1024 results about "Rock mechanics" patented technology

The invention belongs to the petroleum exploration field, and concretely relates to a compact sandstone reservoir complex netted fracture prediction method. The method comprises the steps of: building a geological structure model and a fracture growth model; testing magnitudes and directions of ancient and modern crustal stresses; completing a rock mechanic parameter experiment; testing rock mechanic parameters and fracture stress sensitivities; developing a fracture rock multistage composite rupture criterion; performing a rock deformation physical test to obtain a peak value intensity; building a relation model between single axle state stress-strain and fracture bulk density; building a relation model between triaxial state stress-strain and fracture bulk density and occurrence; building a relation model between single axle state stress-strain and fracture bulk density; calculating and stimulating fracture parameters under modern conditions; and verifying the reliability of a fracture quantitative prediction result. The method can accurately obtain compact sandstone reservoir complex netted fracture parameters, and perform quantitative characterization, is suitable for quantitative prediction of any fracture mainly with a brittle reservoir, and reduces exploitation risks and costs.

The invention discloses a non-planar network fracturing construction control method for a fractured reservoir, which includes the step: firstly, performing pre-fracturing evaluation by (1) obtaining the intrinsic fracture development degree and directions according to FMI (formation micro-scanner image) logging and conventional logging data, (2) determining man-made fracture directions, (3) judging the angle relation between man-made fractures and intrinsic fractures, and (4) judging the non-planar network fracturing formation adequacy; secondly, establishing a stress field inversion constrained optimization model by utilizing a numerical value inversion method combining multi-well constrained optimization and finite elements so as to obtain numerical simulation of three-dimensional geostress states and rock mechanical parameters of a fractured reservoir area; thirdly, selecting corresponding construction parameters, and fracturing strata so as to force the intrinsic fractures and holes to open as large as possible; and fourthly, according to the opened equivalent number and openness of the intrinsic fractures explained by test fracturing, selecting grain sizes and use amount of propping agents matched with the intrinsic fractures or the holes, and leading fracturing fluid carrying the propping agents to enter the intrinsic fractures or the holes.

The invention discloses a method for preparation of a columnar jointed rock mass similar material sample by a 3D printing technology. The method includes: preparing powdered 3D printing raw materials: powder, columnar jointed column powder, joint needed powder and cementing bonding powder; loading the powdered materials into a 3D printer; establishing a columnar jointed sample three-dimensional model, and inputting the model into the 3D printer to conduct 3D printing; and carrying out after-treatment on the sample at the end of printing. The method provided by the invention applies the 3D printing technology into rock mechanical test for the first time, uses a similar material to simulate the basic characteristics of a columnar jointed rock mass in actual engineering, and has the advantages of simple preparation process, higher production efficiency than artificial sample preparation, and high yield, etc.

The invention provides a full-sew-length three-dimensional crushing data simulation method and device for oil and gas reservoir development. The method comprises obtaining pre-stack seismic data of an oil and gas reservoir development object region, obtaining the pre-stack seismic data to conduct elastic parameter inversion and obtaining an elastic parameter data body of the oil and gas reservoir development object region, constructing a rock mechanic parametric model based on three-dimensional grid nodes according to the elastic parameter data body, calculating stress information on the three-dimensional grid nodes, generating three-dimensional stress field distribution model; and conducting full-sew-length three-dimensional numerical simulation in a crushing process according to the rock mechanic parametric model and the three-dimensional stress field distribution model. The full-sew-length three-dimensional crushing data simulation method and device can improve accuracy and efficiency of crushing data.

