54 results about "Fracture process" patented technology

A method for controlling a fracture height in unconventional oil and gas reservoirs under multi-bedding interference is provided. The method includes: obtaining geological parameters of a target horizontal well, and determining a fracturing fluid and construction parameters based on a production capacity target of the target horizontal well; determining a hydraulic fracturing process of the target horizontal well based on a hydraulic fracturing model for processing the multi-bedding interference, and evaluating the fracture height; comparing the fracture height with an expected control height, if the fracture height is greater than the expected control height, reducing a displacement of the fracturing fluid or a total time of a hydraulic fracturing to update the construction parameters until the fracture height is less than the expected control height; and performing the hydraulic fracturing on the target horizontal well based on updated construction parameters.

The invention relates to the technical field of rock mass mechanical analysis, and discloses a shale bedding mechanical property inversion method, equipment and a medium. The method comprises the following steps: acquiring a mechanical signal and a generated electric signal when a target shale is fractured under external applied force; dividing the shale fracture process into a plurality of time intervals according to a plurality of characteristic events in the electric signals and a bedding geometric model of the shale, and enabling each time interval to correspond to an expansion stage of a shale crack in one bedding interval; according to the equivalent path length of the crack in each bedding interval and the time difference between the adjacent characteristic events, determining the expansion speed of the crack in each bedding interval; according to the mechanical signals and a bedding geometric model, determining the stress intensity of each bedding interval of the shale in the fracture process; according to the stress intensity and the expansion speed, the equivalent fracture energy and fracture toughness of each bedding section of the shale in the fracture process are determined through the energy balance relation of the bedding sections in the fracture process, and therefore the shale bedding mechanical properties are inverted.

The application discloses a kind of coal rock nonlinear fracture propagation length quantitative determination method based on multiple parameters, comprising: preparation of coal rock sample containing notch;Spray black and white speckle on the surface of sample, install acoustic emission sensor, clip type extensometer and displacement sensor;Carry out three-point bending peak after cycle loading and unloading fracture experiment, record load, crack opening, force point displacement, acoustic emission waveform and DIC image;Through COD-P and LPD-P curve calculation mechanics flexibility, back calculation to solve stress constraint crack length;From acoustic emission positioning, obtain the spatial distribution histogram of breakage dissipation energy, combined with DIC horizontal displacement gradient threshold cloud picture, determine equivalent crack tip and length;Further calculate coal rock fracture process zone length, and intuitively show nonlinear fracture propagation path.The application provides a kind of crack dynamic change quantitative determination method based on mechanics flexibility-displacement gradient-energy dissipation distribution multiple physical parameters, reduce the influence of human subjective consciousness, and the measurement result is accurate and reliable.

The invention provides a natural fracture acid fracturing process parameter optimization method and device, equipment and a medium, and the optimization method comprises the steps: obtaining geological and engineering data of a target block, carrying out the fitting of the geological and engineering data to obtain a natural fracture fitting model, determining the natural fracture fitting parameters according to the natural fracture fitting model, and carrying out the acid fracturing process parameter optimization of the target block. Further establishing a pressure drop characteristic parameter model and a natural fracture characteristic parameter model by using actually measured pressure data, and further establishing a productivity prediction model; and according to the productivity prediction model and the natural fracture fitting model, optimizing the acid fracturing process parameters of the natural fractures. According to the method, the condition of natural fractures encountered by underground hydraulic fractures is innovatively and dynamically judged according to the wellhead pressure change rule in the multi-stage alternate acid fracturing process, parameters can be dynamically adjusted on this basis to achieve dynamic optimization of a pump injection program, and a basis is provided for whether the natural fractures are transformed or not in real time in the construction process; and a new thought and a new method are provided for acid fracturing parameter design and optimization.

The application provides a compact dolomite reservoir composite acid fracturing process parameter evaluation system and method, which comprises a simulated fracture device, an acid injection device and a circulating water injection device. The acid injection device comprises an acid storage container, an acid injection pipeline and an acid discharge pipeline. The acid injection pipeline is connected to the acid storage container and the acid injection liquid inlet hole of the simulated fracture device at both ends. The acid discharge pipeline is connected to the acid injection liquid outlet hole of the simulated fracture device. The circulating water injection device comprises a water storage container, a water inlet pipeline and a circulating water discharge pipeline. The water inlet pipeline is connected to the water storage container and the water injection liquid inlet hole of the simulated fracture device at both ends. The circulating water discharge pipeline is connected to the water injection liquid outlet hole of the simulated fracture device and the water storage container at both ends. The application adopts reverse thinking to evaluate the composite acid fracturing process parameters such as the preflush / acid viscosity ratio, the pump injection displacement and the alternating series by taking the fractal dimension, the acid volume, the flow conductivity and the acid fluid loss as the targets, and is more specific and systematic.

