Dynamic physical property testing method and device for compact rock under stratum condition and medium

Abstract

The invention discloses a method and a device for testing dynamic physical properties of compact rocks and a medium. The method comprises the following steps: according to a pre-constructed parameter model under a real stratum condition, determining environmental parameters corresponding to compact rocks at a plurality of buried depths; carrying out a dense rock seepage experiment according to the environmental parameters, and determining physical property parameters, corresponding to the environmental parameters, of the dense rock at the buried depth according to experimental data of the dense rock seepage experiment; and according to the physical property parameters corresponding to the compact rock at the multiple buried depths, determining a dynamic relationship between the physical property parameters of the rock and the buried depths, and further determining the physical property parameters corresponding to the compact rock at the target buried depth. The method is simple and easy to operate, the permeability and other properties of the rock sample can be accurately and reasonably calculated without drilling the rock sample which is buried deeply, and the dynamic quantitative test of the permeability of the compact rock with different buried depths under the stratum condition is realized.

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, shales, etc., 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] In the existing technology, for dense sandstone with a shallow burial depth (0-1500m), its physical properties can be obtained by drilling rock samples and then conducting experimental tests on the rock samples. However, for dense sandstone with a very large burial depth, such as a depth of more than 4000m, it is impossible to obtain rock samples by drilling, resulting in the lack of a better way to obtain its physical properties in the existing technology. Therefore, how to solve the problem of dynamic physical property testing of dense rocks under formation conditions is one of the technologies that urgently need to be tackled in current oil and gas exploration and development. Summary of the invention

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

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

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

[0007] Conducting 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 the experimental data of the dense rock seepage experiment;

[0008] According to the physical property parameters corresponding to dense rocks at multiple burial depths, the dynamic relationship between the rock physical property parameters and the rock burial depth is determined, and according to the relationship between the rock physical property parameters and the burial depth, the physical property parameters corresponding to the dense rocks at the target burial depth are determined.

[0009] According to another aspect of the present invention, a dynamic physical property testing device for 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 experiment 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, there is provided an electronic device, 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 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 method for dynamic physical property testing of dense 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 adopts dense sandstone that is easy to drill and has a shallow burial depth (0 to 1500m), and uses experiments to simulate the external environment of dense sandstone that is difficult to drill and has a very deep burial depth, and then infers the physical parameters such as permeability, triaxial strain, elastic modulus and Poisson's ratio of dense sandstone with a very deep burial depth (more than 4000m). The method is simple and easy 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 formations to the ground, and realizes the measurement of dynamic physical properties of deep-ultra-deep rocks under formation conditions, improves the accuracy of experimental measurement results, and thus reflects the characteristics of underground rock physical property parameters as realistically as possible. The method is simple and easy to operate, and can accurately and reasonably calculate the properties such as permeability of extremely deeply buried rock samples without drilling them, realizing dynamic quantitative testing of dense rock permeability at different burial depths under formation conditions.

[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 This is a flow chart of a method for testing dynamic physical properties of dense rocks under formation conditions provided according to Embodiment 1 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 the variation of the permeability of dense sandstone with the burial depth provided in Example 1 of the present invention;

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

[0025] Figure 5 A schematic diagram of the structure of an electronic device for implementing a method for testing dynamic physical properties of dense rocks 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 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.

[0027] It should be noted that the terms "candidate", "target", 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.

[0028] Embodiment 1

[0029] Figure 1 A flowchart of a method for testing the dynamic physical properties of dense rocks 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 rocks. The method can be performed by a dynamic physical property testing device for dense rocks under formation conditions. The dynamic physical property testing device for dense rocks under formation conditions can be implemented in the form of hardware and / or software. The dynamic physical property testing device for dense rocks 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 dense 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 depth.

[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] The model pre-built according to the real formation conditions can be a model that can realize the conversion of the actual detected environmental parameters of the dense rock at the burial depth into environmental parameters. For example, the model pre-built according to the real formation conditions can realize the conversion of the formation temperature corresponding to the dense rock, the pore fluid pressure corresponding to the dense rock, the vertical principal stress, the maximum horizontal stress, the minimum horizontal stress and the confining pressure.

[0035] Furthermore, by monitoring the dense sandstone at different sampleable burial depths, the vertical principal stress, maximum horizontal stress, minimum horizontal stress and confining pressure of the dense sandstone at different depths were obtained, and then a linear fit was performed on the obtained data 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 is:

[0041] P i =C1*H i

[0042] Among them, P i Corresponding to the burial depth H i The pore fluid pressure under the condition, 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 Corresponding to the burial depth Hi The vertical principal stress under the 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 is:

[0047] σ 2i =E1*H i

[0048] Where σ 2i Corresponding to the burial depth H i The maximum horizontal stress under the condition, 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 is:

[0050] σ 3i =F1*H i

[0051] Where σ 3i Corresponding to the burial depth H i The minimum horizontal stress under the condition, 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, different regions and different reservoirs have different minimum horizontal stress parameters. For example, F1=0.0153.

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

[0053] C pi =σ 3i

[0054] Where C pi Corresponding to the burial depth H i Confining pressure under, subscript i = 1, 2, 3, …, n.

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

[0056] Table 1 Environmental parameters of dense 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 through 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] According to the environmental parameters, the dense rock seepage experiment is carried out, and H is calculated based on the experimental data. i The 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] Drill a dense sandstone sample with a burial depth of H0, and process the dense sandstone sample at the burial depth H0 into a standard cubic specimen, wherein H0 is the initial burial depth. For example, in this embodiment, the length, width and height of the standard cubic specimen 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] Low viscosity fluid is a fluid with 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 The corresponding T i Stop heating and then keep the temperature constant.

