Core fluid saturation method and device, electronic equipment and readable medium

Abstract

The invention discloses a rock core fluid saturation method and device, electronic equipment and a readable medium. The method comprises the following steps: pretreating a rock core, placing the pretreated rock core in an intermediate container, and adding a fluid into the intermediate container; vacuumizing the intermediate container containing the rock core and the fluid; carrying out high-pressure saturation, detecting the concentration of carbon dioxide until the concentration is kept unchanged, and carrying out nuclear magnetic detection to obtain a first fluid saturation degree; injecting excessive carbon dioxide to carry out high-pressure saturation, detecting the concentration of the carbon dioxide until the concentration is kept unchanged, and carrying out nuclear magnetic detection to obtain a second fluid saturation degree; and determining whether the difference between the first fluid saturation and the second fluid saturation meets a preset saturation condition, if not, executing high-pressure saturation, detecting the concentration of carbon dioxide until the concentration is kept unchanged, and performing nuclear magnetic detection to obtain the first fluid saturation. The problem that unconventional reservoir fluid is difficult to inject is solved, and the oil / water saturation is effectively increased.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield development, and in particular to a core fluid saturation method, device, electronic equipment and readable medium. Background Art

[0002] Unconventional oil reservoirs have attracted great attention from the oil industry around the world due to their huge reserves. However, due to the extremely low microscopic pore size (usually at the nanometer level) and high pore-throat ratio (>100) of this type of oil and gas resources, conventional water injection development is difficult to meet the development needs of this type of oil reservoir. The huge oil-water flow resistance makes injection difficult, and the formation energy is difficult to replenish in time, which further leads to low oil well production capacity and rapid decline, which is the so-called "no injection, no production". The research on unconventional reservoirs is mainly indoors, and the study of fluid seepage laws is imminent, among which reservoir saturated fluid is a prerequisite.

[0003] At present, the fluid saturation method for this type of reservoir still adopts conventional methods, which has the problem of difficulty in injecting fluid into unconventional reservoirs. Summary of the invention

[0004] The present invention provides a core fluid saturation method, device, electronic equipment and readable medium to solve the problem of difficult injection of unconventional reservoir fluids, improve the storage capacity of fluids in porous media, and effectively increase oil / water saturation.

[0005] According to one aspect of the present invention, there is provided a core fluid saturation method, comprising:

[0006] Pre-treating the core, placing the pre-treated core in an intermediate container and adding fluid into the intermediate container;

[0007] evacuating the intermediate container containing the core and the fluid;

[0008] Perform high-pressure saturation and detect the carbon dioxide concentration until the concentration remains constant, perform nuclear magnetic resonance detection, and obtain the first fluid saturation;

[0009] Inject excess carbon dioxide for high-pressure saturation and detect the carbon dioxide concentration until the concentration remains constant, perform nuclear magnetic resonance detection, and obtain the second fluid saturation;

[0010] Determine whether the difference between the first fluid saturation and the second fluid saturation meets the preset saturation condition. If not, perform high-pressure saturation and detect the carbon dioxide concentration until the concentration remains unchanged, perform nuclear magnetic resonance detection, and obtain the first fluid saturation.

[0011] Optionally, the pre-processing of the core includes:

[0012] Wash the core with oil and dry it for 24 hours;

[0013] The length and diameter of the core are measured, and dry scanning is performed by nuclear magnetic resonance.

[0014] Optionally, before evacuating the intermediate container containing the core and the fluid, the process further includes: performing a routine venting test to confirm whether the intermediate container is full of fluid.

[0015] Optionally, the step of evacuating the intermediate container containing the core and the fluid comprises:

[0016] The intermediate container containing the core and the fluid was evacuated by a vacuum pump for 48 hours.

[0017] Optionally, the high-pressure saturation includes: setting the pressure to the formation pressure, and performing high-pressure saturation for 48 hours.

[0018] Optionally, the injecting of excess carbon dioxide for high-pressure saturation includes: injecting excess carbon dioxide by constant pressure injection, with the pressure set to the formation pressure, and performing high-pressure saturation for 48 hours.

