Breakthrough pressure calculation method and device, electronic equipment and storage medium

Abstract

The invention discloses a breakthrough pressure calculation method and device, electronic equipment and a storage medium. The method comprises the steps that first interfacial tension between methane gas and formation water in a to-be-measured well under the formation condition is determined; obtaining the equivalent pore radius of the to-be-logged well; and according to the first interfacial tension and the equivalent pore radius, calculating the breakthrough pressure of the cap stratum of the to-be-logged well. According to the technical scheme, in the calculation process of the breakthrough pressure of the cap layer of the well to be logged, through the first interfacial tension and the equivalent pore radius, the influence caused by environmental factors is reduced, and the calculation precision of the breakthrough pressure of the cap layer of the well to be logged and the applicability of the calculation method are improved.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas exploration, and in particular to a method, device, electronic equipment and storage medium for calculating breakthrough pressure. Background Art

[0002] During the drilling process, when the pressure on the formation around the wellbore exceeds the maximum pressure it can withstand, it will cause the formation to rupture, resulting in leakage or blowout. Therefore, it is of great significance to evaluate the sealing capacity of the cap layer by calculating the breakthrough pressure of the cap layer of the well to be tested.

[0003] At present, the breakthrough pressure of the caprock of the well to be tested is mostly calculated using porosity or shale content curves, but the influence of environmental factors is not taken into account, and the accuracy and applicability are low. Summary of the invention

[0004] The present invention provides a method, device, electronic device and storage medium for calculating breakthrough pressure. In the process of calculating the breakthrough pressure of the cap layer of the well to be measured, the first interfacial tension and the equivalent pore radius are used to reduce the influence of environmental factors, thereby improving the calculation accuracy of the breakthrough pressure of the cap layer of the well to be measured and the applicability of the calculation method.

[0005] According to one aspect of the present invention, a method for calculating breakthrough pressure is provided, the method comprising:

[0006] determining a first interfacial tension between methane gas and formation water in the well to be tested under formation conditions;

[0007] Obtaining the equivalent pore radius of the well to be tested;

[0008] The breakthrough pressure of the cap layer of the well to be tested is calculated according to the first interfacial tension and the equivalent pore radius.

[0009] According to another aspect of the present invention, there is provided a device for calculating breakthrough pressure, the device comprising:

[0010] A first interfacial tension determination module, used to determine a first interfacial tension between methane gas and formation water in the well to be tested under formation conditions;

[0011] An equivalent pore radius acquisition module is used to acquire the equivalent pore radius of the well to be tested;

[0012] The breakthrough pressure calculation module is used to calculate the breakthrough pressure of the cap layer of the well to be measured according to the first interfacial tension and the equivalent pore radius.

[0013] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0014] at least one processor; and

[0015] a memory communicatively connected to the at least one processor; wherein,

[0016] 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 method for calculating the breakthrough pressure described in any embodiment of the present invention.

[0017] 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 method for calculating the breakthrough pressure described in any embodiment of the present invention when executed.

[0018] The technical solution of the embodiment of the present invention determines the first interfacial tension between the methane gas and the formation water in the well to be measured under formation conditions; obtains the equivalent pore radius of the well to be measured; and calculates the breakthrough pressure of the cap layer of the well to be measured according to the first interfacial tension and the equivalent pore radius. The technical solution of the embodiment of the present invention reduces the influence of environmental factors through the first interfacial tension and the equivalent pore radius during the calculation of the breakthrough pressure of the cap layer of the well to be measured, thereby improving the calculation accuracy of the breakthrough pressure of the cap layer of the well to be measured and the applicability of the calculation method.

[0019] 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

[0020] 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.

[0021] Figure 1 is a flow chart of a method for calculating breakthrough pressure provided according to Embodiment 1 of the present invention;

[0022] Figure 2 is a flow chart of a method for calculating breakthrough pressure provided according to Embodiment 2 of the present invention;

[0023] Figure 3 is a schematic structural diagram of a breakthrough pressure calculation device provided according to Embodiment 3 of the present invention;

[0024] Figure 4It is a structural schematic diagram of an electronic device for implementing the method for calculating the breakthrough pressure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] Embodiment 1

[0028] Figure 1 A flowchart of a method for calculating breakthrough pressure is provided for the first embodiment of the present invention. This embodiment is applicable to the case of calculating the breakthrough pressure of a cap layer. The method can be executed by a breakthrough pressure calculation device. The breakthrough pressure calculation device can be implemented in the form of hardware and / or software. The breakthrough pressure calculation device can be configured in an electronic device. Figure 1 As shown, the method includes:

[0029] S110. Determine a first interfacial tension between methane gas and formation water in the well to be tested under formation conditions.

