Rock sample water vapor calibration method and device, electronic equipment and readable medium

Abstract

The invention discloses a rock sample water vapor calibration method and device, electronic equipment and a readable medium. The method comprises the following steps: calibrating first water content in a rock core of a rock sample subjected to conventional rock core treatment; taking out the rock core, placing the rock core in a rock core holder, opening a constant-temperature box, raising the temperature to a preset temperature, and checking the air tightness of the process; constant-speed or constant-pressure water drive is conducted, after the pressure or the flow speed is stable, the permeability is determined, nuclear magnetic detection is conducted, and the second water content is calibrated; determining the water vapor content of the rock core according to the first water content and the second water content; and repeatedly calibrating the second water content, determining a plurality of water vapor contents according to the second water content and the first water content, and completing calibration when the plurality of water vapor contents meet a preset condition. On the basis of the rock sample, the high-resolution nuclear magnetic resonance technology is adopted, the rock sample water vapor is measured under different temperature conditions, and further development of indoor rock core basic experiments is promoted.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield development, and in particular to a rock sample water vapor calibration method, a device, an electronic device and a readable medium. Background Art

[0002] High-water-content sandstone oilfields account for the bulk of my country's oil reserves and production. 37.7% of the geological reserves of my country's continental sandstone oilfields are in the ultra-high water-content development stage, and another 38.3% of the geological reserves are in the high water-content period. These reserves will also enter the ultra-high water-content development stage one after another.

[0003] In the ultra-high water content stage, there is still a considerable amount of geological reserves trapped underground, and the contradictions between layers, within layers, and on the plane are more prominent, and the phenomenon of inefficient and ineffective water injection is serious. The underground seepage field is constantly changing, the water vapor distribution is becoming more and more complex, and it is difficult to adjust the water saturation. Therefore, in indoor simulation research, water saturation is one of the important parameters for studying the seepage law of reservoirs, so it is particularly important to accurately characterize this parameter.

[0004] In summary, a method is needed to accurately calibrate water saturation. Summary of the invention

[0005] The present invention provides a rock sample water vapor calibration method, device, electronic equipment and readable medium, which can accurately calibrate water saturation.

[0006] According to one aspect of the present invention, a rock sample water vapor calibration method is provided, comprising:

[0007] Calibrate the first water content in the core of the rock sample after conventional core treatment;

[0008] Take out the core and place it in the core holder, turn on the thermostat to raise the temperature to the preset temperature, and check the process air tightness;

[0009] Carry out constant speed or constant pressure water drive, and after the pressure or flow rate is stable, determine the permeability, conduct nuclear magnetic resonance testing, and calibrate the second water content;

[0010] determining a water vapor content of the core according to the first water content and the second water content;

[0011] The second water content is repeatedly calibrated and a plurality of water vapor contents are determined together with the first water content, and the calibration is completed when the plurality of water vapor contents meet a preset condition.

[0012] Optionally, the conventional core processing includes:

[0013] The core is washed with oil and dried for 24 hours;

[0014] Measure the length and diameter of the core and use nuclear magnetic resonance for dry scanning;

[0015] The core holder containing the core was evacuated by a vacuum pump for 48 hours and saturated with water for 48 hours.

[0016] Optionally, determining the water vapor content of the core according to the first water content and the second water content includes:

[0017] Determining the difference between the first water content and the second water content determines the water vapor content of the core.

[0018] Optionally, the preset condition is that the difference between the multiple water vapor contents does not exceed 1%.

[0019] According to another aspect of the present invention, a rock sample water vapor calibration device is provided, comprising:

[0020] A first calibration unit, used for calibrating a first water content in a core of a rock sample after conventional core processing;

[0021] The heating unit is used to take out the core and place it in the core holder, open the thermostat to heat it to the preset temperature, and check the process air tightness;

[0022] The second calibration unit is used to perform constant speed or constant pressure water drive, determine the permeability after the pressure or flow rate is stable, perform nuclear magnetic resonance detection, and calibrate the second water content;

[0023] a water vapor content determination unit, configured to determine the water vapor content of the core according to the first water content and the second water content;

[0024] The third calibration unit is used to repeatedly calibrate the second water content and determine a plurality of the water vapor contents together with the first water content, and complete the calibration when the plurality of the water vapor contents meet a preset condition.

