Hydraulic fracture crossing effect evaluation method, evaluation device, equipment and medium

Abstract

The invention relates to a hydraulic fracture crossing effect evaluation method, evaluation device, equipment and medium. The evaluation method comprises the following steps: establishing a three-dimensional plane hydraulic fracture model; establishing a reservoir coupling flow and geomechanical response model for simulating stress non-uniform spatio-temporal evolution in injection and output processes; establishing a stratum longitudinal and transverse stress heterogeneity model for simulating the influence of longitudinal stress and transverse stress heterogeneity on the hydraulic fracturing expansion process; establishing a crack propagation model; and solving to obtain crack propagation parameters. The influence of stress non-uniform spatio-temporal evolution in the injection and output process of fluid in a porous medium and the non-uniformity of longitudinal stress and transverse stress on the hydraulic fracturing extension process is fully considered, and the layer-crossing extension process of the hydraulic fracture under the geological condition of multi-layer thin interbed development can be accurately simulated. And the prediction precision of the crack crossing expansion effect is remarkably improved, so that a scientific basis is provided for reasonable design and optimization of the crack.

Description

Technical Field

[0001] The present application relates to the technical field of rock mechanics and petroleum engineering, and in particular to a method, device, computer equipment and computer-readable storage medium for evaluating the penetration effect of hydraulic fractures. Background Art

[0002] In the development of unconventional oil and gas resources such as shale gas, hydraulic fracturing is widely used as a major production-increasing technology. However, the expansion behavior of hydraulic fractures in the formation interface is affected by many factors, such as in situ stress difference, elastic parameter difference, fracture toughness difference, interface strength, fracturing fluid pressure distribution, etc. The understanding and effective control of these factors directly affect the generation and expansion effect of hydraulic fractures, thereby affecting the efficiency and success rate of oil and gas production. If the hydraulic fractures cannot effectively penetrate the layers, it may affect the development effect of oil and gas resources, and even cause some oil and gas resources to be unable to be effectively exploited. The evaluation of the penetration effect of hydraulic fractures can help engineers better predict and evaluate the effect of hydraulic fracturing technology, thereby better optimizing the fracturing scheme and improving the efficiency and success rate of oil and gas production. At the same time, through in-depth research on the penetration law of hydraulic fractures, it can also provide important theoretical basis and technical support for the engineering design of unconventional oil and gas resource development.

[0003] The mainstream technology for evaluating the penetration and expansion effect of hydraulic fractures usually uses empirical formulas or traditional mechanism models. The empirical formula evaluation method is based on a large amount of experimental data, and the relationship between parameters such as fracture length and width and factors such as fracturing fluid properties and rock mechanics parameters is obtained through fitting. However, this method relies more on experimental data and field data. When dealing with complex geological conditions or construction processes, its accuracy and applicability will be reduced. Traditional mechanism models usually assume that rocks are homogeneous and isotropic materials, and the fracture expansion process is only controlled by a single rock mechanics parameter. Such a model ignores the influence of factors such as formation thickness, rock mechanics properties, and stress field during the fracture penetration process, and it is also difficult to accurately predict the penetration and expansion effect of fractures.

[0004] The accuracy and reliability of these existing technologies need to be improved when dealing with complex geological conditions, multiple parameters and other issues. In particular, for complex geological conditions such as multi-layer systems and thin interlayer development in continental shale oil reservoirs, existing evaluation methods are difficult to meet actual needs. Secondly, the accuracy of existing evaluation methods in dealing with issues such as fluid flow in fractures, interaction between fracturing fluid and rock, and geomechanical response needs to be improved. Therefore, a new evaluation method is needed that can take into account complex geological conditions such as multi-layer systems and thin interlayer development, and can deal with fluid flow in fractures, interaction between fracturing fluid and rock, and heterogeneous mechanical properties, so as to improve the prediction accuracy and scope of application of fracture penetration and expansion effects. Summary of the invention

[0005] Based on this, it is necessary to provide a hydraulic fracture penetration effect evaluation method, device, computer equipment and computer-readable storage medium with relatively good accuracy and applicability, which can more accurately predict the penetration effect of fractures and have relatively good reliability.

[0006] In a first aspect, the present application provides a method for evaluating the penetration effect of hydraulic fractures, comprising the following steps:

[0007] Establish a three-dimensional planar hydraulic fracturing model to simulate the formation and expansion of cracks during hydraulic fracturing;

[0008] Establish a reservoir coupled flow and geomechanical response model to simulate the inhomogeneous temporal and spatial evolution of stress during the injection and production process of fluids in porous media;

[0009] Establish a model of vertical and horizontal stress heterogeneity in the formation to simulate the impact of vertical and horizontal stress heterogeneity on the hydraulic fracturing expansion process;

[0010] Based on the three-dimensional hydraulic fracturing model and the reservoir coupled flow and geomechanical response model, and by introducing the non-uniform conditions of longitudinal stress and transverse stress in the formation longitudinal and transverse stress non-uniformity model, a fracture propagation model is established according to formation parameters and stress conditions.

[0011] The crack propagation model is numerically solved to obtain the crack propagation parameters under different stress inhomogeneity conditions.

[0012] In one embodiment, the expansion parameters include the expansion speed, expansion length, expansion height and expansion direction of the crack.

[0013] In one embodiment, the step of establishing a three-dimensional planar hydraulic fracturing model includes:

[0014] Establish an initial three-dimensional stratigraphic model;

[0015] Obtaining initial crack parameters, including the initial position, size and opening pressure of the crack;

[0016] Based on the initial fracture parameters, the initial three-dimensional formation model is subjected to elastic deformation simulation, the behavior of the fracture under elastic deformation is simulated, and the fracture deformation parameters are determined;

[0017] According to the fracture deformation parameters, the physical property parameters of the formation and the fracturing fluid, the expansion behavior of the fracture under continuous stress is simulated to obtain the fracture simulation behavior data;

[0018] By comparing the actual observation data of the fractures with the simulated fracture behavior data, the fracture deformation parameters and the initial three-dimensional formation model are optimized through the actual observation data to obtain an optimized three-dimensional planar hydraulic fracturing model.

