43 results about "Geomechanics" patented technology

The invention belongs to the technical field of oil and gas field exploration and development, and discloses a fractured-vuggy reservoir ground stress prediction method and system based on discrete elements and finite elements. And taking the obtained boundary stress direction and size as boundary conditions, and combining with a pre-constructed fusion model to obtain the three-dimensional stress of the research area, thereby completing the fracture-vuggy reservoir crustal stress prediction process. The construction process of the fusion model comprises the steps that firstly, a discrete fracture network model and a geomechanical grid model are established, then the discrete fracture network model and the geomechanical grid model are fused, after fusion, three-dimensional heterogeneous parameters are given to the fusion model, and the construction process of the fusion model is completed. The method can accurately and efficiently simulate the three-dimensional distribution rule of the current stress field of the fracture-vug type reservoir, and is of great significance to oil-gas exploration and development.

This application discloses a lithofacies analysis system and method based on a shale geological-mechanical coupled lithofacies classification system, relating to the field of shale lithofacies analysis. The system construction module determines the geological-mechanical coupled lithofacies classification system based on information data from the data acquisition module; the prediction module determines single-well lithofacies prediction information; the feedback adjustment module adjusts the single-well lithofacies prediction information based on set rock mechanics and geostress parameter ranges to obtain adjusted information; the three-dimensional model construction module uses a genetic algorithm to perform seismic attribute embedding and integrated inversion based on seismic attribute data and adjusted information, and uses a co-kriging method to construct a three-dimensional model of well-seismic co-modeling of geological-mechanical coupled lithofacies; the parameter model determination module uses a layer-control-facies dual-control method to control constraints and determine the heterogeneity of the geological-mechanical characteristics of shale layers in three-dimensional space, providing a basis for establishing production areas for the exploration and development of artificial oil and gas reservoirs.

A method is described for characterizing near-wellbore lithology, mineralogy, and heterogeneity, including receiving azimuthal gamma ray data from a horizontal well; calculating a difference between an up-sector gamma ray signal and a down-sector gamma ray signal and normalizing the difference by an average gamma ray value to generate a gamma ray difference value; using the gamma ray difference value to identify heterogeneous intervals along the horizontal well to generate a heterogeneity index; and using the heterogeneity index for at least one of geomechanical analysis of wellbore stability, drilling performance analysis, fracturing decisions, and production performance diagnosis. The method is executed by a computer system.

The embodiment of the invention provides a low-order fracture mechanical property determination method and system and a storage medium, and belongs to the field of geological structure analysis. Comprising the following steps: determining geometric information of bead-like seismic reflection of low-sequence fractures according to three-dimensional seismic data of a characteristic research area of the low-sequence fractures so as to obtain a trunk trend of the low-sequence fractures; establishing a development mechanism numerical simulation model of the low-sequence fractures according to the structural geologic features of the low-sequence fractures and the reservoir geomechanical parameters; according to the development mechanism numerical simulation model, the mechanical property type and the corresponding trend of the low-sequence fracture are determined; and determining the mechanical property of the low-order fracture according to the trunk trend, the mechanical property type and the corresponding trend of the low-order fracture. According to the method, geophysical data and a finite element numerical simulation technology are comprehensively applied, the method can be applied between ultra-deep carbonate rock stratum trunk strike-slip fault zones, and technical support is provided for implementing efficient exploration of low-sequence fault zone oil and gas reservoirs.

The application discloses a kind of multi-scale modeling and fracture simulation method for compressed air energy storage cover layer integrity evaluation, steps include: constructing multi-scale heterogeneous geomechanics model;Establish the fatigue damage constitutive relationship under rock loading and unloading condition;Establish fracture simulation control equation;Multi-scale calculation strategy and local adaptive grid are constructed;Cyclic loading condition simulation and integrity quantitative evaluation are carried out.The application is designed for the core damage mode of CAES gas storage low pressure fatigue, compared with general structure analysis software, the pertinence and accuracy of cover layer integrity evaluation are higher, the heterogeneous geological characteristics of cover layer are truly reflected, the process of crack initiation and propagation in cover layer under cyclic injection and production conditions is accurately simulated, and the advanced prediction and quantitative evaluation of cover layer integrity failure risk are realized.

