demulsification effect of crude oil, improve the oil-water separation efficiency, and fully shorten the treatment time. The existing thermochemical treatment process of crude oil is simplified. Multiple electric fields and magnetic fields effectively demulsify and agglomerate and dehydrate the emulsion from different dimensions, and can strengthen the chemical demulsification process in the electric field, shorten the residence time, and realize closed, efficient, and low-cost treatment of crude oil.

[0061] The three-phase separator with multiple electric fields and magnetic fields synergistically enhanced provided by the embodiment of the present invention has, on the one hand, a medium and low voltage bare electrode electric field demulsification system, which directly performs electric field demulsification and strengthens the chemical demulsification effect, thereby improving the monomer processing efficiency of the separator; on the other hand, the magnetic field generated by the external fast-changing electromagnetic field demulsification system and its induced electric field demulsify the crude oil emulsion and strengthen the chemical demulsification effect; on the other hand, the magnetic field generated by the external fast-changing solenoid demulsification system and its induced electric field demulsify the crude oil emulsion and strengthen the chemical demulsification effect; the multiple magnetic fields and electric fields generated by the above three processes the crude oil emulsions of different forms in the separator tank instead of the conventional single electric field processing method, fully processes the crude oil emulsion, further reduces the water content of the treated crude oil produced liquid, and reduces the oil concentration of the water cut, while also greatly reducing the reagent cost and heating cost.

[0062] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the embodiments of the present invention are described in detail with specific embodiments below.

[0063] The main equipment involved in the present invention includes a separator tank, a tubular distributor, a crude oil pipeline, a dosing pipeline, an oil outlet pipeline, an air outlet pipeline, a power supply device, and a heating device (optional). The crude oil produced liquid to be processed, the dilution water (optional), and the demulsifier are heated by the heat exchanger and fully mixed under the action of the static mixer and the mixing valve, and then enter the inlet of the tubular distributor in the separator. The dilution water (optional) extracts the salt in the crude oil during the mixing process. The oil-water mixture enters through the inlet of the tubular distributor outside the tank body, and is sprayed from the vertical pipe inside the tank body toward the outlet hole on one side of the adjacent head, and then collides with the head. In this process, the oil and gas are initially separated and the direction and speed of the fluid are changed. Then the liquid phase is led to a section below the liquid surface, and the oil and water are separated by the difference in density between oil and water. The bottom is the separated water-rich layer, and the upper part is the oil-rich layer and the emulsion layer containing dispersed water droplets. During the limited hydraulic retention time of the separator, some emulsions cannot be fully demulsified, and an oil-water emulsion layer is formed between the upper oil zone and the lower water zone; and a single electric field cannot effectively treat severely emulsified emulsions. There are water particles of oil-in-water type dispersed phase in the oil-rich layer, and there are both water-in-oil and oil-in-water dispersed phases in the water-rich layer. Therefore, the medium and low voltage bare electrode demulsification system is fully distributed in the liquid phase of the separator without affecting the installation and maintenance. In order to better handle the dispersed phases in the oil-rich layer, water-rich layer and emulsified layer, a fast-changing electromagnetic field demulsification system and a fast-changing solenoid demulsification system are set outside the separator, and the multiple magnetic fields and electric fields generated by the two are used to demulsify the dispersed phases in different states. The emulsion in the separator can be effectively treated by the multiple electric and magnetic fields generated by the three demulsification systems to treat the emulsion from different dimensions.

[0064] In order to improve the processing efficiency of the separator, the present invention also adopts the electric field to enhance the chemical demulsification effect of the demulsifier, that is, the demulsifier is added to the inlet crude oil and the dilution water (optional) while being mixed, and the temperature is increased by passing through a heat exchanger before entering the external inlet of the tubular distributor, so that the electric field and the demulsifier can achieve a higher demulsification efficiency under the coupling synergistic effect of a certain temperature.