[0019] In one embodiment, the step of establishing a reservoir coupled flow and geomechanical response model includes:

[0020] Establish a reservoir model to reflect the pore structure, porosity, permeability, and formation pressure characteristics of the reservoir;

[0021] Obtain simulation fluid parameters, including fluid type, fluid physical properties, fluid injection and production rate and pressure;

[0022] According to the simulated fluid parameters, a reservoir model is used to simulate the flow behavior of the fluid in the porous medium;

[0023] Based on the flow behavior, a linear elastic constitutive model is used to simulate the impact of fluid flow on geomechanics.

[0024] In one embodiment, the step of establishing the vertical and lateral stress heterogeneity model of the formation includes:

[0025] Determine longitudinal and transverse stress non-uniformity, where longitudinal stress non-uniformity refers to stress variations in the thickness of the formation and transverse stress non-uniformity refers to stress variations in the horizontal direction of the formation;

[0026] Simulate the impact of stress heterogeneity on hydraulic fracturing, establish vertical and horizontal stress heterogeneity models of the formation, and simulate the formation and expansion of cracks under different stress heterogeneity conditions.

[0027] In one embodiment, after the step of numerically solving the crack propagation model to obtain the crack propagation parameters under different stress inhomogeneous conditions, the evaluation method further comprises the following steps:

[0028] The expansion parameters of real hydraulic fracturing cases are obtained, and the fracture expansion model is trained to optimize the model parameters of the fracture expansion model.

[0029] In one embodiment, the evaluation method is used to evaluate the hydraulic fracture penetration effect of continental shale oil reservoirs.

[0030] In a second aspect, the present application provides a hydraulic fracture penetration effect evaluation device, the device comprising:

[0031] A three-dimensional plane hydraulic fracturing model building module is used to build a three-dimensional plane hydraulic fracturing model to simulate the formation and expansion of cracks during hydraulic fracturing;

[0032] A reservoir coupled flow and geomechanical response modeling module is used to simulate the non-uniform spatiotemporal evolution of stress during the injection and production process of fluids in porous media;

[0033] A module for establishing a model of vertical and horizontal stress heterogeneity in formations, which is used to establish a model of vertical and horizontal stress heterogeneity in formations to simulate the influence of vertical and horizontal stress heterogeneity on the hydraulic fracturing expansion process;

[0034] A fracture extension model building module is used to build a fracture extension model based on the three-dimensional hydraulic fracturing model and the reservoir coupled flow and geomechanical response model, and introduce the non-uniform conditions of longitudinal stress and transverse stress in the formation longitudinal and transverse stress non-uniformity model, and according to the formation parameters and stress conditions;

[0035] The crack extension model solving module is used to numerically solve the crack extension model and obtain the crack extension parameters under different stress inhomogeneous conditions.

[0036] In a third aspect, the present application provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the evaluation method described in any of the above embodiments are implemented.

[0037] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the evaluation method described in any of the above embodiments are implemented.

[0038] The above-mentioned hydraulic fracture penetration effect evaluation method is used to simulate the formation and expansion of fractures during hydraulic fracturing by establishing a three-dimensional plane hydraulic fracturing model; to simulate the stress inhomogeneous spatiotemporal evolution of fluid injection and production in porous media by establishing a reservoir coupled flow and geomechanical response model; to simulate the influence of longitudinal and transverse stress inhomogeneity on the hydraulic fracturing expansion process by establishing a formation longitudinal and transverse stress inhomogeneity model; and then to establish a fracture expansion model, numerically solve the fracture expansion model, and obtain the fracture expansion parameters under different stress inhomogeneity conditions. In this way, the stress inhomogeneous spatiotemporal evolution of fluid injection and production in porous media and the influence of longitudinal and transverse stress inhomogeneity on the hydraulic fracturing expansion process are fully considered, and the penetration expansion process of hydraulic fractures under geological conditions with multi-layer thin interlayer development can be accurately simulated, which significantly improves the prediction accuracy of fracture penetration expansion effect, thereby providing a scientific basis for the reasonable design and optimization of fractures. By simulating the penetration expansion of hydraulic fractures under geological conditions with multi-layer thin interlayer development, the prediction accuracy of penetration expansion effect can be improved. This evaluation method takes into account complex geological conditions such as the development of multiple layers and thin interlayers, and can handle the fluid flow in the fractures, the interaction between the fracturing fluid and the rock, and the heterogeneous mechanical properties, so as to improve the prediction accuracy and scope of application of the fracture penetration effect, thereby making the hydraulic fracture penetration effect evaluation method relatively accurate and applicable. It is especially suitable for complex geological conditions such as multiple layers and thin interlayers in continental shale oil reservoirs. It can handle the fluid flow in the fractures, the interaction between the fracturing fluid and the rock, and the heterogeneous mechanical properties, and can more accurately predict the fracture penetration effect. It has relatively good reliability and a relatively wide range of applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the steps of a method for evaluating the penetration effect of hydraulic fractures according to an embodiment;

[0040] Figure 2 A plane non-uniform stress characterization diagram of a shale oil reservoir hydraulic fracture penetration effect evaluation method obtained by an embodiment of the present invention;

[0041] Figure 3 A schematic diagram of the module structure of a hydraulic fracture penetration effect evaluation device according to an embodiment;

[0042] Figure 4 FIG. 1 is a schematic diagram of the structure of a computer device in an embodiment. DETAILED DESCRIPTION

[0043] In order to facilitate the understanding of the present application, in order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application, and the preferred implementation methods of the present application are given in the accompanying drawings. However, the present application can be implemented in many different forms and is not limited to the implementation methods described herein. On the contrary, the purpose of providing these implementation methods is to make the disclosure of the present application more thoroughly and comprehensively understood. The present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited to the specific embodiments disclosed below. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present application. The terms used herein are only for the purpose of describing specific implementation methods and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0044] In a first aspect, the present application provides a method for evaluating the penetration effect of hydraulic fractures, comprising the following steps:

[0045] S110: Establish a three-dimensional plane hydraulic fracturing model to simulate the formation and expansion of cracks during hydraulic fracturing;

[0046] In this embodiment, a three-dimensional planar hydraulic fracturing model is established to simulate the formation and expansion of cracks during the hydraulic fracturing process.

