A method, device and medium for dynamic physical property testing of dense rock under formation conditions

Abstract

The present invention discloses a method, device, and medium for testing the dynamic physical properties of dense rock. The method comprises: determining environmental parameters corresponding to dense rock at multiple burial depths based on a pre-constructed parameter model under real formation conditions; conducting a dense rock seepage experiment based on the environmental parameters, and determining the physical property parameters of the dense rock at the burial depth corresponding to the environmental parameters using the experimental data from the dense rock seepage experiment; determining the dynamic relationship between the rock physical property parameters and burial depth based on the physical property parameters corresponding to the dense rock at multiple burial depths, and then determining the physical property parameters corresponding to the dense rock at the target burial depth. The method is simple to operate and can accurately and reasonably calculate properties such as permeability without drilling extremely deeply buried rock samples, thus realizing dynamic quantitative testing of the permeability of dense rock at different burial depths under formation conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic permeability testing of unconventional oil and gas reservoirs such as deep clastic rocks, carbonate rocks, and shale, and in particular to a method, device, and medium for dynamic physical property testing of dense rocks under formation conditions. Background Art

[0002] In the process of oil and gas exploration and development, rock physical properties are one of the key parameters in the fields of reservoir prediction and reservoir dynamic modeling.

[0003] Existing technology allows for the physical properties of dense sandstone at shallow burial depths (0-1500m) to be determined by drilling and then conducting experimental tests on these samples. However, for dense sandstone at extremely deep burial depths, such as those exceeding 4000m, drilling is not feasible, resulting in a lack of a reliable method for determining its physical properties. Therefore, the challenge of dynamic physical property testing of dense rock under formation conditions is a pressing technical challenge in oil and gas exploration and development. Summary of the Invention

[0004] The present invention provides a method, device and medium for dynamic physical property testing of dense rock under formation conditions, so as to solve the problem of dynamic physical property testing of dense rock under formation conditions.

[0005] According to one aspect of the present invention, a method for dynamic physical property testing of dense rock under formation conditions is provided, comprising:

[0006] Pre-build a model based on real formation conditions to determine the environmental parameters corresponding to dense rocks at multiple burial depths;

[0007] Conducting a dense rock seepage experiment based on environmental parameters, and determining the physical properties of the dense rock at the burial depth corresponding to the environmental parameters using experimental data from the dense rock seepage experiment;

[0008] Based on the physical properties of dense rocks at multiple burial depths, the dynamic relationship between the rock physical properties and the rock burial depth is determined, and based on the relationship between the rock physical properties and the burial depth, the physical properties of dense rocks at the target burial depth are determined.

[0009] According to another aspect of the present invention, a device for testing dynamic physical properties of dense rock under formation conditions is provided, comprising:

[0010] Environmental parameter determination module: used to pre-build a model based on real formation conditions and determine the environmental parameters corresponding to dense rocks at multiple burial depths;

[0011] Physical property parameter determination module: used to conduct dense rock seepage experiments according to environmental parameters, and determine the physical property parameters of dense rock at the burial depth corresponding to the environmental parameters through the experimental data of the dense rock seepage experiment;

[0012] Target physical property parameter determination module: used to determine the dynamic relationship between rock physical property parameters and rock burial depth based on the reference physical property parameters corresponding to dense rocks at multiple burial depths, and determine the physical property parameters corresponding to dense rocks at the target burial depth based on the relationship between rock physical property parameters and burial depth.

[0013] According to another aspect of the present invention, an electronic device is provided, 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 that can be executed 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 dynamic physical property testing method of tight rock under formation conditions 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 dynamic physical property testing of dense rock under formation conditions described in any embodiment of the present invention when executed.

