Double-well vertical three-dimensional displacement development method and device, electronic equipment and medium

Abstract

The invention discloses a double-well vertical three-dimensional displacement development method and device, electronic equipment and a medium. The method comprises the steps that drilling is conducted in a target shale oil reservoir in the minimum principal stress direction, drilling is conducted through an injection well along the lower end of the top of the reservoir, drilling is conducted through a producing well along the upper end of the bottom of the reservoir, and a vertically-parallel injection well and producing well combination is built; the injection well and the oil producing well are subjected to reservoir transformation in a large-section single-cluster fracturing mode; the maximum injection rate is adopted for injection well control, and the maximum air-oil ratio is adopted for oil production well control, so that vertical three-dimensional inter-well carbon dioxide injection displacement development is achieved. According to the technical scheme, the sweep efficiency of the carbon dioxide in the compact shale oil reservoir can be remarkably improved, high-level formation energy is kept by continuously injecting the carbon dioxide, the situation that the oil production speed is greatly decreased due to pressure failure is prevented, meanwhile, the gravity differentiation effect is exerted, a relatively stable displacement front is formed, and the gas channeling occurrence time is effectively delayed.

Description

Technical Field

[0001] This invention relates to the field of crude oil extraction technology, and in particular to a method, apparatus, electronic equipment, and medium for vertical displacement development using dual water wells. Background Technology

[0002] my country possesses abundant continental shale oil resources, and efficient shale oil development is a practical way to ensure national energy security. The application of horizontal wells and hydraulic fracturing technologies has enabled the initial economic development of shale oil. However, compared to North American marine shale oil reservoirs, my country's continental shale oil reservoirs have unfavorable characteristics such as low gas-oil ratios, low pressure coefficients, high solid organic matter content, and complex reservoir microstructures. Currently, shale oil reservoir development is characterized by rapid L-shaped production declines and faces the problem of recovery rates below 10%. Therefore, there is an urgent need to develop enhanced oil recovery technologies for continental shale oil. Carbon dioxide has advantages such as easy miscibility with crude oil, expansion, viscosity reduction, and the ability to penetrate tight reservoirs. Injecting carbon dioxide can ensure that formation energy remains at a high level for a long period and can effectively utilize the crude oil in the pores of the tight matrix of shale reservoirs, showing potential for improving shale oil recovery. Domestic and international laboratory experiments and numerical simulation analyses have fully verified the feasibility of carbon dioxide injection development in improving shale oil recovery.

[0003] Existing shale oil reservoir development methods suffer from the following drawbacks: Shale oil development primarily relies on single-well depletion extraction, facing problems such as rapid formation depletion, rapid production decline, and low recovery rates; Enhanced oil recovery (EOR) methods for shale oil mainly rely on single-well huff and puff, generally suffering from complex construction processes, long cycles, and low effective gas injection coverage; Fracture displacement methods in shale reservoirs are limited by the development level of natural fractures, resulting in complex inter-well fracture connections and difficulty in addressing issues such as early gas channeling, uneven displacement coverage, and high levels of residual oil between wells. Therefore, there is an urgent need to update EOR technologies and implement three-dimensional inter-well displacement based on horizontal wells to improve shale oil recovery.

[0004] To address this issue, some existing technologies enhance shale oil recovery through methods such as horizontal well multi-well planar fracture-to-plane carbon dioxide injection displacement, carbon dioxide huff and puff, and displacement. For example, a method and apparatus for horizontal well multi-well planar fracture-to-plane carbon dioxide injection for shale oil production improves inter-well displacement to inter-fracture displacement, utilizing channels formed by open natural fractures to achieve uniform carbon dioxide displacement and improve carbon dioxide flooding efficiency. However, shale reservoirs have extremely uneven natural fracture development, and displacement relying on natural fractures is prone to gas channeling, weakening the area injection-to-plane effect in improving recovery. Another method for enhancing shale oil recovery using well group carbon dioxide huff and puff involves a three-well group. Initially, gas injection is performed in the middle well, with the two side wells producing normally. After this fails, gas injection is performed in the middle well from the two side wells, and multiple rounds of displacement are repeated. This method is complex to operate. Shale reservoirs exhibit strong heterogeneity along the wellbore direction, making it impossible to establish criteria for judging injection failure and the timing of multiple displacement transitions. Furthermore, there is no method to improve gas displacement sweep efficiency after gas channeling. Summary of the Invention

