126 results about "Percolation" patented technology

The invention provides a digital modeling method for enhancing connectivity of a low-porosity rock core, a medium and equipment, and relates to the field of digital modeling of rock cores, and the method comprises the following steps: reconstructing a Gaussian random field based on SAXS data to obtain an initial model of a three-dimensional digital rock core pore structure; extracting pore center points of the initial model, and constructing an initial network connecting all the pore center points; based on a minimum spanning tree algorithm, identifying mutually isolated pore clusters in the initial network, and selecting a most efficient seepage path skeleton connected with the isolated clusters; based on the seepage path skeleton, constructing a throat with fractal characteristics; and according to the total volume of the throat, performing morphological corrosion operation on an original pore area in the initial model, embedding the constructed throat into the corroded model, and then performing controllable morphological expansion operation until the volume variation of the final model is smaller than a preset error threshold. According to the method, the reconstruction precision of the digital rock core in microstructure and macroscopic connectivity is effectively improved.

The invention relates to the technical field of flood purification treatment, and discloses a flood percolation and purification system based on artificial intelligence. A flood data acquisition unit of the system acquires physical characteristics and chemical components of flood in real time, extracts multi-dimensional water quality indexes, identifies pollution concentration abnormal areas through a neural network, and generates an infiltration medium pollution load distribution diagram; a percolation layer state analysis unit calls high-load area data, recognizes percolation layer blockage and saturation segments in combination with historical percolation efficiency, and generates a percolation efficiency attenuation interval; the purification medium regulation and control unit extracts the purification efficiency and the regeneration state according to the attenuation interval, judges the medium failure condition and generates a purification medium dynamic adjustment strategy; and the purification process execution unit calls the regulation and control parameters, detects the pressure change and the pollutant interception amount, identifies the interlayer synergistic effect strength, and generates a purification medium backwashing instruction to control the start and stop of a purification layer high-pressure backwashing pump after reaching the standard.

The invention relates to the technical field of geotechnical engineering disaster monitoring and early warning, and discloses a stratum rainfall seepage deformation coupling numerical simulation method and system and a storage medium, and the method comprises the steps: building a three-dimensional geologic model reflecting soft and hard rock interbed characteristics; converting the on-site rainfall data into hydraulic boundary conditions in real time; calculating a rock mass shear expansion volume change rate, determining a chemical damage acceleration factor, and updating a total damage variable; reconstructing a permeation tensor representing the dominant flow channel according to the space gradient of the damage variable; solving a fluid-solid coupling equation based on the permeability tensor, obtaining pore water pressure and calculating a displacement field; building a likelihood function by using field monitoring data to perform inversion correction on model parameters; and evaluating the stability based on the corrected calculation result and outputting an early warning signal. By constructing a mechanical coupling mechanism and a dominant flow channel model, precise simulation of a landslide evolution process in a complex geological environment is realized.

The invention discloses a method for judging whether seepage phase change and leakage occur in multi-scale static seal, which comprises the following steps of: 1, acquiring positive pressure sigma under the working condition of a static seal product by utilizing a force sensor or a finite element simulation method; step 2, obtaining height distribution of the contact surface of the static sealing product by using a high-precision microscope, and obtaining characteristic parameters; 3, according to the contact basic equation, solving the relation between the contact area and the positive pressure and the generalized diffusion variance; 4, for a certain specific analysis scale, giving a leakage critical characteristic line L of a corresponding critical contact area ratio; 5, in a characteristic state plane, namely a roughness hRMS-fractal index H plane, according to the relative position of the characteristic parameters and the leakage critical characteristic line L, whether leakage occurs or not is judged; the problem that a traditional sealing performance evaluation method depends on an empirical threshold and cannot quantitatively represent multi-scale contact characteristics and seepage phase change critical conditions is solved.