[0018] The technical solution of the embodiment of the present invention uses dense sandstone that is relatively easy to drill and has a shallow burial depth (0 to 1500m), and uses experiments to simulate the external storage environment of dense sandstone that is difficult to drill and has a very deep burial depth. It then infers the physical properties of dense sandstone at a very deep burial depth (more than 4000m), such as permeability, triaxial strain, elastic modulus, and Poisson's ratio. This method is simple to operate and solves the problem of changes in rock properties caused by changes in temperature and pressure when rock samples are taken from deep strata to the surface. It enables the measurement of dynamic physical properties of deep and ultra-deep rocks under formation conditions, improves the accuracy of experimental measurement results, and thus reflects the characteristics of underground rock physical parameters as realistically as possible. The method is simple to operate and can accurately and reasonably calculate properties such as permeability without drilling extremely deep buried rock samples, realizing dynamic quantitative testing of the permeability of dense rocks at different burial depths under formation conditions.

[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily 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 This is a flow chart of a method for testing dynamic physical properties of dense rock under formation conditions according to the first embodiment of the present invention;

[0022] Figure 2 A regular curve showing changes in elastic modulus and Poisson's ratio of dense sandstone with burial depth according to the first embodiment of the present invention;

[0023] Figure 3 A regular curve showing changes in the permeability of dense sandstone with burial depth according to the first embodiment of the present invention;

[0024] Figure 4 This is a schematic structural diagram of a dynamic physical property testing device for dense rock under formation conditions according to a second embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the structure of an electronic device for implementing the method for dynamic physical property testing of dense rock under formation conditions according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions 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 embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "candidate", "target", etc. in the description 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 numbers 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 that are inherent to these processes, methods, products or devices.

[0028] Example 1

[0029] Figure 1 A flowchart of a method for dynamic physical property testing of dense rock under formation conditions is provided for the first embodiment of the present invention. This embodiment is applicable to the case of testing the physical properties of dense rock. The method can be executed by a dynamic physical property testing device for dense rock under formation conditions. The dynamic physical property testing device for dense rock under formation conditions can be implemented in the form of hardware and / or software. The dynamic physical property testing device for dense rock under formation conditions can be configured in any electronic device with network communication function. Figure 1 As shown, the method includes:

[0030] S110. Pre-build a model based on actual stratum conditions to determine environmental parameters corresponding to dense rocks at multiple burial depths.

[0031] The burial depth is the burial depth of the formation where the physical characteristics of the tight sandstone need to be analyzed. For example, the burial depth can be H i .

[0032] Environmental parameters are parameters that can characterize the physical characteristics of dense sandstone at burial depths.

[0033] Optionally, the environmental parameters include formation temperature, pore fluid pressure, vertical principal stress, maximum horizontal stress, minimum horizontal stress and confining pressure corresponding to the tight rock reservoir.

[0034] A model pre-built based on actual formation conditions can be one that can convert actual measured environmental parameters of dense rock at burial depth into environmental parameters. For example, a model pre-built based on actual formation conditions can convert formation temperature corresponding to dense rock, as well as pore fluid pressure, vertical principal stress, maximum horizontal stress, minimum horizontal stress, and confining pressure corresponding to dense rock.

[0035] Furthermore, by monitoring the tight sandstone at different sampleable burial depths, the vertical principal stress, maximum horizontal stress, minimum horizontal stress and confining pressure of the tight sandstone at different depths were obtained. Then, based on the obtained data, linear fitting was performed to obtain the conversion formulas for the vertical principal stress, maximum horizontal stress, minimum horizontal stress and confining pressure corresponding to different burial depths.

[0036] Furthermore, the burial depth H can be obtained according to the actual formation temperature gradient. i The formation temperature T corresponding to the tight sandstone reservoir i Conversion formula:

[0037] T i =A1+B1*H i

[0038] Among them, T i is the formation temperature, subscript i = 1, 2, 3, ..., n; A1 and B1 are temperature parameters, which are determined according to the region and reservoir where the dense rock is located at the burial depth actually required to be tested, that is, different regions and different reservoirs have different temperature parameters. For example, A1 = 15; B1 = 0.021.