[0005] This invention provides a method, apparatus, electronic equipment, and medium for vertical three-dimensional displacement development using dual water wells. It can significantly improve the sweep efficiency of carbon dioxide in tight shale oil reservoirs. Continuous carbon dioxide injection maintains a high level of formation energy to prevent pressure depletion from causing a sharp decline in oil production rate. At the same time, it plays a role in gravity differentiation, forming a relatively stable displacement front, effectively delaying the occurrence of gas channeling. This solves the problems of low sweep efficiency and low ultimate recovery rate in conventional planar gas injection development of shale oil reservoirs.

[0006] According to one aspect of the present invention, a method for vertical displacement development using two water wells is provided, the method comprising:

[0007] Drill along the direction of minimum principal stress in the target shale oil reservoir, with injection wells drilled along the lower end of the top of the reservoir and production wells drilled along the upper end of the bottom of the reservoir, establishing a vertically parallel combination of injection and production wells.

[0008] Large-segment single-cluster fracturing method is used to stimulate the reservoir in injection wells and production wells;

[0009] The injection wells are controlled using the maximum injection volume, while the production wells are controlled using the maximum gas-oil ratio, in order to achieve vertical three-dimensional inter-well carbon dioxide injection displacement development.

[0010] According to another aspect of the present invention, a dual-well vertical displacement development apparatus is provided, the apparatus comprising:

[0011] The drilling module is used to drill along the direction of minimum principal stress in the target shale oil reservoir. The injection well is drilled along the lower end of the top of the reservoir, and the production well is drilled along the upper end of the bottom of the reservoir, establishing a vertically parallel combination of injection wells and production wells.

[0012] The fracturing module is used to perform reservoir stimulation on injection wells and production wells using a large-section single-cluster fracturing method.

[0013] The displacement module is used to control the injection well with the maximum injection volume and the production well with the maximum gas-oil ratio, so as to realize vertical three-dimensional inter-well carbon dioxide displacement development.

[0014] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0015] At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the dual-well vertical displacement development method according to any embodiment of the present invention.

[0016] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the dual-well vertical displacement development method according to any embodiment of the present invention.

[0017] The technical solution of this invention involves drilling along the direction of minimum principal stress in the target shale oil reservoir. Injection wells are drilled along the lower end of the reservoir top, and production wells are drilled along the upper end of the reservoir bottom, establishing a vertically parallel combination of injection and production wells. Large-section single-cluster fracturing is used to stimulate the reservoir using these wells. The injection wells are controlled with maximum injection volume, and the production wells with maximum gas-oil ratio, achieving vertical, three-dimensional inter-well carbon dioxide injection for displacement development. This technical solution significantly improves the sweep efficiency of carbon dioxide in tight shale oil reservoirs. Continuous carbon dioxide injection maintains high formation energy levels, preventing pressure depletion and a sharp decline in oil production rate. Simultaneously, it leverages gravity differentiation to form a relatively stable displacement front, effectively delaying gas channeling and solving the problems of low sweep efficiency and low ultimate recovery in conventional planar gas injection development of shale oil reservoirs.