[0030] Among them, interfacial tension refers to the tension on the contact surface between two different substances. It is caused by the mutual attraction between molecules. The magnitude of interfacial tension depends on the properties of the substance itself and the environmental conditions. Generally speaking, the interfacial tension between gas and water can be calculated according to the Young-Laplace equation, through the radius of curvature and the pressure difference on both sides of the surface.

[0031] Different from the traditional method, in the embodiment of the present invention, when determining the first interfacial tension between methane gas and formation water in the well to be tested under formation conditions, it is necessary to take into account the formation pressure, formation temperature and mineralization of formation water to simulate different formation environments. Firstly, the real environmental conditions can be restored to improve the accuracy of the first interfacial tension calculation, and secondly, the applicability of the calculation method can be improved.

[0032] S120, obtaining the equivalent pore radius of the well to be tested.

[0033] Among them, the equivalent pore radius is a parameter used to characterize the degree of influence of the pores existing in the formation on the flow of fluids. The unit is usually nm or μm, which can be used to describe the pore structure characteristics of the formation rock. Generally speaking, when obtaining the equivalent pore radius of the well to be measured, the following methods can be used: 1. Nitrogen adsorption method, by adsorbing nitrogen into the pores on the surface of the rock, the equivalent pore radius is calculated according to the adsorption isotherm curve. 2. Mercury injection method, using a mercury injection instrument to measure the penetration of mercury in rock samples under different pressures, and calculating the equivalent pore radius based on the relationship between the penetration rate and pressure change. 3. Nuclear magnetic resonance, using nuclear magnetic resonance technology to scan and measure rock samples containing fluids (such as water or oil), obtain pore structure information from them, and then calculate the equivalent pore radius. In an embodiment of the present invention, the equivalent pore radius of the well to be measured can be obtained by nuclear magnetic resonance.

[0034] S130. Calculate the breakthrough pressure of the caprock of the well to be tested according to the first interfacial tension and the equivalent pore radius.

[0035] The breakthrough pressure of the cap layer of the well to be tested refers to the maximum pressure that the formation around the wellbore can withstand during the drilling process. Exceeding this pressure will cause the formation to rupture, resulting in leakage or blowout. Therefore, the breakthrough pressure of the cap layer of the well to be tested is mostly used to evaluate the sealing capacity of the cap layer.

[0036] In the embodiment of the present invention, after the first interfacial tension and the equivalent pore radius are calculated, the first interfacial tension and the equivalent pore radius can be used to calculate the breakthrough pressure of the cap layer of the well to be measured. It can be understood that since the formation temperature and the salinity of the formation water are introduced in the calculation process of the first interfacial tension, the influence of environmental factors on the calculation results is reduced, and the accuracy of the breakthrough pressure of the cap layer of the well to be measured is significantly improved, and it has high applicability.

[0037] The technical solution of the embodiment of the present invention determines the first interfacial tension between the methane gas and the formation water in the well to be measured under formation conditions; obtains the equivalent pore radius of the well to be measured; and calculates the breakthrough pressure of the cap layer of the well to be measured according to the first interfacial tension and the equivalent pore radius. The technical solution of the embodiment of the present invention reduces the influence of environmental factors through the first interfacial tension and the equivalent pore radius during the calculation of the breakthrough pressure of the cap layer of the well to be measured, thereby improving the calculation accuracy of the breakthrough pressure of the cap layer of the well to be measured and the applicability of the calculation method.

[0038] Embodiment 2

[0039] Figure 2 This is a flow chart of a method for calculating breakthrough pressure provided in the second embodiment of the present invention. The embodiment of the present invention is optimized based on the above embodiment. For solutions not described in detail in the embodiment of the present invention, please refer to the above embodiment. Figure 2 As shown, the method includes:

[0040] S210, calculating the second interfacial tension between methane gas and pure water according to the formation temperature and formation pressure of the well to be measured.

[0041] In the embodiment of the present invention, for the convenience of calculation, the second interfacial tension between methane gas and pure water can be calculated based on the formation temperature and formation pressure of the well to be measured, and then the first interfacial tension can be calculated based on the second interfacial tension.