This invention belongs to the field of fracture characterization and reservoir hydraulic fracturing simulation technology. It discloses a method and related equipment for characterizing natural fractures and simulating reservoir damage evolution using a phase-field model. By distinguishing primary and secondary natural fractures based on a discrete fracture network and constructing a model, it achieves accurate characterization of the different sizes and spatial heterogeneity of primary / secondary natural fractures in the model. Natural fractures are characterized as mechanically weak surfaces with differentiated parameters. Hydraulic fractures can capture and interact with natural fractures. Combining a phase-field damage model and a rock mechanics constitutive model, it can accurately simulate key behaviors such as activation and deflection during natural fracture propagation without pre-setting fracture paths, avoiding numerical instability and low computational efficiency. Through dynamic coupling analysis of the entire fluid-solid-damage process, it takes into account the influence of multiple factors such as geostress and fluid pressure, improving the accuracy of phase-field simulation, reducing simulation distortion, providing reliable support for fracturing design optimization, helping to improve reservoir stimulation effects and production benefits, and ensuring the smooth implementation of fracturing processes.

This invention relates to the field of connecting rod processing technology, specifically to a fracture device and method for connecting rods in large machinery. The device includes a laser marking machine worktable, a fracture device worktable, and a connecting rod. A laser marking machine and a laser marking feeder are mounted on the upper end of the laser marking machine worktable. A fracture device is mounted on the upper end of the fracture device worktable. The laser marking feeder and the fracture device are used for positioning the connecting rod. The laser marking feeder includes a small-end positioning pin and a large-end positioning pin. The small-end positioning pin is used for positioning the small end of the connecting rod, and the large-end positioning pin is used for positioning the large end of the connecting rod. The fracture device includes a small-end positioning component and a fracture block. The small-end positioning component is used for positioning the small end of the connecting rod, and the fracture block is used for limiting the fracture of the large end of the connecting rod. Compared to existing sawing processes for connecting rods in large machinery, the laser marking fracture process of this invention simplifies the processing flow and improves the performance of the connecting rod.

The application provides a kind of transmission wire ice ridge radial fracture strength testing device and method, it is related to transmission line icing test technical field.The application is through integration ice ridge growth module, ice ridge clamping mechanism and thrust exertion and detection system, constitutes a closed technical scheme for ice ridge test.The application first drops water to transmission wire under low temperature environment, to simulate the natural growth forming process of ice ridge, so that the test is closer to real working condition;Ice ridge clamping mechanism clamps ice ridge by jaw assembly;Thrust exertion and detection system exerts controllable thrust to jaw assembly and records the thrust value of ice ridge in real time, ensures the accurate collection of thrust data, realizes the quantitative evaluation of mechanical properties in the fracture process of ice ridge.

The application discloses a hydrogen-induced cracking molecular dynamics-cohesion cross-scale simulation method, comprising the following steps: constructing a geometric model reflecting the actual microstructure of a material based on the multi-scale structure characteristics such as grain size and grain boundary angle obtained through metallographic observation and electron backscatter diffraction experiments; simulating the fracture process of a micro-interface under different hydrogen concentrations through a molecular dynamics method, obtaining traction-separation data, and calibrating the core parameters of a cohesion model; embedding the above parameters into a polycrystalline finite element model constructed based on a tessellation polygon, realizing parameter transmission and coupled calculation from a micro-scale to a meso-scale; and accurately describing hydrogen-induced grain boundary damage and crack propagation behavior through a cohesion element. The method significantly improves the reliability and prediction accuracy of the model through multi-scale correlation modeling and direct parameter calibration, and provides a theoretical basis and an engineering applicable tool for hydrogen-induced cracking resistance design and life assessment of equipment materials.

