Application technical equipment for enhancing oil extraction, water shutoff, oil increase and recovery efficiency improvement through electroosmotic flow

Abstract

The utility model discloses application technical equipment for enhancing oil extraction, water plugging, oil increase and recovery efficiency improvement through electroosmotic flow, belongs to the technical field of oil exploitation, and solves the problems that an existing device only depends on basic electroosmotic flow to act on an oil reservoir, a dead oil area and a remaining oil area are difficult to activate, and the yield increasing effect is limited. Comprising a combined transformer, a switch cabinet, a high-frequency oil extraction power supply device, a transmission cable and a sleeve group, according to the utility model, the high-frequency oil extraction power supply device is arranged, and the high-frequency oil extraction power supply device can accurately dredge a dead oil area, a remaining oil area and a capillary bound water area which are not used in water injection development through a multi-mechanism synergistic effect of'fracture forming-water plugging-electrochemical plugging removal 'of high-frequency pulse electromagnetic waves, so that the swept volume is enlarged; meanwhile, a water film on the rock surface is driven to be thinned, a seepage space is vacated for oil flow, the water reducing and oil increasing effects are more remarkable, and the purpose of high recovery efficiency is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of petroleum extraction technology, specifically relating to electro-osmotic flow-enhanced oil recovery technology and equipment for water shut-off and oil enhancement. Background Technology

[0002] As one of the world's most important energy resources, the efficient development and recovery of oil have always been core issues for the petroleum industry. With the continuous deepening of global oil and gas resource development, most major oilfields have entered the middle and late stages of development. Problems such as significant formation energy depletion, decreased permeability, and increased water content in the extracted crude oil (e.g., water channeling and flooding formed after water injection, and increased heterogeneity of the oil layer) are becoming increasingly prominent, leading to a decline in crude oil recovery rates. How to tap the remaining oil potential and improve recovery rates through technological innovation has become crucial for the sustainable development of the petroleum industry.

[0003] Currently, enhanced oil recovery (EOR) technologies are mainly divided into two categories: chemical flooding and physical field control. Chemical flooding technology has significant limitations: firstly, the injection of chemical agents is costly, and they are prone to degradation and adsorption losses under high temperature and pressure conditions in the formation, resulting in low actual utilization rates; secondly, some chemical agents may cause irreversible damage to the formation or trigger environmental problems such as groundwater pollution, limiting their widespread application in environmentally sensitive areas.

[0004] Chinese patent CN112211605A discloses a pulsed electro-osmotic oil recovery device, which includes a working box containing a power supply, a pulse generator, two electrode wires, and two electrode plates. Four casters are mounted on the bottom of the working box, and a support plate is fixedly installed inside. The power supply and pulse generator are located on top of the support plate, and a storage box is located on the top of the working box, containing both electrode plates. A push plate is vertically slidably installed inside the working box, and four support legs are fixedly installed at the bottom of the push plate. However, existing devices rely solely on basic electro-osmotic flow to act on the reservoir, making it difficult to activate dead and remaining oil zones, resulting in limited production enhancement. To address these issues, we propose an electro-osmotic enhanced oil recovery technology and equipment. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an application technology and equipment for enhancing oil recovery through electroosmotic flow, thereby solving the problem that existing devices rely solely on basic electroosmotic flow to act on the reservoir.

[0006] Existing equipment relies solely on basic electro-osmotic flow to act on the reservoir, which is insufficient to activate dead and remaining oil zones, resulting in limited production enhancement. To address these issues, we propose an electro-osmotic flow-enhanced oil recovery technology and equipment. In short, the equipment consists of a combined transformer, switchgear, a high-frequency oil production power supply unit, transmission cables, and casing assemblies. During operation, the combined transformer is connected to a 10kV high-voltage line on-site, converting the 10kV high-voltage line to the voltage required for high-frequency pulse current. Simultaneously, the switchgear is activated, and the combined transformer supplies power to the high-frequency oil production power supply unit. The current and voltage are selected (based on well spacing, physical properties, and formation electrical characteristics). The high-frequency oil production power supply unit generates a high-frequency pulse current for oil production. This high-frequency pulse current is transmitted via the transmission cable to the positive terminal, forming a high-frequency pulse wave. Continuous operation for approximately 24 to 72 hours can achieve the effects of reducing water levels, increasing fluid volume, and enhancing production. The operating time can be appropriately increased depending on the viscosity of the heavy oil. Twenty-four hours after the start of operation, the water content of the extracted fluid is measured and analyzed. The increase and change in fluid volume, as well as temperature changes, determine whether to extend the operation time, adjust the parameters, or terminate the operation. In this embodiment, a high-frequency oil production power supply device is provided. As the core component of the high-frequency electro-osmotic oil production technology, this device outputs high-frequency pulsed electromagnetic waves of a specific frequency (≥10kHz). Through the synergistic effect of multiple mechanisms of "fracturing-water blocking-electrochemical unblocking" of the high-frequency pulsed electromagnetic waves, it can precisely dredge unused dead oil areas, remaining oil areas, and capillary bound water areas in water injection development, expanding the affected volume. Simultaneously, it drives the thinning of the water film on the rock surface, creating seepage space for oil flow, significantly improving the oil phase flow capacity, and directly reducing the oil-water interfacial tension. Furthermore, by using electro-osmotic flow to directionally drive bound water and narrow the water phase seepage channels, the water reduction and oil increase effects are more significant.