The present invention discloses an anchor rod construction device and method for large-scale geomechanical physical simulation tests. It consists of a fixed guiding system, a rotary propulsion system, a telescopic clamping system, and a power control system. The fixed guiding system includes a U-shaped frame and a sliding rod, which are used to fix the drilling device and provide a sliding platform for the telescopic clamping system; the rotary propulsion system includes a roller screw and a servo motor, which can achieve the steady drilling of a slender anchor rod during the rotation process; the telescopic clamping system includes a telescopic rod, a chuck, a rotating cone, and a clamping frame, which are used to clamp the slender anchor rod for rotation and drilling. The power control system includes a console, an air pump, and a servo motor, which provide a power source for the slender anchor rod. The present invention can achieve the drilling of slender anchor rods in any orientation such as the side wall and vault of a tunnel in a model test, and can truly restore the anchoring and support process of an actual tunnel project, providing technical support for carrying out large-scale physical simulation tests to deeply study the stability of the anchoring and support of underground projects.

The present application belongs to the technical field of geological engineering monitoring, and particularly relates to a geological stability monitoring device for salt cavern energy storage, aiming to solve the problems of single monitoring dimension, existing blind area and insufficient sensitivity in identifying creep. The monitoring device is internally provided with a geological stability monitoring system, and the system comprises: a surface multi-source deformation sensing unit, a shaft deep layer strain detection unit, a microseismic global activity monitoring unit and a cavity shape sensing unit, which are used for collecting surface and deep multi-dimensional data; a geomechanics digital twin and evolution analysis unit, which constructs a mechanics model and dynamically inverts real-time data as a constraint boundary; a stability discrimination and risk early warning scheduling unit, which outputs an evaluation report based on the inversion result and triggers an early warning. Through the deep coupling of multi-dimensional full-space perception and mechanics model, the present application effectively reduces the perception blind area and improves the accuracy of salt rock creep risk prediction, thereby providing a technical guarantee for the long-term safe operation of the salt cavern energy storage power station.

This invention belongs to the field of numerical simulation technology for oil and gas reservoir development, specifically relating to a numerical simulation method for enhanced oil recovery (EOR) through carbon dioxide injection into coalbed methane. The method includes: establishing a three-dimensional geological model, a three-dimensional geomechanical model, and a fracture network model using Petrel; establishing a numerical simulation model of coalbed methane components including fractures using the Intersect simulator, and performing historical data fitting based on historical production data; importing the geological attribute field, pressure field, and saturation field at the end of the historical data fitting into the CMG-GEM simulator to conduct thermal simulation of carbon dioxide injection into coalbed methane; importing the simulated pressure and temperature fields back into Petrel, and then using the Intersect simulator to complete the dynamic prediction of thermal drive production. This invention can consider the influence of temperature on CH4 and CO2 adsorption / desorption, improving model accuracy and significantly enhancing the accuracy of production prediction.

This invention discloses a large-scale digital twin simulation and prediction method and system for rockburst, relating to the fields of mine safety and digital technology. The prediction method includes the following steps: constructing a three-dimensional geometric model, obtaining the geomechanical parameters of each rock layer, and assigning the geometric model to form an initial digital twin; collecting multi-source monitoring data from the mine, fusing multi-source heterogeneous data and mapping it to the digital twin model, driving the model state update to keep it synchronized with the physical mine; establishing constitutive equations and performing dynamic time-step solutions; inputting different future mining plans or prevention schemes, simulating possible morphologies of unknown areas, analyzing the impact of mining activities on mine stability, and predicting the dangerous areas, evolution paths, and degree of danger of rockburst under these future scenarios; repeating the above steps with the data obtained after on-site adjustments and monitoring, dynamically adjusting and continuously optimizing the digital twin model.