The invention discloses a simulating method of the forming process of an unconventional oil and gas reservoir hydraulic fracturing complex fracture net. The method includes the steps of a, reestablishing natural fracture distribution, estimating the properties of natural fractures, obtaining rock mechanical information and stratum stress information of a stratum from log data or a geological model, and obtaining a data file related to the well factory construction process; b, inputting the obtained parameters in an established natural fractured reservoir fracturing model coupling a well cylinder, fractures and the stratum; c, conducting numerical value solving on the model to obtain after-fracturing information such as fracture forms, opening degree distribution and pressure intensity distribution; d, analyzing the fracturing effect through a model calculating result, and making a preparation for numerical value simulation of the later-period production process. The fractured reservoirfracturing numerical value simulating method coupling the well cylinder flowing, the fracture deformation expanding, the multi-state natural fractures and the flowing of fluid in the fractures can quantitatively analyze the form of the unconventional reservoir segmented volume fracture net and is an effectively means for evaluating and optimizing the fracturing scheme.

The invention provides a synchronous measurement method and apparatus for dynamic and static rock mechanical parameters changing with confining pressure, pore pressure, temperature and fluid. The method comprises the following steps: acquiring static rock mechanical parameters by using a static measuring method and acquiring dynamic rock mechanical parameters by using a dynamic measuring method, wherein the static rock mechanical parameters and the dynamic rock mechanical parameters are obtained through synchronous measurement; calculating a dynamic-static difference ratio of rock mechanical parameters based on the static rock mechanical parameters and the dynamic rock mechanical parameters; and restoring a rock mechanical underground in situ model for an oil and gas reservoir based on the static rock mechanical parameters, the dynamic rock mechanical parameters and the dynamic-static difference ratio of the rock mechanical parameters. With the method and apparatus provided by the invention, effectiveness and accuracy of restoration of the rock mechanical underground in situ model for the oil and gas reservoir can be improved.

The invention provides a method and a device for recovering an oil and gas reservoir rock mechanics underground in-situ model. The method comprises the following steps of: measuring rock mechanics parameters of an oil and gas reservoir; counting rock mechanics property influence parameters of the oil and gas reservoir; calculating the anisotropy strength of the rock mechanics parameters; obtaining a correlation between the rock mechanics parameters and the rock mechanics property influence parameters of the oil and gas reservoir; obtaining a correlation between the rock mechanics property influence parameters and the anisotropy strength; and recovering the oil and gas reservoir rock mechanics underground in-situ model by adopting the rock mechanics parameters, the anisotropy strength of the rock mechanics parameters, the correlation between the rock mechanics parameters and the rock mechanics property influence parameters of the oil and gas reservoir and the correlation of the rock mechanics property influence parameters and the anisotropy strength. By the method, the effectiveness and the accuracy for recovering the oil and gas reservoir rock mechanics underground in-situ model can be improved.

A microcomputer-controlled electro-hydraulic servo rock tri-axial dynamic shear-seepage coupling multifunctional test method belongs to the technical fields of rock mechanics and engineering technology and is characterized in that a test apparatus is composed of a loading system, a sealing system, a multiphase fluid injection system, an acoustic emission monitoring system, a deformation monitoringsystem and a data collection system. The test method not only solves technical problems that a tri-axial pressure chamber cannot be used for performing large displacement shear-seepage coupling of rocks under high confining pressure and high seepage pressure, and also can achieve various extended functions on the basis of the technology. The apparatus can achieve servo control loading of force, displacement and strain rate in shear direction and injection seepage of a multiphase fluid during dynamic shear. In addition, the apparatus is equipped with a temperature control system for performingconstant temperature control to the tri-axial pressure chamber at 0-200 DEG C; therefore, a series of extended experiments of dynamic shear-seepage coupling features of rocks under effect of temperature can be carried out.