[0007] This utility model is implemented as follows: Electro-osmotic flow-enhanced oil recovery technology and equipment, including:

[0008] A combined transformer, electrically connected to a 10KV high-voltage line, is used to convert the high-voltage electricity of the 10KV high-voltage line into the voltage required for high-frequency pulse current.

[0009] The switch cabinet is electrically connected to the combined transformer and is used to control the circuit switching and overload protection.

[0010] The high-frequency oil production power supply unit is electrically connected to the switch cabinet and is used to generate and output high-frequency pulse current for oil production.

[0011] A transmission cable is electrically connected to the high-frequency oil production power supply device and is used to transmit high-frequency pulse current;

[0012] The casing assembly, located within the reservoir, is used to support the positive and negative electrodes and assist them in generating high-frequency pulse waves.

[0013] Preferably, the combined transformer comprises:

[0014] The high-voltage transformer is electrically connected to the 10KV high-voltage line and is used to convert the high-voltage electricity of the 10KV high-voltage line into 380V AC electricity.

[0015] The low-voltage transformer is electrically connected to the high-voltage transformer and to the switch cabinet. The low-voltage transformer is used to supply power to the high-frequency oil extraction power supply unit.

[0016] Preferably, the sleeve assembly comprises:

[0017] The positive electrode bushing is installed inside the oil reservoir. A connecting positive electrode is fitted on the positive electrode bushing. The connecting positive electrode is electrically connected to the high-frequency oil production power supply device through a transmission cable.

[0018] The negative electrode bushing is installed inside the oil reservoir. A connecting negative electrode is fitted on the negative electrode bushing, and the connecting negative electrode is electrically connected to the high-frequency oil production power supply device through a transmission cable.

[0019] Preferably, the high-frequency oil production power supply device includes:

[0020] A high-frequency electrical processing main control unit is fixedly installed inside the high-frequency oil production power supply unit.

[0021] A power conversion module, which is electrically connected to the high-frequency electrical processing main control, is used to convert low-voltage AC power into high-frequency pulse current. The frequency adjustment range of the power conversion module is 10kHz-1MHz.

[0022] An isolation transformer is installed inside the high-frequency oil extraction power supply unit, and the isolation transformer is electrically connected to the high-frequency power processing main control unit.

[0023] At least one set of isolation protectors is installed in the high-frequency oil production power supply unit. The isolation protectors are electrically connected to the high-frequency electrical processing main control unit and also electrically connected to the transmission cable.

[0024] Preferably, the high-frequency electrical processing main controller includes:

[0025] The data acquisition unit is used to acquire and parse the high-frequency pulse current generation parameters, and generate high-frequency electrical processing instructions based on the high-frequency pulse current generation parameters.

[0026] The power access unit, in response to high-frequency power processing commands, controls the combined transformer and switchgear to open, enabling the power conversion module to connect to AC power, and converts the AC power into high-frequency pulse special electromagnetic waves through rectification and frequency conversion;

[0027] Multiple operating units respond to high-frequency electrical processing commands and apply different high-frequency pulse waves to the oil layer based on different high-frequency electrical processing commands. When different high-frequency pulse waves are applied to the oil layer based on different high-frequency electrical processing commands, the high-frequency pulse waves generate electric explosions and electric shocks when passing through the formation, and generate high-temperature and high-pressure gases, thereby improving the conductivity of the oil layer.