[0042] Specifically, the second interfacial tension between methane gas and pure water is calculated according to the formation temperature and formation pressure of the well to be measured, including:

[0043] The second interfacial tension between methane gas and pure water is calculated according to the following formula:

[0044]

[0045] Among them, σ gw represents the second interfacial tension between methane gas and pure water, T represents the temperature of the well to be measured with depth, ρ L represents the density of pure water at formation pressure, ρ V It represents the density of methane gas under formation pressure, and a, b, and c are coefficient constants. Formation pressure and formation temperature can be obtained through well logging data, and the density of pure water and methane gas under formation pressure can be obtained through query.

[0046] S220, obtaining the formation water mineralization of the well to be tested.

[0047] Among them, formation water mineralization refers to the content or concentration of inorganic salt substances dissolved in formation water, usually indicated by the mass concentration of total dissolved solids. Mineralization is an important water quality indicator of formation water, also known as formation water salinity.

[0048] In order to determine the mineralization of formation water, it is generally necessary to collect water samples and measure the total dissolved solid mass in the water samples using laboratory analysis methods. Common analysis methods include conductivity measurement, ion chromatography or atomic absorption spectrometry. In the embodiment of the present invention, the mineralization of formation water can be calculated by the conductivity of formation water.

[0049] S230. Calculate the first interfacial tension between the methane gas and the formation water in the well to be tested under formation conditions according to the second interfacial tension and the salinity of the formation water.

[0050] It can be understood that the second interfacial tension is between methane gas and pure water. Therefore, it is necessary to increase the correction amount between pure water and formation water through the mineralization of formation water to calculate the first interfacial tension between methane gas and formation water in the well to be tested under formation conditions.

[0051] Specifically, according to the second interfacial tension and the salinity of the formation water, the first interfacial tension between the methane gas and the formation water in the well to be tested under the formation conditions is calculated, including:

[0052] The first interfacial tension between methane gas and formation water in the well to be tested under formation conditions is calculated according to the following formula:

[0053]

[0054] Among them, σ gb represents the first interfacial tension between methane gas and formation water, Indicates the molar percentage of methane gas in the well to be tested to all gases, C s It represents the mineralization of formation water, and k is the coefficient constant.

[0055] It should be noted that the gas in the formation is mainly composed of methane gas, so in the embodiment of the present invention, the interfacial tension is calculated using methane gas. If other gas components in the formation are known, the correction amount of the gas can also be increased to further improve the accuracy of the calculation result.

[0056] S240, obtaining nuclear magnetic resonance logging data of the well to be logged, and determining the permeability of the well to be logged based on the nuclear magnetic resonance logging data; or, obtaining the shale content and porosity curve of the well to be logged, and determining the permeability of the well to be logged based on the shale content and porosity curve.

[0057] Among them, the permeability of the well to be tested refers to the ability of formation rocks to penetrate fluids, and is an important parameter for describing the seepage properties of formation rocks.

[0058] In the embodiment of the present invention, the permeability of the well to be tested can be determined by obtaining the T2 spectrum in the nuclear magnetic resonance logging data of the well to be tested, or by obtaining the mud content and porosity curve of the well to be tested.

[0059] S250. Calculate the equivalent pore radius of the well to be tested based on the permeability.

[0060] In the embodiment of the present invention, the relationship between the equivalent pore radius and the permeability can be established by using regional experience or core test analysis data, and the equivalent pore radius of the well to be measured is calculated based on the relationship between the two and the permeability. It should be noted that when calculating the equivalent pore radius using the permeability determined by the mud content and the porosity curve, the calculation result needs to be corrected using the breakthrough pressure test data.

[0061] Specifically, calculating the equivalent pore radius of the well to be measured according to the permeability includes:

[0062] The equivalent pore radius of the well to be tested is calculated according to the following formula:

[0063] Log(k_log)=d+e*r;

[0064] Wherein, k_log represents the permeability, r represents the equivalent pore radius of the well to be measured, and d and e are coefficient constants respectively.

[0065] S260. Calculate the breakthrough pressure of the caprock of the well to be measured according to the first interfacial tension and the equivalent pore radius.

[0066] In the embodiment of the present invention, after the first interfacial tension and the equivalent pore radius are calculated, the first interfacial tension and the equivalent pore radius can be used to calculate the breakthrough pressure of the caprock of the well to be measured.