[0065] The three-phase separator with multiple electric fields and magnetic fields synergistically enhanced provided by the embodiment of the present invention, on the one hand, the medium and low voltage bare electrode electric field demulsification system in the tank directly performs electric field demulsification and strengthens the chemical demulsification effect, thereby improving the monomer processing efficiency of the separator; on the other hand, the magnetic field and the induced electric field generated by the external fast-changing electromagnetic field demulsification system demulsify the crude oil emulsion and strengthen the chemical demulsification effect; on the other hand, the magnetic field and the induced electric field generated by the external fast-changing solenoid demulsification system demulsify the crude oil emulsion and strengthen the chemical demulsification effect; the multiple magnetic fields and electric fields generated by the above three treat the different forms of crude oil emulsions in the separator tank instead of the conventional single electric field treatment method, fully treat the crude oil emulsion, further reduce the water content of the treated crude oil production liquid, and reduce the oil concentration of the water cut, while also greatly reducing the cost of reagents and heating costs. The electric field demulsification in the tank uses medium and low voltage bare electrodes to reduce the manufacturing cost and installation difficulty. The electric field induced by the external fast-changing electromagnetic field demulsification system and the external fast-changing solenoid demulsification system will not cause invalid power loss and electric field collapse due to the absence of a current loop.

[0066] Example 1

[0067] like Figure 1 , Figure 2 and Figure 3 As shown, the crude oil to be treated in the crude oil pipeline 3 and the dilution water (optional) in the water injection pipeline 2 are mixed through the static mixer 5 and the mixing valve 6. At the same time, in order to ensure that the separator has a relatively good demulsification effect, an appropriate amount of demulsifier is added to the mixed liquid through the reagent pipeline 1, and then the mixed liquid is appropriately heated through the heat exchange device 4. The mixed liquid enters through the inlet of the tubular distributor 7 outside the tank body, and is sprayed out from the vertical pipe inside the tank body toward the outlet hole on the side of the adjacent head, and then collides with the head. In this process, the oil and gas are initially separated and the direction and speed of the fluid are changed. The gas floats to the top of the tank to form a gas phase layer, and then the liquid phase is led below the liquid surface. The oil and water layers are separated by the difference in oil and water density. The bottom is the separated water-rich layer, and the upper part is the oil-rich layer and the emulsion layer containing dispersed water droplets. The liquid phase layer is provided with a medium and low pressure bare electrode demulsification system, and the fast-changing electromagnetic field demulsification system and the solenoid demulsification system arranged outside the separator tank simultaneously demulsify the liquid phase in the tube.

[0068] The fast-changing electromagnetic field device includes several annular iron cores, which are evenly distributed on the separator tank, and each annular iron core is provided with a fast-changing excitation winding. There is an insulating fixing bracket between the iron core and the straight pipe, and the excitation winding is pre-buried in the insulating fixing bracket to meet the explosion-proof requirements. In this embodiment, the iron core material can be selected from soft magnetic materials, such as silicon steel sheets, ferrites, iron-based amorphous, iron-based microcrystals, etc., and the corresponding materials can be used according to the crude oil processing scenario and in combination with the requirements of cost, crude oil dehydration effect, etc. The annular iron core sleeved on the separator tank can be used Figure 4a , Figure 4b The core monomer composition shown.

[0069] The external fast-changing solenoid demulsification system comprises a solenoid with a main tank body as an axis outside the tank, a main pipe body and a heat-insulating protective layer of the solenoid, and an explosion-proof shell of the external solenoid (optional).

[0070] The medium and low voltage bare electrode electric field demulsification system adopts a rectangular wave power supply mode, the power supply voltage is adjustable between 10V and 2kV, the pulse frequency is adjustable between 500Hz and 250kHz, and the power supply commutation frequency is adjustable between 50Hz and 5kHz to ensure that the bare electrode is not corroded;

[0071] When the fast-changing electromagnetic field system is powered, the current change rate in the excitation winding is ≥10A / us, and the higher the change rate, the better the effect; the voltage is adjustable between 50V and 5kV; the excitation frequency of the excitation winding can have three frequency adjustment intervals, frequency adjustment interval 1 is a conventional frequency interval between 500Hz and 20kHz, frequency adjustment interval 2 is an ultra-high frequency interval between 20kHz and 250kHz, and frequency adjustment interval 3 is a near-microwave frequency interval between 500kHz and 500MHz; various optimized composite frequencies can be used when exciting the excitation winding; the excitation voltage waveform can be a rectangular wave, an AC square wave, and a fast frequency change.