[0028] Preferably, the high-frequency oil production power supply device operates at a voltage of 150V, has a maximum current of 1500A, and a high-frequency pulse current loading rate ≥10. 6 V / s, and the high-frequency pulse current is 0-120V isolated high-frequency DC, ensuring that the peak pressure is reached within 0.1-20ms.

[0029] Preferably, the negative electrode casing is installed inside a water well, and the positive electrode casing is installed inside an oil well.

[0030] Preferably, the transmission cable is 120mm. 2 Copper cable, 1500m in length.

[0031] Compared with the prior art, the embodiments of this application have the following main advantages:

[0032] In this embodiment of the invention, a high-frequency oil production power supply device is provided. As the core component of the high-frequency electro-osmotic oil production technology, the high-frequency oil production power supply device outputs high-frequency pulse electromagnetic waves of a specific frequency (≥10kHz). Through the synergistic effect of multiple mechanisms of "fracture creation-water blocking-electrochemical unblocking" of the high-frequency pulse electromagnetic waves, it can accurately dredge unused dead oil areas, residual oil areas, and capillary bound water areas in water injection development, expand the affected volume, drive the water film on the rock surface to thin, create seepage space for oil flow, significantly improve the flow capacity of the oil phase, and directly reduce the interfacial tension between oil and water. At the same time, it uses electro-osmotic flow to directionally drive bound water and narrow the water phase seepage channel, resulting in a more significant effect of reducing water and increasing oil production.

[0033] High-frequency oil recovery power supply units can be applied to general sandstone and carbonate formations. They are also suitable for high, medium, and low permeability formations, as well as ultra-low permeability formations that have undergone fracturing. Practice has shown that this technology produces significant and satisfactory results in some low-permeability or ultra-low-permeability oil wells where acid fracturing is ineffective or yields poor results. Furthermore, this technology is suitable for low-permeability oilfields with a water cut of 95%, enabling increased fluid production, injection, and overall production, thereby enhancing oil recovery. It is not limited or affected by formation temperature or water salinity.

[0034] The electroosmotic flow-enhanced oil recovery technology and equipment provided in this embodiment of the invention have the following advantages: simple operation, convenient construction, and easy to implement. It can solve production problems on demand, such as high water content in the produced fluid, formation blockage between two wells (structural blockage or wax blockage), excessively high injection pressure, or inability to inject water. It is highly adaptable; only two wells in the same production layer are required for operation, and the operation can proceed simply by having geologists propose the problem to be solved and the requirements, and develop a construction plan and objectives. It has a wide range of applications, handles many types of problems, has a short operation time, and can operate without interrupting production. It is environmentally friendly and pollution-free, causing no damage to the formation; it does not produce any side effects or residual problems for the oilfield; and it can be laid out in any direction to drive areas with abundant remaining oil in the formation. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the electro-osmotic flow enhanced oil recovery technology and equipment provided by this utility model.

[0036] Figure 2 This is a schematic diagram of the structure of the high-frequency oil extraction power supply device provided by this utility model.

[0037] In the diagram: 100-Combined transformer, 110-High voltage transformer, 120-Low voltage transformer, 200-Switchgear, 300-High frequency oil production power supply unit, 310-High frequency electrical processing main control, 311-Data acquisition unit, 312-Electrical access unit, 313-Multi-operation unit, 320-Power conversion module, 330-Isolation transformer, 340-Isolation protector, 400-Transmission cable, 500-Bushing assembly, 510-Positive bushing, 520-Negative bushing. Detailed Implementation