[0047] Specifically, the three-dimensional plane hydraulic fracturing model is a three-dimensional plane hydraulic fracturing model used to simulate the formation and expansion of cracks. In this model, a method of opening cracks under elastic deformation and quasi-static momentum balance is adopted, which can accurately simulate the formation and expansion of cracks in the hydraulic fracturing process while considering the elastic deformation and quasi-static momentum balance of the cracks. In other words, the three-dimensional plane hydraulic fracturing model adopts a method of opening cracks under elastic deformation and quasi-static momentum balance.

[0048] In one embodiment, the step of establishing a three-dimensional planar hydraulic fracturing model includes steps s111 to s115, which are specifically as follows:

[0049] s111: Establish initial three-dimensional stratigraphic model;

[0050] In this embodiment, an initial model is created: before starting to use the three-dimensional planar hydraulic fracturing model, the stratum needs to be initially modeled. At this stage, a preliminary three-dimensional stratum model is created based on the physical properties and geological structure of the stratum. This initial model will serve as the basis for subsequent fracture formation and expansion simulations. Specifically, the physical properties of the stratum mainly include porosity, permeability, elastic modulus, and Poisson's ratio. These properties are related to the material composition and structure of the stratum and will affect the fracturing performance of the stratum. The geological structure of the stratum includes the thickness, occurrence, rock type, mineral composition, structure, and structure of the stratum, as well as the contact relationship between the strata. These geological structural characteristics will affect the physical and chemical properties of the stratum, thereby affecting the effect of the fracturing operation.

[0051] s112: Obtain initial crack parameters, including the initial position, size and opening pressure of the crack;

[0052] In this embodiment, the fracture parameters are initialized. After the initial model is established, the parameters of the initial fracture need to be set, including the initial position, size and opening pressure of the fracture. These parameters are determined based on the physical properties of the formation and the expected opening pressure of the fracture.

[0053] s113: Based on the initial fracture parameters, an elastic deformation simulation is performed on the initial three-dimensional formation model to simulate the behavior of the fracture under elastic deformation and determine the fracture deformation parameters;

[0054] In this embodiment, elastic deformation simulation is performed. After initializing the fracture parameters, the next step is to simulate the behavior of the fracture under elastic deformation. The elastic deformation model under quasi-static momentum balance is adopted, and the contact between the fracture surfaces, the interaction between the fracture surfaces and the fluid, and the influence of the fracture extension on the physical properties of the formation are considered to simulate the behavior of the fracture under elastic deformation and determine the fracture deformation parameters. For example, the step s113 is specifically as follows: based on the initial fracture parameters, the elastic deformation simulation under quasi-static momentum balance is performed on the initial three-dimensional formation model, the behavior of the fracture under elastic deformation is simulated, and the fracture deformation parameters are determined.

[0055] s114: According to the fracture deformation parameters, the physical property parameters of the formation and the fracturing fluid, the expansion behavior of the fracture under continuous stress is simulated to obtain the fracture simulation behavior data;

[0056] In this embodiment, when the crack begins to open, the crack expansion process needs to be simulated. In this step, the crack expansion behavior under continuous stress is simulated based on the crack deformation parameters calculated in the previous step and the physical properties of the formation and the fracturing fluid.

[0057] Specifically, the physical properties of the formation include porosity, permeability, elastic modulus, Poisson's ratio, etc., where the porosity of the formation refers to the ratio of the volume of the pore space in the rock to the total volume of the rock. Porosity determines the ability of the formation to accommodate fluids. The permeability of the formation refers to the ability of the fluid to pass through the formation rock. Permeability is an important indicator for evaluating whether a formation can be fractured. The elastic modulus of the formation refers to the degree to which the formation deforms when subjected to pressure. Formations with higher elastic moduli are more likely to produce cracks during fracturing, but they also require higher pressure. The Poisson's ratio of the formation refers to the ratio of the degree of lateral contraction of the formation when subjected to pressure to the degree of longitudinal contraction. Formations with high Poisson's ratios are more likely to produce cracks during fracturing.

[0058] Specifically, the physical properties of fracturing fluid include viscosity, density, surface tension, fluid loss, friction, temperature resistance, shear resistance, etc., among which the viscosity of fracturing fluid is an important indicator to measure its fluidity. Fracturing fluid with high viscosity is more effective in transmitting pressure, but it also requires higher pumping pressure. The density of fracturing fluid is an indicator to measure its weight and is related to the pressure balance of the formation. The surface tension of fracturing fluid is an indicator to measure its ability to interact with the formation rock. Fracturing fluid with moderate surface tension can reduce the formation of droplets and the rupture of liquid film. The fluid loss of fracturing fluid refers to the degree of fluid loss when passing through the formation. Fracturing fluid with moderate fluid loss can ensure the permeability of the liquid phase. The friction of fracturing fluid refers to the resistance it encounters during flow. Fracturing fluid with low friction requires less energy during pumping. The temperature resistance and shear resistance of fracturing fluid are its ability to maintain stable performance during use. Fracturing fluid that can remain stable under high temperature, high pressure, deep well and other conditions can improve the success rate of fracturing operations.

[0059] s115: Compare the actual observation data of the fractures with the fracture simulation behavior data, optimize the fracture deformation parameters and the initial three-dimensional formation model through the actual observation data, and obtain the optimized three-dimensional planar hydraulic fracturing model.

[0060] In this embodiment, after simulating the crack propagation process, the accuracy of the model is evaluated by comparing it with the actual observation data. If there is a deviation between the model prediction and the actual observation results, the model parameters will be adjusted and optimized to improve the accuracy of the model.