[0019] Optionally, determining whether the difference between the first fluid saturation and the second fluid saturation meets a preset saturation condition includes:

[0020] A determination is made as to whether a difference between the first fluid saturation and the second fluid saturation is less than 1%.

[0021] According to another aspect of the present invention, there is provided a core fluid saturation device, comprising:

[0022] A pretreatment unit, used for pretreatment of the core, placing the pretreated core in an intermediate container and adding fluid into the intermediate container;

[0023] a vacuum processing unit for evacuating the intermediate container containing the core and the fluid;

[0024] A first detection unit is used to perform high-pressure saturation and detect the carbon dioxide concentration until the concentration remains constant, and perform nuclear magnetic resonance detection to obtain a first fluid saturation;

[0025] The second detection unit is used to inject excess carbon dioxide for high-pressure saturation and detect the carbon dioxide concentration until the concentration remains constant, and perform nuclear magnetic resonance detection to obtain the second fluid saturation;

[0026] The saturation determination unit is used to determine whether the difference between the saturation of the first fluid and the saturation of the second fluid meets the preset saturation condition. If not, perform the high-pressure saturation and detect the carbon dioxide concentration until the concentration remains unchanged, perform nuclear magnetic resonance detection, and obtain the saturation of the first fluid.

[0027] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0028] At least one processor; and a memory in communication with the at least one processor; wherein the memory stores a computer program executable 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 the core fluid saturation method described in any embodiment of the present invention.

[0029] 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 implement the core fluid saturation method described in any embodiment of the present invention when executed by a processor.

[0030] The technical solution of the embodiment of the present invention is to pre-treat the core, place the pre-treated core in an intermediate container and add fluid to the intermediate container; evacuate the intermediate container containing the core and the fluid; perform high-pressure saturation and detect the carbon dioxide concentration until the concentration remains unchanged, perform nuclear magnetic resonance detection, and obtain the first fluid saturation; inject excess carbon dioxide for high-pressure saturation and detect the carbon dioxide concentration until the concentration remains unchanged, perform nuclear magnetic resonance detection, and obtain the second fluid saturation; determine whether the difference between the first fluid saturation and the second fluid saturation meets the preset saturation condition, if not, perform high-pressure saturation and detect the carbon dioxide concentration until the concentration remains unchanged, perform nuclear magnetic resonance detection, and obtain the first fluid saturation. The present invention not only solves the problem of "difficult injection" of unconventional reservoir fluids, but also improves the storage capacity of fluids, effectively increases oil / water saturation, and ensures the smooth progress of indoor research on unconventional oil reservoirs.

[0031] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 This is a flow chart of a core fluid saturation method provided in Example 1 of the present invention;

[0034] Figure 2 is a schematic diagram of a device for performing a core fluid saturation method applicable to Embodiment 1 of the present invention;

[0035] Figure 3 It is a structural schematic diagram of a core fluid saturation device provided in Embodiment 3 of the present invention;

[0036] Figure 4 It is a schematic diagram of the structure of an electronic device for implementing the core fluid saturation method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the specification 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 data 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 that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] Embodiment 1

[0040] Figure 1This is a flow chart of a core fluid saturation method provided in Example 1 of the present invention. This embodiment is applicable to the case where the storage capacity of fluid in porous media is improved. The method can be performed by a core fluid saturation device, which can be implemented in the form of hardware and / or software. Figure 1 As shown, the method includes:

[0041] S110, pre-treating the core, placing the pre-treated core in an intermediate container and adding fluid into the intermediate container.

[0042] In an embodiment of the present invention, the pretreatment of the core includes: washing the core with oil and drying it for 24 hours; measuring the length and diameter of the core, and performing dry scanning by nuclear magnetic resonance.

[0043] S120, evacuating the intermediate container containing the core and the fluid.

[0044] In an embodiment of the present invention, the vacuuming the intermediate container containing the core and the fluid comprises: vacuuming the intermediate container containing the core and the fluid by means of a vacuum pump for 48 hours.