[0018] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of the dual-well vertical three-dimensional displacement development method provided in Embodiment 1 of the present invention;

[0021] Figure 2 This is a schematic diagram of the location of the two horizontal wells, the distribution of hydraulic fractures, and the displacement process along the horizontal well direction provided in Embodiment 1 of this application;

[0022] Figure 3 This is an oil production curve data diagram provided in Embodiment 1 of this application;

[0023] Figure 4 This is a data graph of the recovery rate provided in Embodiment 1 of this application;

[0024] Figure 5 This is a schematic diagram of the structure of the dual-well vertical three-dimensional displacement development device provided in Embodiment 2 of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of an electronic device for implementing the dual-well vertical three-dimensional displacement development method of this invention. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] Example 1

[0029] Figure 1 This is a flowchart of a dual-well vertical displacement development method according to Embodiment 1 of the present invention. This embodiment is applicable to the displacement development of shale oil reservoirs. The method can be executed by a dual-well vertical displacement development device, which can be implemented in hardware and / or software and can be configured within an equipment. For example, the equipment can be a backend server or other device with communication and computing capabilities. Figure 1 As shown, the method includes:

[0030] S110. Drill wells along the direction of minimum principal stress in the target shale oil reservoir. Drill injection wells along the lower end of the top of the reservoir and production wells along the upper end of the bottom of the reservoir to establish a vertically parallel combination of injection wells and production wells.

[0031] In this plan, the well group includes one injection well and one production well. Figure 2 This is a schematic diagram of the location of the two horizontal wells, the distribution of hydraulic fractures, and the displacement process along the horizontal well direction provided in Embodiment 1 of this application, as shown in the figure. Figure 2 As shown, drilling is carried out along the direction of minimum principal stress in the target shale oil reservoir. Injection wells are drilled along the lower end of the top of the reservoir, and production wells are drilled along the upper end of the bottom of the reservoir, establishing a vertically parallel combination of injection and production wells.

[0032] The injection well and the production well are vertically parallel, with the injection well located above the production well and close to the upper part of the reservoir. The production well is close to the lower part of the reservoir. Horizontal wells are drilled along the direction of minimum principal stress. The location of the horizontal wells needs to take into account both feasibility and economy, so that the two horizontal wells can connect the shale oil enrichment area in the reservoir as much as possible.

[0033] S120: Large-segment single-cluster fracturing method is used to stimulate the reservoir in injection wells and production wells.

[0034] Furthermore, the dual-horizontal-well staggered fracturing involves post-drilling reservoir stimulation of two horizontal wells using a large-section single-cluster fracturing method. The injection well perforates downwards, creating a vertical fracture perpendicular to the horizontal well direction after fracturing; the production well perforates upwards, also creating a vertical fracture perpendicular to the horizontal well direction after fracturing. The fracture half-length, width, height, and spacing are optimized. Specifically, the injection well perforates downwards, creating a vertical fracture perpendicular to the horizontal well direction with a downward-extending height that does not reach the production well. The production well perforates upwards, creating a vertical fracture perpendicular to the horizontal well direction with an upward-extending height that does not reach the injection well.

[0035] S130 injection wells are controlled using the maximum injection volume, while production wells are controlled using the maximum gas-oil ratio, in order to achieve vertical three-dimensional inter-well carbon dioxide injection displacement development.

[0036] The maximum injection volume and maximum gasoline ratio can be set according to the displacement development requirements.

[0037] In this scheme, inter-well gas injection displacement involves controlling the injection volume in the upper injection wells using the maximum injection rate and controlling the gas-oil ratio in the lower production wells. When the injection volume in the injection wells exceeds the set maximum threshold, carbon dioxide injection is maintained at the set maximum injection rate. When the gas-oil ratio in the production wells exceeds the set maximum threshold, the lower production wells are shut down. After injection and production, carbon dioxide enters the reservoir through hydraulic fractures in the upper injection wells, and crude oil is produced through hydraulic fractures in the lower production wells, forming a three-dimensional displacement system between the injection well fractures and the production well fractures in the shale oil reservoir.