[0039] Furthermore, the burial depth H can be obtained from the pressure coefficient i The conversion formulas for pore fluid pressure, vertical principal stress, maximum horizontal stress, minimum horizontal stress and confining pressure corresponding to the tight sandstone reservoir are as follows:

[0040] Burial depth H i The pore fluid pressure corresponding to the tight sandstone reservoir at is:

[0041] P i =C1*H i

[0042] Among them, P i The corresponding burial depth H i The pore fluid pressure under the pore pressure of 1 is 1, 2, 3, ..., n, where subscript i = 1, 2, 3, ..., n; the porosity fluid pressure coefficient C1 is determined according to the region and reservoir where the dense rock is located at the burial depth actually required to be tested, that is, the pore fluid pressure parameters are different in different regions and different reservoirs. For example, C1 = 0.007.

[0043] Burial depth H i The vertical principal stress corresponding to the tight sandstone reservoir at is:

[0044] σ 1i =D1*H i

[0045] Where σ 1i The corresponding burial depth Hi The vertical principal stress under the vertical principal stress, subscript i = 1, 2, 3, ..., n; the vertical principal stress coefficient D1 is determined according to the region and reservoir where the dense rock is located at the burial depth actually required to be tested, that is, different regions and different reservoirs have different vertical principal stress parameters. For example, D1 = 0.0244.

[0046] Burial depth H i The maximum horizontal stress corresponding to the tight sandstone reservoir at is:

[0047] σ 2i =E1*H i

[0048] Where σ 2i The corresponding burial depth H i The maximum horizontal stress under the condition of tantalum tungsten is 1, 2, 3, ..., n, where subscript i = 1, 2, 3, ..., n; the maximum horizontal stress coefficient E1 is determined according to the region and reservoir where the dense rock is located at the burial depth actually required to be tested, that is, different regions and different reservoirs have different maximum horizontal stress parameters. For example, E1 = 0.0185.

[0049] Burial depth H i The minimum horizontal stress corresponding to the tight sandstone reservoir at is:

[0050] σ 3i =F1*H i

[0051] Where σ 3i The corresponding burial depth H i The minimum horizontal stress under the condition of tantalum tungsten is 1, 2, 3, ..., n, where subscript i = 1, 2, 3, ..., n; the minimum horizontal stress coefficient F1 is determined according to the region and reservoir where the dense rock is located at the burial depth actually required to be tested, that is, the minimum horizontal stress parameters are different in different regions and different reservoirs. For example, F1 = 0.0153.

[0052] Burial depth H i The confining pressure corresponding to the tight sandstone reservoir at is:

[0053] C pi =σ 3i

[0054] Where C pi The corresponding burial depth H i The confining pressure under the pressure, subscript i = 1, 2, 3, …, n.

[0055] Furthermore, the environmental parameters of tight sandstone at different burial depths in this embodiment are shown in Table 1.

[0056] Table 1 Environmental parameters of tight sandstone at different burial depths

[0057]

[0058] S120. Conduct a dense rock seepage experiment according to the environmental parameters, and determine the physical property parameters of the dense rock at the burial depth corresponding to the environmental parameters based on the experimental data of the dense rock seepage experiment.

[0059] The physical properties of dense rocks at burial depths include permeability and triaxial strain, elastic modulus, and Poisson's ratio.

[0060] Conduct a dense rock seepage experiment based on environmental parameters and calculate H based on the experimental data. i Corresponding permeability and triaxial strain, elastic modulus and Poisson's ratio of tight sandstone.

[0061] Furthermore, based on the data obtained at different burial depths, the permeability, three-dimensional strain, elastic modulus and Poisson's ratio of the dense sandstone corresponding to the first burial depth H1, the second burial depth H2, the third burial depth H3, ... the nth burial depth H4 are obtained in turn.

[0062] Optionally, conduct dense rock seepage experiments based on environmental parameters, including:

[0063] A dense rock sample at an initial burial depth is obtained, and a standard cubic specimen is obtained based on the dense rock sample.

[0064] A dense sandstone sample at a burial depth of H0 is drilled and processed into a standard cubic specimen, where H0 is the initial burial depth. For example, the length, width, and height of the standard cubic specimen in this embodiment are 50 mm × 50 mm × 100 mm.

[0065] True triaxial high-temperature and high-pressure seepage experiments were carried out on standard cubic specimens using low-viscosity fluids under different environmental parameters.

