CN-121580867-B - Multi-scale heat-flow-solid coupling simulation method and system for deep energy reservoir

CN121580867BCN 121580867 BCN121580867 BCN 121580867BCN-121580867-B

Abstract

The invention provides a multi-scale heat-flow-solid coupling simulation method and system for a deep energy reservoir, and belongs to the field of deep energy reservoir numerical simulation. The method comprises the steps of obtaining spatial distribution characteristics and physical parameters of different lithology reservoir mediums under micro-scale, constructing a digital structure model of the reservoir mediums, obtaining a micro-scale numerical model by embedding micro-scale action mechanisms and flow mechanisms in the model, establishing a mapping relation by solving model structure parameters and physical parameters of the micro-scale numerical model under different heat-flow-solid coupling conditions, establishing a macro-scale heat-flow-solid multi-field coupling control equation based on the mapping relation and combining macroscopic geology and engineering data of a target reservoir, solving, and outputting multi-physical-field response of the target reservoir under given working conditions. The invention realizes the fine simulation of dynamic transfer of physical parameters from micro-scale to macro-scale and the multi-field coupling evolution process, and remarkably improves the accuracy and reliability of deep complex reservoir engineering behavior prediction.

Inventors

XIONG QINGRONG
LI NAN
WANG LIGE
WANG FENGLONG
ZHANG QIANGYONG
DUAN KANG

Assignees

山东大学

Dates

Publication Date: 20260508
Application Date: 20260126

Claims (9)