[0061] S120: Establish a reservoir coupled flow and geomechanical response model to simulate the non-uniform spatiotemporal evolution of stress during the injection and production process of fluids in porous media;

[0062] In this embodiment, the reservoir coupled flow and geomechanical response model can simulate the injection and production process of fluid in porous media, as well as the resulting non-uniform spatiotemporal evolution of stress. In this model, porous media flow and linear elastic constitutive law are considered, which can solve the problem of fluid injection / production process in porous media and the resulting non-uniform evolution of stress.

[0063] In one embodiment, the step of establishing a reservoir coupled flow and geomechanical response model includes the following steps s121 to s124, specifically:

[0064] s121: Establish a reservoir model to reflect the pore structure, porosity, permeability and formation pressure characteristics of the reservoir;

[0065] In this embodiment, the reservoir model is initialized. Before starting to use the reservoir coupled flow and geomechanical response model, a reservoir model needs to be established first. The model needs to reflect the main geological and physical properties of the reservoir, such as pore structure, porosity, permeability, formation pressure, etc.

[0066] s122: Get the simulated fluid parameters, including fluid type, fluid physical properties, fluid injection and output speed and pressure;

[0067] In this embodiment, after setting the fluid parameters and initializing the reservoir model, the parameters of the simulated fluid are set, including the type of fluid (water, oil, gas), the physical properties of the fluid (such as viscosity, density), and the injection / production rate and pressure of the fluid. These parameters need to be set according to the actual hydraulic fracturing process and the actual properties of the fluid.

[0068] s123: Based on the simulated fluid parameters, a reservoir model is used to simulate the flow behavior of fluid in porous media;

[0069] In this embodiment, after setting the fluid parameters, the reservoir coupled flow model is used to simulate the flow behavior of the fluid in the porous medium. The physical properties of the fluid, the interaction between the fluid and the porous medium, and the influence of the physical conditions of the formation on the fluid flow are taken into account.

[0070] s124: Simulate the effects of fluid flow on geomechanics using a linear elastic constitutive model based on flow behavior.

[0071] In this embodiment, step s124 is the simulation of geomechanical response, which is achieved by simulating the effect of fluid flow on geomechanics, i.e., geomechanical response. This process mainly simulates the effect of fluid flow on reservoir stress field, and the effect of stress field change on fracture development. Specifically, a linear elastic constitutive model is used to simulate this process.

[0072] S130: Establishing a model of vertical and horizontal stress heterogeneity of the formation to simulate the influence of vertical and horizontal stress heterogeneity on the hydraulic fracturing expansion process;

[0073] In this embodiment, the influence of two types of stress inhomogeneity, longitudinal and transverse, on the hydraulic fracturing expansion process is considered. This innovative technical concept is a supplement to the existing hydraulic fracturing simulation technology. The model shows that these two types of stress inhomogeneity have an important influence on the actual hydraulic fracturing process, and they have a decisive influence on the expansion mode and morphology of the cracks.

[0074] In one embodiment, the step of establishing the vertical and horizontal stress heterogeneity model of the formation includes the following steps s131 to s132, specifically:

[0075] s131: Determine longitudinal and transverse stress non-uniformity, where longitudinal stress non-uniformity refers to the stress variation in the thickness direction of the formation, and transverse stress non-uniformity refers to the stress variation in the horizontal direction of the formation;

[0076] In this embodiment, stress non-uniformity is first defined: First, longitudinal and transverse stress non-uniformity are defined. Longitudinal stress non-uniformity refers to the stress variation in the thickness direction of the formation, while transverse stress non-uniformity refers to the stress variation in the horizontal direction of the formation. The size and distribution of stress non-uniformity are affected by factors such as the physical properties of the formation (such as rock hardness, porosity and permeability), the formation structure (such as faults), and the historical stress conditions of the formation.

[0077] s132: Simulate the impact of stress heterogeneity on hydraulic fracturing, establish vertical and horizontal stress heterogeneity models of the formation, and simulate the formation and expansion of cracks under different stress heterogeneity conditions.

[0078] In this embodiment, the effect of stress non-uniformity on hydraulic fracturing must first be considered: during hydraulic fracturing, stress non-uniformity will affect the formation and expansion of cracks. The formation of cracks is mainly controlled by the maximum and minimum principal stresses, while the expansion of cracks is affected by the stress gradient. When stress non-uniformity increases, irregularities in the formation and expansion of cracks may occur, which has an important impact on the effect of hydraulic fracturing.

[0079] In this embodiment, the influence of stress non-uniformity on hydraulic fracturing is simulated: in the model, stress non-uniformity is simulated as a key factor. By analyzing the stress conditions of the formation, the formation and expansion of cracks under different stress non-uniformity conditions can be simulated, and the effect of hydraulic fracturing can be predicted.

[0080] In one of the embodiments, after simulating the effect of stress heterogeneity on hydraulic fracturing, it also includes using actual cases to verify and correct the vertical and lateral stress heterogeneity model of the formation, thereby ensuring that the model is more accurate.

[0081] S140: Based on the three-dimensional hydraulic fracturing model and the reservoir coupled flow and geomechanical response model, and introducing the non-uniform conditions of longitudinal stress and transverse stress in the formation longitudinal and transverse stress non-uniformity model, a fracture propagation model is established according to the formation parameters and stress conditions;

[0082] In this embodiment, by introducing the technical concept and method of steps S110-S130, the numerical model can effectively solve the complex problem of hydraulic fracture height and fracture length expansion under the condition of non-uniform longitudinal and transverse stress. This provides strong theoretical support for optimizing the hydraulic fracturing process, and can improve the control of the hydraulic fracturing process of continental shale oil and help optimize the process parameters.

[0083] Specifically, the crack extension model is established as follows:

[0084] s141: Introducing stress inhomogeneity: When solving the fracture extension problem, the longitudinal and transverse stress inhomogeneity conditions are first introduced. When modeling, anisotropic and isotropic stress conditions are considered, and different stress fields are set for different formations.

[0085] s142: Establish a fracture extension model: According to the hydraulic fracturing mechanics, a numerical model of fracture extension is established. It can simulate the longitudinal and lateral expansion process of fractures according to the input formation parameters and stress conditions.

