Oil displacement method based on cooperation of direct-current electric field and pulse liquid phase discharge

Abstract

The embodiment of the invention discloses an oil displacement method based on cooperation of a direct-current electric field and pulse liquid phase discharge. The method comprises the steps that an oil displacement system based on cooperation of a direct-current electric field and pulse liquid phase discharge is constructed; the oil displacement system comprises a water injection container, a high-pressure pump set, a direct-current power source, a direct-current power source electrode, an alternating-current power source, a high-voltage pulse power source, a high-voltage pulse power source electrode and a transmission cable. A high-pressure pump set is started in the oil displacement system, and water injected into the water container is conveyed into the injection well; a direct-current power supply is turned on, an electric field with the target potential gradient is applied between the injection well and the production well, and direct-current electric field oil displacement is conducted on crude oil in the stratum; and a high-voltage pulse power supply is turned on, and high-voltage pulse liquid-phase discharge oil displacement is conducted on crude oil in the stratum according to the target discharge voltage, the discharge frequency and the pulse width. By adopting the technical scheme of the embodiment of the invention, the oil displacement process is synergistically enhanced by the discharge coupling effect of the direct-current electric field and the pulse liquid phase, so that the recovery rate of crude oil is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of oilfield development, and in particular to an oil displacement method based on the coordination of a direct current electric field and pulsed liquid phase discharge. Background Art

[0002] Oil recovery technology that applies a direct current electric field to oil reservoirs has excellent water control and oil production enhancement effects. It also has a wide range of applications, simple processes, and low costs, making it extremely promising. Pulsed liquid phase discharge (PLD) is a high-voltage, high-current pulsed discharge process in a liquid medium. The high-speed energy conversion produces physical effects such as heat, light, force, and sound. Due to its environmental friendliness, significant production-increasing effects, and low cost, it has become a research hotspot in the field of oil and gas blockage relief and production enhancement. However, while both DC electric fields and PLD can enhance oil recovery, there is currently no oil recovery technology that couples these two methods. Summary of the Invention

[0003] Embodiments of the present invention provide an oil recovery method, device, electronic device, and storage medium based on the synergy of a DC electric field and pulsed liquid phase discharge, so as to achieve synergistic enhancement of the oil recovery process by coupling the DC electric field and pulsed liquid phase discharge, thereby improving crude oil recovery efficiency.

[0004] In a first aspect, an embodiment of the present invention provides an oil displacement method based on the synergy of a DC electric field and pulsed liquid phase discharge, comprising:

[0005] Constructing an oil displacement system based on the coordination of a DC electric field and pulsed liquid phase discharge; the oil displacement system includes an injection water container, a high-pressure pump group, a DC power supply, a DC power supply electrode, an AC power supply, a high-voltage pulse power supply, a high-voltage pulse power supply electrode, and a transmission cable;

[0006] Start the high-pressure pump group in the oil displacement system to transport the water in the injection water container to the injection well;

[0007] Turn on the DC power supply and apply an electric field with a target potential gradient between the injection well and the production well to perform DC electric field flooding on the crude oil in the formation;

[0008] The high-voltage pulse power supply is turned on to perform high-voltage pulse liquid phase discharge displacement on the crude oil in the formation at the target discharge voltage, discharge frequency and pulse width.

[0009] In a second aspect, an embodiment of the present invention further provides an oil displacement device based on the coordination of a DC electric field and pulsed liquid phase discharge, comprising:

[0010] An oil displacement system construction module is used to construct an oil displacement system based on the coordination of a DC electric field and pulsed liquid phase discharge; the oil displacement system includes an injection water container, a high-pressure pump group, a DC power supply, a DC power supply electrode, an AC power supply, a high-voltage pulse power supply, a high-voltage pulse power supply electrode, and a transmission cable;

[0011] The oil displacement water injection module starts the high-pressure pump group in the oil displacement system to transport the water in the injection water container to the injection well;

[0012] The DC electric field flooding module turns on the DC power supply and applies an electric field with a target potential gradient between the injection well and the production well to perform DC electric field flooding on the crude oil in the formation;

[0013] The high-voltage pulse liquid phase discharge oil recovery module turns on the high-voltage pulse power supply and performs high-voltage pulse liquid phase discharge oil recovery on the crude oil in the formation at the target discharge voltage, discharge frequency and pulse width.