1. A deep energy reservoir multi-scale thermo-fluid-solid coupling simulation method, comprising: Acquiring spatial distribution characteristics and physical parameters of different structural components of different lithology reservoir mediums under a microscale, and constructing a digital structure model of the reservoir mediums; obtaining a microscopic numerical model of the reservoir medium by embedding a microscopic action mechanism and a flow mechanism in the constructed digital structure model, and establishing a mapping relation between environmental conditions, structural parameters and physical parameters of the reservoir medium by solving model structural parameters and physical parameters of the microscopic numerical model under different heat-flow-solid coupling conditions; Based on the mapping relation, combining macroscopic geology of a target reservoir with engineering data, establishing a macroscopic scale heat-flow-solid multi-field coupling control equation, solving the control equation, outputting multi-physical-field response of the target reservoir under a given working condition, specifically, establishing a macroscopic scale geometric model according to geological data and engineering data of the target deep energy reservoir, importing the mapping relation into the macroscopic scale geometric model, establishing the macroscopic scale heat-flow-solid multi-field coupling control equation, respectively setting initial conditions and boundary conditions of a temperature field, a seepage field and a stress field according to the macroscopic scale heat-flow-solid multi-field coupling control equation, performing multi-physical-field coupling setting, establishing a macroscopic scale heat-flow-solid multi-field coupling numerical model, performing discrete and Newton iterative solving on the macroscopic scale heat-flow-solid multi-field coupling numerical model by adopting a finite element method, and outputting the temperature field, the seepage field and the stress field of the macroscopic scale reservoir under the given working condition.
2. The multi-scale heat-flow-solid coupling simulation method of the deep energy reservoir according to claim 1, wherein the spatial distribution characteristics are used for describing spatial position relation, geometric form and connectivity characteristics of different mineral components and pore crack structures under micro-scale to represent micro-heterogeneous structural characteristics of the deep reservoir medium; The physical parameters are used for representing thermal and mechanical physical properties of the corresponding mineral components, including heat conductivity coefficient, specific heat capacity, elastic modulus and poisson ratio.
3. The deep energy reservoir multi-scale heat-flow-solid coupling simulation method according to claim 1, wherein the digital structure model is a three-dimensional model obtained by reconstructing a microstructure characterization result by adopting a method combining structure mapping and a monte carlo method.
4. The deep energy reservoir multi-scale heat-flow-solid coupling simulation method according to claim 1, wherein the micro-scale numerical model is a pore network model, and comprises a pore network formed by pore nodes and pore throats, and a fracture network formed by connection nodes and fracture units and communicated with the pore network through coupling nodes; The micro-observation action mechanism comprises a heat flow coupling mechanism, a fluid-solid coupling mechanism and a thermosetting coupling mechanism, wherein the coupling process is bidirectional coupling and is dynamically updated along with the change of temperature, pressure or stress state, the flow mechanism comprises one or more of a diffusion flow, a slip flow, a knudsen flow and a surface diffusion mechanism, and the corresponding flow mechanism is adaptively selected according to the pore scale characteristics and the fluid properties.
5. The method for simulating multi-scale heat-flow-solid coupling of deep energy reservoir according to claim 1, wherein the mapping relation between the environmental condition of reservoir medium and the structural and physical parameters is established by convolutional neural network and antagonistic neural network; the input parameters of the mapping relation comprise temperature, confining pressure and injection and production pressure, and the output equivalent parameters comprise porosity, heat conductivity coefficient, specific heat capacity, permeability, elastic modulus and poisson ratio.
6. The deep energy reservoir multi-scale heat-flow-solid coupling simulation method of claim 1, wherein the discrete and newton iterative solution is performed on the macro-scale heat-flow-solid multi-field coupling numerical model by adopting a finite element method, and the method comprises the following steps: dividing the macro-scale geometric model into finite element grids, and refining the grids by a self-adaptive grid to ensure that the model can consider both calculation efficiency and simulation precision; step calculation is carried out on the temperature field, the seepage field and the stress field by adopting an implicit time integration method so as to ensure the numerical stability and adapt to the time scale difference of different physical fields; in each time step, carrying out full coupling solution on the temperature field, the seepage field and the stress field by utilizing a Newton iteration method, and iterating until the residual error of each physical field is lower than a preset threshold value, so as to meet a preset convergence condition; After iteration convergence, calculating equivalent physical property parameters and multi-field coupling response of each macroscopic model unit, using the equivalent physical property parameters and multi-field coupling response to update boundary conditions and model parameters of the next time step, and finally outputting a multi-physical field simulation result of the target deep reservoir under a given working condition.
7. A simulation system employing the deep energy reservoir multi-scale thermo-fluid-solid coupling simulation method of any one of claims 1-6, comprising: the micro-scale parameter acquisition and geometric modeling module is used for acquiring the spatial distribution characteristics and corresponding physical parameters of different structural components under the micro-scale of different lithology reservoir mediums and constructing a digital structure model of the reservoir mediums; The system comprises a microscale modeling and trans-scale mapping module, a microscale thermal-flow-solid multi-field coupling control equation, a mapping relation between environmental conditions, structural parameters and physical parameters, wherein the microscale modeling and trans-scale mapping module is used for constructing a reservoir medium microscale numerical model embedded with various microscale action mechanisms; the macro-scale parameter acquisition and geometric modeling module is used for establishing a macro-scale geometric model according to geological data and engineering data of the target deep reservoir; The multi-physical field coupling model construction module is used for importing the obtained reservoir medium physical property parameter libraries under different environmental conditions into the macro-scale geometric model to establish a macro-scale heat-flow-solid multi-field coupling control equation; the initial boundary condition and multi-physical field coupling setting module is used for setting initial conditions and boundary conditions for a temperature field, a seepage field and a stress field in the macro-scale thermal-fluid-solid multi-field coupling model respectively, completing multi-physical field coupling configuration and establishing a macro-scale thermal-fluid-solid multi-field coupling numerical model; And the numerical solution and result output module is used for carrying out discrete Newton iterative solution on the macro-scale heat-flow-solid multi-field coupling numerical model by adopting a finite element method and outputting a multi-physical-field simulation result of the target deep reservoir under the given working condition.
8. A computer readable storage medium having stored thereon a program, which when executed by a processor performs the steps of a deep energy reservoir multiscale thermo-fluid-solid coupling simulation method according to any of claims 1 to 6.
9. An electronic device comprising a memory, a processor and a program stored on the memory and executable on the processor, wherein the processor performs the steps of a deep energy reservoir multiscale thermo-fluid-solid coupling simulation method according to any one of claims 1 to 6.