[0038] In this process, carbon dioxide enters the reservoir through hydraulic fractures from the upper injection well, while crude oil is produced through hydraulic fractures in the lower production well. Utilizing gas molecule diffusion and displacement pressure gradients, the injected carbon dioxide allows difficult-to-recover oil in the shale matrix to enter highly permeable channels within the fractures. This achieves greater impact on the shale oil reservoir and delays gas channeling, forming a three-dimensional displacement system between the hydraulic fractures of the injection well and the production well in the shale oil reservoir. The injection rate of the injection well, the production rate of the production well, the gas-oil ratio, and the final critical minimum production rate are optimized.

[0039] In this embodiment, Figure 3 This is an oil production curve data graph provided in Embodiment 1 of this application. Figure 4 This is a data graph of the recovery rate provided in Embodiment 1 of this application, such as... Figure 3 and Figure 4 As shown, compared with historical data on the same reservoir depletion development method, after the implementation of this scheme, the average daily oil production over 15 years increased from 23.96 m³ / h. 3 Rising to 79.5m 3The projected recovery rate increased from less than 10% to 20.8% over 15 years. This scheme reduces the well-clogging stage in the injection-production mode, simplifies the operation process, and achieves a relatively stable injection-production-displacement development model for shale oil reservoirs. It can be seen that the carbon dioxide injection dual-horizontal well vertical displacement development model can effectively maintain formation energy. An effective displacement system is formed between the injection well and the production well by optimizing injection and production parameters. The measures are effective, maximizing the potential of difficult-to-extract shale oil between wells and improving the final recovery rate.

[0040] Specifically, such as Figure 2 As shown, this embodiment selects a shale oil reservoir, with a single well controlling an area of ​​0.75 km². 2 The reservoir has a burial depth of 2197m-2242m, an average porosity of 10.3%, a permeability of 0.01-0.1mD, an original formation pressure of 34.2MPa, and crude oil viscosity of 0.8mPa·s and density of 0.78g / cm³. 3 This includes the following steps:

[0041] S1: Conduct dual horizontal well drilling: A pair of wells includes one injection well and one production well. Both the injection and production wells are located in the shale oil reservoir. Horizontal wells are drilled along the direction perpendicular to the minimum principal stress. The injection well is located above the production well, 5m from the upper part of the reservoir, and the production well is 5m from the lower part of the reservoir. The length of the horizontal wells is 2500m. The location of the horizontal wells needs to comprehensively consider the geological sweet spot and engineering sweet spot of the reservoir. Under the premise of meeting feasibility, economy, and efficiency, the dual horizontal wells should connect the shale oil enrichment area in the reservoir as much as possible.

[0042] S2: Dual Horizontal Well Misaligned Fracture Stimulation: Two horizontal wells are stimulated using a large-section single-cluster fracturing method. Hydraulic fractures are installed in both the injection and production wells. The injection well has downward perforations, resulting in vertical fractures perpendicular to the horizontal well direction with a height of 15m and a spacing of 100m along the horizontal well direction. The production well has upward perforations, also resulting in vertical fractures perpendicular to the horizontal well direction with a height of 15m and a spacing of 100m. Furthermore, key fracture parameters, such as fracture length, width, and height, can be optimized and selected based on reservoir geological parameters.

[0043] S3: Vertical Inter-well Displacement: A maximum carbon dioxide injection rate of 25,000 m³ is controlled in the upper injection well. 3 / d, the lower oil production wells adopt a maximum production rate of 20m / d. 3By controlling the process, when the gas-oil ratio in the produced well exceeds a set threshold, the well is shut in. Under the diffusion of gas molecules and pressure waves, carbon dioxide is injected, allowing the difficult-to-recover oil in the crude oil matrix to enter the high-permeability channels of the fractures. This achieves greater impact of carbon dioxide injection on the shale oil reservoir and reduces gas channeling. After injection and production, carbon dioxide enters the reservoir from the hydraulic fractures of the upper injection well, while crude oil is produced from the hydraulic fractures of the lower production well, forming a three-dimensional displacement system between the injection well fractures and the production well fractures in the shale oil reservoir.