The invention provides a solid fracture calculation method and device based on smoothed particle dynamics. The method comprises the following steps: establishing a smoothed particle dynamics calculation model, setting conditions, and obtaining a stress state between particles; and when the stress state between any particle pair meets the judgment basis, judging that the particle pair is broken and breaking the link bond. And calculating the midpoint position of the fracture particle pair and setting the midpoint position as a base point, and establishing a failure surface by taking the connecting line direction of the two fracture particles as a normal direction. And on the basis of a preset smooth kernel function, in the fracture particle influence domain, according to the position relationship between the particles and the fracture surfaces, dividing the particles in the domain into a fracture surface same-side set and a fracture surface different-side set, keeping same-side links, and disconnecting different-side links. And repeating the steps until the calculation of the fracture process of the solid structure is completed. According to the method, stable construction of the failure surface is realized, the influence of real-time position disturbance is avoided, and the simulation precision and the applicability of the algorithm are improved by controlling the link keys in the complete influence domain in a regional manner.

The application provides a water injection well pressure analysis method considering the influence of fracture induced by pressure drive water injection, which comprises the following steps: step 1, establishing a water injection well pressure analysis model considering the influence of fracture induced by pressure drive water injection; step 2, solving the water injection well pressure analysis model considering the influence of fracture induced by pressure drive water injection; step 3, obtaining a water injection well double logarithmic pressure analysis curve through analysis, and judging different flow stages of the reservoir in the fracturing process according to the curve; and step 4, analyzing the bottom hole pressure response characteristics of the pressure drive water injection well, and applying the characteristics to an actual well to verify the accuracy of the established model. The water injection well pressure analysis method considering the influence of fracture induced by pressure drive water injection establishes a water injection well pressure analysis model considering the dynamic expansion of the fracture, has certain technical difficulty, and can determine the flow stage of fluid in the reservoir at different production moments.

The application discloses a kind of (C 20 H 20 P)2MnBr4 In material stress visualization and fracture prediction application, belongs to stress visualization and fracture prediction technical field.It includes the following steps: (1) preparation sensing workpiece: liquid (C 20 H 20 P)2MnBr4 Plastic into the three-dimensional entity consistent with target workpiece geometry;(2) load and collect light signal: under the condition of preset load, load is applied to the sensing workpiece, and the dynamic light image sequence generated under the action of load is synchronously collected;(3) analysis light signal and mapping mechanics behavior.The application realizes the direct physical visualization of stress and fracture process: the application is converted into intuitive, global, real-time optical image by (C 20 H 20 P)2MnBr4 Emission characteristics, abstract simulation calculation cloud picture and discrete measurement data.Stress concentration, crack initiation and expansion and other key mechanical behavior "at a glance", greatly reduce the analysis threshold and interpretation difficulty.

The embodiment of the invention provides a surrounding rock reinforcement control method, and relates to the field of coal mining. In some embodiments of the invention, to-be-reinforced surrounding rock is measured to establish a surrounding rock internal and external structure space information probability model corresponding to the to-be-reinforced surrounding rock; 3D printing is conducted based on the surrounding rock internal and external structure space information probability model, and an equal-proportion-reduced 3D printing model corresponding to the to-be-reinforced surrounding rock is obtained; a monitoring terminal early warning system is used for monitoring stress paths corresponding to the surrounding rock to be reinforced and staged stress in the staged deformation fracture process under each stress path; a CT loading grouting device is used for conducting a loading grouting simulation experiment on the 3D printing model, and the grouting position, the grouting time and the grouting pressure needed for reinforcing the to-be-reinforced surrounding rock are determined; according to the grouting position, the grouting opportunity and the grouting pressure, the surrounding rock to be reinforced is reinforced; and the surrounding rock reinforcement process is observed in real time, grouting pressure is dynamically adjusted, and surrounding rock stabilization is finally achieved.

The application discloses a reinforced concrete structure damage process simulation method based on an SPH method, belongs to the technical field of computational mechanics and structure engineering simulation, and comprises the following steps: firstly, removing the damage softening component from the total deformation gradient to obtain an effective physical state and a deformation gradient without interference; secondly, determining a plurality of mechanism criteria of tensile cracking, shear slip and compression plasticity exhaustion, and obtaining a comprehensive damage index through maximum value enveloping; mapping the damage index into a softening factor through a nonlinear square term, correcting the deformation gradient and dynamically adjusting the particle action strength; finally, performing stress gradual attenuation on critical damage particles, and removing the particles after meeting the step number condition. The application can consider the calculation efficiency and the macroscopic mechanical property under a single constitutive framework, accurately restores the material damage softening and the fracture process, effectively avoids numerical oscillation, and improves the precision and stability of the structure damage simulation.

