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

Abstract

The application discloses a rock sample water vapor calibration method and device, electronic equipment and readable medium. The method comprises the following steps: calibrating the first water content in the core of the rock sample after conventional core treatment; taking out the core and placing it in a core holder, opening the thermostat to heat to a preset temperature, and checking the process airtightness; performing constant-speed or constant-pressure water drive, determining the permeability after the pressure or flow rate is stable, performing nuclear magnetic detection, and calibrating the second water content; determining the water vapor content of the core according to the first water content and the second water content; repeating the calibration of the second water content and the first water content to determine a plurality of water vapor contents, and completing the calibration when the plurality of water vapor contents meet the preset condition. The application realizes the determination of the water vapor of the rock sample under different temperature conditions based on the high-resolution nuclear magnetic resonance technology of the rock sample, and promotes the further development of the indoor core basic experiment.

Description

TECHNICAL FIELD

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

[0002] High water cut sandstone oilfields are the main body of China's oil reserves and production. 37.7% of the geological reserves of China's continental sandstone oilfields are in the ultra-high water cut development stage, and another 38.3% of the geological reserves are in the high water cut stage. These reserves will also enter the ultra-high water cut development stage in turn.

[0003] There are still nearly equivalent scale of geological reserves remaining in the ground at the ultra-high water cut stage, and the interlayer, intralayer and plane contradictions are more prominent, and the inefficient and ineffective water injection phenomenon is serious. The underground seepage field is constantly changing, and the water vapor distribution is becoming more and more complex, making it difficult to adjust the water saturation. Therefore, in the indoor simulation research, the water saturation is one of the important parameters for studying the reservoir seepage law, so it is particularly important to accurately depict this parameter

[0004] In view of the above, a way is needed to accurately calibrate the water saturation. SUMMARY

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

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

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

[0008] The core is taken out and placed in a core holder, the incubator is turned on to a preset temperature, and the process airtightness is checked;

[0009] Constant speed or constant pressure water drive is performed, and after the pressure or flow rate is stabilized, the permeability is determined, nuclear magnetic detection is performed, and the second water content is calibrated;

[0010] The water vapor content of the core is determined 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 according to 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 treatment comprises:

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

[0014] The length and diameter of the core are measured, and nuclear magnetic dry scanning treatment is performed;

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

[0016] Optionally, the water vapor content of the core is determined according to the first water content and the second water content, comprising:

[0017] The difference between the first water content and the second water content is determined as the water vapor content of the core.

[0018] Optionally, the preset condition is that the difference between the plurality of water vapor contents is not more than 1%.

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

[0020] A first calibration unit is configured to calibrate a first water content in a core of a rock sample after conventional core processing;

[0021] A heating unit is configured to take out the core and place it in a core holder, open a thermostat to heat to a preset temperature, and check the process airtightness;

[0022] A second calibration unit is configured to perform constant-speed or constant-pressure water flooding, determine permeability when the pressure or flow rate is stable, perform nuclear magnetic detection, and calibrate a second water content;

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

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

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

[0026] at least one processor; and a memory connected to the at least one processor in communication; 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 to enable the at least one processor to execute the rock sample water vapor calibration method according to any one of the embodiments of the present application.

[0027] According to another aspect of the present application, there is provided a computer readable storage medium storing computer instructions for causing a processor to execute the rock sample water vapor calibration method according to any one of the embodiments of the present application.

[0028] The technical scheme of the embodiment of the present application calibrates the first water content in the core of the rock sample after the conventional core treatment; the core is taken out and placed in a core holder, a thermostat is opened to heat to a preset temperature, and the process airtightness is checked; constant-speed or constant-pressure water flooding is carried out, the permeability is determined after the pressure or flow rate is stabilized, nuclear magnetic detection is carried out, and the second water content is calibrated; the water vapor content of the core is determined 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 according to the first water content, and the calibration is completed when the plurality of water vapor contents meet a preset condition. The present application realizes the determination of the water vapor of the rock sample under different temperature conditions based on the rock sample and the high-resolution nuclear magnetic resonance technology, and promotes the further development of the indoor core basic experiment.

[0029] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 is a flow chart of a rock sample water vapor calibration method provided by the first embodiment of the present application;

[0032] Figure 2 is a schematic diagram of a water vapor content experimental device suitable for the first embodiment of the present application;

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

[0034] Figure 4 is a structural schematic diagram of an electronic device for implementing the rock sample water vapor calibration method of the present application. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0036] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, unless the context otherwise requires. The use of the terms "first", "second" and other such

[0037] High water cut sandstone oilfield is the main body of China's oil reserves and production, shoulder the important mission of maintaining national energy security and supporting economic development. China's continental sandstone oilfield has 37.7% of geological reserves (11.4 billion tons) in the ultra-high water development stage, and another 38.3% of geological reserves (11.6 billion tons) in the high water stage. These reserves will also enter the ultra-high water development stage in turn.