[0044] The technical solution of this invention involves drilling along the direction of minimum principal stress in the target shale oil reservoir. Injection wells are drilled along the lower end of the reservoir top, and production wells are drilled along the upper end of the reservoir bottom, establishing a vertically parallel combination of injection and production wells. Large-section single-cluster fracturing is used to stimulate the reservoir in both injection and production wells. The injection wells are controlled using the maximum injection rate, while the production wells are controlled using the maximum gas-oil ratio, achieving vertically integrated carbon dioxide injection displacement development. By implementing this technical solution, firstly, the problems of rapid production decline and low recovery rate in traditional single-horizontal-well depletion development of shale oil reservoirs are solved; secondly, the vertical displacement of dual-horizontal-wells utilizes gravity differentiation to cause gas to accumulate upwards to form a gas cap, while crude oil accumulates downwards for easier extraction, forming a relatively stable displacement front and effectively delaying the occurrence of gas channeling during injection displacement; finally, by optimizing injection and production parameters, a development model for continuous carbon dioxide injection and sustained oil production in shale oil reservoirs is established, simplifying the operation process. By utilizing the dual-horizontal-well vertical displacement development mode, formation energy can be maintained at a high level during development dynamics. Reasonable optimization of injection and production parameters can effectively prevent gas channeling, expand carbon dioxide impact on shale matrix efficiency, and improve oil production rate and ultimate recovery rate.

[0045] Example 2

[0046] Figure 5 This is a schematic diagram of the structure of the dual-well vertical displacement development device provided in Embodiment 2 of the present invention. Figure 5 As shown, the device includes:

[0047] Drilling module 510 is used to drill in the target shale oil reservoir along the direction of minimum principal stress. The injection well is drilled along the lower end of the top of the reservoir, and the production well is drilled along the upper end of the bottom of the reservoir, establishing a vertically parallel combination of injection wells and production wells.

[0048] The fracturing module 520 is used to perform reservoir stimulation on injection wells and production wells using a large-section single-cluster fracturing method.

[0049] The displacement module 530 is used to control the injection well with the maximum injection volume and the production well with the maximum gas-oil ratio, so as to realize vertical three-dimensional inter-well carbon dioxide displacement development.

[0050] Optional, fracturing module 520, specifically used for:

[0051] The injection well perforation direction is downward, and after fracturing, a vertical fracture is generated perpendicular to the horizontal well direction. The fracture height extends downward and does not reach the production well.

[0052] Optionally, the fracturing module 520 is also used for:

[0053] The perforation direction of the oil well is upward, and after fracturing, a vertical fracture is generated that is perpendicular to the direction of the horizontal well. The fracture height extends upward and does not reach the injection well.

[0054] Optional, the displacement module 530 is specifically used for:

[0055] When the injection volume of the injection well exceeds the preset maximum threshold, the maximum injection volume of carbon dioxide is maintained. When the gas-oil ratio of the production well exceeds the preset maximum threshold, the lower production well is shut down.

[0056] After injection and production, carbon dioxide enters the reservoir from the hydraulic fractures of the upper injection well, while crude oil is produced from the hydraulic fractures of the lower production well, forming a three-dimensional displacement system between the injection well fractures and the production well fractures in the shale oil reservoir.

[0057] The dual-well vertical displacement development device provided in this embodiment of the invention can execute the dual-well vertical displacement development method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0058] Example 3

[0059] Figure 6 A schematic diagram of an electronic device 10 that can be used to implement embodiments 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 processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0060] like Figure 6As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0061] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0062] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the dual-well vertical displacement development method.

[0063] In some embodiments, the dual-well vertical displacement development method can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the dual-well vertical displacement development method described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the dual-well vertical displacement development method by any other suitable means (e.g., by means of firmware).