[0025] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0026] 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, and the computer program is executed by the at least one processor so that the at least one processor can execute the rock sample water vapor calibration method described in any embodiment of the present invention.

[0027] 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 the rock sample water vapor calibration method described in any embodiment of the present invention when executed.

[0028] The technical solution of the embodiment of the present invention is to calibrate the first water content in the core of the rock sample after conventional core treatment; take out the core and place it in the core holder, open the constant temperature box to heat it to the preset temperature, and check the air tightness of the process; perform constant speed or constant pressure water drive, and after the pressure or flow rate is stable, determine the permeability, perform nuclear magnetic resonance detection, and calibrate the second water content; determine the water vapor content of the core according to the first water content and the second water content; repeatedly calibrate the second water content and determine multiple water vapor contents with the first water content, and complete the calibration when the multiple water vapor contents meet the preset conditions. The present invention uses high-resolution nuclear magnetic resonance technology based on rock samples to achieve the determination of rock sample water vapor under different temperature conditions, and promote the further development of indoor core basic experiments.

[0029] 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

[0030] 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.

[0031] Figure 1 This is a flow chart of a rock sample water vapor calibration method provided in Example 1 of the present invention;

[0032] Figure 2 is a schematic diagram of a water vapor content experimental device applicable to Example 1 of the present invention;

[0033] Figure 3 It is a structural schematic diagram of a rock sample water vapor calibration device provided in the second embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of an electronic device for implementing the rock sample water vapor calibration method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] High-water-content sandstone oilfields are the main body of my country's oil reserves and production, and shoulder the important mission of maintaining national energy strategic security and supporting economic development. 37.7% of the geological reserves (11.4 billion tons) of my country's continental sandstone oilfields are in the stage of ultra-high water content development, and another 38.3% of the geological reserves (11.6 billion tons) are in the high water content period. These reserves will also enter the ultra-high water content development stage one after another.

[0038] In the ultra-high water content stage, there is still a considerable amount of geological reserves trapped underground, and the contradictions between layers, within layers, and on the plane are more prominent, and the phenomenon of inefficient and ineffective water injection is serious. The underground seepage field is constantly changing, the distribution of water vapor is becoming more and more complex, and it is difficult to adjust the water saturation. Therefore, in indoor simulation research, water saturation is one of the important parameters for studying the seepage law of reservoirs, so it is particularly important to accurately characterize this parameter.

[0039] Embodiment 1

[0040] Figure 1 It is a flow chart of a rock sample water vapor calibration method provided in Example 1 of the present invention. This embodiment is applicable to the case of measuring rock sample water vapor. The method can be executed by a rock sample water vapor calibration device, and the rock sample water vapor calibration device can be implemented in the form of hardware and / or software.

[0041] like Figure 1 As shown, the method includes:

[0042] S110, calibrating the first water content in the core of the rock sample after conventional core treatment.

[0043] The first water content refers to the water content under saturation.

[0044] In an embodiment of the present invention, the conventional core processing includes:

[0045] The core is washed with oil and dried for 24 hours;

[0046] Measure the length and diameter of the core and use nuclear magnetic resonance for dry scanning;

[0047] The core holder containing the core was evacuated by a vacuum pump for 48 hours and saturated with water for 48 hours.

[0048] S120. Take out the core and place it in the core holder, turn on the constant temperature box to heat it to the preset temperature, and check the air tightness of the process.

[0049] S130, performing constant speed or constant pressure water drive, after the pressure or flow rate is stable, determining the permeability, performing nuclear magnetic resonance testing, and calibrating the second water content.

[0050] The second water content refers to the water content after the water flooding is completed.

[0051] S140. Determine the water vapor content of the core according to the first water content and the second water content.