[0072] The fast-changing solenoid demulsification system has a current change rate of ≥10A / us for the solenoid power supply, and the higher the change rate, the better the effect; the voltage is adjustable between 10V and 2kV; the solenoid power supply frequency adjustment range is between 500Hz and 250kHz, and the solenoid power supply frequency can adopt an optimized composite of various frequencies; the solenoid power supply voltage waveform can be a rectangular wave, an AC square wave, and agile frequency conversion.

[0073] When the medium and low voltage bare electrode electric field demulsification system, the fast change electromagnetic field demulsification system and the fast change solenoid demulsification system are powered together, from the perspective of cost saving, the medium and low voltage bare electrode electric field demulsification system and the fast change solenoid demulsification system can also be powered by solenoids, and the power supply characteristics are mainly determined by the bare electrode.

[0074] After the above treatment, the oil in the crude oil collection section (optional) of the tank is transported out through the external transmission pipeline 15, and the water at the bottom is transported to the sewage treatment process through the pipeline 17, part of which is circulated to the sand flushing water pipeline 16 as a sand flushing water source, and the sand flushing manifold 18 is used to blow away the sediment at the bottom of the separator tank.

[0075] In order to further improve the processing efficiency, the crude oil produced liquid is heated to a certain extent by a heating device or a heat exchanger before entering the separator tubular distributor, and at the same time, an appropriate amount of demulsifier is added to the incoming liquid through the reagent pipeline.

[0076] Compared with other similar devices in the field, the present invention has the following advantages:

[0077] 1. For the treatment of oil-water emulsion in the separator, compared with the treatment methods such as centrifugation, chemical demulsification, and flash evaporation, the three-phase separator with multiple electric and magnetic field synergistic enhancement requires fewer treatment units and has higher treatment efficiency. It does not require large-scale temperature increase operations and the addition of large amounts of chemical agents, which can significantly save treatment costs and ensure the smooth and efficient operation of the separator on the basis of improving treatment efficiency.

[0078] 2. The electric field generated by the medium and low voltage bare electrode electric field demulsification system, the magnetic field generated by the external fast-changing electromagnetic field demulsification system and its induced electric field, and the magnetic field generated by the external fast-changing solenoid demulsification system and its induced electric field, demulsify the liquid in the tank from different dimensions at the same time, strengthen the effect of chemical agents, and improve the monomer processing efficiency of the separator.

[0079] 3. The medium and low voltage bare electrode electric field cooperates with the power supply device to replace the conventional high-frequency / high-voltage electric field to effectively treat the high-water crude oil emulsion, which can achieve stable dehydration without electric field collapse; the medium and low voltage bare electrode electric field has low cost and is easy to install, which greatly reduces the manufacturing cost of the electric field enhanced three-phase separator.

[0080] 4. The external electromagnetic field demulsification system and the external fast-changing solenoid demulsification system are arranged outside the separator tank, which is convenient for maintenance. The electric field induced by the external fast-changing electromagnetic field demulsification system and the external fast-changing solenoid demulsification system will not cause invalid power loss and electric field collapse due to the absence of current loop.

[0081] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A three-phase separator with multiple electric and magnetic field synergistic enhancement, characterized in that: The separator tank comprises a separator tank body, one end of which is connected to a crude oil pipeline (3), a water injection pipeline (2) and a drug addition pipeline (1), the other end of which is connected to an oil outlet pipeline (15), the upper part of which is connected to an air outlet pipeline (14), and the lower part of which is connected to a drainage pipeline (17); a side branch of the drainage pipeline (17) is connected to a mud and sand flushing water pipeline (16) through a water pump and the separator tank body; A tubular distributor (7) is provided in the separator tank body and is connected to the crude oil pipeline (3); the area from the tubular distributor (7) to the oil outlet pipeline (15) is a crude oil processing area; A medium- and low-voltage bare electrode electric field demulsification system (8) is provided inside the separator tank, and a fast-changing electromagnetic field demulsification system (12) and a fast-changing solenoid demulsification system (13) are provided outside the separator tank; The separator tank body is provided with a power supply device (10) and a power supply connection hub (11) for use in conjunction with each other.