This invention discloses a method for evaluating the stability of steep slopes in open-pit mines under multiple working conditions, relating to the field of geotechnical engineering stability analysis. The method includes: collecting geological and mechanical data of steep slopes in open-pit mines and constructing a three-dimensional geomechanical model; based on the three-dimensional geomechanical model, obtaining various working conditions of the steep slopes in open-pit mines; defining a time-series-related dynamic loading path for multiple working conditions according to the logical sequence of open-pit mining operations and natural events; applying loads of various working conditions of the steep slopes in open-pit mines to the three-dimensional geomechanical model in numerical simulation according to the time-series-related dynamic loading path, and coupling the simulation to depict the progressive failure process of the steep slopes in open-pit mines; and discretizing the mining plan into a continuous time series. This invention, through multi-working-condition time-series loading and dynamic update simulation, overcomes the limitations of traditional analysis methods that isolate working conditions and fail to reflect dynamic coupling effects, achieving accurate evaluation and risk warning of slope stability.

The application relates to a method for calculating in-situ strength while drilling based on well-seismic fusion information, which comprises the following steps: step 1, constructing an initial mechanical parameter calculation model of a formation to be drilled according to well data and seismic data; step 2, obtaining geological mechanics basic parameters of the formation to be drilled in front of a drill bit according to the initial mechanical parameter calculation model; step 3, calculating geological mechanics strength parameters according to the geological mechanics basic parameters; step 4, calculating formation in-situ strength according to the mechanical strength parameters; and step 5, correcting the formation in-situ strength in combination with the well data to obtain in-situ strength while drilling under different working conditions. The application combines seismic data and drilling engineering data to establish a quantitative relationship between rock mechanics parameters and drilling parameters, and realizes rapid acquisition of in-situ strength while drilling under different working conditions in combination with Mohr-Coulomb strength criterion and experimental analysis correction.

This invention relates to the field of wellbore stability monitoring technology in oil and gas drilling engineering. It provides a drilling collapse pressure early warning device based on a three-dimensional geomechanical model, including an early warning decision module connected to the collapse risk assessment module. This module is configured to monitor the temporal changes of the collapse risk index. When the collapse risk index exceeds a first preset threshold a certain number of times within a set time window, a first-level alarm is triggered. When the collapse risk index exceeds a second preset threshold, a second-level alarm is triggered, where the second preset threshold is greater than the first preset threshold. This invention employs a tiered early warning mechanism, setting two alarm thresholds based on the temporal changes of the collapse risk index. This balances the cumulative risk effect with instantaneous abnormal response, enhancing the timeliness and reliability of the early warning, and is suitable for wellbore stability monitoring needs under complex drilling conditions.

This invention discloses a method for optimizing well layout parameters in a three-dimensional well network for fracturing in thick shale oil reservoirs. The optimization method includes: Step S1: Inputting the logging curve interpretation results of the pilot test well, and calculating the physical and geomechanical parameters of the target reservoir rock; Step S2: Calculating the reservoir quality, completion quality, and overall quality based on the physical and geomechanical parameters, and initially selecting the vertical landing sites for horizontal wells; Step S3: Establishing a reservoir fracturing geological model based on the physical and geomechanical parameters, building an unconventional oil and gas fracturing fracture propagation model, and simulating the vertical fracture height propagation of the initially selected vertical landing sites for horizontal wells; Step S4: Determining the optimal lateral well network density for each sub-layer based on single-well productivity; Step S5: Outputting the three-dimensional well network layout results. This method maximizes reservoir stimulation volume by drilling the fewest horizontal wells, meeting the needs of cost reduction and efficiency improvement.

A method includes taking at least one image of a plurality of returned rock fragments from a wellbore using a camera, analyzing the at least one image with an image analysis program to detect a caving in the plurality of returned rock fragments, constructing a model of the caving, and incorporating the model of the caving into a finite element geomechanics model of the wellbore using a meshing program to create an adjusted model of the wellbore.