[0066] The low-viscosity fluid has low internal momentum resistance and does not resist deformation. For example, the low-viscosity fluid may be nitrogen or carbon dioxide.

[0067] Optionally, a true triaxial high-temperature and high-pressure seepage test is performed on the standard cubic specimen using a low-viscosity fluid under different environmental parameters, including steps S1-S3:

[0068] Step S1: heating the standard cube specimen based on a preset heating rate until the actual formation temperature in the environmental parameters is reached.

[0069] The preset heating rate may be a temperature rising rate that is pre-set according to actual needs and can ensure that the temperature environment in the true triaxial high temperature and high pressure seepage experiment is stably raised to the actual formation temperature.

[0070] The standard cube specimen is heated at a preset heating rate. When the temperature reaches the burial depth H i Corresponding T i Stop heating and keep the temperature constant.

[0071] Step S2: Pressurize the standard cube specimen while keeping the actual formation temperature unchanged until the vertical principal stress value, maximum horizontal stress value, minimum horizontal stress value, and confining pressure value in the environmental parameters are reached.

[0072] Under the condition of keeping the actual formation temperature unchanged, according to the conversion result of S110 σ 1i , σ 2i , σ 3i and C pi As the set value for pressurizing the standard cube specimen, the standard cube specimen is pressurized so that its vertical principal stress reaches σ 1i , the maximum horizontal principal stress reaches σ 2i and the minimum horizontal principal stress reaches σ 3i and confining pressure reaches C pi .

[0073] Furthermore, the vertical principal stress, maximum horizontal principal stress and minimum horizontal principal stress are simultaneously adjusted at a pressurization rate of 0.1 MPa / s; the minimum horizontal principal stress remains unchanged after being pressurized to the set value, and the maximum horizontal principal stress is continued to be pressurized to the set value. Finally, the minimum horizontal principal stress and the maximum horizontal principal stress are kept unchanged, and the vertical principal stress is increased to the set value; then, the minimum horizontal principal stress, the maximum horizontal principal stress and the vertical principal stress are kept unchanged, and the confining pressure is increased to the set value at a pressurization rate of 0.1 MPa / s.

[0074] Step S3: While keeping the vertical principal stress, maximum horizontal stress, minimum horizontal stress and confining pressure unchanged, the pore fluid pressure of the standard cube specimen is loaded to the pore fluid pressure value in the environmental parameters, and the experimental conditions are maintained for a preset time.

[0075] The preset duration also refers to the duration required for the pre-set true triaxial high temperature and high pressure seepage experiment, such as 24 hours.

[0076] After keeping the vertical principal stress, maximum horizontal principal stress, minimum horizontal principal stress and confining pressure unchanged at the set value, the vertical principal stress, maximum horizontal principal stress, minimum horizontal principal stress and confining pressure are kept unchanged, and the pore fluid pressure is loaded to the value of H. i The corresponding value P i , and maintain the experimental conditions for 24 h.

[0077] Furthermore, before loading the pore fluid pressure of the standard cubic specimen into the pore fluid pressure value in the environmental parameter, the method further includes:

[0078] The vertical principal stress, maximum horizontal principal stress, minimum horizontal principal stress and confining pressure are kept constant at the set values, and then the longitudinal wave velocity and shear wave velocity of the tight sandstone are measured at this time.

[0079] Shear waves can be waves in which the vibration direction of the tight sandstone is perpendicular to the wave propagation direction, and the shear wave velocity can be the speed at which the shear wave propagates in the reservoir. P-waves can be waves in which the vibration direction of the tight sandstone is parallel to the wave propagation direction, and the P-wave velocity can be the speed at which the P-wave propagates in the reservoir.