[0086] Specifically, the hydraulic fracturing mechanics mechanism can be considered together with the hydraulic fracturing mechanics mechanism obtained from the three-dimensional plane hydraulic fracturing model and the reservoir coupled flow and geomechanical response model as well as the vertical and horizontal stress heterogeneity model of the formation.

[0087] Specifically, formation parameters usually include the geological age, paleontological characteristics, rock type, mineral composition, structure, tectonics, geochemical characteristics, etc., as well as geophysical characteristics related to the formation, such as resistivity, potential, magnetic field, etc. Specifically, formation stress conditions refer to the stress state existing in rock formations, including the type of ground stress, distribution law, cause of generation and impact on engineering.

[0088] S150: numerically solve the crack propagation model to obtain crack propagation parameters under different stress inhomogeneity conditions.

[0089] In one embodiment, the expansion parameters include the expansion speed, expansion length, expansion height and expansion direction of the crack. In this embodiment, after the model is established, a numerical method is used to solve the crack expansion. By calculating the expansion speed, expansion length, expansion height and expansion direction of the crack, the expansion of the crack under different stress inhomogeneous conditions can be obtained.

[0090] In one embodiment, after the step of numerically solving the crack propagation model to obtain the crack propagation parameters under different stress inhomogeneous conditions, the evaluation method further comprises the following steps:

[0091] The expansion parameters of real hydraulic fracturing cases are obtained, and the fracture expansion model is trained to optimize the model parameters of the fracture expansion model.

[0092] In this embodiment, after the solution is completed, the model results are compared with actual hydraulic fracturing cases to verify the accuracy and reliability of the model. The optimal hydraulic fracturing parameters, including injection pressure, injection flow rate, fracturing fluid volume, etc., under different stress inhomogeneity conditions are obtained through model solution and verification, so as to optimize the hydraulic fracturing process.

[0093] The above-mentioned hydraulic fracture penetration effect evaluation method is used to simulate the formation and expansion of fractures during hydraulic fracturing by establishing a three-dimensional plane hydraulic fracturing model; to simulate the stress inhomogeneous spatiotemporal evolution of fluid injection and production in porous media by establishing a reservoir coupled flow and geomechanical response model; to simulate the influence of longitudinal and transverse stress inhomogeneity on the hydraulic fracturing expansion process by establishing a formation longitudinal and transverse stress inhomogeneity model; and then to establish a fracture expansion model, numerically solve the fracture expansion model, and obtain the fracture expansion parameters under different stress inhomogeneity conditions. In this way, the stress inhomogeneous spatiotemporal evolution of fluid injection and production in porous media and the influence of longitudinal and transverse stress inhomogeneity on the hydraulic fracturing expansion process are fully considered, and the penetration expansion process of hydraulic fractures under geological conditions with multi-layer thin interlayer development can be accurately simulated, which significantly improves the prediction accuracy of fracture penetration expansion effect, thereby providing a scientific basis for the reasonable design and optimization of fractures. By simulating the penetration expansion of hydraulic fractures under geological conditions with multi-layer thin interlayer development, the prediction accuracy of penetration expansion effect can be improved. This evaluation method takes into account complex geological conditions such as the development of multiple layers and thin interlayers, and can handle the fluid flow in the fractures, the interaction between the fracturing fluid and the rock, and the heterogeneous mechanical properties, so as to improve the prediction accuracy and scope of application of the fracture penetration effect, thereby making the hydraulic fracture penetration effect evaluation method relatively accurate and applicable. It is especially suitable for complex geological conditions such as multiple layers and thin interlayers in continental shale oil reservoirs. It can handle the fluid flow in the fractures, the interaction between the fracturing fluid and the rock, and the heterogeneous mechanical properties, and can more accurately predict the fracture penetration effect. It has relatively good reliability and a relatively wide range of applicability.

[0094] In one embodiment, the evaluation method is used to evaluate the penetration effect of hydraulic fractures in continental shale oil reservoirs. In other words, the evaluation method of the present application is particularly suitable for complex geological conditions such as multi-layer systems and thin interlayer development in continental shale oil reservoirs, and can handle fluid flow in fractures, the interaction between fracturing fluid and rock, and heterogeneous mechanical properties. It can more accurately predict the penetration effect of fractures, has relatively good reliability, and is relatively widely applicable.

[0095] It should be noted that the technical means and technical concepts of the present invention are intended to provide a more efficient and accurate method for simulating the hydraulic fracturing process. This method can not only improve the effect of hydraulic fracturing in continental shale oil reservoirs, but also provide important theoretical support for optimizing the hydraulic fracturing process. All technical concepts and methods of the present invention are based on a deep understanding and improvement of the prior art and have certain innovation.

[0096] During hydraulic fracturing, fracturing fluid is injected into the well under high pressure, causing cracks in the formation. The generation and expansion of cracks are jointly affected by the physical properties of the formation rock (such as elastic modulus, Poisson's ratio), the flow properties of the fracturing fluid in the crack (such as viscosity, flow rate), and the interaction between the fracturing fluid and the formation rock (such as the permeability of the fracturing fluid to the rock, the friction between the fracturing fluid and the rock). In order to simulate this process more accurately, the model takes these factors into account and reflects the real properties of the formation rock and the fracturing fluid as much as possible. In particular, under the influence of stress heterogeneity, the shape and expansion direction of the cracks will change significantly. By introducing a model that considers stress heterogeneity, this process can be simulated more realistically and provide important theoretical support for optimizing the fracturing process.

[0097] In addition, in order to better utilize the model of the present invention, the invention provides a set of detailed implementation steps. First, according to the physical properties of the formation rock and the flow properties of the fracturing fluid, appropriate model parameters are selected. Then, by solving the coupling equations of the three-dimensional plane hydraulic fracturing model and the reservoir coupled flow and geomechanical response model, the shape and size of the cracks are calculated. Finally, by comparing the calculated results with the actual observation results, the model is adjusted and optimized to achieve the best simulation effect.