[0064] Various embodiments of the systems and techniques described above 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), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0065] Computer programs used to implement 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 executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0066] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0067] 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 provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, 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 sound input, voice input, or tactile input).

[0068] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0069] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0070] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0071] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A dual-well vertical three-dimensional displacement development method, characterized in that, include: Drill along the direction of minimum principal stress in the target shale oil reservoir, with injection wells drilled along the lower end of the top of the reservoir and production wells drilled along the upper end of the bottom of the reservoir, establishing a vertically parallel combination of injection and production wells. Large-segment single-cluster fracturing method is used to stimulate the reservoir in injection wells and production wells; The injection wells are controlled using the maximum injection volume, while the production wells are controlled using the maximum gas-oil ratio, in order to achieve vertical three-dimensional inter-well carbon dioxide injection displacement development.

2. The method according to claim 1, characterized in that, Reservoir stimulation in injection wells is carried out using a large-section single-cluster fracturing method, including: The injection well perforation direction is downward, and after fracturing, a vertical fracture is generated perpendicular to the horizontal well direction. The fracture height extends downward and does not reach the production well.

3. The method according to claim 1, characterized in that, Reservoir stimulation in oil wells is carried out using a large-section single-cluster fracturing method, including: The perforation direction of the oil well is upward, and after fracturing, a vertical fracture is generated that is perpendicular to the direction of the horizontal well. The fracture height extends upward and does not reach the injection well.

4. The method according to claim 1, characterized in that, Injection wells are controlled using the maximum injection rate, while production wells are controlled using the maximum gas-oil ratio, including: When the injection volume of the injection well exceeds the preset maximum threshold, the maximum injection volume of carbon dioxide is maintained. When the gas-oil ratio of the production well exceeds the preset maximum threshold, the lower production well is shut down. After injection and production, carbon dioxide enters the reservoir from the hydraulic fractures of the upper injection well, while crude oil is produced from the hydraulic fractures of the lower production well, forming a three-dimensional displacement system between the injection well fractures and the production well fractures in the shale oil reservoir.

5. A dual-well vertical displacement development device, characterized in that, include: The drilling module is used to drill along the direction of minimum principal stress in the target shale oil reservoir. The injection well is drilled along the lower end of the top of the reservoir, and the production well is drilled along the upper end of the bottom of the reservoir, establishing a vertically parallel combination of injection wells and production wells. The fracturing module is used to perform reservoir stimulation on injection wells and production wells using a large-section single-cluster fracturing method. The displacement module is used to control the injection well with the maximum injection volume and the production well with the maximum gas-oil ratio, so as to realize vertical three-dimensional inter-well carbon dioxide displacement development.

6. The apparatus according to claim 5, characterized in that, Fracturing module, specifically used for: The injection well perforation direction is downward, and after fracturing, a vertical fracture is generated perpendicular to the horizontal well direction. The fracture height extends downward and does not reach the production well.

7. The apparatus according to claim 5, characterized in that, The fracturing module is also used for: The perforation direction of the oil well is upward, and after fracturing, a vertical fracture is generated that is perpendicular to the direction of the horizontal well. The fracture height extends upward and does not reach the injection well.

8. The apparatus according to claim 5, characterized in that, The displacement module is specifically used for: When the injection volume of the injection well exceeds the preset maximum threshold, the maximum injection volume of carbon dioxide is maintained. When the gas-oil ratio of the production well exceeds the preset maximum threshold, the lower production well is shut down. After injection and production, carbon dioxide enters the reservoir from the hydraulic fractures of the upper injection well, while crude oil is produced from the hydraulic fractures of the lower production well, forming a three-dimensional displacement system between the injection well fractures and the production well fractures in the shale oil reservoir.

9. An electronic device, characterized in that, The electronic device includes: At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the dual-well vertical displacement development method according to any one of claims 1-4.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the dual-well vertical displacement development method according to any one of claims 1-4.

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