This invention belongs to the field of sensor and machine learning technology. It proposes a simulation test system and method for the mechanical properties of rock joints based on the principle of equivalent body force field. The main components include: constructing a geomechanical similarity model based on the principle of equivalent body force field, including a base and a rock mass physical model. When the base moves relative to the interface of the rock mass physical model, the friction between the base and the bottom surface of the rock mass physical model generates uniformly distributed shear stress, which generates equivalent body force intensity inside the rock mass physical model; collecting multidimensional sensing data when the base moves relative to the interface of the rock mass physical model; automatically identifying the rock mass joint extension trajectory based on the multidimensional sensing data and using an improved U-Net machine learning model; obtaining displacement field data through an improved particle image velocimetry combined with an optical flow algorithm; using a Bayesian inference inversion model to invert the mechanical parameters of the joint surface; and evaluating the uncertainty of the inversion results using the Markov chain Monte Carlo method.

This invention discloses a method, system, storage medium, and equipment for diagnosing communication issues during acid fracturing in fractured-vuggy carbonate reservoirs, belonging to the field of reservoir stimulation technology. The method includes: establishing a bottomhole pressure calculation model; collecting geomechanical parameters, reservoir parameters, communication characteristic parameters during acid fracturing, and fracture-vuggy body parameters from previously stimulated wells in the work area, establishing and training a first neural network model to obtain a prediction model for the communication parameters of fracture-vuggy bodies during acid fracturing; collecting geomechanical parameters and reservoir parameters from the target well, and real-time acquiring the communication characteristic parameters during acid fracturing of the target well to construct a real-time dataset; and substituting the real-time dataset into the prediction model to calculate the communication parameters of fracture-vuggy bodies during acid fracturing. This invention employs integrated monitoring technology and data analysis algorithms, enabling real-time monitoring and diagnosis of communication issues during reservoir acid fracturing, providing a basis for decision-making during construction, and improving construction efficiency and reservoir stimulation effectiveness.

This invention discloses a method and system for optimizing spatial collaborative bearing structure support in coal mine roadways, relating to the field of support parameter optimization technology. The method includes the following steps: collecting geomechanical parameters and constructing a three-dimensional initial geostress field numerical model; reconstructing, in the model, a first bearing structure formed by constrained concrete supports, a second bearing structure formed by high-strength UHPC spray coating, and a third bearing structure formed by grouting anchors and their reinforced surrounding rock, and defining their constitutive relations; applying tunneling disturbance and mining support pressure for simulation and extracting collaborative deformation response data; constructing a collaborative bearing capacity evaluation function to quantify the collaborative working performance of the structure; and optimizing the support parameters using an optimization algorithm, with the goal of maximizing the minimum value of the evaluation function, and outputting the optimal support parameters. This invention, through numerical reconstruction and dynamic collaborative coefficient inversion, achieves quantitative evaluation and parameter optimization of the bearing capacity of the triple structure, improving the stability of roadways in fractured soft rock.

The application relates to a method for determining an asymmetric three-dimensional potential sliding surface by using maximum shear strain increment. The method comprises the following steps: establishing a geomechanics model and arranging equidistant vertical lines and measuring points, calculating the position of the measuring point with the maximum shear strain increment on each vertical line; determining the circular in-group to which all the measuring points in the measuring point set with the maximum shear strain increment belong through iteration; forming a preliminary slope surface exposed sliding surface boundary line according to the shape presented by the measuring points in the circular in-group, supplementing the missing boundary measuring points, and obtaining the supplemented slope surface exposed sliding surface boundary line; searching for all the measuring points with the maximum shear strain increment located within the supplemented slope surface exposed sliding surface boundary line, grouping the measuring points with the maximum shear strain increment and the measuring points of the supplemented slope surface exposed sliding surface boundary line, and then sequentially connecting the measuring points to obtain a three-dimensional potential sliding surface; and calculating the stability safety factor of the potential sliding surface. The search result accuracy of the slope sliding surface is improved.