[0080] Optionally, the physical properties of the dense rock at the burial depth corresponding to the environmental parameters are determined using experimental data from a dense rock seepage experiment, including:

[0081] The permeability of dense rock at the burial depth corresponding to the environmental parameters is determined as a physical property parameter according to the following formula:

[0082]

[0083] Among them, K i is the permeability of dense rock at the actual burial depth, μ i is the dynamic viscosity coefficient of gas at the actual burial depth, β i is the gas volume compressibility coefficient at the actual burial depth, where μ is the gas dynamic viscosity coefficient at the burial depth of the low-viscosity fluid at the set temperature and pressure. i and the gas volume compressibility coefficient β at the burial depth i Obtained by querying data; V is the reference volume, ΔP ii is the initial pore pressure difference at the actual burial depth, ΔP fi is the final pore pressure difference at the actual burial depth, Δt is the experimental time, ΔA s is the original cross-sectional area of ​​the standard cube specimen, ΔL s is the original length of the standard cube specimen, ΔP ii , ΔP fi and Δt are the experimental data of the tight rock seepage experiment.

[0084] Optionally, the physical properties of the dense rock at the burial depth corresponding to the environmental parameters are determined using experimental data from a dense rock seepage experiment, including:

[0085] The vertical strain, maximum horizontal principal strain, minimum horizontal principal strain, and volumetric strain of dense rock at the burial depth corresponding to the environmental parameters are determined as physical property parameters according to the following formulas:

[0086]

[0087]

[0088]

[0089] ε V =ε 1i +ε 2i +ε 3i ;

[0090] Among them, ε 1i is the vertical strain, ε 2i is the maximum horizontal principal strain, ε 3i is the minimum horizontal principal strain, ε V is the volume strain, l 1i 、l 2i 、l 3i are the vertical displacement, maximum horizontal principal displacement and minimum horizontal principal displacement corresponding to the actual burial depth, respectively. 1i 、l 2i 、l 3i These are experimental data from the dense rock seepage experiment.

[0091] Optionally, the physical properties of the dense rock at the burial depth corresponding to the environmental parameters are determined using experimental data from a dense rock seepage experiment, including:

[0092] The elastic modulus and Poisson's ratio of dense rock at the burial depth corresponding to the environmental parameters are determined as physical property parameters according to the following formula:

[0093]

[0094]

[0095]

[0096] Among them, ε 1i is the vertical strain, ε 2i is the maximum horizontal principal strain, ε 3i is the minimum horizontal principal strain, σ 1i is the vertical principal stress of dense rock at the actual burial depth, σ 2i is the maximum horizontal stress of dense rock at the actual burial depth, σ 3i is the minimum horizontal stress of dense rock at the actual burial depth, E is the elastic modulus, and μ is the Poisson's ratio.

[0097] S130. Determine the dynamic relationship between the rock physical parameters and the burial depth based on the physical parameters corresponding to the dense rock at multiple burial depths, and determine the physical parameters corresponding to the dense rock at the target burial depth based on the dynamic relationship between the rock physical parameters and the burial depth.

[0098] According to the experimental results of the rock physical parameters of the dense sandstone at different burial depths, the curve of the permeability of the dense sandstone changing with the burial depth is obtained, as shown in Figure 2. Figure 2 As shown in the figure, the elastic modulus and Poisson's ratio of tight sandstone change with burial depth, as shown in the figure. Figure 3 As shown in the figure, the physical properties of tight sandstone in deep strata are predicted based on the regular curve of the physical properties changing with burial depth.

[0099] Furthermore, when the rock burial depth information of dense rocks at other burial depths in the S area is needed, it can be obtained through Figure 2 、 Figure 3 For example, suppose we need to determine the rock burial depth information of dense rock at 2250m, from Figure 2 It can be seen that the permeability is 0.05ml; Figure 3 It can be seen that the elastic modulus is 28.1099; the Poisson's ratio is approximately equal to 0.25.

[0100] The technical solution of this embodiment uses dense sandstone that is relatively easy to drill and has a shallow burial depth (0-1500m), and uses experiments to simulate the external environment of dense sandstone that is difficult to drill and has a very deep burial depth. It then infers the physical properties of dense sandstone at a very deep burial depth (over 4000m), such as permeability, triaxial strain, elastic modulus, and Poisson's ratio. This method is simple to operate and solves the problem of changes in rock properties caused by changes in temperature and pressure when rock samples are taken from deep strata to the surface. It enables the measurement of dynamic physical properties of deep and ultra-deep rocks under formation conditions, improves the accuracy of experimental measurement results, and thus reflects the characteristics of underground rock physical parameters as realistically as possible. This method also allows for accurate and reasonable calculation of properties such as permeability without drilling extremely deep buried rock samples, realizing dynamic quantitative testing of dense rock permeability under formation conditions and at different burial depths.