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0039] Existing equipment relies solely on basic electroosmotic flow to the reservoir, resulting in an inability to selectively control water without blocking oil, and difficulty in activating dead and remaining oil zones, leading to limited production enhancement. To address these issues, we propose an electroosmotic flow-enhanced oil recovery technology and equipment. In short, the equipment consists of a combined transformer 100, a switchgear 200, a high-frequency oil production power supply 300, a transmission cable 400, and a bushing assembly 500. During operation, the combined transformer 100 is connected to a 10kV high-voltage line on-site and converts the 10kV high-voltage line to high frequency... The voltage required for the pulsed current is simultaneously activated by switch cabinet 200, and combined transformer 100 supplies power to high-frequency oil production power supply unit 300. The current and voltage are selected (based on well spacing, physical properties, and formation electrical characteristics). High-frequency oil production power supply unit 300 generates a high-frequency pulsed current for oil production. This high-frequency pulsed current is transmitted via transmission cable 400 to the positive terminals, forming a high-frequency pulse wave. Continuous operation for approximately 24 to 72 hours can achieve the effects of reducing water content, increasing fluid volume, and increasing production. The operation time can be appropriately increased depending on the viscosity of the crude oil. After 24 hours of operation, the water content of the produced fluid, the increase and change in fluid volume, and the temperature change are measured and analyzed to determine whether to extend the operation time, adjust the operation parameters, or terminate the operation. In this embodiment of the invention, a high-frequency oil production power supply device 300 is provided. As the core component of the high-frequency electro-osmotic oil production technology, the high-frequency oil production power supply device 300 outputs high-frequency pulse electromagnetic waves of a specific frequency (≥10kHz). Through the synergistic effect of multiple mechanisms of "fracturing-water blocking-electrochemical unblocking" of the high-frequency pulse electromagnetic waves, it can accurately dredge unused dead oil areas, residual oil areas, and capillary bound water areas in water injection development, expand the affected volume, drive the water film on the rock surface to thin, create seepage space for oil flow, significantly improve the flow capacity of the oil phase, and directly reduce the interfacial tension between oil and water. At the same time, it uses electro-osmotic flow to directionally drive bound water and narrow the water phase seepage channel, resulting in a more significant effect of reducing water and increasing oil production.

[0040] This utility model embodiment provides an application technology and equipment for enhancing oil recovery through electroosmotic flow, such as... Figure 1 As shown, the electroosmotic flow-enhanced oil recovery technology and equipment includes:

[0041] The combined transformer 100 is electrically connected to the 10KV high-voltage line and is used to convert the high voltage of the 10KV high-voltage line into the voltage required for high-frequency pulse current.

[0042] The switch cabinet 200 is electrically connected to the combined transformer 100 and is used to control the circuit switching and overload protection;

[0043] It should be noted that the switch cabinet 200 is also connected to a water cooling device.

[0044] The high-frequency oil production power supply device 300 is electrically connected to the switch cabinet 200 and is used to generate and output high-frequency pulse current for oil production.

[0045] A transmission cable 400 is electrically connected to the high-frequency oil production power supply device 300 for transmitting high-frequency pulse current. The transmission cable 400 is 120mm long. 2 Copper cable, 1500m in length;

[0046] The casing assembly 500 is installed inside the reservoir to support the positive and negative electrodes and assist the positive and negative electrodes in generating high-frequency pulse waves.

[0047] In this embodiment, the sleeve assembly 500 includes:

[0048] Positive electrode bushing 510 is installed inside the oil reservoir. A positive electrode is fitted on the positive electrode bushing 510. The positive electrode is electrically connected to the high-frequency oil production power supply device 300 through the transmission cable 400.

[0049] The negative electrode bushing 520 is installed inside the oil reservoir. A connecting negative electrode is fitted on the negative electrode bushing 520. The connecting negative electrode is electrically connected to the high-frequency oil production power supply device 300 through the transmission cable 400.

[0050] The negative casing 520 is installed in the water well, and the positive casing 510 is installed in the oil well. The oil well depth is no more than 3,500 meters. For oil wells deeper than 3,500 meters, the parameters need to be tested before the decision can be made. The distance between wells on the surface should generally not exceed 500 meters.

[0051] In this embodiment of the invention, a high-frequency oil production power supply device 300 is provided. As the core component of the high-frequency electro-osmotic oil production technology, the high-frequency oil production power supply device 300 outputs high-frequency pulse electromagnetic waves of a specific frequency (≥10kHz). Through the synergistic effect of multiple mechanisms of "fracturing-water blocking-electrochemical unblocking" of the high-frequency pulse electromagnetic waves, it can accurately dredge unused dead oil areas, residual oil areas, and capillary bound water areas in water injection development, expand the affected volume, drive the water film on the rock surface to thin, create seepage space for oil flow, significantly improve the flow capacity of the oil phase, and directly reduce the interfacial tension between oil and water. At the same time, it uses electro-osmotic flow to directionally drive bound water and narrow the water phase seepage channel, resulting in a more significant effect of reducing water and increasing oil production.

[0052] In a further preferred embodiment of this utility model, the combined transformer 100 includes:

[0053] High-voltage transformer 110 is electrically connected to a 10KV high-voltage line and is used to convert the high-voltage electricity of the 10KV high-voltage line into 380V AC electricity.