The invention discloses a method for predicting reservoir crustal stress after hydraulic fracturing based on phase field damage, and relates to the technical field of petroleum geophysical exploration, and the method comprises the steps: obtaining logging data, seismic inversion data, core experiment data, fracturing construction parameters and crustal stress test results of a target reservoir; determining a space geometric boundary, natural fracture distribution, rock mechanical parameters, an injected fluid pressure time history and an in-situ ground stress tensor of the reservoir; constructing a three-dimensional geomechanical model comprising a material attribute field, an initial defect, a fluid pressure internal load and a crustal stress external boundary condition according to a space geometric boundary, rock mechanical parameters, natural fracture distribution, an injected fluid pressure time history and an in-situ crustal stress tensor; constructing a system total energy functional based on material attribute space distribution, fluid pressure internal load distribution and crustal stress external boundary conditions in the three-dimensional geomechanical model; variational processing is carried out on the total energy functional, and a continuous damage field is introduced as a phase field variable;

This invention relates to the field of geological monitoring technology, specifically to an intelligent analysis method and system for geological monitoring data. The method first deploys multiple types of monitoring terminals, including those for seismic waves, displacement, seepage, and stress, in the exploration area. Then, it performs multi-scale decomposition on the time-series data, matching the geological body evolution process feature library to divide the evolution stages and generate feature threshold intervals. Anomaly feature extraction and verification are completed through a dual-branch cross-validation architecture, obtaining anomaly feature matching degrees and anomaly point identification sequences. A neural network with geomechanical constraints is constructed to fit the evolution trend and predict instability time intervals. Finally, through multi-dimensional index weighted fusion, a quantitative value of geological activity risk and a risk level identifier are output. This invention can achieve spatiotemporal benchmark unification of data collected by multiple types of monitoring terminals and basic geological exploration data, complete the normalization and integration of multi-source data, quantify the reliability of measurement point data, and improve the integrity and reliability of monitoring data.

A downhole check valve may be used in a wellbore to allow a variety of pressure diagnostics to be easily captured and compared within a single monitor well. Pressure responses from below the check valve are open to the formation and provide detailed stress shadowing, poroelastic pressure response, and other sensitive pressure measurements from the open toe, allowing ingress from the wellbore while additional responses can be obtained above the check valve provided the pressure events below do not overcome the pressure above or the spring setting of the valve. This allows for an increase in available data points from the monitor well and a direct comparison of geomechanical and mechanical responses.

This invention discloses a machine learning-based intelligent ore mining control method and system, belonging to the field of intelligent control technology in the mining industry. The method includes: constructing a geological model of the mining area; inputting the geological feature map of the ore body into the geological model for feature extraction, stability assessment, and comprehensive analysis to generate a geological analysis report; using a Bayesian update method, probabilistically fusing the geological feature map of the ore body and the geological analysis report to obtain a geomechanical map; combining the geomechanical map with real-time monitoring data of the mining area to analyze ore mining risk factors and dynamically adjust the ore mining strategy to generate optimized ore mining instructions. This invention helps improve the ability to finely characterize ore body stability, fracture-sensitive areas, and groundwater-affected areas, and enhances the spatial resolution, risk identification accuracy, and instruction generation targeting of the entire mining control process.

The application discloses a coal rock mass fracture surface prediction method based on ground microseismic monitoring, relates to the technical field of coal rock mass geomechanics and mine safety monitoring, and comprises the following steps: obtaining a microseismic monitoring event data set of a research area; performing DBSCAN clustering analysis on the microseismic events; calculating the possibility grade of occurrence of a potential fracture surface; performing principal component analysis on each event cluster, and extracting the predicted strike and dip angle of the potential fracture surface; based on the time series of the microseismic event values b , calculating the energy gap and its change rate, and further evaluating the size grade of the potential fracture surface; and based on the energy-weighted vertical distance statistical characteristics, quantifying the roughness of the fracture surface. The coal rock mass fracture surface prediction method based on ground microseismic monitoring is adopted, the possibility, spatial occurrence, size and roughness and other parameters of the potential fracture surface of the coal rock mass are comprehensively predicted, and reliable basis is provided for accurate early warning and prevention of coal mine dynamic disasters.

