182 results about "Fracture process" patented technology

The invention relates to the technical field of data acquisition and data analysis, in particular to a hydraulic fracturing test crack propagation monitoring system which comprises a monitoring system and is used for monitoring crack propagation behaviors in the hydraulic fracturing process in real time. Constant or dynamically changing confining pressure and axial pressure are provided; the pore pressure dynamic regulation and control unit is used for accurately controlling the injection pressure, flow and saturation of fracturing fluid and simulating fracture propagation behaviors under different seepage conditions; the multi-physics field sensing monitoring network unit is used for collecting strain, sound wave signals and a surface displacement field in the crack expansion process in real time; full-scale monitoring of rock fracture propagation is realized, an influence mechanism of pore pressure and time effect on fracture evolution is disclosed, an accurate prediction means is provided for shale gas development and deep engineering, and the fracturing effect and engineering safety are remarkably improved.

The invention relates to the technical field of rock mechanics and petroleum and natural gas engineering, and particularly discloses a hydraulic fracture fracturing monitoring system, method and device based on optical fiber monitoring, and the system comprises a hydraulic fracturing simulation platform which is used for applying three-dimensional stress to a hydraulic fracturing test piece so as to simulate a stratum stress environment; the fracturing fluid injection device is used for injecting pre-prepared fracturing fluid into the test piece, so that a crack in the test piece expands; a plurality of strain sensor groups embedded in the test piece in the preparation process of the test piece; the optical fiber sensing demodulation device is used for collecting strain data detected by the plurality of strain sensor groups; and the data processing device is in communication connection with the optical fiber sensing demodulation device and is used for acquiring the strain data and processing the strain data so as to determine real-time state data of crack expansion in the test piece. According to the scheme, the fracture strain can be monitored in real time, and the accuracy and controllability of the hydraulic fracturing process are improved.

A fracturing effect determination method for phase transition fracturing deep rock, comprising: obtaining initial data of a true triaxial rock of a fracture hole; fracturing true triaxial rock and obtaining acoustic emission information in the fracturing process; obtaining test data of the true triaxial rock after fracturing; inputting initial data and test data into a preset formula to generate test data; determining quantitative data of fracturing according to acoustic emission information and test data and determining the fracturing effect of true triaxial rock according to the quantitative data of fracturing. The method is implemented using a device comprising a carbon dioxide fracturing device, a true triaxial loading device, a fracturing starter, a storage tank, and a liquid filling device. The device is configured to achieve the quantitative optimization effect of the technical parameters required for the prevention and control measures of energy release in deep engineering rock mass

The invention discloses a whole-section hole circulation loading and unloading fracturing device and a coal mine hydraulic fracturing method. The whole-section hole circulating loading and unloading fracturing device comprises a fracturing pipe, hole sealing bags, a water injection pipe, a sliding pipe and a limiting assembly, a plurality of first holes are formed in the fracturing pipe, a fracturing space is defined between every two adjacent hole sealing bags, and the hole sealing bags communicate with the water injection pipe; the sliding pipe can move in an inner cavity of the fracturing pipe, one end, close to the bottom of the drill hole, of the sliding pipe is sealed, a second hole is formed in the sliding pipe, the first hole and the second hole are divided into a plurality of fracturing hole sets, each fracturing hole set comprises one first hole and one second hole, and when the first hole and the second hole in one fracturing hole set are communicated, the first hole and the second hole in the other fracturing hole set are communicated. The first holes and the second holes in the other fracturing hole groups are arranged in a staggered manner; the limiting assembly limits the position of the sliding pipe in the fracturing pipe and enables the first hole and the second hole in one fracturing hole set to be communicated. According to the method, fracturing equipment does not need to be moved, the fracturing process is simplified, and the hydraulic fracturing efficiency is improved.