[0045] In an embodiment of the present invention, before evacuating the intermediate container containing the core and the fluid, the process further includes: performing a conventional venting test to confirm whether the intermediate container is full of fluid.

[0046] S130, perform high-pressure saturation and detect the carbon dioxide concentration until the concentration remains constant, perform nuclear magnetic resonance detection, and obtain the first fluid saturation.

[0047] In the embodiment of the present invention, the high-pressure saturation includes: setting the pressure to the formation pressure, and performing the high-pressure saturation for 48 hours.

[0048] S140, injecting excess carbon dioxide for high-pressure saturation and detecting the carbon dioxide concentration until the concentration remains constant, performing nuclear magnetic resonance detection, and obtaining the second fluid saturation.

[0049] In an embodiment of the present invention, the injecting of excess carbon dioxide for high-pressure saturation includes: injecting excess carbon dioxide by constant pressure injection, with the pressure set to the formation pressure, and performing high-pressure saturation for 48 hours.

[0050] S150, determining whether the difference between the first fluid saturation and the second fluid saturation meets a preset saturation condition, if not, executing the high-pressure saturation and detecting the carbon dioxide concentration until the concentration remains unchanged, performing nuclear magnetic resonance detection, and obtaining the first fluid saturation.

[0051] In an embodiment of the present invention, determining whether the difference between the first fluid saturation and the second fluid saturation meets a preset saturation condition includes: determining whether the difference between the first fluid saturation and the second fluid saturation is less than 1%.

[0052] Figure 2 Schematic diagram of a device for performing a core fluid saturation method applicable to the first embodiment of the present invention. The experimental process method of the device includes the following steps:

[0053] Step 1: Wash the core with oil, dry it for 24 hours, measure the length and diameter of the core, and use high-precision nuclear magnetic resonance for dry scanning;

[0054] Step 2: Perform NMR detection on the fluid used, adjust the parameters to achieve the best effect, and record the NMR signal value;

[0055] Step 3: Follow Figure 1 Set up the process, take out the core and place it in the middle container, add appropriate amount of fluid (oil / water);

[0056] Step 4: Perform routine venting tests to ensure that the pipelines, valves and pistons are filled with fluid;

[0057] Step 5: Turn on the vacuum pump and evacuate the intermediate container containing the core and fluid for 48 hours;

[0058] Step 6: Set the pressure to the formation pressure, perform high pressure saturation for 48 hours, and test the carbon dioxide concentration until the concentration remains constant, and perform nuclear magnetic resonance testing;

[0059] Step 7: Inject excess carbon dioxide by constant pressure injection, set the pressure to the formation pressure, perform high pressure saturation for 48 hours, and test the carbon dioxide concentration until the concentration remains constant, and perform nuclear magnetic resonance testing;

[0060] Step 8: Repeat steps 5 to 7 until the measured fluid saturation differs by less than 1%.

[0061] Example 1:

[0062] The experiment was conducted using dense sandstone with a permeability of 0.06 mD, a length of 3 cm, and a diameter of 2.5 cm. The experimental oil was simulated water from the Daqing formation, the formation pressure was 25 MPa, and the experimental period was 7 days.

[0063] After the experiment, the water saturation was 41% after conventional high-pressure saturation. After the use of this patent, the water saturation was 52%, an increase of 11 percentage points.

[0064] Example 2:

[0065] The experiment was conducted using Xinjiang shale with a permeability of 0.025 mD, a length of 7 cm, and a diameter of 2.5 cm. The experimental oil was degassed crude oil from the Mahu Ma 131 well, the formation pressure was 18 MPa, and the experimental period was 7 days.

[0066] After the experiment, the oil saturation was 27% after conventional high-pressure saturation. After the use of this patent, the oil saturation was 35%, an increase of 8 percentage points.