[0054] The low-voltage transformer 120 is electrically connected to the high-voltage transformer 110 and to the switch cabinet 200. The low-voltage transformer 120 is used to supply power to the high-frequency oil production power supply device 300.

[0055] In a further preferred embodiment of this utility model, such as Figure 2 As shown, the high-frequency oil production power supply device 300 includes:

[0056] The high-frequency electrical processing main control unit 310 is fixedly installed inside the high-frequency oil production power supply unit 300.

[0057] The power conversion module 320 is electrically connected to the high-frequency power processing main control 310 and is used to convert low-voltage AC power into high-frequency pulse current. The frequency adjustment range of the power conversion module 320 is 10kHz-1MHz.

[0058] An isolation transformer 330 is installed inside the high-frequency oil production power supply unit 300, and the isolation transformer 330 is electrically connected to the high-frequency electrical processing main control unit 310.

[0059] At least one set of isolation protectors 340 are provided in the high-frequency oil production power supply device 300. The isolation protectors 340 are electrically connected to the high-frequency electrical processing main control 310 and also electrically connected to the transmission cable 400.

[0060] In this embodiment, the oil production mechanism of the high-frequency oil production power supply device 300 is that the oil layer is altered in terms of its spatial and interfacial structure by the action of high-frequency special electromagnetic waves. Specifically, it breaks up blockages between the two wells in the oil layer, increases permeability, and generates micro-fractures, reducing the tension and adhesion of the oil-water and rock interfaces. In particular, it enhances the attraction of static electricity to oil in the formation. Simultaneously, in areas with abundant capillary water, the heat generated by electricity vaporizes the water, further blocking its seepage and reducing the water content of the produced fluid. Essentially, the oil layer's physical properties are modified under the action of high-frequency special waves, increasing crude oil production and oilfield recovery. In this embodiment, the high-frequency oil production power supply device 300 can be applied to general sandstone and carbonate formations. It is also suitable for high, medium, and low permeability formations, as well as ultra-low permeability formations that have undergone fracturing. Practice has shown that this technology produces significantly satisfactory results in some low-permeability or ultra-low-permeability oil wells where acid fracturing is ineffective or has poor results. Furthermore, this technology can be applied to increase fluid production, injection, and overall production in low-permeability oilfields with a water cut of 95%, thereby enhancing oil recovery. It is not limited or affected by formation temperature or water salinity.

[0061] It should be noted that the combined transformer 100, switchgear 200, and high-frequency oil extraction power supply device 300 can all be installed on the field operation vehicle, thereby enabling the operation vehicle to flexibly transport the combined transformer 100, switchgear 200, and high-frequency oil extraction power supply device 300 to the vicinity of the 10KV high-voltage line.

[0062] In a further preferred embodiment of this utility model, such as Figure 2 As shown, the high-frequency electrical processing main control 310 includes:

[0063] Data acquisition unit 311 is used to acquire and parse high-frequency pulse current generation parameters, and generate high-frequency electrical processing instructions based on the high-frequency pulse current generation parameters;

[0064] The power access unit 312, in response to the high-frequency power processing command, controls the combined transformer 100 and the switch cabinet 200 to open, so that the power conversion module 320 is connected to AC power, and converts the AC power into high-frequency pulse special electromagnetic waves through rectification and frequency conversion.

[0065] The multiple operation unit 313 responds to high-frequency electrical processing commands and applies different high-frequency pulse waves to the oil layer based on different high-frequency electrical processing commands. When different high-frequency pulse waves are applied to the oil layer based on different high-frequency electrical processing commands, the high-frequency pulse waves generate electric explosions and electric shocks when passing through the formation, and generate high-temperature and high-pressure gases, thereby improving the conductivity of the oil layer.

[0066] In this embodiment, the multiple operation unit 313 applies different high-frequency pulse waves to the oil layer based on different high-frequency electrical processing commands, and has the following functions:

[0067] 1) Fracture-creating function: When a high-frequency pulse passes through the formation, it generates an electric explosion and electric shock, producing a large amount of high-temperature and high-pressure gas, reaching peak pressure within 0.1-20ms. This high loading rate leads to the formation of a radial multi-fracture system in the formation, increasing the chance of connecting natural fractures and greatly improving the conductivity of the oil layer.