[0014] In a third aspect, an embodiment of the present invention further provides an electronic device, the electronic device comprising:

[0015] one or more processors;

[0016] a storage device for storing one or more programs;

[0017] When the one or more programs are executed by the one or more processors, the one or more processors implement the oil recovery method based on the coordination of DC electric field and pulsed liquid phase discharge as described in any embodiment of the present invention.

[0018] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the oil displacement method based on the coordination of a DC electric field and pulsed liquid phase discharge as described in any embodiment of the present invention.

[0019] Embodiments of the present invention provide an oil recovery method, device, electronic device, and storage medium based on the synergy of a direct current electric field and pulsed liquid-phase discharge. The method constructs an oil recovery system based on the synergy of a direct current electric field and pulsed liquid-phase discharge. The oil recovery system includes an injection water container, a high-pressure pump group, a direct current power supply, a direct current power supply electrode, an alternating current power supply, a high-voltage pulse power supply electrode, and a transmission cable. The high-pressure pump group is activated in the oil recovery system to transport water from the injection water container to an injection well. The direct current power supply is activated to apply an electric field with a target potential gradient between the injection well and the production well to perform direct current electric field recovery on the crude oil in the formation. The high-voltage pulse power supply is activated to perform high-voltage pulsed liquid-phase discharge recovery on the crude oil in the formation at a target discharge voltage, discharge frequency, and pulse width. Using the technical solutions of the embodiments of the present invention, the direct current electric field and pulsed liquid-phase discharge are coupled to synergistically enhance the oil recovery process, thereby improving the crude oil recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects, and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings. The drawings are for the purpose of illustrating preferred embodiments only and are not to be considered as limiting the present invention. Like reference characters are used throughout the drawings to denote like parts. In the drawings:

[0021] Figure 1 This is a flow chart of an oil displacement method based on the coordination of a DC electric field and pulsed liquid phase discharge provided in an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the structure of an oil displacement system based on the coordination of a DC electric field and pulsed liquid phase discharge provided in an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the structure of an oil displacement device based on the coordination of a DC electric field and pulsed liquid phase discharge provided in an embodiment of the present invention;

[0024] Figure 4 It is a structural diagram of an electronic device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0026] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the various operations (or steps) as sequential processes, many of the operations (or steps) therein can be implemented in parallel, concurrently, or simultaneously. In addition, the order of the various operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0027] Among them, the acquisition, storage, use and processing of data in the technical solution of this application comply with the relevant provisions of national laws and regulations.

[0028] Figure 1This is a flow chart of an oil recovery method based on the coordination of a DC electric field and pulsed liquid phase discharge, provided in an embodiment of the present invention. This embodiment is applicable to oil recovery based on the coordination of a DC electric field and pulsed liquid phase discharge. The method of this embodiment can be performed by an oil recovery device based on the coordination of a DC electric field and pulsed liquid phase discharge, which can be implemented using hardware and / or software. The device can be configured in a server based on the coordination of a DC electric field and pulsed liquid phase discharge. The method specifically includes the following steps:

[0029] S110. Construct an oil displacement system based on the coordination of DC electric field and pulsed liquid phase discharge.

[0030] The present invention employs a system for oil recovery based on the synergistic effects of a DC electric field and pulsed liquid-phase discharge. The system includes, but is not limited to, a water injection container, a high-pressure pump assembly, a DC power supply, a DC power supply electrode, an AC power supply, a high-voltage pulse power supply, a high-voltage pulse power supply electrode, and a transmission cable. This system utilizes the coupling of a DC electric field and pulsed liquid-phase discharge to synergistically enhance the oil recovery process, significantly improving crude oil recovery.

[0031] As an optional but non-limiting implementation, the construction of an oil displacement system based on the coordination of a DC electric field and pulsed liquid phase discharge includes but is not limited to steps A1-A3:

[0032] Step A1: The high-pressure pump group is connected to the injection water container through a transmission cable to transport the water in the injection water container to the injection well.

[0033] Step A2: The high-voltage pulse power supply electrode is connected to the high-voltage pulse power supply through a transmission cable and is grounded through the cable.

[0034] Step A3: DC power supply electrodes are installed on the inner walls of the injection well and the production well to generate an electric field with a certain potential gradient; wherein a DC power supply is used to power the DC power supply electrodes.