The invention provides a deep rock dynamic energy consumption analysis and implementation method based on improved near-field dynamics, relates to the field of geotechnical engineering, and overcomes the defects of a traditional bond-based near-field dynamics model in the aspect of describing complex mechanical behaviors of rock materials by introducing a nonlinear damage softening law, a Weibull distribution function and an S-type rate correlation effect criterion. The accuracy and the reliability of the model in the process of simulating the dynamic fracture of the deep underground engineering material are obviously improved; through systematic numerical value verification, the model can be suitable for both two-dimensional and three-dimensional conditions, can accurately simulate material mechanical response and energy evolution rules under different confining pressure conditions, and proves the effectiveness and practicability of the model in solving actual deep underground engineering problems; according to the method, a Hopkinson impact test model is combined with an improved near-field dynamic model, and a complete closed-loop analysis framework of energy input-internal dissipation-energy output is constructed.

The invention discloses a visual experimental device for simulating deep reservoir rock fracture and an experimental method thereof, and relates to the technical field of oil and gas development rock fracture mechanics. Comprising loading frames and pressing plates, rock samples are placed in the loading frames, through holes are formed in the rock samples, the pressing plates are detachably connected with the loading frames, heating pieces are fixed in an outer shell, the four loading plates make contact with one side face of the rock samples respectively, the four loading plates make sliding contact with the interiors of the loading frames, and the loading frames are fixed to the outer shell. One loading plate abuts against one end of the transverse loading assembly, the other loading plate abuts against one end of the longitudinal loading assembly, the transverse loading assembly is perpendicular to the longitudinal loading assembly, the other two loading plates abut against the connecting rods respectively, and the collecting camera is arranged on one side of the fixing frame and electrically connected with a computer collecting system. According to the visual experimental device for simulating the rock fracture of the deep reservoir, the fracture process of the rock in the deep reservoir can be simulated and known more conveniently.

The application discloses a complex high dam concrete structure fracture analysis and calculation method based on near-field dynamics. The method firstly establishes a geometric model of the concrete structure, and constructs control equations of a macroscopic response region and a potential fracture region of the whole structure based on finite element theory (FEM) and near-field dynamics theory (PD); the finite element region and the near-field dynamics region are discretely interpolated by using an implicit format and a shape function, and a unified FEM-PD coupling system control equation is assembled by means of a coordination stiffness matrix and a coupling interface processing technology; the node and material point displacements are calculated by solving linear equations, and the material damage state is updated in real time according to a concrete damage constitutive relation and a critical fracture criterion; and the multiple crack propagation paths are automatically tracked based on the damage field evolution results. The application is suitable for fracture process analysis and safety evaluation of different types of complex high dam concrete structures.

The invention provides an underground hydraulic fracturing crack monitoring and feedback method, device and system. The method comprises the steps that underground multi-source data in the fracturing process are obtained, and the underground multi-source data comprise fracturing pipeline water pressure data, hydraulic system oil pressure data, fracturing fluid flow data, crack propagation form data, crack inlet temperature and pressure data and proppant concentration data; performing anomaly recognition on the underground multi-source data by adopting a preset judgment threshold value to obtain various anomaly recognition results; and under the condition that any abnormal recognition result represents that the abnormal working condition exists, a feedback control mechanism is triggered, and the feedback control mechanism at least comprises acousto-optic early warning and crack expansion form adjustment. The problem that a hydraulic fracture fracturing monitoring method in the prior art cannot achieve real-time feedback control in the fracturing process is solved.

This invention discloses a similarity simulation method for staged hydraulic fracturing of the roof. By optimizing the proportioning scheme of similar materials, the constructed similar material model maintains a similarity to the field prototype in terms of mechanical parameters and structural characteristics. A three-dimensional evaluation system covering depressurization effect, permeability enhancement effect, and reservoir stimulation effect is established, quantifying monitoring data such as acoustic emission, strain, and wave velocity into a comprehensive fracturing effect index. This method can accurately characterize the initiation and propagation laws of the fracture network, quantitatively evaluate the depressurization and permeability enhancement effect of staged fracturing, and provide reliable experimental basis for optimizing field fracturing process parameters. This method solves the problem of single evaluation dimensions in traditional laboratory evaluations, significantly improving the scientific nature and engineering guidance value of fracturing effect evaluation.