[0101] Example 2

[0102] Figure 4 This is a schematic diagram of a dynamic physical property testing device for dense rock under formation conditions provided in Example 3 of the present invention. The environmental parameters include formation temperature, pore fluid pressure, vertical principal stress, maximum horizontal stress, minimum horizontal stress and confining pressure corresponding to the dense rock reservoir, such as Figure 4 As shown, the device includes:

[0103] Environmental parameter determination module 210: used to pre-build a model based on actual formation conditions and determine the environmental parameters corresponding to dense rocks at multiple burial depths;

[0104] Physical property parameter determination module 220: used to perform a dense rock seepage experiment according to the environmental parameters, and determine the physical property parameters of the dense rock at the burial depth corresponding to the environmental parameters based on the experimental data of the dense rock seepage experiment;

[0105] Target physical property parameter determination module 230: is used to determine the dynamic relationship between rock physical property parameters and burial depth based on the physical property parameters corresponding to dense rocks at multiple burial depths, and determine the physical property parameters corresponding to dense rocks at the target burial depth based on the dynamic relationship between rock physical property parameters and burial depth.

[0106] Optionally, the physical property parameter determination module 220 includes:

[0107] Standard cube specimen determination unit: used to obtain dense rock samples at the initial burial depth and prepare standard cube specimens based on the dense rock samples;

[0108] Experimental unit: used to conduct true triaxial high temperature and high pressure seepage experiments on standard cubic specimens using low viscosity fluids under different environmental parameters.

[0109] Optionally, the physical property parameter determination module 220 includes:

[0110] Actual formation temperature value loading unit: used to heat the standard cube specimen based on a preset heating rate until the actual formation temperature in the environmental parameters is reached;

[0111] Stress value loading unit: used to pressurize the standard cubic specimen while keeping the actual formation temperature unchanged until the vertical principal stress value, maximum horizontal stress value, minimum horizontal stress value and confining pressure value in the environmental parameters are reached;

[0112] Pore ​​fluid pressure value loading unit: used to load the pore fluid pressure of the standard cube specimen to the pore fluid pressure value in the environmental parameters while keeping the vertical principal stress, maximum horizontal stress, minimum horizontal stress and confining pressure unchanged, and maintain the experimental conditions for the preset time.

[0113] Optionally, the physical property parameter determination module 220 includes:

[0114] The permeability of dense rock at the burial depth corresponding to the environmental parameters is determined as a physical property parameter according to the following formula:

[0115]

[0116] Among them, K i is the permeability of dense rock at the actual burial depth, μ i is the dynamic viscosity coefficient of gas at the actual burial depth, β iis the gas volume compression coefficient at the actual burial depth, V is the reference volume, ΔP ii is the initial pore pressure difference at the actual burial depth, ΔP fi is the final pore pressure difference at the actual burial depth, Δt is the experimental time, ΔA s is the original cross-sectional area of ​​the standard cube specimen, ΔL s is the original length of the standard cube specimen, ΔP ii , ΔP fi and Δt are the experimental data of the tight rock seepage experiment.

[0117] Optionally, the physical property parameter determination module 220 includes:

[0118] The vertical strain, maximum horizontal principal strain, minimum horizontal principal strain, and volumetric strain of dense rock at the burial depth corresponding to the environmental parameters are determined as physical property parameters according to the following formulas:

[0119]

[0120]

[0121]

[0122] ε V =ε 1i +ε 2i +ε 3i ;

[0123] Among them, ε 1i is the vertical strain, ε 2i is the maximum horizontal principal strain, ε 3i is the minimum horizontal principal strain, ε V is the volume strain, l 1i 、l 2i 、l 3i are the vertical displacement, maximum horizontal principal displacement and minimum horizontal principal displacement corresponding to the actual burial depth, respectively. 1i 、l 2i 、l 3i These are experimental data from the dense rock seepage experiment.