The invention relates to the technical field of geological sequestration, in particular to a geological sequestration reaction simulation method and device based on a basalt layer, and the method comprises the steps: obtaining a basalt layer sample and geological parameters of a target area; the method comprises the following steps: placing basalt layer samples in a reaction device layer by layer, arranging a plurality of horizontal porous injection pipelines between layers, and loading triaxial stress to simulate underground rock stratum constraint of a target area; based on geological parameters, constructing an axial temperature gradient and a water confining pressure gradient in the reaction device; injecting a target gas fluid into the basalt layer sample by using a horizontal porous injection pipeline according to a preset sealing angle; monitoring the seepage parameters of the target gas fluid and the relevant parameters of the basalt layer sample in real time, and evaluating the carbonization rate at different preset sealing angles. The objective of the invention is to solve the problem of experimental simulation effectiveness under the geological sequestration horizontal injection condition of the basalt layer, realize geological sequestration efficiency evaluation and provide reliable data for improving the geological sequestration efficiency.

The invention provides a dynamic heat-water-force coupling test device and test method, and relates to the technical field of rock performance test.The device comprises a sample chamber for containing a rock sample; the heat loading assembly, the pore water pressure loading assembly and the force loading assembly are integrally arranged; the heat loading assembly comprises a heating element and a cooling element so as to simulate an environment in a wide temperature range or under a freezing and thawing cycle condition; the pore water pressure loading assembly is communicated with the rock sample to establish pore water seepage loading; an axial pressure loading element of the force loading assembly applies dynamic axial pressure to the rock sample, and a confining pressure loading element of the force loading assembly applies dynamic confining pressure to the rock sample; the sealing sleeve wraps the rock sample so as to isolate the confining pressure medium from the liquid medium. According to the device provided by the invention, three dynamic loads including the dynamic temperature, the dynamic pore water pressure and the dynamic mechanical stress can be synchronously applied and accurately controlled in a single device, so that a rock sample is subjected to a mechanical test in a vivid dynamic multi-field coupling environment.

The invention provides a carbon dioxide multi-layer integration injection dynamic regulation and control method and device, and relates to the field of carbon dioxide geological sequestration, and the method comprises the steps: determining the optimal layer number and layer spacing distance of multi-layer integration injection based on obtained geological parameters, and obtaining a plurality of injection layers; according to the geological parameters and the length of the gas injection well, an interlayer allowable pressure difference is calculated in combination with a seepage mechanical formula, and spatial distribution parameters of all injection layers are determined; determining an inlet angle of an injection port corresponding to each injection layer; analyzing the porosity change rate between the injection layers and the coupling influence coefficient of the stress field change; and dynamically adjusting the opening degree of the injection port of each layer by adopting a model predictive control algorithm, and determining a delayed injection strategy according to a configured formation permeability grading standard. According to the method, the injection flow uniformity and the sealing efficiency can be improved, the interlayer fluid channeling risk is reduced, and accurate dynamic regulation and control of multi-layer unified injection are achieved.

The invention relates to the technical field of material permeability experiment devices, in particular to a microscopic seepage model simulation device which comprises a clamping assembly, a box body with an upward opening and an upper gland with a transparent observation window in the middle. The device is reasonable and compact in structure and convenient to use, sandstone particles can be compressed in the simulation bin through the upper gland, and a simulated sandstone layer with the same structure as an oil reservoir stratum sandstone is formed; the seepage liquid can more uniformly enter the vertical micropores in the rectification strip through the left diversion trench, and the horizontal micropores communicated with the vertical micropores can enable the seepage liquid to uniformly flow into the simulation bin from the right side surface of the rectification strip in a layered manner, so that the seepage liquid can flow in parallel in the simulative sandstone layer; therefore, the seepage liquid can simulate one-dimensional linear flow in the simulated sandstone layer, the situation that the seepage liquid has excessive turbulent flow to influence an experiment result is avoided, the flowing state of deep stratum fluid laminar flow can be simulated more truly, and a better experiment result is obtained.