The invention provides a method and equipment for evaluating the ability of microparticles to migrate into branch fractures and a storage medium, and the method comprises the following steps: obtaining fracture parameters, fracturing fluid parameters and microparticle parameters according to shale gas fracturing construction conditions; establishing a CFD-DEM fluid-solid coupling model for transporting the microparticles into the branch seams according to the obtained parameters; and based on a CFD-DEM fluid-solid coupling model, obtaining a mechanism of migrating the microparticles into the branch seams and results of migrating the microparticles into the branch seams under different parameter conditions, and evaluating the ability of migrating the microparticles into the branch seams by using the seam entering efficiency. The computer equipment comprises a processor and a memory. The method for evaluating the ability of the microparticles to migrate into the branch seam can be realized. A computer program is stored in the storage medium. The method provided by the invention has a supporting effect on evaluation of the ability of the shale fracturing microparticles to migrate into the branch fracture, and provides a direction for related optimization design and on-site construction process of the microparticle proppant in the subsequent shale fracturing process.

The invention discloses a charpy micro-size impact sample design method based on energy distribution in a fracture process, a sample and an impact test method.The charpy micro-size impact sample design method comprises the steps that a micro-size charpy impact sample similar to a standard sample in size and shape is designed, and stress state changes in the impact process are analyzed through a finite element method; after determining a crack initiation starting point and an instability boundary of the sample, calculating the elastic work, the plastic work and the tearing work of the micro-size sample, and judging the effectiveness of the micro-size Charpy impact sample according to the proportion of the plastic work; according to the method, the effective micro-size Charpy impact sample is prepared according to the effective micro size, and the equivalent impact energy of the standard-size Charpy impact sample is obtained according to the conversion of the plastic energy and the ligament volume, so that the test consumption of the GH4169 type high-cost alloy is reduced, and the high-throughput and special state test is realized; reliability and practicability of data are guaranteed, and the method has important engineering application value in the field of research and development of high-end equipment such as aerospace and nuclear energy.

The utility model discloses a fault fracture expansion speed measuring device which comprises an objective table, a hydraulic machine, a high-speed camera, a positioning transmitter and a control system, a pressing plate is fixed at the telescopic end of the hydraulic machine, and the pressing plate can apply fracture pressure to a sample placed on the objective table according to a Brazilian splitting test mode under the driving of the hydraulic machine. The high-speed camera is installed on an objective table on the front side of the hydraulic machine, the positioning emitter is installed in the center of the pressing plate and determines the position of a sample on the objective table through vertical light rays emitted by the positioning emitter, and the high-speed camera, the positioning emitter and the hydraulic machine are all connected with the control system. The hydraulic machine is adopted to drive the pressing plate to apply fracture pressure to the sample, fracture control over the large sample is achieved, meanwhile, the fracture process of the fault sample is monitored through the high-speed photography technology, monitoring and recording of the fracture process are visually and accurately achieved, and obtained data are more accurate; and the calculation accuracy of the fault extension speed is improved.

The application belongs to the technical field of oxide glass ceramics, and discloses a high-strength quasi-plastic zirconia-reinforced glass ceramic as well as a preparation method and application thereof. The glass ceramic is prepared by uniformly mixing glass raw materials, ZrO2 nano ceramic particles and fluxing agents to obtain mixed slurry, drying to obtain mixed powder, molding and cold isostatic pressing to obtain a green body, melting and heat preservation at 1200-2200 DEG C, and then cooling to obtain the glass ceramic. The glass raw materials include SiO2, MgO, Al2O3 and Re2O3. The glass ceramic has high hardness (> 7 GPa), compressive strength (≥ 4 GPa), high wear resistance and damage resistance, and a thermal expansion coefficient of (3-9) × 10 ‑6 -6, indentation toughness greater than 3 MPa·m 1 / 2 , and quasi-plastic characteristics in the fracture process, i.e. the stress-strain curve presents obvious nonlinear fracture, and can be applied in the fields of intelligent devices, semiconductors, glass coatings or precision instruments.

The invention relates to the technical field of mining engineering, and particularly discloses a liquid nitrogen cold impact and hot steam alternating coal seam fatigue fracturing and permeability increasing method. According to the method, a system comprises a liquid nitrogen injection system, a steam generation system with inert gas injection, a three-dimensional drilling network and a monitoring regulation and control system. The preparation method comprises the following steps: firstly, constructing a main branch drilling network and installing regulation and control equipment; then, multi-stage gradient circulating fracturing based on damage degree feedback is executed, and the alternate cooling and heating effects of crack initiation, expansion and stabilization stages are sequentially carried out; process parameters and action directions are dynamically adjusted according to acoustic emission and temperature field data; and finally, pipeline purging and drilling hole sealing are conducted. The method can be used for fracturing and permeability increasing operation of the low-permeability coal seam and has the advantages that the controllability of the fracturing process is high, the fracture network development is uniform, and the connectivity is good; in addition, the method has the advantages that process parameters can be dynamically adjusted, and the method can meet the requirements of coal cracks in different development stages.