[0067] Specifically, calculating the breakthrough pressure of the cap layer of the well to be tested according to the first interfacial tension and the equivalent pore radius includes:

[0068] The breakthrough pressure of the caprock of the well to be tested is calculated according to the following formula:

[0069]

[0070] Among them, P c represents the breakthrough pressure of the caprock of the well to be tested, σ gb represents the first interfacial tension between methane gas and formation water, r represents the equivalent pore radius of the well to be tested, and θ represents the contact angle between various rocks and fluids.

[0071] The technical solution of the embodiment of the present invention calculates the second interfacial tension between methane gas and pure water according to the formation temperature and formation pressure of the well to be measured; obtains the formation water salinity of the well to be measured; calculates the first interfacial tension between methane gas and formation water in the well to be measured under formation conditions according to the second interfacial tension and the formation water salinity; obtains the nuclear magnetic resonance logging data of the well to be measured, and determines the permeability of the well to be measured according to the nuclear magnetic resonance logging data; or obtains the mud content and porosity curve of the well to be measured, and determines the permeability of the well to be measured according to the mud content and the porosity curve; calculates the equivalent pore radius of the well to be measured according to the permeability; calculates the breakthrough pressure of the cap layer of the well to be measured according to the first interfacial tension and the equivalent pore radius. The technical solution of the embodiment of the present invention reduces the influence of environmental factors in the calculation process of the breakthrough pressure of the cap layer of the well to be measured by introducing parameters such as formation temperature, formation water salinity, and permeability, thereby improving the calculation accuracy of the breakthrough pressure of the cap layer of the well to be measured and the applicability of the calculation method.

[0072] Embodiment 3

[0073] Figure 3 This is a schematic diagram of a device for calculating breakthrough pressure provided in Embodiment 3 of the present invention. Figure 3 As shown, the device comprises:

[0074] A first interfacial tension determination module 310 is used to determine a first interfacial tension between methane gas and formation water in the well to be tested under formation conditions;

[0075] An equivalent pore radius acquisition module 320 is used to acquire the equivalent pore radius of the well to be tested;

[0076] The breakthrough pressure calculation module 330 is used to calculate the breakthrough pressure of the cap layer of the well to be measured according to the first interfacial tension and the equivalent pore radius.

[0077] Optionally, the first interfacial tension determination module 310 includes:

[0078] A second interfacial tension calculation unit, used for calculating the second interfacial tension between the methane gas and the pure water according to the formation temperature and the formation pressure of the well to be measured;

[0079] A formation water mineralization acquisition unit, used to acquire the formation water mineralization of the well to be tested;

[0080] The first interfacial tension calculation unit is used to calculate the first interfacial tension between the methane gas and the formation water in the well to be tested under formation conditions according to the second interfacial tension and the formation water salinity.

[0081] Optionally, the second interfacial tension calculation unit is specifically used to:

[0082] The second interfacial tension between methane gas and pure water is calculated according to the following formula:

[0083]

[0084] Among them, σ gw represents the second interfacial tension between methane gas and pure water, T represents the temperature of the well to be measured with depth, ρ L represents the density of pure water at formation pressure, ρ V It represents the density of methane gas under formation pressure, and a, b, and c are coefficient constants.

[0085] Optionally, the first interfacial tension calculation unit is specifically used to:

[0086] The first interfacial tension between methane gas and formation water in the well to be tested under formation conditions is calculated according to the following formula:

[0087]

[0088] Among them, σ gb represents the first interfacial tension between methane gas and formation water, Indicates the molar percentage of methane gas in the well to be tested to all gases, C s It represents the mineralization of formation water, and k is the coefficient constant.

[0089] Optionally, the equivalent pore radius acquisition module 320 includes:

[0090] A permeability acquisition unit, used to acquire nuclear magnetic resonance logging data of the well to be logged, and determine the permeability of the well to be logged according to the nuclear magnetic resonance logging data; or, to acquire the shale content and porosity curve of the well to be logged, and determine the permeability of the well to be logged according to the shale content and the porosity curve;

[0091] The equivalent pore radius calculation unit is used to calculate the equivalent pore radius of the well to be tested according to the permeability.

[0092] Optionally, the equivalent pore radius calculation unit is specifically used to:

[0093] The equivalent pore radius of the well to be tested is calculated according to the following formula:

[0094] Log(k_log)=d+e*r;

[0095] Wherein, k_log represents the permeability, r represents the equivalent pore radius of the well to be measured, and d and e are coefficient constants respectively.