The invention discloses a quick feedback analyzing system in a tunnel constructing process. The system adopts a scheme: understanding currently adopted designing construction parameters; establishing a tunnel excavation three-dimensional finite element numerical grid calculation model; acquiring surrounding rock layering and convergent displacement monitoring information after a tunnel is excavated; establishing a non-linear support vector machine model; fixing an anchoring parameter according to the actual construction parameter, and optimally identifying rock mechanic parameters by adoptinga differential optimization algorithm; optimizing the construction parameter of an anchoring scheme by adopting a differential evolution algorithm; and optimizing the rock mechanic parameters by calling the differential evolution and optimization algorithms to further solve the construction parameter of the anchoring scheme, and outputting the construction parameter of the optimized anchoring scheme as a construction scheme through a computer display screen to guide the constructors to construct. The quick feedback analyzing system ensures that the monitoring information is used for optimizing the anchoring parameter while being used for identifying the surrounding rock parameters, so that the dynamic information construction is improved to a level of quantitative analysis.

The invention relates to the field of oil-gas field exploration and development, particularly to a quantitative forecasting method of tectonic fissure occurrence. The quantitative forecasting method includes firstly determining a fissure mechanical property and rock mechanics parameters in a research area and restoring a paleotectonic map; secondly performing a numerical simulation of a paleostress field; thirdly selecting an appropriate rock failure principle according to the simulated paleostress field and the fissure mechanical property, and forecasting the best occurrence and the second-best occurrence of paleofissures on the basis of plane shearing strength distribution or profile shearing strength distribution of the stress field in the research area; coupling spatial positions of the paleorock stratum and the current rock stratum based on the simulated ant tracing technique, and then establishing a spatial switching theoretical model of the paleorock stratum and the current rock stratum; performing the quantitative analysis of fissure kinematics characteristics, and forecasting the occurrence of the current fissures according to that of the paleofissures.

The invention discloses a calculating method for the size of a fracturing and broken region of a horizontal well for shale. The calculating method comprises following steps of: A, utilizing the theory of crack propagation available to establish a hydraulic fracture extension model during a shale fracturing process; B, utilizing the theory of rock mechanics available to establish a model for stress field variation during a shale fracturing process; C, utilizing the theory of seepage mechanics available to establish a model for pressure field variation during a shale fracturing process; D, utilizing the rock breaking theory available to establish a rule model for natural fractures; E, combining the above four steps to calculate and represent the size of the fracturing and broken region by means of a calculation flow. The calculating method for the size of the fracturing and broken region of the horizontal well for shale has following beneficial effects: time and money spent on calculating the size of the broken region during fracture of the horizontal well for shale are saved so that the valuation of the size of the fracturing and broken region can be extensively prompted and applied.

Belonging to a rock mechanical determination method, the invention provides a determination method for mesoscopic parameters simulating mechanical properties of an intermittent crack rock. The method includes: firstly sampling an engineering rock mass to be tested, and making a complete and intermittent crack cuboid sample; placing the made sample in a sealed pressure cylinder of a servo test machine, firstly bringing a testing machine pressure head into close contact with the upper end and lower end of the rock sample; applying an axial pressure on the sample according to displacement loading, and conducting loading on the sample till fracture, thus obtaining a sample compression process stress-strain overall process curve, a crack propagation process and a final fracture mode; employing particle flow code in 2 dimensions (PFC2D) to establish a complete sample numerical model, and debugging the mesoscopic parameters continuously to acquire a set of mesoscopic parameters able to reflect complete rock sample test results; establishing an intermittent crack numerical model based on the mesoscopic parameters, carrying out compression process simulation, comparing the simulation results with the intermittent crack rock test results so as to further verify the accuracy of the mesoscopic parameters.

The invention relates to a debris-core-borehole-reservoir multiscale shale reservoir three-dimensional fracturing evaluation method. The method comprises the steps of: (S1) calculating mineral content brittleness indexes in a shale coring position; (S2) building relations among an internal friction angle, I type and II type fracture toughness and rock mechanical parameters; (S3) building shale fracturing evaluation models comprehensively considering a mineral content, elastic parameters, the internal friction angle, a critical strain energy release rate and the rapture toughness; (S4) applying a support vector machine algorithm to obtain a cluster analysis mode between a reservoir fracturing performance and the elastic parameters; and (S5) applying the cluster analysis mode and a reservoir three-dimensional elastic parameter data body to obtain a debris-core-borehole-reservoir multiscale shale reservoir three-dimensional fracturing model. The method can be applied to obtain the fracturing performance of any space position in a shale reservoir, so that the well position selection blindness is prevented, and the fracturing modification effect and the after-pressing yield are improved.