[0098] The evaluation method and device can accurately simulate the penetration and extension process of hydraulic fractures under geological conditions with multi-layer thin interlayers, significantly improving the prediction accuracy of the penetration and extension effect of fractures, thereby providing a scientific basis for the rational design and optimization of fractures.

[0099] The present application will be further described below in conjunction with specific embodiments.

[0100] Example 1

[0101] A method for evaluating the penetration effect of hydraulic fractures is provided to deeply analyze the influence of the minimum principal stress heterogeneity on the penetration extension of hydraulic fractures. To achieve this goal, the invention adopts a unique modeling and analysis process, which is the core technical concept of the invention and includes the following main contents:

[0102] (1) Three-dimensional planar hydraulic fracturing model. This is one of the key technical means in the present invention, which is used to simulate the formation and expansion of cracks. In this model, a method of opening cracks under elastic deformation and quasi-static momentum balance is adopted, which can accurately simulate the formation and expansion of cracks during hydraulic fracturing while considering the elastic deformation and quasi-static momentum balance of the cracks.

[0103] The specific steps are:

[0104] ① Create an initial model: Before starting to use the 3D planar hydraulic fracturing model, you first need to perform initial modeling of the formation. At this stage, create a preliminary 3D formation model based on the physical properties and geological structure of the formation. This initial model will serve as the basis for subsequent fracture formation and expansion simulations.

[0105] ② Initialize fracture parameters: After the initial model is established, the parameters of the initial fracture need to be set, including the initial position, size and opening pressure of the fracture. These parameters are determined based on the physical properties of the formation and the expected opening pressure of the fracture.

[0106] ③Simulation of elastic deformation: After initializing the fracture parameters, the next step is to simulate the behavior of the fracture under elastic deformation. The elastic deformation model under quasi-static momentum balance is adopted to simulate the behavior of the fracture under elastic deformation by considering the contact between the fracture surfaces, the interaction between the fracture surfaces and the fluid, and the influence of the fracture extension on the physical properties of the formation.

[0107] ④Simulate crack expansion: When the crack begins to open, it is necessary to simulate the crack expansion process. In this step, based on the crack deformation parameters calculated in the previous step, as well as the physical properties of the formation and fracturing fluid, the crack expansion behavior under continuous stress is simulated.

[0108] ⑤Evaluate and optimize the model: After simulating the crack propagation process, the accuracy of the model is evaluated by comparing it with the actual observation data. If there is a deviation between the model's prediction and the actual observation results, the model parameters will be adjusted and optimized to improve the accuracy of the model.

[0109] (2) Reservoir coupled flow and geomechanical response model. This model is another key technical means that can simulate the injection and production process of fluids in porous media, as well as the resulting non-uniform temporal and spatial evolution of stress. In this model, porous media flow and linear elastic constitutive law are considered, which can solve the problem of fluid injection / production process in porous media and the resulting non-uniform evolution of stress.

[0110] The specific steps are:

[0111] ① Initialize the reservoir model: Before using the reservoir coupled flow and geomechanical response model, you first need to establish a reservoir model. The model needs to reflect the main geological and physical characteristics of the reservoir, such as pore structure, porosity, permeability, formation pressure, etc.

[0112] ② Set fluid parameters: After initializing the reservoir model, set the parameters of the simulated fluid, including the type of fluid (water, oil, gas), fluid properties (such as viscosity, density), and fluid injection / production rate and pressure. These parameters need to be set according to the actual hydraulic fracturing process and the actual characteristics of the fluid.

[0113] ③Simulation of fluid flow: After setting the fluid parameters, the reservoir coupled flow model is used to simulate the flow behavior of the fluid in the porous medium. The physical properties of the fluid, the interaction between the fluid and the porous medium, and the influence of the physical conditions of the formation on the fluid flow are taken into account.

[0114] ④Simulation of geomechanical response: Simulate the effect of fluid flow on geomechanics, i.e. geomechanical response. This process mainly simulates the effect of fluid flow on reservoir stress field and the effect of stress field change on fracture development. Linear elastic constitutive model is used to simulate this process.

[0115] (3) Vertical and horizontal stress inhomogeneities of the formation. In the present invention, the influence of vertical and horizontal stress inhomogeneities on the hydraulic fracturing expansion process is considered. This innovative technical concept is a supplement to the existing hydraulic fracturing simulation technology. The model shows that these two types of stress inhomogeneities have an important influence on the actual hydraulic fracturing process, and they have a decisive influence on the expansion mode and morphology of the fractures.

[0116] The specific steps are as follows:

[0117] ①Define stress heterogeneity: First, define longitudinal and transverse stress heterogeneity. Longitudinal stress heterogeneity refers to the stress variation in the thickness direction of the formation, while transverse stress heterogeneity refers to the stress variation in the horizontal direction of the formation. The size and distribution of stress heterogeneity are affected by factors such as the physical properties of the formation (such as rock hardness, porosity and permeability), the formation structure (such as faults), and the historical stress conditions of the formation.

[0118] ②The impact of stress heterogeneity on hydraulic fracturing: During hydraulic fracturing, stress heterogeneity will affect the formation and expansion of cracks. The formation of cracks is mainly controlled by the maximum and minimum principal stresses, while the expansion of cracks is affected by the stress gradient. When stress heterogeneity increases, it may cause irregularities in the formation and expansion of cracks, which has an important impact on the effect of hydraulic fracturing.

[0119] ③Simulate the impact of stress heterogeneity on hydraulic fracturing: In the model, stress heterogeneity is simulated as a key factor. By analyzing the stress conditions of the formation, we can simulate the formation and expansion of cracks under different stress heterogeneity conditions, and then predict the effect of hydraulic fracturing.

[0120] ④Verify the model using actual cases.

[0121] (4) Solution for fracture extension under strong stress heterogeneity. By introducing the above technical concepts and methods, the numerical model can effectively solve the complex problem of hydraulic fracture height and length extension under longitudinal and transverse stress heterogeneity. This provides strong theoretical support for optimizing hydraulic fracturing technology, and can improve the control of hydraulic fracturing process of continental shale oil and help optimize process parameters.