[0096] Optionally, the breakthrough pressure calculation module 330 is specifically used for:

[0097] The breakthrough pressure of the caprock of the well to be tested is calculated according to the following formula:

[0098]

[0099] Among them, P c represents the breakthrough pressure of the caprock of the well to be tested, σ gb represents the first interfacial tension between methane gas and formation water, r represents the equivalent pore radius of the well to be tested, and θ represents the contact angle between various rocks and fluids.

[0100] The device for calculating the breakthrough pressure provided in the embodiment of the present invention can execute the method for calculating the breakthrough pressure provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0101] Embodiment 4

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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 a method for calculating the breakthrough pressure.

[0106] In some embodiments, the method for calculating the breakthrough pressure 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 method for calculating the breakthrough pressure described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the method for calculating the breakthrough pressure in any other appropriate manner (e.g., by means of firmware).

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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).

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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 method for calculating breakthrough pressure, characterized in that: include: determining a first interfacial tension between methane gas and formation water in the well to be tested under formation conditions; Obtaining the equivalent pore radius of the well to be tested; The breakthrough pressure of the cap layer of the well to be tested is calculated according to the first interfacial tension and the equivalent pore radius.

2. The method according to claim 1, characterized in that Determine the first interfacial tension between methane gas and formation water in the well to be tested under formation conditions, including: Calculating the second interfacial tension between methane gas and pure water according to the formation temperature and formation pressure of the well to be measured; Obtain formation water mineralization of the well to be tested; The first interfacial tension between the methane gas and the formation water in the well to be tested under formation conditions is calculated according to the second interfacial tension and the formation water salinity.

3. The method according to claim 2, characterized in that Calculating the second interfacial tension between methane gas and pure water according to the formation temperature and formation pressure of the well to be measured, including: The second interfacial tension between methane gas and pure water is calculated according to the following formula: Among them, σ gw represents the second interfacial tension between methane gas and pure water, T represents the temperature of the well to be measured with depth, ρ L represents the density of pure water at formation pressure, ρ V It represents the density of methane gas under formation pressure, and a, b, and c are coefficient constants.

4. The method according to claim 3, characterized in that Calculating the first interfacial tension between the methane gas and the formation water in the well to be tested under formation conditions according to the second interfacial tension and the formation water salinity includes: The first interfacial tension between methane gas and formation water in the well to be tested under formation conditions is calculated according to the following formula: Among them, σ gb represents the first interfacial tension between methane gas and formation water, Indicates the molar percentage of methane gas in the well to be tested to all gases, C s It represents the mineralization of formation water, and k is the coefficient constant.

5. The method according to claim 1, characterized in that Obtaining the equivalent pore radius of the well to be measured includes: Acquire nuclear magnetic resonance logging data of the well to be logged, and determine the permeability of the well to be logged according to the nuclear magnetic resonance logging data; or, acquire the shale content and porosity curve of the well to be logged, and determine the permeability of the well to be logged according to the shale content and the porosity curve; The equivalent pore radius of the well to be tested is calculated according to the permeability.

6. The method according to claim 5, characterized in that Calculating the equivalent pore radius of the well to be tested according to the permeability includes: The equivalent pore radius of the well to be tested is calculated according to the following formula: Log(k_log)=d+e*r; Wherein, k_log represents the permeability, r represents the equivalent pore radius of the well to be measured, and d and e are coefficient constants respectively.

7. The method according to any one of claims 1 to 6, characterized in that: Calculating the breakthrough pressure of the cap layer of the well to be tested according to the first interfacial tension and the equivalent pore radius includes: The breakthrough pressure of the caprock of the well to be tested is calculated according to the following formula: Among them, P c represents the breakthrough pressure of the caprock of the well to be tested, σ gb represents the first interfacial tension between methane gas and formation water, r represents the equivalent pore radius of the well to be tested, and θ represents the contact angle between various rocks and fluids.

8. A device for calculating breakthrough pressure, characterized in that: include: A first interfacial tension determination module, used to determine a first interfacial tension between methane gas and formation water in the well to be tested under formation conditions; An equivalent pore radius acquisition module is used to acquire the equivalent pore radius of the well to be tested; The breakthrough pressure calculation module is used to calculate the breakthrough pressure of the cap layer of the well to be measured according to the first interfacial tension and the equivalent pore radius.

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, and the computer program is executed by the at least one processor so that the at least one processor can perform the method for calculating the breakthrough pressure 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 method for calculating the breakthrough pressure according to any one of claims 1 to 7 when the instructions are executed.

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