The utility model belongs to the technical field of material extraction, and discloses percolation extraction equipment. The percolation extraction equipment comprises at least two percolation columns, a first pipe group, a second pipe group and a third pipe group, wherein each percolation column is provided with a bottom inlet, a bottom outlet, a top outlet and a top inlet; the bottom inlet is used for circulating a solvent or an extracting solution, the top inlet is used for circulating the solvent, and the bottom outlet and the top outlet are used for circulating the extracting solution; the first pipe group comprises a plurality of first connecting pipes for connecting the at least two percolation columns in series, and two ends of each first connecting pipe are respectively communicated with the top outlet and the bottom inlet; the second pipe group comprises a plurality of second input pipes which are connected in parallel, and the second input pipes and the percolation columns are communicated with the bottom inlet in a one-to-one correspondence manner; the third pipe group comprises a plurality of third input pipes which are connected in parallel; the third input pipes and the percolation columns are communicated with the top inlet in a one-to-one correspondence manner. The percolation extraction equipment can realize various extraction processes, is suitable for different types of materials, reduces the cost input, and has relatively high process flexibility.

The invention belongs to the technical field of constructional engineering, and particularly relates to a basement bottom plate partitioned water filtering channel performance evaluation method. The method comprises the following steps: firstly, based on geological conditions of a target project and basement structure parameters, establishing a three-dimensional seepage geometric model comprising a basement bottom plate and a surrounding soil layer; then, corresponding hydraulic parameters are given to all soil layer materials and water filtering channel materials in the model; then, setting at least two calculation working conditions and carrying out steady-state seepage calculation under different underground water level conditions; and finally, comparing and analyzing the evaluation indexes of different working conditions, evaluating the performance advantages of the partitioned water filtering channel compared with a traditional drainage mode, and carrying out parameter sensitivity analysis and parameter selection. According to the method, the drainage performance of the basement bottom plate can be remarkably improved, the maximum pore water pressure below the bottom plate is reduced, the average seepage speed is increased, the drainage efficiency is improved, and scientific basis and technical support are provided for waterproof drainage design of the basement.

The application discloses a shale oil reservoir core micro-percolation model and a preparation method and application thereof, and belongs to the technical field of oilfield development experiment researches.The core micro-percolation model comprises a rock sample and adhesive glass sheets used on two surfaces of the rock sample, and according to the oil-water flow direction in the rock sample, the side surface of the rock sample is set as an inflow end, an outflow end, a first end and a second end respectively, one or two needle heads are arranged close to the inflow end, one needle head is arranged close to the outflow end, and the core micro-percolation model is packaged through glue.The single-needle head and double-needle head micro-percolation models are prepared for different types of shale oil reservoir cores, and oil-water two-phase percolation experiments are carried out on typical rock samples; through the experiments, more accurate understanding of the percolation channels of oil and water in the shale reservoir core is obtained, the distribution states of residual oil and bound water in the core are accurately characterized in a visualized mode, and important references can be provided for the research on percolation curves, the understanding of percolation rules and the compilation of development schemes.

The present invention relates to the technical field of rock mass engineering, and discloses an analysis method for the crack propagation process of rocks and concrete considering seepage corrosion. The method includes: generating m×n grid points, and assigning specified labels to different grid points to respectively represent soluble substances, insoluble substances, pores, water, etc.; simulating the flow of water in cracks and the diffusion of solutes; by analyzing whether there is liquid in the front, rear, left, and right directions of the solid during the calculation, it can be determined whether the solid particles will exfoliate and migrate; calculating the water flow impact force borne by the movable solid particles based on the Bernoulli equation, and calculating the moving rate of the solid particles based on Newton's second law. The method proposed by the present invention can more efficiently and accurately carry out the crack propagation of brittle materials such as rocks and concrete under the action of seepage, and can provide guidance for the analysis of sudden water inrush during tunnel excavation, the evolution process of seepage water during operation, etc.

This invention discloses a method for extracting the equivalent permeability of multi-stage seepage paths in a pore network, comprising the following steps: S1, binarizing the images captured by the experimental testing equipment, executing the pore numbering module L to obtain pore regions with different numbers; S2, executing the directed graph generation module B to generate a directed connectivity matrix C. B S3. Execute the path search module W, using continuous repeatability as a constraint during path search. S4. Execute the penetration rate equivalence module P to determine the experimental calibration coefficient C. E By confirming the magnitude of seepage resistance and the range of equivalent permeability for each path, this invention can quickly solve key issues such as the applicable range of permeability and multi-layer fluid distribution for fluid transport (such as geologically sealed CO2 and displacement fluids for reservoir development) in heterogeneous geological bodies. It provides important guidance and support for the formulation of schemes such as well location / well network layout, layer combination, and quantification of recovery / storage volume for reservoir development or CO2 geological storage.