[0038] There are still nearly equivalent size of geological reserves in the ultra-high water stage, and the interlayer, intralayer and plane contradictions are more prominent, and the low-efficiency and ineffective water injection phenomenon is serious. The underground seepage field changes continuously, and the water vapor distribution is more and more complex, and it is difficult to adjust the water saturation. Therefore, in the indoor simulation research, the water saturation is one of the important parameters for studying the seepage law of the reservoir, so it is particularly important to accurately depict this parameter.

[0039] Embodiment one

[0040] Figure 1 It is a flowchart of a rock sample water vapor calibration method provided by the embodiment one of the present application. The embodiment can be applicable to the determination of rock sample water vapor. The method can be executed by a rock sample water vapor calibration device, which can be realized in the form of hardware and / or software.

[0041] As shown in the method, the method comprises: Figure 1

[0042] S110, calibrate 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 in the saturated state.

[0044] In the embodiment of the present application, the conventional core treatment comprises:

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

[0046] The length and diameter of the core are measured, and dry scanning is performed by using nuclear magnetic resonance;

[0047] The core holder containing the core is vacuumized for 48 hours by using a vacuum pump, and saturated with water for 48 hours.

[0048] S120, the core is taken out and placed in the core holder, the incubator is turned on to a preset temperature, and the process airtightness is checked.

[0049] S130, constant-speed or constant-pressure water flooding is performed, the permeability is determined after the pressure or flow rate is stabilized, nuclear magnetic resonance detection is performed, and the second water content is calibrated.

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

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

[0052] In the embodiment of the present application, the water vapor content of the core is determined according to the first water content and the second water content, which includes determining the difference between the first water content and the second water content to determine the water vapor content of the core.

[0053] S150, the second water content is repeatedly calibrated, and a plurality of water vapor contents are determined according to the first water content, and the calibration is completed when the plurality of water vapor contents meet a preset condition.

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

[0055] Water saturation is one of the important parameters for studying reservoir percolation law, so it is particularly important to accurately depict this parameter. Under formation conditions, part of the water exists in the form of water vapor, which to some extent interferes with the determination of water saturation. The present application realizes the determination of water vapor of rock samples under different temperature conditions by using high-resolution nuclear magnetic resonance technology, and promotes the further development of indoor core basic experiments.

[0056] Figure 2 is a schematic diagram of a water vapor content experimental device suitable for the first embodiment of the present application. The technical scheme provided by the present application in the experimental process method of the experimental device is as follows:

[0057] Step 1: The core is washed with oil, dried for 24 hours, the length and diameter of the core are measured, and dry scanning is performed by using high-precision nuclear magnetic resonance;

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

[0059] Step 3: Clean the equipment, follow the steps of Figure 1 Build the flow, take out the core and place it in the core holder, turn on the incubator to the required temperature, and check the flow tightness;

[0060] Step 4: According to the injection rate of the fluid, carry out constant speed / constant pressure water drive, and calculate the outlet water permeability when the pressure / flow rate is stable, carry out nuclear magnetic detection, and calibrate the liquid water content;

[0061] Step 5: Subtract the liquid water content in step 4 from the water content in step 2, which is the water vapor content in the core;

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

[0063] According to the working principle of nuclear magnetic resonance, it can accurately identify solid and liquid containing H ions, but cannot capture gas. By using multiple measurements and combining mathematical operations, it can completely and finely quantify the water vapor content of the rock sample under formation conditions at different stages, which is of great significance for indoor physical simulation experiment research and understanding of reservoir percolation law.

[0064] Example 1:

[0065] Sandstone with permeability of 50 mD, length of 6 cm, and diameter of 2.5 cm was used for the experiment, the experimental water was Daqing formation simulation water, the experimental temperature was 60℃, 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, the pressure was stable, the water saturation was measured by the conventional weighing method to be 65%, and after the release of the scheme, the water saturation was 60% and the water vapor accounted for 5%.

[0067] Example 2:

[0068] Sandstone with permeability of 50 mD, length of 6 cm, and diameter of 2.5 cm was used for the experiment, the experimental water was Daqing formation simulation water, the experimental temperature was 80℃, 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, the pressure was stable, the water saturation was measured by the conventional weighing method to be 71%, and after the release of the scheme, the water saturation was 60% and the water vapor accounted for 11%.

[0070] The present application is directed to the working principle of nuclear magnetic resonance, which can accurately identify solid and liquid containing H ions, and cannot capture gas. By using multiple measurements, combined with mathematical operations, the water vapor content of the rock sample at different stages under formation conditions can be quantified completely and finely, which is of great significance for indoor physical simulation experiment research and understanding of reservoir seepage law.