Description

Multi-scale heat-flow-solid coupling simulation method and system for deep energy reservoir Technical Field The invention belongs to the technical field of deep energy reservoir numerical simulation, and particularly relates to a deep energy reservoir multi-scale heat-flow-solid coupling simulation method and system. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. Deep energy reservoirs (including deep geothermal reservoirs, deep oil and gas reservoirs, deep underground gas reservoirs and the like) are usually subjected to high-temperature, high-pressure and high-ground stress complex geological environments, and the internal medium structure of the deep energy reservoirs has strong heterogeneity and presents obvious multi-scale characteristics. In the development and utilization process of deep energy reservoirs, a temperature field, a seepage field and a stress field are mutually coupled and dynamically evolved, and the complex interaction of the multi-scale multi-physical field deeply influences the migration of fluid, the deformation of the reservoirs and the transfer and extraction of heat energy, so that great challenges are brought to the optimization of development schemes, the improvement of engineering efficiency and the prevention and control of safety risks. Therefore, the establishment of a numerical model capable of accurately describing the multi-scale heat-flow-solid coupling evolution rule of the deep reservoir is an indispensable key technical foundation for efficient development and utilization of deep energy. Currently, numerical simulation methods for such complex problems still have significant shortcomings. Firstly, in the model construction concept, most macro-scale models describe a reservoir by adopting homogenization or equivalent average parameters based on continuous medium assumption, and the simplification treatment can not reflect the real spatial distribution of mineral composition, pore-throat structure and fracture network under micro-scale and the control effect of the real spatial distribution on macro-thermal, mechanical and seepage properties, so that the reliability and the accuracy of the model face fundamental questions when predicting the reservoir behaviors under deep extreme working conditions. Secondly, in the aspect of cross-scale association, the existing upscaling method often assumes that the micro-feature size is far smaller than the macro-scale, so that the physical process between different scales is manually split, the micro-scale information is excessively simplified or even lost in the transmission process, and the effective transmission of a physical mechanism from bottom to top is difficult to realize. Finally, in particular, the comprehensive consideration of the multi-physical field coupling mechanism is lacking, and the research or focusing on the characterization of a multi-scale structure is carried out to weaken the full field coupling, or only the effect of few fields such as fluid-solid coupling is concerned, and the systematic integration of key influences on a temperature field in a high-temperature and high-pressure environment is generally lacking. Disclosure of Invention In order to overcome the defects of the prior art, the invention provides the multi-scale heat-flow-solid coupling simulation method and system for the deep energy reservoir, which comprehensively consider the multi-scale structural characteristics, strong heterogeneity and multi-physical field coupling effect of the deep energy reservoir and realize the effective transfer of microscopic information to macroscopic simulation, thereby being capable of finely describing the coupling evolution process of a temperature field, a seepage field and a stress field in the deep energy reservoir and providing reliable technical support for the development and utilization of the deep energy reservoir. To achieve the above object, one or more embodiments of the present invention provide the following technical solutions: the invention provides a multi-scale heat-flow-solid coupling simulation method for a deep energy reservoir; A deep energy reservoir multi-scale thermo-fluid-solid coupling simulation method, comprising: Acquiring spatial distribution characteristics and physical parameters of different structural components of different lithology reservoir mediums under a microscale, and constructing a digital structure model of the reservoir mediums; obtaining a microscopic numerical model of the reservoir medium by embedding a microscopic action mechanism and a flow mechanism in the constructed digital structure model, and establishing a mapping relation between environmental conditions, structural parameters and physical parameters of the reservoir medium by solving model structural parameters and physical parameters of the microscopic numerical model under different he