[0124] Optionally, the physical property parameter determination module 220 includes:

[0125] The elastic modulus and Poisson's ratio of dense rock at the burial depth corresponding to the environmental parameters are determined as physical property parameters according to the following formula:

[0126]

[0127]

[0128]

[0129] Among them, ε 1i is the vertical strain, ε 2i is the maximum horizontal principal strain, ε 3i is the minimum horizontal principal strain, σ 1i is the vertical principal stress of dense rock at the actual burial depth, σ 2i is the maximum horizontal stress of dense rock at the actual burial depth, σ 3i is the minimum horizontal stress of dense rock at the actual burial depth, E is the elastic modulus, and μ is the Poisson's ratio.

[0130] The dynamic physical property testing device for dense rock under formation conditions provided by an embodiment of the present invention can execute the dynamic physical property testing method for dense rock under formation conditions provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0131] The acquisition, storage, use, and processing of data in the technical solution of this application comply with the relevant provisions of national laws and regulations and do not violate public order and good morals.

[0132] Example 3

[0133] According to an embodiment of the present disclosure, the present disclosure also provides an electronic device, a readable storage medium, and a computer program product.

[0134] Figure 5 A schematic diagram of the structure of an electronic device for implementing the method for dynamic physical property testing of tight rock under formation conditions according to an embodiment of the present invention. 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 assistants, 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 claimed herein.

[0135] like Figure 5As shown, 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. 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. Various programs and data required for the operation of the electronic device 10 can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0136] Multiple 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 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 via a computer network such as the Internet and / or various telecommunication networks.

[0137] The processor 11 can be any general-purpose and / or specialized processing component 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 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 executes the various methods and processes described above, such as the method for dynamic physical property testing of tight rock under formation conditions.

[0138] In some embodiments, the method for dynamic physical property testing of tight rock under formation conditions 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 method for dynamic physical property testing of tight rock under formation conditions described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the method for dynamic physical property testing of tight rock under formation conditions by any other appropriate means (for example, by means of firmware).

[0139] Various embodiments of the systems and techniques described above can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific reference products (ASSPs), system-on-chip systems (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes 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.

[0140] 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, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0141] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0142] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the 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 input, voice input, or tactile input).

[0143] The systems and techniques described herein can be implemented in a computing system that includes back-end 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 front-end components (e.g., a user computer with a graphical user interface or 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 back-end components, middleware components, 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.

[0144] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0145] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0146] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for testing dynamic physical properties of dense rock under formation conditions, characterized in that: The method includes: Pre-build a model based on real formation conditions to determine the environmental parameters corresponding to dense rocks at multiple burial depths; performing a dense rock seepage experiment according to the environmental parameters, and determining the physical property parameters of the dense rock at the burial depth corresponding to the environmental parameters through experimental data of the dense rock seepage experiment; Based on the physical property parameters corresponding to dense rocks at multiple burial depths, the dynamic relationship between the rock physical property parameters and the burial depth is determined, and based on the dynamic relationship between the rock physical property parameters and the burial depth, the physical property parameters corresponding to the dense rock at the target burial depth are determined.

2. The method according to claim 1, characterized in that Conducting a dense rock seepage experiment according to the environmental parameters includes: obtaining a dense rock sample at an initial depth, and preparing a standard cubic specimen based on the dense rock sample; A true triaxial high-temperature and high-pressure seepage test was conducted on the standard cubic specimen using a low-viscosity fluid under different environmental parameters.

3. The method according to claim 2, characterized in that Environmental parameters include formation temperature, pore fluid pressure, vertical principal stress, maximum horizontal stress, minimum horizontal stress and confining pressure corresponding to tight rock reservoirs.

