Shale oil underground in-situ modification method and device, electronic equipment and medium

Abstract

The invention discloses a shale oil underground in-situ modification method and device, electronic equipment and a medium. The method comprises the steps that a power source anode and a power source cathode are installed in a shaft, the power source anode is connected with a high-voltage pulse power source through a cable, and the power source cathode is connected with a grounding position; the shale oil is exploited, so that the shale oil flows into the shaft; starting a high-voltage pulse power supply, and performing pulse liquid phase discharge on shale oil in the shaft through preset discharge voltage, preset discharge frequency and preset pulse width; and shale oil in the shaft is extracted, and the viscosity reduction rate and the recovery rate of the shale oil are determined. According to the technical scheme, pulse liquid phase discharge is used for shale oil underground in-situ modification, and the viscosity reduction rate and the recovery rate of shale oil can be remarkably increased.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield development, and in particular to a method, device, electronic equipment and medium for underground in-situ reforming of shale oil. Background Art

[0002] my country is extremely short of oil resources. In recent years, domestic crude oil production has been only approximately 200 million tons, and dependence on foreign crude oil has long exceeded 70%, seriously impacting my country's energy security. Therefore, maintaining stable and increasing production has long been a critical task for domestic oil companies. Shale oil is a major strategic replacement resource for my country's oil and gas industry. If breakthroughs in core development technologies lead to efficient industrial development, it is expected to rapidly increase domestic oil production and significantly reduce dependence on foreign sources.

[0003] The total amount of medium-to-high maturity shale oil geological resources exceeds 100×10 8 t, horizontal well volume fracturing technology can be used to effectively develop, which is a realistic field of recent oil exploration; medium and low maturity shale oil resources have great potential, and the preliminary evaluation of technically recoverable resources is (700-900)×10 8 t is a strategic replacement resource for the future development of the oil industry, and requires technological breakthroughs such as in-situ conversion to achieve profitable development.

[0004] However, whether it is medium-high maturity or medium-low maturity, shale oil usually has high viscosity and poor physical and chemical properties, which makes its extraction, transportation and subsequent processing difficult. Therefore, how to further transform shale oil in situ to improve its physical and chemical properties is of great significance. Summary of the Invention

[0005] The present invention provides a method, device, electronic equipment and medium for underground in-situ modification of shale oil. Pulsed liquid phase discharge is used for underground in-situ modification of shale oil, which can significantly improve the viscosity reduction rate and recovery rate of shale oil.

[0006] According to one aspect of the present invention, a method for underground in-situ upgrading of shale oil is provided, the method comprising:

[0007] Install the positive and negative poles of the power supply in the wellbore, connect the positive pole of the power supply to the high-voltage pulse power supply and the negative pole of the power supply to the ground through cables;

[0008] Conducting the shale oil extraction process so that shale oil flows into the wellbore;

[0009] Turn on the high-voltage pulse power supply and perform pulse liquid phase discharge on the shale oil in the wellbore by using a preset discharge voltage, a preset discharge frequency, and a preset pulse width;

[0010] Produce shale oil from the wellbore and determine the viscosity reduction rate and recovery rate of shale oil.

[0011] According to another aspect of the present invention, there is provided an underground in-situ shale oil reforming device, the device comprising:

[0012] A wellbore connection module is used to install the positive and negative poles of the power supply in the wellbore, connect the positive pole of the power supply to the high-voltage pulse power supply through a cable, and connect the negative pole of the power supply to the ground;

[0013] A shale oil extraction module, which is used to carry out the shale oil extraction process and make the shale oil flow into the wellbore;

[0014] The pulse liquid phase discharge module is used to turn on the high-voltage pulse power supply and perform pulse liquid phase discharge on the shale oil in the wellbore through a preset discharge voltage, preset discharge frequency and preset pulse width;

[0015] The shale oil production module in the wellbore is used to produce shale oil in the wellbore and determine the viscosity reduction rate and recovery rate of shale oil.

[0016] According to another aspect of the present invention, an electronic device is provided, comprising:

[0017] at least one processor; and

[0018] a memory communicatively connected to the at least one processor; wherein,

[0019] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute a shale oil underground in-situ modification method described in any embodiment of the present invention.

[0020] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement a shale oil underground in-situ modification method described in any embodiment of the present invention when executed.

[0021] The technical solution of the embodiment of the present invention is to install a positive power supply and a negative power supply in a wellbore, connect the positive power supply to a high-voltage pulse power supply via a cable, and connect the negative power supply to a ground point. Then, a shale oil extraction process is carried out to allow shale oil to flow into the wellbore. The high-voltage pulse power supply is turned on, and pulsed liquid phase discharge is performed on the shale oil in the wellbore at a preset discharge voltage, preset discharge frequency, and preset pulse width. The shale oil in the wellbore is extracted and the viscosity reduction rate and recovery rate of the shale oil are determined. This technical solution uses pulsed liquid phase discharge for underground in-situ shale oil reforming, which can significantly improve the viscosity reduction rate and recovery rate of shale oil.