[0035] Among them, see Figure 2 , the water in the injection water container flows into the injection well through the high-pressure pump group, and when the crude oil is flooded, the crude oil and the water in the injection water container flow into the injection wellbore. Turn on the high-voltage pulse power supply in the injection well so that the high-voltage pulse power supply electrode generates a certain discharge voltage, discharge frequency and pulse width to impact the fluid and formation in the well, thereby improving the permeability of the action area. The DC power supply electrode is installed on the inner wall of the injection well and the production well, and the DC power supply electrode is powered by a DC power supply to generate a potential gradient at the DC power supply electrode to perform DC electric field flooding on the crude oil in the formation. The potential gradient can be between 1 and 10 V / cm, preferably 8 V / cm.

[0036] As an optional but non-limiting implementation, the oil displacement system based on the coordination of DC electric field and pulsed liquid phase discharge further includes:

[0037] The location of the low permeability oil layer is determined based on the historical crude oil data, and the high-voltage pulse power supply electrode is installed at the low permeability oil layer of the injection well.

[0038] The high-voltage pulse power supply is connected to a high-voltage pulse power supply electrode installed on the inner wall of the injection well via a cable, and the high-voltage pulse power supply electrode is grounded via the cable. The location of the low-permeability oil layer is determined based on historical data of the oil field, and the high-voltage pulse power supply electrode is installed in the low-permeability oil layer of the injection well.

[0039] S120: Start the high-pressure pump group in the oil displacement system to transport the water in the injection water container to the injection well.

[0040] When the crude oil is displaced, the high-pressure pump unit is turned on to transport the water in the injection water container to the injection well.

[0041] S130 , turning on the DC power supply, applying an electric field with a target potential gradient between the injection well and the production well, and performing DC electric field flooding on the crude oil in the formation.

[0042] Among them, the target potential gradient is generated by applying a certain DC electric field voltage to the DC power supply electrode. After determining the target DC electric field voltage, the DC power supply is turned on to power the DC power supply electrode, and the corresponding target DC electric field voltage is set to apply an electric field with a target potential gradient between the injection well and the production well, so as to perform DC electric field flooding on the crude oil in the formation.

[0043] As an optional but non-limiting implementation, turning on the DC power supply and applying an electric field with a target potential gradient between the injection well and the production well to perform DC electric field flooding on the crude oil in the formation includes but is not limited to steps B1-B3:

[0044] Step B1: Determine the target potential gradient and the target distance between the injection well and the production well; wherein the potential gradient at which the crude oil recovery rate is maximum is taken as the target potential gradient.

[0045] Step B2: Determine the target DC electric field voltage based on the target potential gradient and the target distance between the injection well and the production well.

[0046] Step B3: Turn on the DC power supply and set the target DC electric field voltage, apply an electric field with a target potential gradient between the injection well and the production well, and perform DC electric field flooding on the crude oil in the formation.

[0047] The target DC electric field voltage is determined by the target potential gradient and the target distance between the injection well and the production well. The product of the target potential gradient and the target distance is used as the target DC electric field voltage. The target potential gradient is determined by examining the effect of the potential gradient on the recovery factor through indoor microscopic flooding experiments, and the potential gradient that maximizes the recovery factor is used as the target potential gradient.

[0048] After determining the target DC electric field voltage and target potential gradient, the DC power supply is turned on, the target DC electric field voltage is set, and an electric field with the target potential gradient is applied between the injection well and the production well to conduct DC electric field flooding. Due to the negative charge of the rock skeleton, cations in the water phase are concentrated in the double layer region at the surface of the pore channel. The electric field can promote the migration of cations within the double layer toward the negative electrode. The movement of cations drives the movement of water molecules, thereby increasing the seepage rate of crude oil.

[0049] In an optional solution of the embodiment of the present invention, a target DC electric field voltage is determined based on the target potential gradient and the target distance between the injection well and the production well; wherein the target DC electric field voltage can be expressed as:

[0050] Target DC electric field voltage = target potential gradient * target distance between injection well and production well

[0051] S140 , turning on the high-voltage pulse power supply, and performing high-voltage pulse liquid phase discharge displacement on the crude oil in the formation at a target discharge voltage, discharge frequency, and pulse width.

[0052] The liquid impact generated by pulsed liquid-phase discharge can, on the one hand, scour the wall, fracture the rock, remove scale near the wellbore, and increase the permeability of the low-permeability zone; on the other hand, the liquid impact can achieve the effect of fluctuating water injection, alleviating problems such as the displacement front advancing in the far-wellbore area and ineffective water injection circulation along the dominant channel. In the embodiments of the present invention, high-voltage pulsed liquid-phase discharge is used to perform high-voltage pulsed liquid-phase discharge flooding on crude oil to improve its recovery rate.