The application discloses a method and equipment for predicting production decline of a tight gas horizontal well with a variable decreasing exponent, and a storage medium, and comprises the following steps: collecting historical gas production data of a target well; performing nonlinear regression analysis by taking a dimensionless time function as an independent variable and taking a logarithmic value of the production as a dependent variable, and determining a second key undetermined parameter and a linear expression by a characteristic curve fitting method; substituting the parameter and a theoretical initial production into a formula to obtain a time-varying prediction model of the gas well production; comparing and analyzing measured data in the field to obtain an absolute error value; if the absolute error value is greater than an absolute error threshold value, the next step is performed; repeating the steps based on historical gas production data of a measure section to obtain a time-varying prediction model of the gas well production of the measure section. The application can more accurately represent an actual percolation law of the tight gas reservoir, and the theoretical calculation result is more in line with a dynamic material balance principle of the gas reservoir, thereby providing a new theoretical basis and technical means for optimizing a development scheme of the tight gas horizontal well.

The application discloses a kind of rock gas relative permeability measurement method based on lattice Boltzmann method, comprising the following steps: (1) determining the porosity corresponding to each water saturation grade of rock, using four-parameter growth method to generate the rock porous medium model consistent with the porosity of each water saturation grade rock;(2) using lattice Boltzmann method to carry out gas seepage simulation, the bias pressure of gas boundary is applied to the rock porous medium model, the gas permeability and relative permeability of rock porous medium model under different porosity are calculated;(3) draw the curve of rock gas relative permeability and different water saturation, determine the relative permeability of rock under different water saturation.The application carries out gas seepage simulation by rock porous medium model and lattice Boltzmann method, obtains the permeability of rock porous medium model under different water saturation, and then calculates the relative permeability, constructs the functional relationship between rock sample water saturation and relative permeability, to determine the rock gas relative permeability simply and effectively.

The application discloses a kind of high-pressure conditions under multiple medium digital core gas-water two-phase percolation simulation method, and the gray scale image of fracture-pore type piston rock sample is obtained by CT scanning, the fracture-pore network model of the rock sample is constructed, then the experimental results of gas-water relative permeability under normal temperature and pressure are used to correct the model, carry out permeability stress sensitivity experiment under high temperature and high pressure, obtain the relationship curve of permeability with confining pressure, the fracture opening in the corrected fracture-pore network model is used to simulate the fracture closure under high temperature and high pressure, and the experimental results of permeability under high temperature and high pressure are used to correct, obtain the relationship of fracture opening with confining pressure, further predict the gas-water two-phase relative permeability curve under different pressures, provide theoretical support for efficient development of high-pressure gas reservoir.

The invention relates to the field of environment and geotechnical engineering, in particular to a device and method for jointly testing leakage and expansion stress at the lap joint of geomembrane vertical barriers, and the device comprises a container, a cover plate, a data acquisition and transmission system, a stress sensor and the like. The testing device can be used for testing the influence of different lap joint sealing materials, types of pollution liquids, water pressure and the self-healing capability of the lap joint sealing materials on the leakage amount of the geomembrane composite vertical barrier lap joint structure. Meanwhile, the device can also reveal the internal relation between the leakage amount of the geomembrane composite vertical barrier lap-joint structure and the expansion stress of the lap-joint sealing material, and the leakage amount of the geomembrane composite vertical barrier lap-joint structure can be measured by adjusting the seepage pressure, testing the chemical characteristic parameters (concentration, conductivity and pH value) of pollutants and monitoring the expansion stress and seepage amount of the lap-joint sealing material. The method for predicting the leakage amount of the geomembrane lap joint structure is established, and a scientific basis is provided for a geomembrane composite vertical barrier design scheme.