[0122] The specific steps are as follows:

[0123] ①Introducing stress non-uniform conditions: When solving the fracture extension problem, the longitudinal and transverse stress non-uniform conditions are first introduced. When modeling, anisotropic and isotropic stress conditions are considered, and different stress fields are set for different formations.

[0124] ② Establish a fracture extension model: According to the hydraulic fracturing mechanics, a numerical model of fracture extension is established. It can simulate the longitudinal and lateral expansion process of fractures according to the input formation parameters and stress conditions.

[0125] ③ Solving crack expansion: After the model is established, numerical methods are used to solve crack expansion. By calculating the crack expansion speed, expansion length, expansion height and expansion direction, the crack expansion under different stress inhomogeneous conditions can be obtained.

[0126] ④ Model verification: After the solution is completed, the model results are compared with actual hydraulic fracturing cases to verify the accuracy and reliability of the model.

[0127] ⑤ Process parameter optimization: Through the solution and verification of the model, the optimal hydraulic fracturing parameters under different stress non-uniform conditions, including injection pressure, injection flow, fracturing fluid volume, etc., are obtained, so as to optimize the hydraulic fracturing process.

[0128] Evaluation method verification: In the actual operation of evaluating the penetration effect of hydraulic fractures in a shale oil reservoir in Gaoyou Depression, Figure 2 The above diagram is a plane non-uniform stress characterization diagram of the hydraulic fracture penetration effect of a shale oil reservoir obtained based on the hydraulic fracture penetration effect evaluation method of the present application. Using the evaluation method of the present invention, a prediction result of the fracture penetration effect that is very close to the actual observation data is obtained, which provides a quantitative reference for the optimization of on-site construction parameters and verifies the effectiveness of the present invention.

[0129] The present invention provides a method and device for evaluating the penetration and extension effect of hydraulic fractures in multi-layer thin interlayers, which is particularly suitable for continental shale oil reservoirs. A mathematical model based on elasticity and poroelasticity theory is constructed to accurately simulate the flow of fluids in fractures and the interaction between fracturing fluid and rock. The model can accurately predict the penetration and extension process of fractures under the condition of multi-layer thin interlayers, thereby significantly improving the prediction accuracy. This model not only helps to design and optimize fractures more scientifically, but also has been proven to have good prediction and analysis effects in practical applications in multiple continental shale oil reservoirs.

[0130] In the second aspect, the present application provides a hydraulic fracture penetration effect evaluation device, see Figure 3 , the device comprises:

[0131] A three-dimensional plane hydraulic fracturing model building module is used to build a three-dimensional plane hydraulic fracturing model to simulate the formation and expansion of cracks during hydraulic fracturing;

[0132] A reservoir coupled flow and geomechanical response modeling module is used to simulate the non-uniform spatiotemporal evolution of stress during the injection and production process of fluids in porous media;

[0133] A module for establishing a model of vertical and horizontal stress heterogeneity in formations, which is used to establish a model of vertical and horizontal stress heterogeneity in formations to simulate the influence of vertical and horizontal stress heterogeneity on the hydraulic fracturing expansion process;

[0134] A fracture extension model building module is used to build a fracture extension model based on the three-dimensional hydraulic fracturing model and the reservoir coupled flow and geomechanical response model, and introduce the non-uniform conditions of longitudinal stress and transverse stress in the formation longitudinal and transverse stress non-uniformity model, and according to the formation parameters and stress conditions;

[0135] The crack extension model solving module is used to numerically solve the crack extension model and obtain the crack extension parameters under different stress inhomogeneous conditions.

[0136] In one embodiment, the three-dimensional plane hydraulic fracturing model building module includes:

[0137] An initial three-dimensional stratum model building unit is used to build an initial three-dimensional stratum model;

[0138] An initial crack parameter acquisition unit, used to acquire initial crack parameters, including the initial position, size and opening pressure of the crack;

[0139] An elastic deformation simulation unit is used to simulate the elastic deformation of the initial three-dimensional formation model based on the initial fracture parameters, simulate the behavior of the fracture under elastic deformation, and determine the fracture deformation parameters;

[0140] The fracture extension simulation unit is used to simulate the expansion behavior of the fracture under continuous stress according to the fracture deformation parameters, the physical property parameters of the formation and the fracturing fluid, and obtain the fracture simulation behavior data;

[0141] The comparison and optimization unit is used to compare the actual observation data of the fracture and the fracture simulation behavior data, optimize the fracture deformation parameters and the initial three-dimensional formation model through the actual observation data, and obtain the optimized three-dimensional plane hydraulic fracturing model.

[0142] In one embodiment, the reservoir coupled flow and geomechanical response model building module includes:

[0143] The reservoir model building unit is used to build a reservoir model to reflect the pore structure, porosity, permeability and formation pressure characteristics of the reservoir;

[0144] A simulation fluid parameter acquisition unit, used to acquire simulation fluid parameters, including fluid type, fluid physical properties, fluid injection and output speed and pressure;

[0145] A fluid flow behavior simulation unit, used to simulate the flow behavior of the fluid in the porous medium using a reservoir model according to simulated fluid parameters;

[0146] The geomechanical impact simulation unit is used to simulate the impact of fluid flow on geomechanics based on the flow behavior using a linear elastic constitutive model.

[0147] In one embodiment, the module for establishing the vertical and lateral formation stress heterogeneity model includes:

[0148] Non-uniformity definition unit, used to determine longitudinal and transverse stress non-uniformity, where longitudinal stress non-uniformity refers to the stress variation in the thickness direction of the formation, and transverse stress non-uniformity refers to the stress variation in the horizontal direction of the formation;

[0149] The longitudinal and transverse stress non-uniformity model simulation and establishment unit is used to simulate the impact of stress non-uniformity on hydraulic fracturing, establish the longitudinal and transverse stress non-uniformity model of the formation, and simulate the formation and expansion of cracks under different stress non-uniformity conditions.