[0071] Embodiment two

[0072] Figure 3 is a structural schematic diagram of a rock sample water vapor calibration device provided by the present application embodiment two. As Figure 3 shown, the device comprises:

[0073] The first calibration unit 310 is used to calibrate the first water content in the core of the rock sample after conventional core treatment;

[0074] The heating unit 320 is used to take out the core and place it in the core holder, open the incubator to heat to the preset temperature, and check the process airtightness;

[0075] The second calibration unit 330 is used for constant speed or constant pressure water drive, and after the pressure or flow rate is stable, the permeability is determined, the nuclear magnetic detection is carried out, and the second water content is calibrated;

[0076] The water vapor content determination unit 340 is used 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 with the first water content, and complete the calibration when the plurality of water vapor contents meet the preset condition.

[0078] Optionally, the conventional core treatment comprises:

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

[0080] The length and diameter of the core are measured, and the nuclear magnetic is used for dry scanning treatment;

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

[0082] Optionally, the water vapor content determination unit 340 is used to execute:

[0083] The difference between the first water content and the second water content is used to determine the water vapor content of the core.

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

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

[0086] Embodiment three

[0087] Figure 4 A structural schematic diagram of an electronic device 10 that can be used to implement embodiments of the present application is shown. The electronic device is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular telephones, smart phones, wearable devices (e.g., headsets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the present application described and / or claimed in this document.

[0088] As shown in Figure 4 The electronic device 10 includes at least one processor 11, and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11, wherein the memory stores a computer program that can be executed by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. 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 plurality 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, a loudspeaker, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0090] The processor 11 can be various general and / or special purpose processing components having processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 performs various methods and processes described above, such as the core sample water vapor calibration method.

[0091] In some embodiments, the core sample water vapor calibration method can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded onto the RAM 13 and executed by the processor 11, one or more steps of the core sample water vapor calibration method described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to perform the core sample water vapor calibration method by any other suitable means, such as by means of firmware.

[0092] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (PLD), a computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0093] Computer programs used to implement the methods of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the computer program, when executed by the processor of the machine, implements the functions / acts specified in the flowcharts and / or block diagrams. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine as a stand-alone software package, partially on a machine and partially on a remote machine or entirely on a remote machine or server.

[0094] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer-readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of a machine-readable storage medium will include one or more lines of a program of instructions in a transitory signal, a portable computer diskette, 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 disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0095] To provide for interaction with a user, the systems and techniques described here 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 a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; 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 acoustic, speech, or tactile input.

[0096] The systems and techniques described here can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0097] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can 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 large management difficulty and weak business scalability in traditional physical host and VPS service.

[0098] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, each step described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0099] The above detailed description does not constitute a limitation on the scope of protection of the present application. 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 replacements and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for calibrating water vapor in rock samples, characterized in that, include: The first water content in the core of the rock sample after conventional core processing is determined, where the first water content refers to the water content under saturation. Remove the core and place it in the core holder. Turn on the constant temperature chamber to heat it to the preset temperature and check the airtightness of the process. Perform constant-rate or constant-pressure water drive. After the pressure or flow rate stabilizes, determine the permeability, perform nuclear magnetic resonance detection, and calibrate the second water content. The second water content refers to the water content after the water drive is completed. The water vapor content of the core is determined based on the first water content and the second water content. The second water content is repeatedly calibrated and the first water content is used to determine multiple water vapor contents. The calibration is completed when the multiple water vapor contents meet preset conditions. The conventional core processing includes: The core samples were washed with oil and dried for 24 hours. Core length and diameter were measured, and dry scanning was performed using nuclear magnetic resonance. The core holder containing the core was evacuated for 48 hours and saturated with water for 48 hours using a vacuum pump. The determination of the water vapor content of the core based on the first water content and the second water content includes: The water vapor content of the core is determined by the difference between the first water content and the second water content.

2. The method according to claim 1, characterized in that, The preset condition is that the difference between the contents of the plurality of water vapors does not exceed 1%.

3. A rock sample water vapor calibration device, characterized in that, include: The first calibration unit is used to calibrate the first water content in the core of rock samples after conventional core processing; The heating unit is used to remove the core and place it in the core holder, turn on the constant temperature chamber to heat it to the preset temperature, and check the airtightness of the process. The second calibration unit is used for constant-rate or constant-pressure water drive. After the pressure or flow rate stabilizes, the permeability is determined, nuclear magnetic resonance is performed, and the second water content is calibrated. A water vapor content determination unit is used to determine the water vapor content of the core based on the first water content and the second water content. The third calibration unit is used to repeatedly calibrate the second water content and determine multiple water vapor contents together with the first water content, and complete the calibration when the multiple water vapor contents meet preset conditions.

4. 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 rock sample water vapor calibration method according to any one of claims 1-2.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the rock sample water vapor calibration method according to any one of claims 1-2.

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