[0022] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a flow chart of a method for underground in-situ upgrading of shale oil provided according to Example 1 of the present invention;

[0025] Figure 2 A schematic structural diagram of an underground in-situ shale oil reforming device provided in Example 2 of the present invention;

[0026] Figure 3 It is a structural schematic diagram of an electronic device for implementing a method for underground in-situ reforming of shale oil according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] Example 1

[0030] Figure 1This is a flow chart of a method for underground in-situ upgrading of shale oil provided according to the first embodiment of the present invention. This embodiment is applicable to the case of underground in-situ upgrading of shale oil. The method can be performed by an underground in-situ upgrading device for shale oil. The underground in-situ upgrading device for shale oil can be implemented in the form of hardware and / or software. The underground in-situ upgrading device for shale oil can be configured in a device. For example, the device can be a background server or other device with communication and computing capabilities. Figure 1 As shown, the method includes:

[0031] S110. Install the positive electrode and the negative electrode of the power supply in the wellbore, connect the positive electrode of the power supply to the high-voltage pulse power supply through a cable, and connect the negative electrode of the power supply to the ground.

[0032] In this solution, the shale oil underground pulsed liquid phase discharge system includes a wellbore, a high-voltage pulsed power supply, a positive power supply terminal, a negative power supply terminal, and cables. This system performs an underground in-situ shale oil reforming method. Underground in-situ reforming involves applying surface reforming processes to underground oil formations. The physicochemical effects of pulsed liquid phase discharge improve crude oil quality, significantly increasing the recovery rate of both mobilized and unmobilized shale oil reserves.

[0033] A shaft refers to a vertical or inclined structure excavated from the ground toward an ore body during underground mining or construction. Vertical shafts are called vertical shafts, while inclined shafts are called inclined shafts. A high-voltage pulse power supply is a type of high-voltage power supply that adds a switching circuit to a high-voltage DC power supply, resulting in adjustable pulse amplitude, pulse width, pulse frequency, and pulse output number. Cable is a general term for items such as optical cables and electrical cables. Cables have many uses, primarily for controlling installations, connecting equipment, and transmitting power.

[0034] In this solution, the wellbore includes a vertical wellbore and a horizontal wellbore. Preferably, the horizontal wellbore is equipped with a positive power supply and a negative power supply to perform underground in-situ reforming of shale oil.

[0035] In this embodiment, the positive power supply and the negative power supply in the shale oil underground pulse liquid phase discharge system can be installed on the wellbore according to the installation requirements of the positive power supply and the negative power supply, and the positive power supply and the negative power supply installed in the wellbore are respectively connected to the high-voltage pulse power supply and the grounding point through cables.

[0036] S120: Perform shale oil extraction to allow shale oil to flow into the wellbore.

[0037] Among them, shale oil refers to the oil resources contained in shale formations dominated by shale, including oil in the pores and cracks of mud shale, as well as oil resources in the adjacent layers and interlayers of dense carbonate rocks or clastic rocks in the mud shale formations.

[0038] Specifically, conventional shale oil extraction technology can be used to extract shale oil, so that the shale oil flows into the wellbore.

[0039] S130, turning on the high-voltage pulse power supply, and performing pulse liquid phase discharge on the shale oil in the wellbore by using a preset discharge voltage, a preset discharge frequency, and a preset pulse width.

[0040] In this embodiment, the high-voltage pulse power supply in the shale oil underground pulsed liquid-phase discharge system can generate pulsed liquid-phase discharges on the shale oil in the wellbore. Pulsed liquid-phase discharge 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, as well as corresponding chemical reactions. It has the advantages of being environmentally friendly, significantly increasing production, and being low-cost.

[0041] Specifically, by turning on the high-voltage pulse power supply in the shale oil underground pulse liquid phase discharge system, pulse liquid phase discharge can be performed on the shale oil in the wellbore with a preset discharge voltage, preset discharge frequency and preset pulse width.

[0042] Among them, the preset discharge voltage is between 5kV and 50kV, and the discharge voltage is preferably set to 15kV (kilovolts); the preset discharge frequency is between 200Hz and 2000Hz, and the discharge frequency is preferably set to 300Hz (hertz); the preset pulse width is between 50ns and 500ns, and the pulse width is preferably set to 100ns (nanoseconds).

[0043] S140. Produce shale oil from the wellbore and determine the viscosity reduction rate and recovery rate of the shale oil.

[0044] Viscosity reduction refers to the process by which shale oil alters the molecular structure of crude oil, thereby reducing its viscosity. Recovery efficiency refers to the ratio of the amount of crude oil recovered to the original geological reserves of the reservoir, usually expressed as a percentage.

[0045] Specifically, conventional shale oil extraction technology can be used to extract shale oil from the wellbore and calculate the viscosity reduction and recovery rate of the shale oil. Using this solution's in-situ reforming, the viscosity reduction rate can be increased by 9 percentage points and the recovery rate by more than 6 percentage points, respectively.