The invention relates to a method for predicting failure pressure of a reservoir with acid damage. The method mainly comprises the following steps of: (1) preparing a standard cylinder rock sample in accordance with experimental conditions; (2) identifying mineral components of a rock cylinder, determining monomineral content, and calculating initial radius of a monomineral cylinder; (3) performing acid damage treatment on the rock sample; (4) testing the standard rock sample, and Young modulus, poisson ratio and compressive strength under the conditions of ambient pressure of the rock sample subjected to acid damage treatment; (5) calculating damage variable of the rock under the conditions of different acid liquor types, acid using amount and acid action time; (6) preparing rock mechanics parameters for predicting the failure pressure of the reservoir subjected to acid damage treatment; and (7) predicting the failure pressure of the reservoir subjected to acid damage treatment. By the method provided with the invention, the defects of the prior art can be overcome, and the problem of prediction precision of the failure pressure of the reservoir subjected to acid damage treatment can be effectively solved so as to provide reasonable basic data for the optimization design for the fracture of the reservoir and improve the success rate of reservoir reconstruction.

The invention provides a Logging GeoMechanics Identify Reservoir (LogGMIR) method. Starting from the perspective of rock mechanics, the method researches the relation between crustal stress and reservoir validity, establishes a reservoir effectiveness evaluation standard and recognizes high-quality reservoirs, forms a set of method and technology applicable to high and steep structure crustal stress calculation and reservoir recognition, establishes a calculation method for the crustal stress of mountain front high and steep stratums and a mechanical standard for evaluating the reservoir effectiveness, provides a brand-new technological support for logging evaluation on the deep fractured sandstone reservoir effectiveness in a work area and provides a reliable geological mechanics basis for formation testing, acidification, crushing and other layer selection processes.

The invention relates to a device and a method for measurement, in particular to the method for calculating the mechanical properties of a series of rock sample materials by recording relationships between testing forces/loads and indentation depths/displacements at different moments. The device comprises a rack, a DC motor, displacement measurers, a rigid flat-bottom pressure head and a sample fixing station, wherein the rack is divided into two layers; the upper layer of the rack is provided with the DC motor of which one end is connected with the rigid flat-bottom pressure head; the displacement measurers are distributed about the rigid flat-bottom pressure head; and the sample fixing station is fixed on a base of the lower layer of the rack. The reliability and effectiveness of the method can be evaluated by comparing basic rock mechanical property measurement results with those obtained by other conventional testing means. In addition, compared with conventional mechanical test methods such as single-pressing tests, single-pulling tests, triaxial compression tests and the like in laboratories, the method has the advantages of short test process, simplicity and convenience of operation, low requirements on samples, economy and the like.

The invention discloses a rock mechanical test loading device under brine corrosion conditions, comprising a container, a ball-end cylindrical indenter, the upper jaw of a fixture, the lower jaw of the fixture and a circulation pump. Glass cement is applied in two pre-reserved slits on a stainless steel frame, an organic glass plate is inserted into the slits, symmetrical screen sandwich grooves are welded on the container, screens are inserted into the symmetrical screen sandwich grooves, a drain hole on the bottom of the container is sealed by a screw plug and a rubber gasket, a ball valve is connected with the container, and the ball valve on the container is connected with a circulating pump through a transparent plastic hose. A rock sample splitting fixture is disposed in the container and consists of the arc-shaped upper jaw and the arc-shaped lower jaw of the fixture, and the upper jaw of the fixture is connected with the ball-end cylindrical indenter. The invention has simple structure and convenient operation, and can simulate the actual operating condition that brine and a flow field cooperatively act on a dissolution cavity in the cavity creating process of gas (oil) storage, thus obtaining more actual and reliable parameters detected by indoor test.