The invention relates to the technical field of shield tunnel construction, in particular to an underground structure compaction grouting permeation filtration diffusion time-varying analysis system and method.The method comprises the following steps that a grouting pressure and grouting time relation calculation model is built, and construction parameters are obtained; inputting the obtained construction parameters into a constructed grouting pressure and grouting time relation calculation model; the situation that the grouting pressure changes along with the grouting time and considering the deep percolation effect and the slurry viscosity time-varying characteristic at the same time, the situation that the grouting pressure changes along with the grouting time and considering the deep percolation effect independently and the situation that the grouting pressure changes along with the grouting time and considering the viscosity time-varying characteristic independently are obtained through calculation and output. According to the method, the pore blocking effect caused by particle deposition of the slurry in the soil body and the dynamic change of the slurry viscosity along with time are coupled, and the influence of the deep percolation effect and the time-varying property of the slurry viscosity on the permeation and diffusion of the slurry is considered at the same time.

The invention relates to a method for calculating porous medium two-phase flow energy dissipation based on a particle velocity measurement method, and belongs to the technical field of porous medium seepage mechanics experiments. The invention discloses a method for calculating porous medium two-phase flow energy dissipation based on a particle velocity measurement method. The method comprises the following steps: preparing a transparent pore medium microscopic model with a specific microscopic pore structure; carrying out a visual multiphase flow experiment on the pore medium microscopic model; determining external input work based on the inlet and outlet pressure data; accurate calibration of space and phase state is carried out on the original image, and interface energy is obtained through calculation; determining a velocity vector of a non-wetting phase in an experiment based on a particle velocity measurement method, and calculating to obtain kinetic energy; and determining the ratio of energy dissipation to total energy in the multiphase flow system based on external input work, interface energy and kinetic energy. According to the method, the conversion from a visual flow image to a quantitative energy component can be realized, and the viscous dissipation and the interface energy in the displacement process are accurately calculated, so that an energy dissipation mechanism is disclosed, and a key data support is provided for engineering optimization and numerical simulation.

The application discloses a method and device for determining percolation characteristics of a reservoir, and belongs to the technical field of oil and gas reservoir exploration and development. The application divides different reservoir space matching types by the structural characteristics and distribution characteristics of the reservoir space in a core, constructs a corresponding reservoir conceptual model for each reservoir space matching type, establishes a corresponding percolation model for different types of reservoir spaces in the reservoir conceptual model, and obtains the pressure response of the outlet end of different reservoir conceptual models in the process of solving the percolation model, so as to draw a well test characteristic curve, and determine the corresponding relationship between different reservoir space matching types and percolation characteristics according to the well test characteristic curves of different reservoir conceptual models, thereby providing support for the identification and evaluation of multiple medium reservoirs.

The invention provides a water well water injection state evaluation method, which comprises the following steps of: 1, closing a water well in normal water injection, recording wellhead pressure, and drawing a water injection pressure drop curve according to the wellhead pressure change condition of the well; and 2, calculating the FD value of the well according to the water injection pressure drop curve of the well. And 3, measuring and calculating interval values of the FD values under different water injection masses by utilizing a seepage mechanics theoretical formula. And step 4, comparing the calculated FD value with the interval range of the FD value under different water injection qualities so as to evaluate the water injection quality. The water well water injection state evaluation method can accurately evaluate the water injection quality of the water injection well and determine the interval with low-efficiency and ineffective water injection, so that targeted adjustment measures are taken, and the water injection quality and benefits are improved.

The present application relates to the technical field of low-permeability oil and gas reservoir development, and is a visual flow experiment device and experiment method for simulating conventional rod pumping dynamic, comprising a constant-pressure water supply device, a micro displacement device, a measuring cylinder and a vacuum suction device, the constant-pressure water supply device outlet is communicated with the measuring cylinder bottom inlet through a first water supply pipeline, the vacuum suction device top inlet is fixedly communicated with a vacuum hose, the vacuum hose inlet end extends into the measuring cylinder, and the influence of the change amplitude of the bottom hole pressure on the percolation is controlled by simulating different pumping unit stroke and frequency conditions.The present application has simple structure, convenient operation, easy measurement and calculation of various pressures, and the experiment phenomenon is easy to observe, record and analyze, the conventional rod pumping system can be simulated, the dynamic change of different drainage systems and the influence of the bottom hole pressure disturbance on the reservoir percolation are studied, the best production system parameters under different reservoir conditions are optimized, thereby reducing the production cost and improving the reservoir recovery.