The invention provides a hydraulic fracturing fracture net distribution form near-field monitoring method, which comprises the following steps of: arranging a plurality of roof monitoring holes in roadways on two sides of an underground coal mine working surface, installing electromagnetic signal sensors in each roof monitoring hole and on anchor rods of roadway stoping sides, and constructing a full-space monitoring network covering a hydraulic fracturing layer; a data interpretation processing module of the electromagnetic signal time-shifting imaging analysis system comprises a multi-field coupling mathematical model for analyzing and deducing real-time imaging of electromagnetic signals; in the hydraulic fracturing process, an electromagnetic signal sensor is used for monitoring a current field, an electromagnetic field and an ion diffusion field in the rock mass fracture development and expansion process, a monitoring result is substituted into an electromagnetic signal time-shifting imaging analysis system for calculation and feature value extraction, and the fracture net distribution form is deduced through the feature value. According to the invention, the expansion path of the fracturing fluid in the rock stratum can be monitored in real time, the three-dimensional distribution form of the hydraulic fracturing fracture network can be inverted, and a new technical support is provided for the inspection of the hydraulic fracturing pressure relief effect of the underground coal mine.

The invention provides a device system and method for observing liquid bridge morphology and liquid bridge force among viscous particles. The device system comprises a first XYZ three-axis displacement table, a high-speed microscopic shooting device, a liquid bridge forming device, a precise force monitoring assembly, a second XYZ three-axis displacement table, an XYZ three-axis nanometer positioning platform, a Z-axis displacement table, a light source and a windproof device. According to the invention, the precise force monitoring assembly is adopted to realize accurate measurement of liquid bridge force among viscous particles in static and dynamic researches; a high-speed microscopic shooting device is used for recording the formation and fracture process of liquid bridges among the viscous particles; and the liquid bridge force among the viscous particles is researched from multiple directions by using a three-axis displacement table. The method disclosed by the invention is simple to operate, can be used for researching the liquid bridge morphology and the liquid bridge force change rule under the conditions of different liquid volumes, different particle distances, different particle size ratios and different separation speeds, and provides a theoretical basis for the utilization of viscous particles in the industrial process.

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 discloses a fracturing crack long and short axis difference expansion evaluation and control method which comprises the steps that working parameters and a fracturing technology of a fracturing area are obtained, and the working parameters comprise engineering parameters and geological parameters; establishing a physical model of the fracturing position according to the working parameters and the fracturing process, and establishing a numerical simulation model for the difference extension of the long axis and the short axis of the fracture based on the physical model; performing numerical simulation on the working parameters of the fracturing area through the numerical simulation model, analyzing the influence of each parameter on the crack long-short axis difference expansion behavior difference and size according to a numerical simulation result, and establishing a crack long-short axis difference expansion prediction model according to the influence; and according to the extension prediction model, predicting fracturing fracture long and short axis difference extension, and according to a prediction result, adjusting a fracturing process to realize fracturing fracture long and short axis difference extension control.

The invention relates to the technical field of CO2 fracturing, in particular to a CO2 fracturing process determining method, device and equipment for a target reservoir, and the method comprises the steps that a first CO2 fracturing process is selected according to geological parameters of the target reservoir; performing pressure test on the target reservoir by using a first CO2 fracturing process to obtain a first fracturing parameter of the target reservoir; according to the first fracturing parameter of the target reservoir, a preset fracturing sand plugging judgment model is used for selecting a first fracture expansion model of the target reservoir; according to a first fracture expansion model of the target reservoir and the propping agent particle size corresponding to the first CO2 fracturing process, the corresponding sand plugging risk level when the target reservoir is fractured through the first CO2 fracturing process is judged; and if the sand plugging risk level is within the preset sand plugging risk level interval, determining that the first CO2 fracturing process is the CO2 fracturing process of the target reservoir.

The invention discloses a numerical simulation method, device and equipment for ice rock collapse starting and a medium, relates to the technical field of fluid motion simulation, and provides an FDEM-SPH coupling framework. Through a CIE unit in the FDEM method, crack propagation and fracture processes in rock masses are accurately simulated, and after the CIE unit is completely fractured, the FDEM method simultaneously simulates various contact forms between two separated finite units, so that mutual movement and interaction between fractured rock masses can be accurately described; ice and snow melting and movement in the ice-water phase change process are simulated through the smoothed particle flow SPH, and meanwhile, the interaction between ice-water phase change and rock mass fracture movement can be quantified by calculating the contact force between virtual particles in the smoothed particle flow SPH and the surface of a finite element in the finite discrete element method FDEM; the interaction reflects the erosion and impact of the ice-water phase change on the rock mass in the whole process and the actual physical condition in the ice rock collapse starting process, so that the ice rock collapse change more fitting the real condition is described.