The application discloses a drilling risk prediction method based on geophysical data and related equipment, and the method comprises the following steps: collecting geophysical parameters in a seabed drilling process in real time by using a logging while drilling device; preprocessing the geophysical parameters to generate target logging data; constructing the target logging data into a spatial sequence with depth as an axis, training a dynamic extrapolation model based on the spatial sequence of the drilled stratum by using a preset time sequence prediction algorithm; inputting the real-time target logging data into the dynamic extrapolation model to predict stratum parameters of the un-drilled stratum within a preset distance in front of the drill bit; and coupling the stratum parameters with a preset geomechanical model to generate a dynamic safe drilling window containing a safe range of drilling parameters. The application can effectively predict the geological anomaly in front, significantly improves the safety and operation efficiency of seabed oil and gas drilling, and can be widely applied to the technical field of seabed oil and gas resource exploration and development.

This application provides a method, apparatus, and electronic device for determining the critical displacement in shale gas fracturing, relating to the field of hydraulic fracturing technology. The method for determining the critical displacement in shale gas fracturing includes: establishing a three-dimensional geomechanical model of the reservoir in the target area; obtaining the governing equations for solid deformation and fluid flow under the three-dimensional geomechanical model of the reservoir based on the principle of pore elastic dynamics; performing numerical simulation of the fracturing process according to the governing equations, with the simulated values ​​including geostress and fluid pressure; obtaining the injection parameters when the fault is activated based on the numerical simulation; and obtaining the critical displacement based on the injection parameters. The implementation method provided in this application improves the accuracy of critical displacement determination and provides guidance for safe construction of shale gas hydraulic fracturing.

The application provides a thick alluvium controlled drilling trajectory optimization method, system and storage medium, the method comprises the following steps: generating a smooth candidate drilling trajectory by a first derivative continuous spline interpolation function, establishing a three-dimensional geomechanics model coupled with stratum parameters, and setting the wellbore stress meeting the rock strength criterion as a first hard constraint; performing probability modeling on geological risks to delimit boundaries, setting a safety distance as a second hard constraint, constructing a weighted spatial anisotropic drilling comprehensive cost objective function, fusing a trajectory length, a torque drag and a wellbore instability risk index, adopting a global optimization algorithm to minimize the comprehensive cost under the double constraints, solving optimal control point parameters, and interpolating to generate an optimized drilling trajectory.

The application provides a method for improving soft rock roadway rapid formation by modifying source of long-hole area in underground, comprising the following steps: S1: performing geomechanics test on surrounding rock of a to-be-excavated roadway to obtain physical and mechanical parameters of the surrounding rock, and determining surrounding rock areas on the periphery of the to-be-excavated roadway which need to be modified; S2: drilling the surrounding rock areas which need to be modified to form grouting channels, the number of the grouting channels being at least two; S3: supporting the drilled grouting channels by using casings, the number of the casings being at least two and being arranged along the length of the grouting channels in sequence at intervals; S4: performing perforating and fracturing treatment on the grouting channels with the casings installed; S5: performing grouting modification on the grouting channels to form a grouting modified area outside the to-be-excavated roadway, and simultaneously performing ultrasonic treatment on the grouting channels during the grouting process; and S6: using an excavation and anchoring integrated machine to excavate the to-be-excavated roadway to form a newly-excavated roadway, and the grouting modified area constituting a roof and / or a side slope of the newly-excavated roadway.

This invention relates to the field of geological testing equipment technology, and discloses a multi-rail triaxial loading rock and soil geological mechanics structure testing sensing device and control method. The device includes: a multi-rail triaxial loading rock and soil geological mechanics model; a sensor group, which is a pressure sensor array; a data acquisition module for acquiring pressure information from the sensor group and constructing a pressure distribution matrix based on the pressure information of each loading contact surface; an information processing module for obtaining the loading uniformity of the corresponding loading contact surface based on each pressure distribution matrix; a loading adjustment module for adjusting the posture of the corresponding hydraulic cylinder based on historical data until the loading uniformity meets the standard; the loading adjustment module is also used to adjust the output of the corresponding hydraulic cylinder based on the pressure distribution matrix and historical data. This invention achieves dual optimization of loading uniformity and multiaxial coordination, thereby improving the fidelity, reliability, and intelligence level of rock and soil model testing.