The invention provides a power transmission line icicle radial breaking strength testing device and method, and relates to the technical field of power transmission line icing testing. By integrating the icicle growth module, the icicle clamping mechanism and the thrust applying and detecting system, a special closed technical scheme for icicle testing is formed. According to the invention, firstly, water is dripped to the power transmission conductor in a low-temperature environment, so that the natural growth forming process of icicle is simulated, and the test is closer to the real working condition; the icicle clamping mechanism is used for clamping icicles through a clamping jaw assembly; the thrust applying and detecting system applies controllable thrust to the clamping jaw assembly and records the value of the thrust borne by the icicle in real time, accurate collection of thrust data is ensured, and quantitative evaluation of the mechanical property in the icicle fracture process is achieved.

The invention discloses a modeling and simulation method for propping agent migration and crack dynamic expansion in hydraulic fracturing. The modeling and simulation method comprises the steps of constructing a full coupling control equation set, defining a key coupling mechanism, solving and dispersing numerical values, and extracting, evaluating and optimizing results. Complete synchronization and bidirectional coupling of rock fracture, fracture flow and particle transport are realized in the same frame, the theoretical defects of a traditional decoupling method are overcome, the physical nature of the fracturing process is reflected more truly, a full-coupling physical mechanism of rock fracture, fluid flow and particle transport in the hydraulic fracturing process is reflected truly, and the method has the advantages of being simple in structure and convenient to operate. And a reliable tool is provided for fine design of a fracturing scheme. The coupling framework is not only suitable for conventional hydraulic fracturing, but also can be expanded to be applied to simulation of complex processes such as pulse fracturing and clean fracturing fluid, and is wide in application range.

The application discloses a shale bedding fracture propagation geometric parameter calculation method, which comprises the following steps: establishing a differential equation group of a shale bedding standard layer according to an elastic mechanics theory, integrating the differential equation group into a partial differential equation group; transforming the partial differential equation group into a common differential equation group, and solving a general solution of the common differential equation group; solving constants in the general solution of the common differential equation group by using a linear spring controlled bedding boundary condition; obtaining a shear slip calculation model of the shale bedding under a space coordinate system; establishing a geometric parameter calculation equation of a shale bedding fracture, and coupling the shear slip calculation model of the shale bedding to obtain a shale bedding fracture propagation geometric parameter calculation model; and performing dynamic simulation on a fracture propagation in a shale gas volume fracturing process, and obtaining a calculation result of a shale bedding fracture propagation geometric parameter. The calculation result of the shale bedding fracture propagation geometric parameter obtained by the application is reliable, and provides a technical reference for shale gas exploration and development and other related work.

The application provides a casing deformation prediction method and system for volume fracturing process based on energy theory. According to the energy conservation and material balance principle, the total energy injected into the stratum in the volume fracturing process is considered to be converted into pressure energy of fluid in the fracture, kinetic energy of fluid in the fracture, elastic deformation energy and surface energy of rock, friction energy consumed by fluid flow in the fracture, pressure energy consumed by fluid filtration in the fracture, deformation energy of cement sheath and casing deformation energy, and then the extreme work principle is used to solve key parameters such as casing deformation load and displacement, so that the prediction accuracy of the casing deformation degree is improved, and basic basis is provided for the optimization of fracturing design, casing damage prevention and treatment.

The invention belongs to the technical field of CO2 fracturing, and particularly relates to a CO2 fracturing crack propagation simulation experiment device and a simulation method thereof. The device comprises a CO2 fracturing medium pumping system, a triaxial stress loading system, an acquisition module and a data calculation control system. The CO2 fracturing medium pump injection system comprises a CO2 injection system, an N2 injection system and a water phase injection system and is used for simulating different CO2 fracturing process artificial fracture expansion forms; the acquisition module is used for acquiring actual wellbore parameters, reservoir parameters, CO2 physical property parameters and CO2 injection parameters; and the data calculation control system is used for calculating the instantaneous temperature and pressure of CO2 at a perforation shot hole in the early stage of fracturing according to the actual shaft parameters, the reservoir parameters and the CO2 physical property parameters, and calculating experimental CO2 injection parameters according to the CO2 injection parameters. The problems that an existing simulation device has few simulation working conditions and cannot accurately simulate actual working conditions are solved.