[0067] At present, the research on unconventional oil reservoirs is mainly indoors, among which the research on fluid seepage laws is imminent, among which reservoir saturated fluid is a prerequisite, and conventional saturated fluid methods are no longer applicable to unconventional samples. At present, the fluid saturation method for this type of reservoir still adopts conventional methods, and there is an urgent need to develop a "targeted" fluid saturation method. The present invention combines the high-pressure saturation method and the mechanism that carbon dioxide is easily soluble in water, so that the fluid can enter the pores in both directions, effectively solving the problem of "difficult injection and incomplete injection" of unconventional reservoirs; in addition, the present invention uses carbon dioxide as the gas medium, and the solution formed after dissolving in water has little change in the overall pH, and will not cause acid-sensitive damage to the reservoir. The solubility of the gas medium causes local negative pressure to form in the pores, which promotes the entry of fluids into the pores and increases the fluid saturation in the reservoir. The innovation of this technology lies in:

[0068] (1) Indoor saturated fluid experiments show that when carbon dioxide is used as the gas medium, the solubility of carbon dioxide causes local negative pressure to form in the pores, which promotes the entry of fluid into the pores, further increasing the fluid saturation by 5% to 8% on the basis of high-pressure saturation;

[0069] (2) The present invention uses carbon dioxide as the gas medium, and the solution formed after dissolving in water changes the overall pH value between 0.3 and 0.5, and the impact on the reservoir can be ignored;

[0070] (3) The saturated fluid method provided by the present invention provides important technical support for indoor research on unconventional oil reservoirs.

[0071] Embodiment 2

[0072] Figure 3 It is a structural schematic diagram of a core fluid saturation device provided in Example 3 of the present invention.

[0073] like Figure 3 As shown, the device comprises:

[0074] A pretreatment unit 310 is used to pretreat the core, place the pretreated core in an intermediate container and add fluid into the intermediate container;

[0075] A vacuum processing unit 320, used for evacuating the intermediate container containing the core and the fluid;

[0076] The first detection unit 330 is used to perform high-pressure saturation and detect the carbon dioxide concentration until the concentration remains constant, and perform nuclear magnetic resonance detection to obtain the first fluid saturation;

[0077] The second detection unit 340 is used to inject excess carbon dioxide for high-pressure saturation and detect the carbon dioxide concentration until the concentration remains constant, and perform nuclear magnetic resonance detection to obtain the second fluid saturation;

[0078] The saturation determination unit 350 is used to determine whether the difference between the saturation of the first fluid and the saturation of the second fluid meets the preset saturation condition. If not, high-pressure saturation is performed and the carbon dioxide concentration is detected until the concentration remains unchanged, and nuclear magnetic resonance detection is performed to obtain the saturation of the first fluid.

[0079] Optionally, the preprocessing unit 310, when performing the preprocessing of the core, specifically performs:

[0080] Wash the core with oil and dry it for 24 hours;

[0081] The length and diameter of the core are measured, and dry scanning is performed by nuclear magnetic resonance.

[0082] Optionally, the vacuum processing unit 320 is further used to perform a conventional venting test to confirm whether the intermediate container containing the core and the fluid is full before performing the vacuuming of the intermediate container.

[0083] Optionally, the vacuum processing unit 320 is used to perform:

[0084] The intermediate container containing the core and the fluid was evacuated by a vacuum pump for 48 hours.

[0085] Optionally, when performing the high-pressure saturation, the first detection unit 330 specifically performs: setting the pressure to the formation pressure, and performing the high-pressure saturation for 48 hours.

[0086] Optionally, when the second detection unit 340 performs the injection of excess carbon dioxide for high-pressure saturation, specifically performs: injecting excess carbon dioxide by constant pressure injection, setting the pressure to the formation pressure, and performing high-pressure saturation for 48 hours.

[0087] Optionally, the saturation determination unit 350, when performing the determination of whether the difference between the first fluid saturation and the second fluid saturation meets a preset saturation condition, specifically performs:

[0088] A determination is made as to whether a difference between the first fluid saturation and the second fluid saturation is less than 1%.

[0089] The core fluid saturation device provided in the embodiment of the present invention can execute the core fluid saturation method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0090] Embodiment 3

[0091] Figure 4 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 required herein.