The invention provides a method of determining long-term strength in rock creep tests, and relates to the technical field of rock mechanics. The method includes coring field rock samples; processing rock cores to form test pieces; mounting and adjusting axial and radial displacement sensors for the test pieces; applying axial and radial load to the test pieces until the text pieces are destroyed;acquiring test data, and converting and outputting the test dada; plotting axial and radial creep curves of the test pieces; computing creep Poisson ratios at various moments; determining the long-term strength of rock. The method for determining the long-term strength in the rock creep tests has the advantages that influence of axial and radial deformation in the rock creep procedures on the performance of the rock is comprehensively considered according to actual ductile dilation deformation of the rock, the creep time is segmented, creep Poisson ratio -time curves are plotted, the long-termstrength of the rock is determined according to stress corresponding to data of inflection points of the curves, accordingly, the timeliness of the rock can be effectively reflected by the solved long-term strength, subjective judgment can be eliminated, and the method is simple and reliable, is high in accuracy and is easy to popularize and apply to actual rock engineering.

The invention relates to a method for measuring deep rock-sample initial damage distribution, aiming to provide a simple and feasible method for measuring deep rock-sample initial damage distribution, which can obtain the initial damage distribution situation of a rock sample and further reasonably determine loading mode and loading direction of the rock sample. The method comprises the following steps: processing the rock sample; installing an acoustic detection probe and an acoustic emission probe; carrying out a uniaxial loading test on the rock sample; determining the crack initiating strength of the rock sample; and carrying out comprehensive analysis on three-way acoustic wave velocity and distribution of acoustic emission events of the rock sample, and finally determining initial damage distribution of the rock sample. The method is applicable to a rock mechanical test which serves underground engineering such as deeply-buried hydraulic and hydro-power engineering, traffic, mine and the like.

The invention relates to a method for prefabricating rough fractures in a rocklike similar material specimen and belongs to experimental methods of rock mechanics. The method comprises the following concrete steps: processing a rock specimen, and carrying out a destruction test with a testing machine, so as to obtain a fractured rock specimen containing a single rough through fracture; then, wrapping the fractured rock specimen with a flexible high-temperature-resistant coil, filling the rough fracture with liquid compound materials at high temperature, and naturally cooling; removing the flexible high-temperature-resisting coil, so as to obtain a compound material fracture piece; digitizing the surface appearance characteristic of the compound material fracture piece with a three-dimensional laser scanner; fixing the compound material fracture piece into a specimen processing mould, and then pouring flowable rocklike similar materials; after a similar material specimen is hardened, demoulding and heating so as to enable the compound material fracture piece to be melted to flow out; cooling, so as to obtain the rocklike material specimen containing rough joints. The method has the characteristics of being simple in process, low in cost, good in repeatability and high in precision and has a wide application prospect in a physical and mechanical property test of rock structure planes.

The invention relates to the technical field of preparation of triaxial experiment samples in rock mechanics and discloses a triaxial sample preparation device for low-liquid limit silty soil and a sample preparation method. The device comprises a sample tube, a smoothening device, a vibrator and a loading device. The method comprises the following steps: sleeving a rubber diaphragm in a split cavity; gradually pouring soil sample; controlling the initial dry density through the smoothening device and the vibrator; filling carbon dioxide and air-free water from a base until saturation; and carrying out sample consolidation process according to a secondary dry density. According to the invention, the problem of producing uniform silty soil sample is solved, the split cavity integrates the functions of positioning and sealing so as to improve the dimensional precision and the sealing effect of the sample; a rubber-steel combined vibrating head is adopted to improve the vibration and densification effect; and the matching with a current triaxial apparatus is realized, which reduces the equipment investment; and through the two-stage control of the initial dry density and the secondary dry density, the density of the sample can be optionally appointed within a certain range.