The present invention discloses a device and method for monitoring rock degradation over time under stress-temperature-seepage coupling. The device includes a three-dimensional stress loading component, a temperature control component, and a seepage control component. The three-dimensional stress loading component is used to apply axial stress and confining pressure, the temperature control component is used to adjust the heating temperature, and the seepage control component is used to apply seepage pressure. The method includes the following steps: obtaining a correction coefficient; assembling a monitoring device and testing the original porosity and original density of the rock sample; subjecting the rock sample to three-dimensional stress, temperature, and seepage coupling, and calculating the porosity and density of the rock sample at different times using the corrected formula, and finally obtaining the relationship between the porosity, density, and degradation degree of the rock sample over time under three-dimensional stress-temperature-seepage coupling. The present invention simultaneously takes into account the coupling effects of stress, temperature, and seepage fields, and comprehensively reflects the degradation process of rock over time in a complex environment.

The invention relates to the technical field of oil drilling, in particular to a pressure relief type formation pressure calculation method based on a fluid-solid coupling theory. Comprising the following steps: step 1, determining a target area, exporting a geological model of the target area from geological modeling software petrol, and importing the geological model into fluid-structure interaction software ABAQUS; 2, the Young modulus E and the Poisson's ratio v of the stratum are calculated, and ABAQUS is input; 3, the porosity phi and the permeability k of the stratum are calculated, and ABAQUS is input; 4, by taking the formation pressure and ground stress data of the n drilled wells as constraint conditions, performing interpolation by adopting a trend line method to obtain mechanical and seepage parameters of inter-well formation rocks; 5, by taking the formation pressure as a constraint condition, calculating through a fluid-solid coupling equation to obtain a pore pressure field, a deformation field and a stress field of the target area under the fluid-solid coupling condition; 6, the simulation results of the n-m wells are compared with actual measurement data, and the accuracy of the results is verified through goodness of fit; and 7, predicting the formation pressure profile of the to-be-drilled well.

The invention discloses an analogue simulation device and method for metallogenic fluid of mountain-building type gold ore. Comprising a fluid source module capable of simulating a mountain-building type metallogenic fluid source, a temperature and pressure simulation system capable of performing temperature and pressure control on fluid generated by the fluid source module to simulate a metallogenic environment, and a rock medium simulation module capable of simulating a seepage path of the fluid in rock cracks or pores; the relative position of the rock sample module and the liquid outlet of the fluid source module can be changed through the adjusting structure, so that during each experiment, the fluid seepage path can be flexibly adjusted and is not limited to fixed-point contact with porous media such as an internal fault and surrounding rock from a fixed inlet, more diversified fluid flow directions can be simulated, and the experiment efficiency is improved. Compared with a traditional ore-forming fluid simulation device with a fixed liquid inlet, the device can more comprehensively reflect the real migration condition of the ore-forming fluid of the mountain-building type gold ore in a complex geological environment, and is beneficial to deeply exploring the ore-forming law.

The invention relates to the technical field of caving zone adjacent-position gangue grouting, and discloses a caving zone adjacent-position gangue grouting filling amount prediction method which specifically comprises the following steps that 1, gangue slurry with the concentration of 70% is injected into a gap between a fractured rock mass and a basic roof through a grouting pipe end hole, slurry seepage in adjacent grouting is divided into early-stage low-pressure diffusion and later-stage pressure seepage, and gangue slurry shows remarkable non-Newtonian fluid mechanical properties in the flowing process. According to the method, based on the seepage mechanics theory, the influence of the slurry property and the percolation effect is considered, the caving zone adjacent position grouting seepage model is constructed, the grouting diffusion range, the grouting seepage slope angle and the grouting filling amount can be accurately calculated, and coordinated development of coal development and environmental protection is better facilitated. Meanwhile, in combination with caving zone adjacent position grouting three-dimensional numerical simulation analysis, the slurry seepage three-dimensional unsteady state diffusion process is described, the caving zone adjacent position grouting diffusion rule is revealed, and the prediction precision is improved.