[0068] 2) Water blocking and control increases oil phase permeability and reduces water phase permeability. High-frequency pulses generate high temperatures in areas with water or abundant water in the formation, causing water vaporization and pushing it to both sides. When the temperature drops, a vacuum is formed, thus blocking the water channels and preventing water seepage. Under the action of direct current, the permeability of the water phase can be reduced and the permeability of the oil phase can be increased. The permeability of the water phase decreases from 20 millidarcy to 12 millidarcy, while the permeability of the oil phase increases from 39 millidarcy to 50 millidarcy. Since water in the oil layer is positively charged, the water well is connected to the negative electrode during operation. Under the influence of the electric field, water will move towards the water well, hindering the flow of water to the oil well.

[0069] 3) Electro-driven effect: In the formation capillary, the flow rate of electroosmotic flow is proportional to the square of the capillary radius, while the flow rate of hydrodynamic flow is proportional to the fourth power of the capillary radius. Therefore, electroosmotic flow can drive fluids that cannot be driven by hydrodynamic flow, thereby increasing the production of oil wells and improving the recovery rate of oil fields.

[0070] 4) Electrochemical effect: When the applied DC electric field is greater than the electric field strength of the formation fluid, the oil layer is equivalent to a sealed electrolytic cell. The fluid in the oil layer will electrolyze and generate a large amount of gas. The energy of the gas expansion increases the oil layer pressure, thereby increasing oil production. At the same time, the expansion and diffusion of gas can remove the blockage of voids and improve the permeability of the fluid in the oil layer.

[0071] 5) The role of electroosmotic flow: According to the theory of the diffuse double layer, in water-wet formations, a double layer is formed at the interface between formation water and rock. Under the influence of an applied DC electric field, the movable layer of this double layer carries water molecules, generating electroosmotic flow that is conducive to water-driven oil production. Water carries a positive charge and moves towards the negative electrode, while oil carries a negative charge and moves towards the positive electrode. In the diffuse double layer, the number of cations moving towards the cathode in the movable layer is greater than the number of anions, carrying large molecules to the cathode and generating an additional electroosmotic flow, thereby reducing the flow capacity of the water phase. Simultaneously, the thickness of the water film on the rock surface thins, making room for oil flow. Because the oil phase surface carries a negative charge, its flow capacity towards the positive electrode increases. The electroosmotic flow in the capillary is proportional to the square of the capillary radius.

[0072] 6) Heating and viscosity reduction: The energy input into the formation, according to the law of conservation of energy, is ultimately converted into heat energy, which is highly beneficial for wax blockage and viscosity reduction of heavy oil. Simultaneously, due to the combined effects of high-frequency pulses and heat, long carbon chains are easily broken down, forming lower molecular weight carbon chains, thus reducing viscosity. This chain-breaking effect, in heavy oil fields, can break down long-chain heavy oil, making it more fluid.

[0073] In this embodiment of the invention, the high-frequency oil extraction power supply device 300 operates at a voltage of 150V, has a maximum current of 1500A, and a high-frequency pulse current loading rate ≥10. 6 V / s, and the high-frequency pulse current is 0-120V isolated high-frequency DC, ensuring that the peak pressure is reached within 0.1-20ms.

[0074] In this embodiment of the invention, a working method for an application technology device for enhanced oil recovery through electroosmotic flow is also provided. The method includes:

[0075] S10, Before starting work, set up safety barriers and safety signs in the work area;

[0076] S20: Place the equipment in a work space that is easy to move around in the well site, connect the electrical equipment, that is, set up a transformer according to the well site operation procedure, connect the safety device and switch cabinet 200, and the power supply is connected to the high frequency oil production power supply device 300 through the switch cabinet 200 and then through the cable. At the same time, connect the power supply to the water cooling equipment to ensure that the water cooling equipment can properly dissipate heat from the oil production equipment.

[0077] S30 connects the copper core flexible cable of the electrical output connection of the electro-osmotic enhanced oil production, water shut-off, oil increase and improved recovery rate application technology equipment to the wellhead. It is required that the wellhead wiring position must have good electrical contact with the casing group 500.

[0078] S40. After the operation begins, the process of one of the oil wells needs to be disconnected to prevent the backflow of electricity from affecting the current delivery to the formation reservoir area.

[0079] S50, High-Frequency Oil Production Technology Electrical Processing Equipment Operation: During operation, power is drawn from below the neutral zone of the power grid to the transformer. The combined transformer 100 converts the power to 380V AC, which is then supplied to the high-frequency oil production power supply device 300 via the switch cabinet 200. The high-frequency oil production power supply device 300 processes the 380V power into the current, voltage, frequency, etc. required for the operation, and then transmits it to the wellhead through the isolation transformer 330 and the transmission cable 400 to the oil-bearing formation. The specific time for powering on is determined based on the changes in current, voltage, and wellhead.