[0046] The technical solution of the embodiment of the present invention is to install a positive power supply and a negative power supply in a wellbore, connect the positive power supply to a high-voltage pulse power supply via a cable, and connect the negative power supply to a ground point. Then, a shale oil extraction process is carried out to allow shale oil to flow into the wellbore. The high-voltage pulse power supply is turned on, and pulse liquid phase discharge is performed on the shale oil in the wellbore using a preset discharge voltage, preset discharge frequency, and preset pulse width. The shale oil in the wellbore is extracted and the viscosity reduction rate and recovery rate of the shale oil are determined. By implementing this technical solution, pulse liquid phase discharge is used for underground in-situ shale oil reforming, which can significantly improve the viscosity reduction rate and recovery rate of shale oil.

[0047] Example 2

[0048] Figure 2 This is a schematic diagram of the structure of a shale oil underground in-situ reforming device provided in Example 2 of the present invention. Figure 2 As shown, the device includes:

[0049] The wellbore connection module 210 is used to install the positive and negative electrodes of the power supply in the wellbore, connect the positive electrode of the power supply to the high-voltage pulse power supply through a cable, and connect the negative electrode of the power supply to the ground;

[0050] The shale oil production module 220 is used to carry out the shale oil production process and make the shale oil flow into the wellbore;

[0051] The pulse liquid phase discharge module 230 is used to turn on the high-voltage pulse power supply and perform pulse liquid phase discharge on the shale oil in the wellbore by using a preset discharge voltage, a preset discharge frequency, and a preset pulse width;

[0052] The shale oil production module 240 in the wellbore is used to produce the shale oil in the wellbore and determine the viscosity reduction rate and recovery rate of the shale oil.

[0053] Optionally, the wellbore includes a vertical wellbore and a horizontal wellbore.

[0054] Optionally, the preset discharge voltage ranges from 5 kV to 50 kV; the preset discharge frequency ranges from 200 Hz to 2000 Hz; and the preset pulse width ranges from 50 ns to 500 ns.

[0055] Optionally, the preset discharge voltage is set to 15 kV; the preset discharge frequency is set to 300 Hz; and the pulse width is set to 100 ns.

[0056] An underground in-situ shale oil reforming device provided in an embodiment of the present invention can execute an underground in-situ shale oil reforming method provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0057] Example 3

[0058] Figure 3 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device 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 claimed herein.

[0059] like Figure 3 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.

[0060] 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.

[0061] 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 a method for underground in-situ upgrading of shale oil.

[0062] In some embodiments, a method for underground in-situ upgrading of shale oil 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 method for underground in-situ upgrading of shale oil described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute a method for underground in-situ upgrading of shale oil by any other appropriate means (e.g., by means of firmware).

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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).

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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. A method for underground in-situ upgrading of shale oil, characterized in that: include: Install the positive and negative poles of the power supply in the wellbore, connect the positive pole of the power supply to the high-voltage pulse power supply and the negative pole of the power supply to the ground through cables; Conducting the shale oil extraction process so that shale oil flows into the wellbore; Turn on the high-voltage pulse power supply and perform pulse liquid phase discharge on the shale oil in the wellbore by using a preset discharge voltage, a preset discharge frequency, and a preset pulse width; Produce shale oil from the wellbore and determine the viscosity reduction rate and recovery rate of shale oil.

2. The method according to claim 1, characterized in that The wellbore includes a vertical wellbore and a horizontal wellbore.

3. The method according to claim 1, characterized in that The preset discharge voltage ranges from 5 kV to 50 kV; the preset discharge frequency ranges from 200 Hz to 2000 Hz; and the preset pulse width ranges from 50 ns to 500 ns.

4. The method according to claim 3, characterized in that The preset discharge voltage is set to 15 kV; the preset discharge frequency is set to 300 Hz; and the pulse width is set to 100 ns.

5. An underground in-situ shale oil reforming device, characterized in that: include: A wellbore connection module is used to install the positive and negative poles of the power supply in the wellbore, connect the positive pole of the power supply to the high-voltage pulse power supply through a cable, and connect the negative pole of the power supply to the ground; A shale oil extraction module, which is used to carry out the shale oil extraction process and make the shale oil flow into the wellbore; The pulse liquid phase discharge module is used to turn on the high-voltage pulse power supply and perform pulse liquid phase discharge on the shale oil in the wellbore through a preset discharge voltage, preset discharge frequency and preset pulse width; The shale oil production module in the wellbore is used to produce shale oil in the wellbore and determine the viscosity reduction rate and recovery rate of shale oil.

6. The device according to claim 5, characterized in that The wellbore includes a vertical wellbore and a horizontal wellbore.

7. The device according to claim 5, characterized in that The preset discharge voltage ranges from 5 kV to 50 kV; the preset discharge frequency ranges from 200 Hz to 2000 Hz; and the preset pulse width ranges from 50 ns to 500 ns.

8. The device according to claim 7, characterized in that The preset discharge voltage is set to 15 kV; the preset discharge frequency is set to 300 Hz; and the pulse width is set to 100 ns.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute a shale oil underground in-situ upgrading method as described in any one of claims 1-4.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement a shale oil underground in-situ modification method according to any one of claims 1 to 4 when executed.

Images