[0092] like Figure 4 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and 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 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0093] A number of 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 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 through a computer network such as the Internet and / or various telecommunication networks.

[0094] The processor 11 may be a variety of general and / or special processing components 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 dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the core fluid saturation method.

[0095] In some embodiments, the core fluid saturation method may 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 may 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 core fluid saturation method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the core fluid saturation method in any other suitable manner (e.g., by means of firmware).

[0096] Various implementations 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 chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including 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.

[0097] 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, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0098] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0099] To provide interaction with a user, the systems and techniques described herein may 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 a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0100] The systems and techniques described herein may be implemented in a computing system that includes backend 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 frontend components (e.g., a user computer with a graphical user interface or a 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 backend components, middleware components, or frontend components. The components of the system may 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.

[0101] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0102] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0103] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A core fluid saturation method, characterized in that: include: Pre-treating the core, placing the pre-treated core in an intermediate container and adding fluid into the intermediate container; evacuating the intermediate container containing the core and the fluid; Perform high-pressure saturation and detect the carbon dioxide concentration until the concentration remains constant, perform nuclear magnetic resonance detection, and obtain the first fluid saturation; Inject excess carbon dioxide for high-pressure saturation and detect the carbon dioxide concentration until the concentration remains constant, perform nuclear magnetic resonance detection, and obtain the second fluid saturation; Determine whether the difference between the first fluid saturation and the second fluid saturation meets the preset saturation condition. If not, perform high-pressure saturation and detect the carbon dioxide concentration until the concentration remains unchanged, perform nuclear magnetic resonance detection, and obtain the first fluid saturation.

2. The method according to claim 1, characterized in that The pretreatment of the core comprises: Wash the core with oil and dry it for 24 hours; The length and diameter of the core are measured, and dry scanning is performed by nuclear magnetic resonance.

3. The method according to claim 1, characterized in that Before evacuating the intermediate container containing the core and the fluid, the method further includes: performing a conventional venting test to confirm whether the intermediate container is full of fluid.

4. The method according to claim 1, characterized in that: The step of evacuating the intermediate container containing the core and the fluid comprises: The intermediate container containing the core and the fluid was evacuated by a vacuum pump for 48 hours.

5. The method according to claim 1, characterized in that The high-pressure saturation comprises: setting the pressure to the formation pressure, and performing the high-pressure saturation for 48 hours.

6. The method according to claim 1, characterized in that The injecting of excess carbon dioxide for high-pressure saturation includes: injecting excess carbon dioxide by constant pressure injection, setting the pressure to the formation pressure, and performing high-pressure saturation for 48 hours.

7. The method according to claim 1, characterized in that The determining whether the difference between the first fluid saturation and the second fluid saturation meets a preset saturation condition includes: A determination is made as to whether a difference between the first fluid saturation and the second fluid saturation is less than 1%.

8. Core fluid saturation device, characterized in that: include: A pretreatment unit, used for pretreatment of the core, placing the pretreated core in an intermediate container and adding fluid into the intermediate container; a vacuum processing unit for evacuating the intermediate container containing the core and the fluid; A first detection unit is used to perform high-pressure saturation and detect the carbon dioxide concentration until the concentration remains constant, and perform nuclear magnetic resonance detection to obtain a first fluid saturation; The second detection unit is used to inject excess carbon dioxide for high-pressure saturation and detect the carbon dioxide concentration until the concentration remains constant, and perform nuclear magnetic resonance detection to obtain the second fluid saturation; The saturation determination unit is used to determine whether the difference between the saturation of the first fluid and the saturation of the second fluid meets the preset saturation condition. If not, perform the high-pressure saturation and detect the carbon dioxide concentration until the concentration remains unchanged, perform nuclear magnetic resonance detection, and obtain the saturation of the first fluid.

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 executable by the at least one processor, the computer program being executed by the at least one processor so that the at least one processor can perform the core fluid saturation method according to any one of claims 1 to 7.

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 the core fluid saturation method according to any one of claims 1 to 7 when executed.

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