4. The method according to claim 3, characterized in that A true triaxial high-temperature and high-pressure seepage test was conducted on the standard cubic specimen using a low-viscosity fluid under different environmental parameters, including: Heating the standard cube specimen based on a preset heating rate until the actual formation temperature in the environmental parameters is reached; Pressurizing the standard cubic specimen while maintaining the actual formation temperature unchanged until the vertical principal stress value, the maximum horizontal stress value, the minimum horizontal stress value, and the confining pressure value in the environmental parameters are reached; While keeping the vertical principal stress, the maximum horizontal stress, the minimum horizontal stress and the confining pressure unchanged, the pore fluid pressure of the standard cube specimen is loaded to the pore fluid pressure value in the environmental parameters, and the experimental conditions are maintained for a preset time.

5. The method according to claim 2, characterized in that Determining the physical properties of the dense rock at the burial depth corresponding to the environmental parameters using the experimental data of the dense rock seepage experiment includes: The permeability of the dense rock at the burial depth corresponding to the environmental parameters is determined as a physical property parameter according to the following formula: Among them, K i is the permeability of dense rock at the actual burial depth, μ i is the dynamic viscosity coefficient of gas at the actual burial depth, β i is the gas volume compression coefficient at the actual burial depth, V is the reference volume, ΔP ii is the initial pore pressure difference at the actual burial depth, ΔP fi is the final pore pressure difference at the actual burial depth, Δt is the experimental time, ΔA s is the original cross-sectional area of ​​the standard cube specimen, ΔL s is the original length of the standard cube specimen, ΔP ii , ΔP fi and Δt are the experimental data of the dense rock seepage experiment.

6. The method according to claim 5, characterized in that The physical properties of the dense rock at the burial depth corresponding to the environmental parameters are determined based on the experimental data of the dense rock seepage experiment, including: The vertical strain, maximum horizontal principal strain, minimum horizontal principal strain, and volumetric strain of the dense rock at the burial depth corresponding to the environmental parameters are determined according to the following formulas as physical property calculation parameters: e V =e 1i +e 2i +e 3i ; Among them, ε 1i is the vertical strain, ε 2i is the maximum horizontal principal strain, ε 3i is the minimum horizontal principal strain, ε V is the volume strain, l 1i 、l 2i 、l 3i are the vertical displacement, maximum horizontal principal displacement and minimum horizontal principal displacement corresponding to the actual burial depth, respectively. 1i 、l 2i 、l 3i These are the experimental data of the dense rock seepage experiment.

7. The method according to claim 6, characterized in that The physical properties of the dense rock at the burial depth corresponding to the environmental parameters are determined based on the experimental data of the dense rock seepage experiment, including: The elastic modulus and Poisson's ratio of the dense rock at the burial depth corresponding to the environmental parameters are determined according to the following formula as physical property calculation parameters: Among them, ε 1i is the vertical strain, ε 2i is the maximum horizontal principal strain, ε 3i is the minimum horizontal principal strain, σ 1i is the vertical principal stress of dense rock at the actual burial depth, σ 2i is the maximum horizontal stress of dense rock at the actual burial depth, σ 3i is the minimum horizontal stress of dense rock at the actual burial depth, E is the elastic modulus, and μ is the Poisson's ratio.

8. A dynamic physical property testing device for dense rock under formation conditions, characterized in that: include: Environmental parameter determination module: used to pre-build a model based on real formation conditions and determine the environmental parameters corresponding to dense rocks at multiple burial depths; A physical property parameter determination module is configured to perform a dense rock seepage experiment according to the environmental parameters, and determine the physical property parameters of the dense rock at a burial depth corresponding to the environmental parameters based on experimental data of the dense rock seepage experiment; Target physical property parameter determination module: determines the dynamic relationship between rock physical property parameters and burial depth based on the physical property parameters corresponding to dense rocks at multiple burial depths, and determines the physical property parameters corresponding to dense rocks at the target burial depth based on the relationship between the rock physical property parameters and burial depth.

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 that can be executed 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 dynamic physical property testing method of tight rock under formation conditions according to any one of claims 1-7.

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 dynamic physical property testing of tight rock under formation conditions according to any one of claims 1 to 7 when executed.

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