The invention discloses a multi-cluster interlayer / in-fracture temporary plugging diversion fracturing process and a product preparation method, and particularly relates to the technical field of petroleum and natural gas exploitation, the fracturing process comprises the steps of dividing fracturing sections according to the physical property of a horizontal section reservoir of a coal-bed gas well, monitoring and automatically adjusting parameters during drifting, injecting prepad fluid to form a main fracture, and injecting sand adding fluid in a stepped mode. Preparing and injecting a temporary plugging material, injecting prepad fluid again to form a new crack, injecting sand-adding fluid into the new crack, replacing the sand-carrying fluid with clear water after fracturing, discharging the fluid and monitoring. The preparation method of the temporary plugging material comprises the steps of raw material mixing, extrusion granulation, drying, secondary extrusion granulation and the like, and the performance of the temporary plugging material is ensured through the measures of a specially designed screw structure, accurate control of temperature and humidity, addition of an auxiliary agent and the like. According to the method, the longitudinal crack coverage rate and the oil and gas recovery rate are increased, accurate control is achieved, the formation damage rate and the accident rate are reduced, it is ensured that the quality of the temporary plugging material is stable, and the formation permeability recovery rate is increased.

The invention relates to the field of textured low-temperature co-fired ceramic materials, in particular to a textured low-temperature co-fired ceramic material and a preparation method thereof. According to the invention, a part of Al2O3 powder is replaced by flaky alpha-Al2O3, and the flaky alpha-Al2O3 is directionally arranged in the green tape along the tape casting direction through tape casting, so that the arrangement mode can play a role in increasing crack deflection and bridging in the fracture process of the textured low-temperature co-fired ceramic material; the bending strength of the textured low-temperature co-fired ceramic material is improved, and therefore the technical problem that an existing textured low-temperature co-fired ceramic material is poor in mechanical property is solved.

The invention provides a dense glutenite reservoir hydraulic fracturing crack track judgment method, which comprises the following steps: on the basis of a particle flow method, considering gravel characteristics of dense glutenite, and constructing a glutenite numerical value description model for a dense glutenite reservoir; on the basis of the glutenite numerical description model, establishing a glutenite hydraulic fracturing model to simulate fracturing progress conditions at different moments in the fracturing process; and on the basis of the glutenite hydraulic fracturing model, in combination with the hydraulic fracture track influence factors, the track extension mode of the hydraulic fracturing fracture encountering gravel is judged. According to the method, the main control factors and the track rule of glutenite crack extension are known, the glutenite crack track change is revealed from the microcosmic perspective, the purposes of optimizing construction parameters and controlling the optimal crack form are achieved, and guidance is provided for glutenite hydraulic fracturing engineering design.

The invention relates to the field of electric power installation equipment, in particular to an electric power line phase-to-phase spacer fracture early warning induction device, and solves the problems of low efficiency, time delay and occupation of extra manpower of a traditional inspection means in the prior art. A signal is sent out through the inevitably accompanying physical deformation of a strain sensing optical fiber in the fracture process of the spacer to carry out judgment and early warning, real-time monitoring is achieved, and the labor cost is reduced. The spacer comprises a core rod, wire clamps are arranged at the left end and the right end of the core rod, and a hollow cavity is formed in the core rod in the axis direction; a hollow cavity is formed in the core rod, a spirally distributed strain sensing optical fiber is arranged in the hollow cavity, the strain sensing optical fiber is used for sensing the stress change of the core rod, and one end of the strain sensing optical fiber extends out of the hollow cavity and is connected with a fiber bragg grating demodulator.

The invention discloses a method for predicting the service behavior of an oil and gas pipeline under a stress corrosion cracking condition, and belongs to the field of material performance analysis and prediction. Firstly, based on a convection diffusion equation, a real stress intensity factor of an oil and gas pipeline crack tip is used as an unknown quantity to obtain a stress distribution condition; then, applying boundary conditions and a crack propagation criterion in fracture mechanics, and performing preliminary calculation to obtain crack propagation behavior characteristics of the one-dimensional semi-analytical model; and finally, calibrating and calculating the diffusion coefficient of the material parameter in the one-dimensional semi-analytical model to obtain real full-life service time information of the oil and gas pipeline material. According to the method, the full-life behavior information of stress corrosion cracking can be quickly obtained, and a partial differential equation does not need to be solved; on the basis of fracture mechanics, the mechanism of repeated fracture and reconstruction of the passivation layer in the fracture process can be reproduced; the full-life service time of the oil and gas pipeline can be effectively predicted, and the parameter calibration method can be applied to other conditions and is wide in application range.