[0150] In one embodiment, the crack extension model building module includes:

[0151] Stress non-uniform condition introduction unit, used to introduce stress non-uniform conditions of longitudinal stress and transverse stress;

[0152] The fracture extension model building unit is used to build a numerical model of fracture extension according to the hydraulic fracturing mechanics mechanism, so as to simulate the longitudinal and lateral expansion process of the fracture under the input formation parameters and stress conditions.

[0153] In a third aspect, the present application provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the evaluation method described in any of the above embodiments are implemented.

[0154] In one embodiment, a computer device is provided. The computer device may be a terminal, that is, a device to be upgraded. The internal structure diagram thereof may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, a network interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with the server through a network connection. When the computer program is executed by the processor, a method for evaluating the penetration effect of hydraulic fractures is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0155] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0156] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the evaluation method described in any of the above embodiments are implemented.

[0157] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0158] The evaluation method and device provided in the present application can accurately simulate the penetration and extension process of hydraulic fractures under geological conditions where multiple layers of thin interlayers are developed, significantly improving the prediction accuracy of the penetration and extension effect of fractures, thereby providing a scientific basis for the rational design and optimization of fractures.

[0159] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. It should be noted that "in one embodiment", "for example", "for example", etc. in this application are intended to illustrate the present application, rather than to limit the present application. The above-described embodiments only express several implementation methods of the present application, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the patent application. It should be pointed out that for a person of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can also be made, which all belong to the scope of protection of the present application. Therefore, the scope of protection of the patent in this application shall be subject to the attached claims.

Claims

1. A method for evaluating the penetration effect of hydraulic fractures, characterized in that: The steps include: Establish a three-dimensional planar hydraulic fracturing model to simulate the formation and expansion of cracks during hydraulic fracturing; Establish a reservoir coupled flow and geomechanical response model to simulate the inhomogeneous temporal and spatial evolution of stress during the injection and production process of fluids in porous media; Establish a model of vertical and horizontal stress heterogeneity in the formation to simulate the impact of vertical and horizontal stress heterogeneity on the hydraulic fracturing expansion process; Based on the three-dimensional hydraulic fracturing model and the reservoir coupled flow and geomechanical response model, and by introducing the non-uniform conditions of longitudinal stress and transverse stress in the formation longitudinal and transverse stress non-uniformity model, a fracture propagation model is established according to formation parameters and stress conditions. The crack propagation model is numerically solved to obtain the crack propagation parameters under different stress inhomogeneity conditions.

2. The evaluation method according to claim 1, characterized in that: The expansion parameters include the expansion speed, expansion length, expansion height and expansion direction of the crack.

3. The evaluation method according to claim 1, characterized in that: The step of establishing a three-dimensional plane hydraulic fracturing model includes: Establish an initial three-dimensional stratigraphic model; Obtaining initial crack parameters, including the initial position, size and opening pressure of the crack; Based on the initial fracture parameters, the initial three-dimensional formation model is subjected to elastic deformation simulation, the behavior of the fracture under elastic deformation is simulated, and the fracture deformation parameters are determined; According to the fracture deformation parameters, the physical property parameters of the formation and the fracturing fluid, the expansion behavior of the fracture under continuous stress is simulated to obtain the fracture simulation behavior data; By comparing the actual observation data of the fractures with the simulated fracture behavior data, the fracture deformation parameters and the initial three-dimensional formation model are optimized through the actual observation data to obtain an optimized three-dimensional planar hydraulic fracturing model.

4. The evaluation method according to claim 1, characterized in that: The step of establishing a reservoir coupled flow and geomechanical response model includes: Establish a reservoir model to reflect the pore structure, porosity, permeability, and formation pressure characteristics of the reservoir; Obtain simulation fluid parameters, including fluid type, fluid physical properties, fluid injection and production rate and pressure; According to the simulated fluid parameters, a reservoir model is used to simulate the flow behavior of the fluid in the porous medium; Based on the flow behavior, a linear elastic constitutive model is used to simulate the impact of fluid flow on geomechanics.

5. The evaluation method according to claim 1, characterized in that: The step of establishing the vertical and horizontal stress heterogeneity model of the formation includes: Determine longitudinal and transverse stress non-uniformity, where longitudinal stress non-uniformity refers to stress variations in the thickness of the formation and transverse stress non-uniformity refers to stress variations in the horizontal direction of the formation; Simulate the impact of stress heterogeneity on hydraulic fracturing, establish vertical and horizontal stress heterogeneity models of the formation, and simulate the formation and expansion of cracks under different stress heterogeneity conditions.

6. The evaluation method according to claim 1, characterized in that: After the step of numerically solving the crack extension model to obtain the crack extension parameters under different stress inhomogeneous conditions, the evaluation method further comprises the following steps: The expansion parameters of real hydraulic fracturing cases are obtained, and the fracture expansion model is trained to optimize the model parameters of the fracture expansion model.

7. The evaluation method according to claim 1, characterized in that: The evaluation method is used to evaluate the hydraulic fracture penetration effect of continental shale oil reservoirs.

8. A hydraulic fracture penetration effect evaluation device, characterized in that: The device comprises: A three-dimensional plane hydraulic fracturing model building module is used to build a three-dimensional plane hydraulic fracturing model to simulate the formation and expansion of cracks during hydraulic fracturing; A reservoir coupled flow and geomechanical response modeling module is used to simulate the non-uniform spatiotemporal evolution of stress during the injection and production process of fluids in porous media; A module for establishing a model of vertical and horizontal stress heterogeneity in formations, which is used to establish a model of vertical and horizontal stress heterogeneity in formations to simulate the influence of vertical and horizontal stress heterogeneity on the hydraulic fracturing expansion process; A fracture extension model building module is used to build a fracture extension model based on the three-dimensional hydraulic fracturing model and the reservoir coupled flow and geomechanical response model, and introduce the non-uniform conditions of longitudinal stress and transverse stress in the formation longitudinal and transverse stress non-uniformity model, and according to the formation parameters and stress conditions; The crack extension model solving module is used to numerically solve the crack extension model and obtain the crack extension parameters under different stress inhomogeneous conditions.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the evaluation method described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the evaluation method according to any one of claims 1 to 7 are implemented.

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