The invention belongs to the technical field of underground engineering, and particularly relates to a method for forecasting rock burst. A method for comprehensively forecasting the approximately horizontal stratum rock burst in high geostress regions comprises the following steps of: A, conducting a rock mechanics test, and preliminarily estimating the rock burst intensity of a project region; B, measuring the three-dimensional geostress of the project region, and then estimating the rock burst intensity of the project region; C, synthesizing geologic sketches, engineering geophysical exploration, advance borehole and other results, building the three-dimensional numeric calculation model of the project region, combining steps A and B, and preliminarily realizing the macroscopic subregional forecasts of rock burst in the project region; and E, comprehensively evaluating, and forecasting the parts of the project region where rock burst is likely to occur and the intensity of the rock burst. The method is based on rock mechanics tests, site geological conditions and computer simulation to carry out multi-factor comprehensive forecast on the underground rock burst at the deep approximately horizontal stratum region; and practical applications show that the method has the characteristics of scientific principle and accurate forecasting.

The invention provides a triaxial compression rheological test system capable of simulating an engineering geological environment, belonging to rock material compression experimental facilities. The remarkable characteristics of the invention are as follows: a test chamber in the triaxial compression rheological test system capable of simulating the engineering geological environment can depend on a normal rheological compression test device to realize the analogue simulation of the variations of a temperature field, a humidity field and a chemical field in the engineering geological environment by utilizing a humidifier, a heater and a fluid tank. The device fundamentally solves the problems of larger deviation of rock mechanics parameters obtained by a laboratory test and a field in-situ test and analogue simulation of a geotechnical wall-rock multi-field coupling environment. The test system has compact structure and low cost, is rather easy to install and dismount test pieces, detectors, pipelines and lead wires, and has stronger adaptability on the test pieces with different lithologies and sizes, thereby providing a set of complete technology and means for the study on the mechanical behavior of the wall-rock stability under a complex engineering geological condition.

The invention relates to a tensile-shearing test system for rock experiments in mechanics and belongs to the technical field of geotechnical engineering. The test system comprises a counter-force device, a vertical load system, a horizontal load system, upper and lower shearing boxes, a measurement system and a base, wherein the vertical load system and the upper shearing box are connected through a tensile plate of which the lower end is provided with two guide slots. The direct shear test for the rock under different tensions can be performed; due to the assembled design of the upper and lower shearing boxes, the rock sample can be conveniently adhered and detached; due to the design mode of the tensile plate and the upper shearing box, free deformation of the rock in the horizontal direction under the horizontal thrust can be guaranteed, and the stability of the horizontal load system under the tensile action can be guaranteed according to the roller row which is arranged in the horizontal load direction. The current situation that the strength criterion of the rock can only be researched by employing the compression shear experimental mode at present is changed, the intensity parameters of the rock under the action of different normal tensions can be provided, and the constitutive relation of the rock under the shear-resistant stress is improved and perfected.

A microcomputer-controlled electrohydraulic servo rock triaxial dynamic shear-seepage coupling multifunctional test apparatus belongs to the technical field of rock mechanics and engineering and is characterized by comprising a loading system, a sealing system, a multiphase fluid injection system, an acoustic emission monitoring system, a transformation monitoring system and a data acquisition system. The apparatus of the invention has the advantages that the technical problem can be solved that an existing triaxial pressure chamber is unsuitable for performing rock large-displacement shear-seepage coupling under high confining pressure and high osmotic pressure; various extended functions based on the shear-seepage coupling technique can be achieved; servo controlled loading of shear-directional force, displacement and strain rate can be achieved, multiphase fluid injection and seepage during dynamic shearing can also be achieved; in addition, a temperature control system is also provided and is suitable for constant temperature control from 0 DEG C to 200 DEG C for the triaxial pressure chamber, so that a series of extended tests such as rock dynamic shear-seepage coupling characteristic test under temperature action can be carried out.