The invention discloses a near-field dynamics simulation method for low-speed impact fracture of ultra-high performance concrete, which comprises the following steps: establishing a completely discrete model of a UHPC component, and realizing coupling of a concrete gel matrix and steel fibers through an Embedded method; a transition unit is introduced, a classic finite element unit and a PeriFEM local unit are connected through keys, force on the keys is modified, and coupling of the two methods is achieved; a continuous local unit is introduced, a motion equation of the local unit is deduced by adopting an explicit central difference algorithm, and an explicit algorithm based on the continuous local unit is constructed and used for solving the motion equation and calculating the damage condition of the UHPC matrix. According to the simulation method provided by the invention, the fracture process of the UHPC under low-speed impact can be effectively simulated, and a new solution of near-field dynamics and finite element coupling is provided.

The invention discloses a fracturing fluid viscosity dynamic regulation and control device and method for a true triaxial hydraulic fracturing experiment, and the method comprises the following steps: (1) starting and detecting whether a true triaxial hydraulic fracturing experiment system operates normally, verifying the accuracy and rationality of a Smith time delay compensation algorithm and adaptive PID control, and applying in-situ stress to a fracturing sample; (2) setting an initial viscosity value, injecting fracturing fluid into the fracturing sample at a constant flow, and synchronously starting an acoustic emission and resistivity signal receiver; (3) the fracturing effect is evaluated according to implementation feedback information such as acoustic emission / resistivity signals and fracturing pressure in the fracturing process, and the fluid mixing proportion is updated to track a new viscosity set value containing time delay compensation; (4) repeating the step (3) until a relatively complex hydraulic fracture structure is formed or the fracture thoroughly penetrates through the fracturing sample; and (5) based on different viscosity change paths set in the step (3), quantitatively analyzing the inhibition or promotion effect of viscosity change on fracture expansion, turning and branches, and realizing the maximization of the fracture network volume of hydraulic fracturing. A double-cylinder injection system capable of adjusting the fluid mixing proportion in real time is introduced, the limitation of traditional static mixing of the fracturing fluid is broken through in combination with a Smith time delay compensation algorithm and self-adaptive PID control, and the complex influence mechanism of dynamic viscosity change of the fracturing fluid on crack propagation and propping agent migration is explored; and the simulation capability and the research depth of the experiment are improved.

The invention discloses a method for evaluating a fracturing transformation effect through combination of forward modeling and inversion, and the method comprises the following steps: building a single-well fine fracturing model based on the heterogeneity and mechanical difference along a well section according to logging and indoor experiment data; a real fracturing process is simulated according to an actual pump injection program, and a fracture height parameter is obtained through forward modeling; calculating the liquid efficiency and the filtration coefficient of the fractured section through a fracture parameter inversion model according to the fracture height parameter in combination with the pumping stop pressure drop data; based on the process, a boundary element method is used for simulating the fracturing process, fracture length and fracture width parameters are obtained, and the fracturing transformation volume is determined by calculating stress field distribution around the fracture. According to the method for evaluating the fracturing transformation effect through combination of forward modeling and inversion, comprehensive, accurate and real-time evaluation of the fracturing transformation effect is achieved, a scientific basis is provided for optimizing fracturing construction parameters, improving the yield of an oil and gas well and reducing the development cost, and a reference is provided for subsequent fracturing design and construction adjustment.