[0052] In an embodiment of the present invention, determining the water vapor content of the core according to the first water content and the second water content includes: determining the water vapor content of the core by determining the difference between the first water content and the second water content.

[0053] S150, repeatedly calibrating the second water content and determining a plurality of the water vapor contents together with the first water content, and completing the calibration when the plurality of the water vapor contents meet a preset condition.

[0054] In the embodiment of the present invention, the preset condition is that the difference between the multiple water vapor contents does not exceed 1%.

[0055] Water saturation is one of the important parameters for studying reservoir seepage laws, so it is particularly important to accurately characterize this parameter. Under formation conditions, part of the water exists in the form of water vapor, which interferes with the determination of water saturation to a certain extent. The present invention uses high-resolution nuclear magnetic resonance technology based on rock samples to achieve the determination of water vapor in rock samples under different temperature conditions, promoting the further development of indoor core basic experiments.

[0056] Figure 2 This is a schematic diagram of a water vapor content experimental device applicable to the first embodiment of the present invention. The steps of the experimental process method of the technical solution provided by the embodiment of the present invention in the experimental device are as follows:

[0057] 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;

[0058] Step 2: Turn on the vacuum pump, evacuate the core holder containing the core for 48 hours, saturate it with water for 48 hours, and perform nuclear magnetic resonance testing to calibrate the water content in the core;

[0059] Step 3: Clean the device and follow the Figure 1 Set up the process, take out the core and place it in the core holder, open the thermostat to heat it to the temperature required for the experiment, and check the air tightness of the process;

[0060] Step 4: Carry out constant speed / constant pressure water flooding according to the fluid injection rate on site. After the pressure / flow rate is stable, calculate the outlet water permeability, perform nuclear magnetic resonance testing, and calibrate the liquid water content;

[0061] Step 5: Subtract the liquid water content in step 4 from the water content in step 2 to get the water vapor content in the core;

[0062] Step 6: Repeat steps 4 to 5 until the measured water vapor content differs by less than 1%, and then end the experiment.

[0063] Based on the working principle of nuclear magnetic resonance, it can accurately identify solids and liquids containing H ions, but cannot capture gaseous states. By taking multiple measurements and combining mathematical operations, it is possible to completely and precisely quantify the water vapor content of rock samples under formation conditions and at different stages, which is of great significance for indoor physical simulation experimental research and understanding of reservoir seepage laws.

[0064] Example 1:

[0065] The experiment was conducted using sandstone with a permeability of 50 mD, a length of 6 cm, and a diameter of 2.5 cm. The experimental water used was simulated water from the Daqing formation. The experimental temperature was 60°C, the injection rate was 0.1 mL / min, the experimental ring pressure was 5 MPa, and the experimental period was 4 days.

[0066] After the experiment, when the pressure stabilized, the water saturation was measured to be 65% by conventional weighing method. After the release using this scheme, the water saturation was 60%, with water vapor accounting for 5%.

[0067] Example 2:

[0068] The experiment was conducted using sandstone with a permeability of 50 mD, a length of 6 cm, and a diameter of 2.5 cm. The experimental water used was simulated water from the Daqing formation. The experimental temperature was 80°C, the injection rate was 0.1 mL / min, the experimental ring pressure was 5 MPa, and the experimental period was 4 days.

[0069] After the experiment, when the pressure stabilized, the water saturation was measured to be 71% by conventional weighing method. After the release using this scheme, the water saturation was 60%, and the water vapor accounted for 11%.

[0070] The present invention is based on the working principle of nuclear magnetic resonance and can accurately identify solids and liquids containing H ions, but cannot capture the gaseous state. By using multiple measurements combined with mathematical operations, the water vapor content of rock samples under formation conditions and at different stages can be fully and precisely quantified, which is of great significance for indoor physical simulation experimental research and understanding of reservoir seepage laws.