[0080] S60, based on the actual conditions of the well group, selects water wells and oil wells, as well as oil wells to connect DC power to the oil production equipment for operation, thereby improving the overall production of the injection and production well group.

[0081] During the operation, the operating current, voltage, and wellhead oil and casing pressure should be recorded at all times. Oil well samples should be taken before the operation, because the oil samples will change every day for the first two days. The construction team will start taking oil and water samples and conducting tests 24 hours after the operation. After 24 hours, samples will be taken every 12 hours to observe the changes in oil and water samples. Sampling will be carried out continuously for 15 days. Sampling buckets and 1000-liter measuring cups should be prepared at the operation site to detect changes in water content.

[0082] In this embodiment of the utility model, the high-frequency oil production power supply device 300 converts the 380V AC power supplied by the combined transformer 100 into special high-frequency DC power. The device is manufactured using conventional rectification, filtering, inversion and voltage regulation to obtain 0-120V (150 adjustable) DC power. The positive and negative terminals of the DC power are connected to the bushing assembly 500 (as a grounding point). Because the positive and negative terminals of the high-frequency DC power output by the equipment form a closed loop, the step voltage between the wellhead power supply and the ground is 8-28V during operation. This is a safe voltage that will not cause harm to people or objects. Even if people or livestock touch the power supply, the step voltage is too low to cause harm. Furthermore, when the high-frequency oil production power supply unit 300 outputs high-frequency electricity, it conducts energy to the oil well in the form of special electromagnetic waves, thereby playing a role in driving oil production. This electromagnetic wave has no effect on people or other equipment. The high-frequency oil production power supply unit 300 meets the GB9706 standard for power consumption. The output uses an isolation transformer 330, which can effectively isolate the input and output and has short-circuit and overcurrent protection. At the same time, the switch cabinet 200 has a protective switch. Multiple measures ensure the personal safety of personnel in the work area. The combined transformer 100 is installed by a professional electrician according to the oilfield operation specifications. The transformer is placed on a special platform, maintaining a suitable safe distance from the ground. The transformer is surrounded by an isolation fence to prevent outsiders from approaching.

[0083] After trials and applications in multiple oilfields, the oil-water mixture treated with high-frequency pulses has yielded the following series of significant and positive results: The success rate of the operation exceeds 90%. It significantly reduces the water cut of the produced fluid, averaging 10%-25%, with some wells experiencing reductions of over 50%. On average, production increases by more than double, with some wells seeing increases of 3-4 times. Water injection wells (excluding those in montmorillonite formations or highly water-sensitive formations) can be unblocked, allowing for on-demand water injection. The effective period is generally 3-6 months, but can extend to over a year in some cases. The single-well operation time is approximately 24-36 hours, with noticeable effects within 24 hours.

[0084] Therefore, the electroosmotic flow-enhanced oil recovery technology and equipment provided in this embodiment of the invention have the following advantages: simple operation, convenient operation, and easy construction. It can solve production problems on demand, such as high water content in the produced fluid, formation blockage (structural blockage or wax blockage), excessively high water injection pressure, or inability to inject water; it has strong adaptability. During operation, only two wells are needed in the same production layer; the geological personnel only need to propose the problem to be solved and the requirements, and prepare a construction plan and objective for operation; it has a wide range of applications, can handle many types of problems, has a short operation time, and can operate without interrupting production; it is environmentally friendly and pollution-free, and will not damage the formation; it does not produce any side effects or residual problems for the oil field; it can be laid out in any direction to drive areas with more remaining oil in the formation.

[0085] In summary, this utility model provides an application technology and equipment for enhanced oil recovery through electroosmotic flow, which improves oil production by blocking water and increasing oil yield. In this embodiment, a high-frequency oil production power supply device 300 is provided. As the core component of the high-frequency electroosmotic flow oil production technology, the high-frequency oil production power supply device 300 outputs high-frequency pulse electromagnetic waves of a specific frequency (≥10kHz). Through the synergistic effect of multiple mechanisms of "fracture creation, water blocking, and electrochemical unblocking" of the high-frequency pulse electromagnetic waves, it can accurately dredge unused dead oil areas, remaining oil areas, and capillary bound water areas in water injection development, expand the swept volume, and drive the water film on the rock surface to thin, creating seepage space for oil flow, significantly improving the flow capacity of the oil phase, and directly reducing the interfacial tension between oil and water. At the same time, by using electroosmotic flow to directionally drive bound water and narrow the seepage channels of the water phase, the effect of reducing water and increasing oil yield is more significant.