[0053] As an optional but non-limiting implementation, the high-voltage pulse power supply is turned on to perform high-voltage pulse liquid-phase discharge flooding on the crude oil in the formation at a target discharge voltage, discharge frequency, and pulse width, including but not limited to steps C1-C3:

[0054] Step C1: Determine target pulse liquid phase discharge parameters when applying a high voltage pulse to the injection well; wherein the pulse liquid phase discharge parameters include target discharge voltage, discharge frequency and pulse width, and the target pulse liquid phase discharge parameters are determined when the liquid production of the crude oil in the production well is maximum and the water content is minimum.

[0055] Step C2: Turn on the high-voltage pulse power supply in the injection well to supply power to the high-voltage pulse power supply electrode, and make the high-voltage pulse power supply electrode release the target pulse liquid phase discharge parameters.

[0056] Step C3: Using target pulse liquid phase discharge parameters to perform high-pressure pulse liquid phase discharge on the crude oil, and performing high-pressure pulse liquid phase discharge to displace the crude oil in the formation.

[0057] Wherein, the pulse liquid phase discharge parameters include but are not limited to preset discharge voltage, discharge frequency and pulse width. In an embodiment of the present invention, during the process of oil displacement of crude oil, water in the injection water container is allowed to flow into the injection well, and the target pulse liquid phase discharge parameters are determined for the crude oil in the injection well, so as to use the target pulse liquid phase discharge parameters to perform high-pressure pulse liquid phase discharge displacement on the crude oil. The liquid production and water content in the production well are monitored, and the influence of the discharge voltage, discharge frequency and pulse width on the current oil layer is investigated. The discharge voltage, discharge frequency and pulse width at which the liquid production is maximum and the water content is minimum are determined and used as the target pulse liquid phase discharge parameters. The target pulse liquid phase discharge parameters are used to perform high-pressure pulse liquid phase discharge on the crude oil, and high-pressure pulse liquid phase discharge displacement is performed on the crude oil in the formation.

[0058] Optionally, the target pulsed liquid-phase discharge parameters include, but are not limited to, discharge voltage, discharge frequency, and pulse width. The discharge voltage may range from 5 to 40 kV, preferably 15 kV; the discharge frequency may range from 100 to 1800 Hz, preferably 800 Hz; and the pulse width may range from 10 to 500 ns, preferably 100 ns.

[0059] As an optional but non-limiting implementation, the method further includes but is not limited to steps D1-D3:

[0060] Step D1: Determine the crude oil recovery rate before high-voltage pulsed liquid discharge flooding and / or direct current electric field flooding.

[0061] Step D2: Obtain crude oil in the production well after high-voltage pulse liquid discharge flooding and / or direct current electric field flooding, and determine the recovery rate of the crude oil after flooding.

[0062] Step D3: Based on the crude oil recovery rates before and after flooding, determine the target crude oil recovery rate after the synergistic flooding by the direct current electric field and high-voltage pulsed liquid discharge.

[0063] The crude oil recovery rate before and after high-voltage pulsed liquid discharge flooding and / or direct current electric field flooding is obtained to determine the target crude oil recovery rate.

[0064]

[0065] As an optional but non-limiting implementation, the method further includes:

[0066] Determining a target recovery rate for crude oil after synergistic flooding using a direct current electric field and high-voltage pulsed liquid phase discharge, and adjusting the flooding methods of the direct current electric field flooding and the high-voltage pulsed liquid phase discharge flooding according to the target recovery rate;

[0067] The oil displacement method includes adopting a direct current electric field and high-voltage pulse liquid phase discharge to perform oil displacement simultaneously, perform oil displacement intermittently or perform oil displacement alternately.

[0068] In an embodiment of the present invention, a DC electric field and a high-voltage pulsed liquid-phase discharge are synergistically coupled to displace crude oil, and the displacement method is adjusted in real time based on the target recovery rate. The displacement method includes, but is not limited to, simultaneous displacement using a DC electric field and a high-voltage pulsed liquid-phase discharge, intermittent displacement, or alternating displacement. For example, if the target recovery rate obtained by intermittent or alternating displacement using a DC electric field and a high-voltage pulsed liquid-phase discharge is less than a preset recovery rate threshold, the target recovery rate is adjusted to be displaced simultaneously using a DC electric field and a high-voltage pulsed liquid-phase discharge, the adjusted target recovery rate is re-determined, and the displacement method with the highest target recovery rate is determined to displace the crude oil.