[0071] Embodiment 2

[0072] Figure 3 Schematic diagram of the structure of a rock sample water vapor calibration device provided in the second embodiment of the present invention. Figure 3 As shown, the device comprises:

[0073] A first calibration unit 310, used to calibrate the first water content in the core of the rock sample after conventional core processing;

[0074] The heating unit 320 is used to take out the core and place it in the core holder, open the constant temperature box to heat it to a preset temperature, and check the process air tightness;

[0075] The second calibration unit 330 is used to perform constant speed or constant pressure water flooding, determine the permeability after the pressure or flow rate is stabilized, perform nuclear magnetic resonance testing, and calibrate the second water content;

[0076] a water vapor content determination unit 340, configured to determine the water vapor content of the core according to the first water content and the second water content;

[0077] The third calibration unit 350 is used to repeatedly calibrate the second water content and determine a plurality of water vapor contents together with the first water content, and complete the calibration when the plurality of water vapor contents meet a preset condition.

[0078] Optionally, the conventional core processing includes:

[0079] The core is washed with oil and dried for 24 hours;

[0080] Measure the length and diameter of the core and use nuclear magnetic resonance for dry scanning;

[0081] The core holder containing the core was evacuated by a vacuum pump for 48 hours and saturated with water for 48 hours.

[0082] Optionally, the water vapor content determination unit 340 is configured to perform:

[0083] Determining the difference between the first water content and the second water content determines the water vapor content of the core.

[0084] Optionally, the preset condition is that the difference between the multiple water vapor contents does not exceed 1%.

[0085] The rock sample water vapor calibration device provided in the embodiment of the present invention can execute the rock sample water vapor calibration method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0086] Embodiment 3

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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 special 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 rock sample water vapor calibration method.

[0091] In some embodiments, the rock sample water vapor calibration method 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 rock sample water vapor calibration method described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the rock sample water vapor calibration method in any other appropriate manner (for example, by means of firmware).

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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).

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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 rock sample water vapor calibration method, characterized in that: include: Calibrate the first water content in the core of the rock sample after conventional core treatment; Take out the core and place it in the core holder, turn on the thermostat to raise the temperature to the preset temperature, and check the process air tightness; Carry out constant speed or constant pressure water drive, and after the pressure or flow rate is stable, determine the permeability, conduct nuclear magnetic resonance testing, and calibrate the second water content; determining a water vapor content of the core according to the first water content and the second water content; The second water content is repeatedly calibrated and a plurality of water vapor contents are determined together with the first water content, and the calibration is completed when the plurality of water vapor contents meet a preset condition.

2. The method according to claim 1, characterized in that The conventional core processing includes: Wash the core with oil and dry it for 24 hours; Measure the length and diameter of the core and use nuclear magnetic resonance for dry scanning; The core holder containing the core was evacuated by a vacuum pump for 48 hours and saturated with water for 48 hours.

3. The method according to claim 1, characterized in that The step of determining the water vapor content of the core according to the first water content and the second water content includes: Determining the difference between the first water content and the second water content determines the water vapor content of the core.

4. The method according to claim 1, characterized in that: The preset condition is that the difference between the multiple water vapor contents does not exceed 1%.

5. Rock sample water vapor calibration device, characterized in that: include: A first calibration unit, used for calibrating a first water content in a core of a rock sample after conventional core processing; The heating unit is used to take out the core and place it in the core holder, open the thermostat to heat it to the preset temperature, and check the process air tightness; The second calibration unit is used to perform constant speed or constant pressure water drive, determine the permeability after the pressure or flow rate is stable, perform nuclear magnetic resonance detection, and calibrate the second water content; a water vapor content determination unit, configured to determine the water vapor content of the core according to the first water content and the second water content; The third calibration unit is used to repeatedly calibrate the second water content and determine a plurality of the water vapor contents together with the first water content, and complete the calibration when the plurality of the water vapor contents meet a preset condition.

6. 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, and the computer program is executed by the at least one processor so that the at least one processor can execute the rock sample water vapor calibration method described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to implement the rock sample water vapor calibration method according to any one of claims 1 to 4 when executed by a processor.

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