[0071] Step S2, pressurizing the standard cubic specimen while keeping 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.

[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 cubic specimen, the standard cubic 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 the confining pressure reaches C pi .

[0073] Furthermore, the vertical principal stress, maximum horizontal principal stress and minimum horizontal principal stress are simultaneously controlled 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 continues to be pressurized to the set value, and 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, the maximum horizontal stress, the minimum horizontal stress and the confining pressure unchanged, the pore fluid pressure of the standard cubic 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 is also the duration required for the preset 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 continued to be unchanged, and the pore fluid pressure is loaded to the same value as H. i The corresponding value P i , and maintain the experimental conditions for 24h.

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

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

[0079] The shear wave may be a wave whose vibration direction of the dense sandstone is perpendicular to the wave propagation direction, and the shear wave velocity may be the speed at which the shear wave propagates in the reservoir. The longitudinal wave may be a wave whose vibration direction of the dense sandstone is parallel to the wave propagation direction, and the longitudinal wave velocity may be the speed at which the longitudinal wave propagates in the reservoir.

[0080] Optionally, the physical parameters of the dense rock at the burial depth corresponding to the environmental parameters are determined through experimental data of the 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 compression coefficient at the actual burial depth, where μ is the gas dynamic viscosity coefficient of the low-viscosity fluid at the burial depth 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 duration, ΔA s is the original cross-sectional area of ​​the standard cubic specimen, ΔL s is the original length of the standard cube specimen, ΔP ii , ΔP fi and Δt are the experimental data of dense rock seepage experiment.

[0084] Optionally, the physical parameters of the dense rock at the burial depth corresponding to the environmental parameters are determined through experimental data of the 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 formula:

[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 of dense rock seepage experiment.

[0091] Optionally, the physical parameters of the dense rock at the burial depth corresponding to the environmental parameters are determined through experimental data of the 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 property parameters and the burial depth according to the physical property parameters corresponding to the dense rock at multiple burial depths, and determine the physical property parameters corresponding to the dense rock at the target burial depth according to the dynamic relationship between the rock physical property parameters and the burial depth.

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

[0099] Furthermore, when the rock burial depth information of dense rocks at other burial depths in area S is needed, it can be obtained through Figure 2 , Figure 3 For example, suppose that the rock burial depth information of the dense rock at 2250m needs to be determined. 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 adopts dense sandstone that is 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 great burial depth, and then infers the physical parameters such as permeability, triaxial strain, elastic modulus and Poisson's ratio of dense sandstone with a great burial depth (more than 4000m). The method is simple and easy 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 formations to the ground, and realizes the measurement of dynamic physical properties of deep-ultra-deep rocks under formation conditions, improves the accuracy of experimental measurement results, and thus reflects the characteristics of underground rock physical property parameters as realistically as possible. The method also does not need to drill extremely deeply buried rock samples to accurately and reasonably calculate their permeability and other properties, and realizes dynamic quantitative testing of dense rock permeability at different burial depths under formation conditions.

[0101] Embodiment 2

[0102] Figure 4 A schematic diagram of a dynamic physical property testing device for dense rock under formation conditions provided in the third embodiment 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 comprises:

[0103] Environmental parameter determination module 210: used to pre-build a model according to the actual formation conditions and determine the environmental parameters corresponding to the 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 through the experimental data of the dense rock seepage experiment;

[0105] Target physical property parameter determination module 230: 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 of 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 under different environmental parameters on standard cubic specimens using low viscosity fluids.

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

[0110] Actual formation temperature value loading unit: used to heat up 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: It is 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 a 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 duration, ΔA s is the original cross-sectional area of ​​the standard cubic specimen, ΔL s is the original length of the standard cube specimen, ΔP ii , ΔP fi and Δt are the experimental data of dense 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 formula:

[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 of 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 in an embodiment of the present invention can execute the dynamic physical property testing method for dense rock under formation conditions provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to 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] Embodiment 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 testing the dynamic physical properties of dense rocks 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, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may 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.

[0135] like Figure 5As 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.

[0136] 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.

[0137] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a method for testing dynamic physical properties of tight rocks under formation conditions.

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

[0139] 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 reference products (ASSPs), systems on chips (SOCs), complex 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.

[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, 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.

[0141] 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.

[0142] 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).

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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 testing dynamic physical properties of dense rocks under formation conditions, characterized in that: The method includes: Pre-build models based on real formation conditions to determine environmental parameters corresponding to dense rocks at multiple burial depths; Conducting 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; According to 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 according to the dynamic relationship between the rock physical property parameters and the burial depth, the physical property parameters corresponding to the dense rocks at the target burial depth are determined.

2. The method according to claim 1, characterized in that: A dense rock seepage experiment is carried out according to the environmental parameters, including: 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 experiment was carried out 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 under different environmental parameters is performed on the standard cubic specimen using a low viscosity fluid, 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 keeping 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 cubic 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: The physical property parameters of the dense rock at the burial depth corresponding to the environmental parameters are determined by the experimental data of the dense rock seepage experiment, including: The permeability of dense rock at the burial depth corresponding to the environmental parameters is determined according to the following formula as a physical property parameter: 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 duration, ΔA s is the original cross-sectional area of ​​the standard cubic 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 property parameters of the dense rock at the burial depth corresponding to the environmental parameters are determined by 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 formula 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 property parameters of the dense rock at the burial depth corresponding to the environmental parameters are determined by 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: 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; Target physical property parameter determination module: Determine the dynamic relationship between rock physical property parameters and burial depth according to 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 according to 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 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 dynamic physical property testing of dense rock under formation conditions described in 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 testing dynamic physical properties of dense rocks under formation conditions according to any one of claims 1-7 when executed.

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