[0069] An embodiment of the present invention provides an oil recovery method based on the synergy of a direct current electric field and pulsed liquid phase discharge. The method comprises constructing an oil recovery system based on the synergy of a direct current electric field and pulsed liquid phase discharge. The oil recovery system comprises an injection water container, a high-pressure pump group, a direct current power supply, a direct current power supply electrode, an alternating current power supply, a high-voltage pulsed power supply electrode, and a transmission cable. The high-pressure pump group is activated in the oil recovery system to transport water from the injection water container to an injection well. The direct current power supply is activated to apply an electric field with a target potential gradient between the injection well and the production well to perform direct current electric field recovery on the crude oil in the formation. The high-voltage pulsed power supply is activated to perform high-voltage pulsed liquid phase discharge recovery on the crude oil in the formation at a target discharge voltage, discharge frequency, and pulse width. Using the technical solution of the embodiment of the present invention, the direct current electric field and pulsed liquid phase discharge are coupled to synergistically enhance the oil recovery process, thereby improving the crude oil recovery rate.

[0070] Figure 3 This is a schematic diagram of the structure of an oil displacement device based on the coordination of DC electric field and pulsed liquid phase discharge provided in an embodiment of the present invention. The technical solution of this embodiment can be applied to the case of oil displacement based on the coordination of DC electric field and pulsed liquid phase discharge. The device can be implemented by software and / or hardware and is generally integrated into any electronic device with network communication function, including but not limited to: servers, computers, personal digital assistants and other devices. Figure 3As shown, the oil displacement device based on the coordination of DC electric field and pulsed liquid phase discharge provided in this embodiment may include: an oil displacement system construction module 310, an oil displacement water injection module 320, a DC electric field oil displacement module 330 and a high-voltage pulsed liquid phase discharge oil displacement module 340; wherein,

[0071] An oil displacement system construction module 310 is configured to construct an oil displacement system based on the coordination of a DC electric field and pulsed liquid phase discharge; the oil displacement system includes an injection water container, a high-pressure pump group, a DC power supply, a DC power supply electrode, an AC power supply, a high-voltage pulse power supply, a high-voltage pulse power supply electrode, and a transmission cable;

[0072] The oil displacement water injection module 320 starts the high-pressure pump group in the oil displacement system to transport the water in the injection water container to the injection well;

[0073] The DC electric field flooding module 330 turns on the DC power supply and applies an electric field with a target potential gradient between the injection well and the production well to perform DC electric field flooding on the crude oil in the formation;

[0074] The high-voltage pulse liquid phase discharge flooding module 340 turns on the high-voltage pulse power supply and performs high-voltage pulse liquid phase discharge flooding on the crude oil in the formation at a target discharge voltage, discharge frequency and pulse width.

[0075] Based on the above embodiment, optionally, the oil displacement system construction module is specifically used to:

[0076] The high-pressure pump group is connected to the injection water container through a transmission cable to transport the water in the injection water container to the injection well;

[0077] The high-voltage pulse power supply electrode is connected to the high-voltage pulse power supply through a transmission cable and is grounded through a cable;

[0078] The DC power supply electrodes are installed on the inner walls of the injection well and the production well to generate an electric field with a certain potential gradient; wherein a DC power supply is used to power the DC power supply electrodes.

[0079] Based on the above embodiment, optionally, the oil displacement system construction module is further specifically used to:

[0080] The location of the low permeability oil layer is determined based on the historical crude oil data, and the high-voltage pulse power supply electrode is installed at the low permeability oil layer of the injection well.

[0081] Based on the above embodiment, optionally, the DC electric field flooding module is specifically used to:

[0082] Determine the target potential gradient and the target distance between the injection well and the production well; wherein the potential gradient at which the crude oil recovery factor is maximum is used as the target potential gradient;

[0083] determining a target DC electric field voltage based on the target potential gradient and a target distance between the injection well and the production well;

[0084] Turn on the DC power supply and set the target DC electric field voltage, apply an electric field with a target potential gradient between the injection well and the production well, and perform DC electric field flooding on the crude oil in the formation.