The present invention discloses a method for simulating the Darcy seepage experiment of a core and calibrating the permeability parameter, which comprises the following steps: S1, generating particles by using the PFC software and assembling the particles to simulate the rock sample; S2, setting the opening degree of the fluid domain channel, generating a fluid domain network in the pore throats of the rock sample by using the PFC fluid-solid coupling algorithm, and setting the injection and outflow conditions of the fluid at the inlet and outlet ends of the rock sample by using the fluid domain network; S3, monitoring the flow rates at the inlet and outlet ends of the rock sample based on the numerical simulation process of simulating the fluid displacement through the core, and simultaneously measuring the magnitude of the rock permeability; when the flow rates at the inlet and outlet ends of the rock sample are stable, the permeability of the rock sample is measured and calculated at this time; S4, if the permeability does not meet the requirements of subsequent numerical simulations, then the opening degree of the fluid domain channel is modified again, and S2-S3 are repeated until the permeability of the rock sample measured and calculated meets the requirements of subsequent numerical simulations, and the calibration work is completed.

The invention discloses a natural gas well productivity prediction and well test analysis method and system, and belongs to the technical field of natural gas related basic theory research. The method is based on related theories of mathematical physical equations and combines seepage characteristics of real gas in a porous medium in a natural gas well; according to the method, a natural gas nonlinear unstable seepage partial differential equation is established, a dimensionless transformation function of pressure, time and position defined based on a differential quotient is introduced, an analytical solution of the nonlinear seepage equation considering the turbulence effect is obtained, the productivity of a natural gas well is predicted, well testing data is analyzed, and well testing model calculation shows that the yield of the natural gas well is greatly improved. After the inertia-turbulence effect is considered, the bottom hole pressure is lower; the calculation of a fixed bottom hole flowing pressure model shows that the gas well yield is reduced after the inertia-turbulence effect is considered; compared with an existing method, the result has the advantages that errors are reduced, the precision is higher, and a certain theoretical basis can be provided for further researching the problem of unstable seepage of the complex heterogeneous oil and gas reservoir.

The invention belongs to the field of preparation of hard rock transparent similar materials, and particularly relates to a hard rock transparent similar material with specific porosity and a preparation method. The method comprises the following steps: calculating the mass of each component according to the volume and porosity of the required hard rock transparent similar material and the density of the components; pretreating solid particles; cleaning fused quartz sand, preparing a cementing agent, mixing, performing injection molding and curing, and removing a pore-forming agent to obtain the hard rock transparent similar material with specific porosity. The obtained hard rock transparent similar material overcomes the defect that a material prepared in the prior art does not have permeability, and reliable experimental support is provided for revealing a rock mass permeability mechanism and optimizing an engineering seepage control strategy. Meanwhile, the preparation method is easy and convenient to operate, materials are easy to obtain, the preparation period is shortened, and the research efficiency is improved.

The application discloses a method and device for determining CO2 breakthrough pressure of mudstone cap rock, equipment and medium. The method comprises the following steps: scanning and reconstructing the mudstone sample according to the peak pore diameter of the macropore and / or micropore of the clay in the mudstone sample, determining the main control seepage channel of the mudstone sample and the reconstructed pore structure corresponding to the main control seepage channel; extracting the three-dimensional pore network and the basic geometric information of the pore throat according to the reconstructed pore structure for the macropore or micropore determined as the main control seepage channel; and determining the CO2 breakthrough pressure of the mudstone cap rock by two-phase quasi-static displacement simulation according to the three-dimensional pore network and the basic geometric information of the pore throat. The technical scheme can quickly and effectively determine the CO2 breakthrough pressure of the mudstone cap rock.