The invention provides a dynamic load-oriented brazed diamond bonding strength testing device and method. The dynamic load-oriented brazed diamond bonding strength testing device comprises a base, a test framework, a self-adaptive sample holding unit, a data acquisition unit and a visual auxiliary alignment unit, the self-adaptive sample holding unit realizes stable clamping and angle adjustment of a sample through a rotatable platform, a translation bottom table, a hydraulic clamping cylinder and an angle adjusting piece; the data acquisition unit acquires a shear force-displacement curve by using a fiber bragg grating sensor, and a high-speed camera records a fracture process; and the vision-assisted alignment unit (high-resolution industrial camera) is used for calibrating the positions of the sample and the pressure head. The method comprises the steps of intelligent pre-characterization clamping, variable load dynamic shear testing, in-situ fracture mode judgment, multi-mode effective fracture area measurement and multi-dimensional strength characterization. According to the invention, the sample positioning and clamping stability is improved, the loading interference is reduced, the interface bonding strength is quantitatively and reliably represented under the dynamic load, and the test accuracy and repeatability are guaranteed.

The invention discloses an online variable-viscosity fracturing method for a high-order coal reservoir, which comprises the following steps: sequentially carrying out a perforation stage, a prepad fluid stage, a sand-carrying fluid stage and a displacing fluid stage by adopting a bridge-shooting combined fracturing process; in the early stage of the prepad fluid stage, clear water is adopted as fracturing fluid, and the displacement is increased in a stepped mode according to the first incremental quantity; in the later stage of the prepad fluid stage, the fracturing fluid system with the first concentration is adopted, and the displacement is continuously increased to the maximum displacement in a stepped mode with the second increasing amount larger than the first increasing amount; in the early stage of the sand-carrying fluid stage, a fracturing fluid system with the first concentration is adopted, and the maximum displacement is kept; in the middle stage of the sand-carrying fluid stage, the fracturing fluid system with the second concentration is adopted, and the maximum displacement is kept; in the later stage of the sand-carrying fluid stage, a fracturing fluid system with the third concentration is adopted, and the maximum displacement is kept; the first concentration, the second concentration and the third concentration are sequentially increased or decreased. According to the method, the fracture length and the fracture network complexity can be effectively increased, and then the coal reservoir transformation volume is enlarged.

The invention discloses a thermoplastic elastomer dynamic fatigue performance testing device and method, and belongs to the technical field of elastomer material testing, the thermoplastic elastomer dynamic fatigue performance testing device comprises a test rack, a transparent partition plate is installed outside the test rack in a combined mode, and the transparent partition plate seals the test rack to form a test sealing bin; the loading units are symmetrically distributed on the test rack left and right and located in the test sealing bin, and an elastic material is connected between the two loading units; the temperature sensor is mounted on the inner wall of the transparent partition plate; the control mechanism is horizontally fixed in the experiment sealing bin of the test rack; the loading unit is mainly used for providing dynamic tensile stress for the elastic material, the industrial camera records the whole fatigue fracture process, and the steel knife mechanism can perform notch preforming on the surface of the elastic material through the steel knife seat, so that fatigue damage is formed at a single point or multiple points in the middle of the elastic material; therefore, the time required by the whole fatigue fracture process is obviously shortened, and the test efficiency is improved.

The invention relates to a system and a method for testing the whole hydraulic fracture process of a concrete structural surface. The system comprises a high-water-pressure loading device, a concrete-steel combined container and a hydraulic fracture whole-process nondestructive monitoring device, the high water pressure loading device is used for filling water and pressurizing the concrete-steel combined container; the concrete-steel combined container is used for the concrete member with the prefabricated crack to bear water filling pressure; the hydraulic fracture whole-process nondestructive monitoring device is used for monitoring strain, deformation and damage of the concrete member with the prefabricated crack; the high water pressure loading device is connected with the concrete-steel combined container, and the concrete-steel combined container is connected with the hydraulic fracture whole-process nondestructive monitoring device. The method is more suitable for the pressure water environment during actual work of the concrete dam, and data support is provided for theoretical analysis of the concrete hydraulic fracture damage evolution process.

The invention discloses a deep shale gas horizontal well full-well section geology-engineering-fracture network construction potential dessert identification method. The method comprises the steps that reservoir physical property quality parameters, rock mechanical parameters, rock ground stress parameters and fracture network construction potential parameters of a target well are determined according to full-well section original logging and interpretation data of a horizontal well section of the target well; calculating a reservoir physical property quality index, a rock stress brittleness index and a fracture network construction potential index of the whole well section of the horizontal well section of the target well; determining a reservoir physical property quality index threshold value, a rock stress brittleness index threshold value and a fracture network construction potential index threshold value; and according to comparison of the reservoir physical property quality index, the rock stress brittleness index and the fracture network construction potential index with corresponding threshold values, sweet spot identification grades are divided for the target well, and a targeted fracturing process is recommended according to field construction experience. According to the method, the prediction accuracy of the geological engineering dessert of the deep shale reservoir with strong heterogeneity is improved, and a favorable theoretical basis is provided for differential staged fracturing design of deep shale gas.