[0085] Based on the above embodiment, optionally, the high-voltage pulse liquid phase discharge oil displacement module is specifically used to:

[0086] Determining target pulse liquid phase discharge parameters when applying a high voltage pulse to the injection well; wherein the pulse liquid phase discharge parameters include a target discharge voltage, a discharge frequency, and a pulse width, and the target pulse liquid phase discharge parameters are determined when the crude oil production rate of the production well is maximum and the water content is minimum;

[0087] Turning on a high-voltage pulse power supply in the injection well to supply power to the high-voltage pulse power supply electrode, and causing the high-voltage pulse power supply electrode to release target pulse liquid phase discharge parameters;

[0088] The target pulse liquid phase discharge parameters are used to perform high-pressure pulse liquid phase discharge on the crude oil, and the high-pressure pulse liquid phase discharge is used to flood the crude oil in the formation.

[0089] Based on the above embodiment, optionally, the device further includes an oil recovery factor determination module, specifically configured to:

[0090] Determine the crude oil recovery factor before high-voltage pulsed liquid discharge flooding and / or direct current electric field flooding;

[0091] Obtaining crude oil from a production well after high-voltage pulsed liquid discharge flooding and / or direct current electric field flooding, and determining the recovery factor of the crude oil after flooding;

[0092] According to the crude oil recovery factors before and after flooding, the target crude oil recovery factor after synergistic flooding by DC electric field and high-voltage pulsed liquid discharge is determined.

[0093] Based on the above embodiment, optionally, the device further includes an oil displacement mode adjustment module, specifically configured to:

[0094] Determining a target recovery rate for crude oil after synergistic flooding using a direct current electric field and high-voltage pulsed liquid phase discharge, and adjusting the flooding methods of the direct current electric field flooding and the high-voltage pulsed liquid phase discharge flooding according to the target recovery rate;

[0095] The oil displacement method includes adopting a direct current electric field and high-voltage pulse liquid phase discharge to perform oil displacement simultaneously, perform oil displacement intermittently or perform oil displacement alternately.

[0096] The oil recovery device based on the coordination of DC electric field and pulsed liquid phase discharge provided in the embodiment of the present invention can execute the oil recovery method based on the coordination of DC electric field and pulsed liquid phase discharge provided in any embodiment of the present invention mentioned above, and has the corresponding functions and beneficial effects of executing the oil recovery method based on the coordination of DC electric field and pulsed liquid phase discharge. For detailed process, please refer to the relevant operations of the oil recovery method based on the coordination of DC electric field and pulsed liquid phase discharge in the above embodiment.

[0097] Figure 4 1 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. The electronic device 10 is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0098] like Figure 4 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. Various programs and data required for the operation of the electronic device 10 can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0099] Multiple components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0100] The processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the oil displacement method based on the coordination of a DC electric field and pulsed liquid phase discharge.

[0101] In some embodiments, the oil displacement method based on the coordination of DC electric field and pulsed liquid phase discharge can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the oil displacement method based on the coordination of DC electric field and pulsed liquid phase discharge described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the oil displacement method based on the coordination of DC electric field and pulsed liquid phase discharge by any other appropriate means (for example, by means of firmware).

[0102] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0103] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0104] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0105] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0106] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0107] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0108] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0109] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An oil displacement method based on the synergy of DC electric field and pulsed liquid phase discharge, characterized in that: The method comprises: Constructing an oil displacement system based on the coordination of a DC electric field and pulsed liquid phase discharge; the oil displacement system includes an injection water container, a high-pressure pump group, a DC power supply, a DC power supply electrode, an AC power supply, a high-voltage pulse power supply, a high-voltage pulse power supply electrode, and a transmission cable; Start the high-pressure pump group in the oil displacement system to transport the water in the injection water container to the injection well; Turn on the DC power supply and apply an electric field with a target potential gradient between the injection well and the production well to perform DC electric field flooding on the crude oil in the formation; The high-voltage pulse power supply is turned on to perform high-voltage pulse liquid phase discharge displacement on the crude oil in the formation at the target discharge voltage, discharge frequency and pulse width.

2. The method according to claim 1, characterized in that The oil displacement system based on the coordination of DC electric field and pulsed liquid phase discharge comprises: The high-pressure pump group is connected to the injection water container through a transmission cable to transport the water in the injection water container to the injection well; The high-voltage pulse power supply electrode is connected to the high-voltage pulse power supply through a transmission cable and is grounded through a cable; The DC power supply electrodes are installed on the inner walls of the injection well and the production well to generate an electric field with a certain potential gradient; wherein a DC power supply is used to power the DC power supply electrodes.