2. The three-phase separator with multiple electric field and magnetic field synergistic enhancement according to claim 1, characterized in that: The bare electrodes of the medium and low voltage bare electrode electric field demulsification system (8) adopt a rectangular wave power supply mode, the power supply voltage is between 10V and 2kV, the pulse frequency is between 500Hz and 250kHz, and the power supply switching frequency is between 50Hz and 5kHz.

3. The three-phase separator with multiple electric field and magnetic field synergistic enhancement according to claim 1, characterized in that: The fast-changing electromagnetic field crude oil demulsification system (12) comprises a plurality of annular iron cores, which are sleeved on the separator tank body, and each annular iron core is provided with a fast-changing excitation winding; An insulating fixing bracket is arranged between the iron core and the separator tank body, and the excitation winding is pre-buried in the insulating fixing bracket.

4. The three-phase separator with multiple electric field and magnetic field synergistic enhancement according to claim 3, characterized in that: The fast-changing excitation windings are all connected in parallel and powered by an excitation power supply device; Alternatively, they are grouped and connected in parallel, with each group powered by an excitation power supply device, and the waveforms generated by the multiple excitation power supplies must be consistent in phase.

5. The three-phase separator with multiple electric field and magnetic field synergistic enhancement according to claim 4, characterized in that: The current change rate in the excitation winding is ≥10A / us; the voltage is between 50V and 5kV; The excitation frequency of the excitation winding has three frequency adjustment ranges: Frequency adjustment interval 1 is the normal frequency interval between 500Hz and 20kHz; Frequency adjustment interval 2 is the ultra-high frequency interval between 20kHz and 250kHz; Frequency adjustment interval 3 is a near-microwave frequency interval between 500kHz and 500MHz; When exciting the field winding, various optimized composite frequencies are used, and the excitation voltage waveform is rectangular wave, AC square wave or agile frequency conversion; The above adjustment methods are suitable for targeted demulsification of crude oils with different properties.

6. The three-phase separator with multiple electric and magnetic field synergistic enhancement according to claim 1, characterized in that: The fast-changing solenoid demulsification system (13) is a common high-temperature wire that is inserted into an explosion-proof pipe and then wrapped around the separator tank.

7. The three-phase separator with multiple electric field and magnetic field synergistic enhancement according to claim 6, characterized in that: The solenoid power supply of the fast-changing solenoid demulsification system (13) has a current change rate of ≥10A / us; the voltage is adjustable between 10V and 2kV; The adjustment range of the solenoid power supply frequency is between 500Hz and 250kHz. The solenoid power supply frequency adopts the optimized composite of various frequencies. The solenoid power supply voltage waveform is rectangular wave, AC square wave or agile frequency conversion. The above adjustment methods are suitable for targeted demulsification of crude oils with different properties.

8. The three-phase separator with multiple electric field and magnetic field synergistic enhancement according to any one of claims 2 to 7, characterized in that: The medium and low voltage bare electrode electric field demulsification system (8), the fast conversion electromagnetic field demulsification system (12) and the fast conversion solenoid demulsification system (13) are powered separately; Alternatively, the medium and low voltage bare electrode electric field demulsification system (8) and the fast-changing solenoid demulsification system (13) are centrally powered by solenoids, and the power supply characteristics are determined by the bare electrodes.

9. The three-phase separator with multiple electric field and magnetic field synergistic enhancement according to claim 8, characterized in that: The rear part of the three-phase separator is provided with an oil collecting area and a water collecting area, and the separator tank body is provided with a heating device.

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