The invention discloses a sleeve deformation simulation experiment system in a deep coal bed gas fracturing process. The sleeve deformation simulation experiment system comprises a test sleeve, a strong-plasticity deep coal rock sample, a sleeve deformation visual monitoring module, a target horizon deformation and crack propagation monitoring module, a fracturing fracture network global monitoring module, a liquid injection module and a ground stress loading module. The sleeve deformation visual monitoring module is used for monitoring the deformation damage condition of the test sleeve; the target horizon deformation and crack propagation monitoring module is used for monitoring surface deformation and crack propagation conditions of the sample; and the fracture network global monitoring module is used for monitoring the fracture expansion scale. According to the system, multi-load application of casing deformation can be achieved, the strong plasticity characteristic of deep coal bed gas is simulated, the fracture expansion scale and the casing deformation amount in the hydraulic fracturing process are accurately monitored, and risk level prediction of the influence of the hydraulic fracture expansion rule on casing deformation is achieved. The invention further discloses a sleeve deformation simulation experiment method in the deep coal bed gas fracturing process.

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 relates to two-way integrated hydraulic fracturing equipment and a using method, and belongs to the technical field of coal mine roof cutting. The system comprises a first drill rod, a second drill rod, sealing devices and a kerf fracturing device, the first drill rod and the second drill rod are hollow rods, one end of the first drill rod and one end of the second drill rod are connected through the kerf fracturing device, and the sealing devices are arranged at the other end of the first drill rod and the other end of the second drill rod respectively; the sealing devices adopt hole packers, the two hole packers are connected through a sealing pipeline, and the sealing pipeline sequentially penetrates through the first drill rod, the kerf fracturing device and the second drill rod. The problems that in the prior art, drill hole joint cutting is discontinuous, joint cutting and fracturing procedures are separated, and a hole sealing area is inaccurate are solved, the overall hydraulic fracturing effect of drill holes is improved, the failure rate in the equipment operation process is reduced, and the effects of sequential joint cutting and segmented fracturing in the drill holes are achieved.

The invention discloses a test device and method for simulating fracture of a mine earthquake source. The method comprises the following steps: putting a rock sample into the test device and mounting the test device to a triaxial testing machine; a loading method is determined according to the fracture type of the mine earthquake source needing to be simulated, a triaxial testing machine is used for applying load, and if pressure or tension needs to be applied to the rock sample, the tension or pressure is applied to the inner frame to drive the upper clamping part and the lower clamping part to apply required stress to the rock sample; when shear force needs to be applied to the rock sample, pressure is applied to the two shear stress loading parts at the same time, then the lower clamping part is driven to move along the horizontal sliding groove relative to the upper clamping part, the needed shear force is applied to the rock sample, and a compression-shear composite fracture or tension-shear composite fracture test is achieved. The fracture processes of different mine earthquake sources are effectively simulated, so that the acoustic emission data corresponding to the fracture processes of the different mine earthquake sources are obtained, and data support is provided for revealing fracture evolution mechanisms of the different earthquake sources and disaster source early warning.

The invention discloses an abrasive water jet rock breaking simulation method based on a DEM-CFD coupling method. Establishing an EBPM bonded rock mass discrete element model through a discrete element DEM, and calibrating mesoscopic parameters through a virtual mechanical test; simulating a water-abrasive two-phase flow through fluid dynamics CFD, and adopting a Gidaspow drag force model; the DEM-CFD bidirectional interface realizes real-time coupling; carrying out post-treatment to extract an erosion morphology and a crack network; the method can effectively simulate the rock mass fracture process and the large deformation behavior in the water jet rock breaking process and reveal rock mass damage evolution from the microscopic scale, and can be widely applied to research of water jet assisted rock breaking in the fields of civil engineering, mining, petroleum energy, marine resources and the like.

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.