3. The method according to claim 2, characterized in that The oil displacement system based on the coordination of DC electric field and pulsed liquid phase discharge also includes: The location of the low permeability oil layer is determined based on the historical crude oil data, and the high-voltage pulse power supply electrode is installed at the low permeability oil layer of the injection well.

4. The method according to claim 1, wherein The method of turning on the DC power supply and applying an electric field with a target potential gradient between the injection well and the production well to perform DC electric field flooding on the crude oil in the formation includes: Determine the target potential gradient and the target distance between the injection well and the production well; wherein the potential gradient at which the crude oil recovery factor is maximum is used as the target potential gradient; determining a target DC electric field voltage based on the target potential gradient and a target distance between the injection well and the production well; Turn on the DC power supply and set the target DC electric field voltage, apply an electric field with a target potential gradient between the injection well and the production well, and perform DC electric field flooding on the crude oil in the formation.

5. The method according to claim 1, wherein The method of turning on the high-voltage pulse power supply and performing high-voltage pulse liquid-phase discharge flooding on the crude oil in the formation at a target discharge voltage, discharge frequency, and pulse width includes: Determining target pulse liquid phase discharge parameters when applying a high voltage pulse to the injection well; wherein the pulse liquid phase discharge parameters include a target discharge voltage, a discharge frequency, and a pulse width, and the target pulse liquid phase discharge parameters are determined when the crude oil production rate of the production well is maximum and the water content is minimum; Turning on a high-voltage pulse power supply in the injection well to supply power to the high-voltage pulse power supply electrode, and causing the high-voltage pulse power supply electrode to release target pulse liquid phase discharge parameters; The target pulse liquid phase discharge parameters are used to perform high-pressure pulse liquid phase discharge on the crude oil, and the high-pressure pulse liquid phase discharge is used to flood the crude oil in the formation.

6. The method according to claim 1, characterized in that The method further comprises: Determine the crude oil recovery factor before high-voltage pulsed liquid discharge flooding and / or direct current electric field flooding; Obtaining crude oil from a production well after high-voltage pulsed liquid discharge flooding and / or direct current electric field flooding, and determining the recovery factor of the crude oil after flooding; According to the crude oil recovery factors before and after flooding, the target crude oil recovery factor after synergistic flooding by DC electric field and high-voltage pulsed liquid discharge is determined.

7. The method according to claim 6, characterized in that The method further comprises: Determining a target recovery rate for crude oil after synergistic flooding using a direct current electric field and high-voltage pulsed liquid phase discharge, and adjusting the flooding methods of the direct current electric field flooding and the high-voltage pulsed liquid phase discharge flooding according to the target recovery rate; The oil displacement method includes adopting a direct current electric field and high-voltage pulse liquid phase discharge to perform oil displacement simultaneously, perform oil displacement intermittently or perform oil displacement alternately.

8. An oil displacement device based on the coordination of DC electric field and pulsed liquid phase discharge, characterized in that: The device comprises: An oil displacement system construction module is used to construct an oil displacement system based on the coordination of a DC electric field and pulsed liquid phase discharge; the oil displacement system includes an injection water container, a high-pressure pump group, a DC power supply, a DC power supply electrode, an AC power supply, a high-voltage pulse power supply, a high-voltage pulse power supply electrode, and a transmission cable; The oil displacement water injection module starts the high-pressure pump group in the oil displacement system to transport the water in the injection water container to the injection well; The DC electric field flooding module turns on the DC power supply and applies an electric field with a target potential gradient between the injection well and the production well to perform DC electric field flooding on the crude oil in the formation; The high-voltage pulse liquid phase discharge oil recovery module turns on the high-voltage pulse power supply and performs high-voltage pulse liquid phase discharge oil recovery on the crude oil in the formation at the target discharge voltage, discharge frequency and pulse width.

9. An electronic device, characterized in that: include: one or more processors; a storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the oil recovery method based on the coordination of DC electric field and pulsed liquid phase discharge as described in any one of claims 1-7.

10. A storage medium containing computer-executable instructions, characterized in that: When executed by a computer processor, the computer executable instructions are used to execute the oil displacement method based on the coordination of direct current electric field and pulsed liquid phase discharge as described in any one of claims 1 to 7.

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