[0086] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0087] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of this utility model according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of this utility model. These technical solutions are also within the scope of protection of this utility model.

Claims

1. The application of electro-osmotic flow enhanced oil recovery, water plugging and oil increasing, and enhanced oil recovery technology and equipment, characterized in that, include: A combined transformer, electrically connected to a 10KV high-voltage line, is used to convert the high-voltage electricity of the 10KV high-voltage line into the voltage required for high-frequency pulse electromagnetic waves. The switchgear, electrically connected to the combined transformer, is used to control the on / off state of the circuit and provides various protections. The high-frequency oil production power supply unit is electrically connected to the switch cabinet and is used to generate and output high-frequency pulse current for oil production. A transmission cable is electrically connected to the high-frequency oil production power supply device and is used to transmit high-frequency pulse current; The casing assembly, located within the reservoir, is used to support the positive and negative electrodes and assist them in generating high-frequency pulse waves.

2. The electroosmotic flow enhanced oil recovery water plugging oil increasing recovery application technology equipment according to claim 1, characterized in that: The combined transformer includes: A high-voltage transformer is electrically connected to a 10kV high-voltage line and is used to convert the high-voltage electricity from the 10kV high-voltage line into 380V AC electricity. The low-voltage transformer is electrically connected to the high-voltage transformer and to the switch cabinet. The low-voltage transformer is used to supply power to the high-frequency oil extraction power supply unit.

3. The electroosmotic flow enhanced oil recovery water plugging oil increasing recovery application technology equipment according to claim 1, characterized in that: The sleeve assembly includes: The positive electrode bushing is installed inside the oil reservoir. A connecting positive electrode is fitted on the positive electrode bushing. The connecting positive electrode is electrically connected to the high-frequency oil production power supply device through a transmission cable. The negative electrode bushing is installed inside the oil reservoir. A connecting negative electrode is fitted on the negative electrode bushing, and the connecting negative electrode is electrically connected to the high-frequency oil production power supply device through a transmission cable.

4. The electroosmotic flow enhanced oil recovery water plugging oil increasing recovery application technology equipment according to claim 3, characterized in that: The high-frequency oil production power supply device includes: A high-frequency electrical processing main control unit is fixedly installed inside the high-frequency oil production power supply unit. A power conversion module, which is electrically connected to the high-frequency electrical processing main control, is used to convert low-voltage AC power into high-frequency pulse current. The frequency adjustment range of the power conversion module is 10kHz-1MHz. An isolation transformer is installed inside the high-frequency oil extraction power supply unit, and the isolation transformer is electrically connected to the high-frequency power processing main control unit. At least one set of isolation protectors is installed in the high-frequency oil production power supply unit. The isolation protectors are electrically connected to the high-frequency electrical processing main control unit and also electrically connected to the transmission cable.

5. The electroosmotic flow enhanced oil recovery water plugging oil increasing recovery application technology equipment according to claim 4, characterized in that: The high-frequency electrical processing main controller includes: The data acquisition unit is used to acquire and parse the high-frequency pulse current generation parameters, and generate high-frequency electrical processing instructions based on the high-frequency pulse current generation parameters. The power access unit, in response to high-frequency power processing commands, controls the combined transformer and switchgear to open, enabling the power conversion module to connect to AC power, and converts the AC power into high-frequency pulse special electromagnetic waves through rectification and frequency conversion; Multiple operating units respond to high-frequency electrical processing commands and apply different high-frequency pulse waves to the oil layer based on different high-frequency electrical processing commands. When different high-frequency pulse waves are applied to the oil layer based on different high-frequency electrical processing commands, the high-frequency pulse waves generate electric explosions and electric shocks when passing through the formation, and generate high-temperature and high-pressure gases, thereby improving the conductivity of the oil layer.

6. The electroosmotic flow enhanced oil recovery water plugging oil increasing recovery application technology equipment according to claim 5, characterized in that: The high-frequency oil production power supply unit operates at a voltage of 150V and a current of 1500A.

7. The electroosmotic flow-enhanced oil recovery technology and equipment as described in claim 3, characterized in that: The negative electrode casing is installed inside the water well, and the positive electrode casing is installed inside the oil well.

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