452 results about "Crustal stress" 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 relates to a true three-dimensional loading model experiment system for highland stress, comprising an intelligent hydraulic control system, a high-pressure loading system and a counterforce device system, wherein, the high-pressure loading system is arranged in the counterforce device system; an intelligent hydraulic control test bed of the intelligent hydraulic control system is connected with the high-pressure loading system through a high-pressure oil pipe; the high-pressure loading system comprises a jack and loading plates; one end of the jack is connected with the loading plates; the other end of the jack is connected with the counterforce device system; and six loading plates connected with the jack respectively cling to front, rear, left, right, upper, lower side surfaces of a trial model. The system has the advantages of synchronous and independent highland stress loading, high loading automation degree and loading accuracy, more loading functions, the realization of the axial loading opening of a cavity, high rigidity of the loading system, good integral stability, simple and convenient operation and so on. The system can be widely used in deep underground cavity model experiment and research in engineering fields such as hydroelectric power, transportation, energy, mine, national defense and so on.

The present invention relates to a shale gas reservoir crustal stress logging prediction method based on a rock physics model. According to the method, a shale gas reservoir rock physics model which takes kerogen particles into consideration is established, so as to predict a longitudinal and transverse wave velocity of the logging; based on the above, a maximum and minimum horizontal principal stress and a fracture pressure of the reservoir are calculated; and an accurate stress assessment of a shale gas reservoir is carried out while a transverse wave logging is not provided. The beneficial effects of the invention are that: the rock physics model in line with characteristics of the shale gas reservoir is established to improve precision of the prediction velocity; and based on the rock physical model, the maximum and minimum horizontal principal stress and the fracture pressure are obtained, so that while the measured transverse wave logging data are not provided, the underground stress can be predicted on the basis of a conventional logging curve, and the prediction result is high in accuracy.

The invention discloses a multifunctional drill bit rock breaking experiment device capable of testing the triaxial strength parameter of rock. The device comprises a main body device, a pressure head structure, a confining pressure system, an acoustic emission system, a temperature control system and a pore material injection system. The device has the benefits as follows: the real temperature, crustal stress and pore pressure of a stratum can be simulated in a closed environment, a triaxial mechanical test and a drill bit rock breaking test can be completed simultaneously, a stress-strain curve of a rock sample, dynamic vibration of a drill bit and a drill column, bit pressure and influences of footage on the rock sample can be determined, an experiment basis is provided for research of mechanical properties of complex oil and gas reservoirs and drill bit rock breakage under multiple conditions, a rock breaking experiment can be conducted while conventional mechanical properties of the rock are tested, two experiments can be completed once after the designed temperature and pressure conditions are met, the total time consumption is reduced, and the utilization rate of underground rock cores can be effectively increased.

The invention relates to a method for controlling roof caving under condition of hardroof in coal seam, which belongs to the technical field of coal mining and tunnel surrounding rocks controlling, and solves the problems of influence by crustal stress, poor controllability, pollution and inapplicability for high gas seam in the prior art. The method comprises the following steps: 1) constructing and boring rock stratum at the top of the coal seam along an open-off cut of a fully mechanized working face at the beginning of mining process and along one side of a return air laneway and a transporting mining roadway of the working face close to a coal column at a primarily mining phase and at a normal robbing phase; 2)implementing the operation of hydraulic slotting along a borehole, wherein the slotting direction is respectively consistent with the direction of the open-off cut, the return air laneway and the transporting mining roadway; and 3) sealing holes at two ends of the borehole, implementing hydraulic fracturing in the boring, and communicating the pressing cracks generated in the adjacent boreholes. The method for controlling roof caving under condition of hardroof in coal seam is used for controlling roof caving of high gas seam and hardroof, and has the advantages of good controllability, no influence by crustal stress, no pollution and easy operation.

The invention discloses an integrated monitoring and early warning system and early warning method for dynamic condition of deep well drivage construction. The system comprises a monitoring and controlling system platform and a system signal collection unit. The method comprises collecting geological condition data about the deep well drivage construction, arranging an acoustic emission signal sensor and a microseismic pick up seismic station on the roadway to collect internal fracture and instability precursor signals of surrounding rocks, arranging a macroscope deformation and pressure data collecting device for surrounding rocks is arranged, transmitting the internal fracture and instability precursor signals of surrounding rocks, crustal stress, impacting tendency of coal-rock mass, drilling yield, construction geological condition data, support pressure, surface convergence deformation, drilling inner stress and drilling inner damage signal to a monitoring system unit, laying out controlling scheme and construction solving method by the system when an early warning unit delivers early warning. The integrated monitoring and early warning system and early warning method for dynamic condition of deep well drivage construction is scientific in system, safe and practical, and strong in effectiveness. In-time monitoring and early warning for well construction under high stress is realized.

The invention relates to a multifunctional physical simulation test system for coal engineering. The system comprises a test chamber, a model forming subsystem, a hydraulic loading control subsystem, a test subsystem and a gas pumping and injecting subsystem, wherein the test chamber comprises a loading frame and a counterforce cover detachably connected to one end of the loading frame; the loading frame and the counterforce cover are coaxially mounted on a base; a guide rail is arranged on the base in an axial direction of the loading frame; and support seats capable of sliding along the guide rail are mounted on the guide rail and are mounted at bottoms of the loading frame and the counterforce cover respectively; a track conveying subsystem for conveying models is detachably connected between the model forming subsystem and the test chamber. The invention further provides a coal model test method. According to the multifunctional physical simulation test system for coal engineering and the coal model test method, operation such as drilling, joint forming, fracturing, coal and gas outburst, excavation and support of underground construction and the like under actions of crustal stress, gas pressure and comprehensive multiple factors can be simulated, and an experimental verification means is provided for coal and gas outburst related occurrence mechanism, prediction and control.

The invention relates to a construction method of consolidating horizontal directional drilling holes by grouting a coal seam baseboard. Along with the continuous extension of coal mining depth and the continuous enlargement of the mining range, crustal stress is enlarged, and the number of abnormal geologic bodies is gradually increased, water pressure is gradually enhanced, hydrogeologic conditions become more and more complex, and water-inrush threat becomes more and more serious. The construction method provided by the invention comprises the following steps of: drilling holes in a coal seam by developing a drill field in a coal heading of a working surface, wherein the drilling direction points to a water resisting layer and a water bearing layer of the coal seam baseboard; rotatably drilling the coal seam baseboard for a certain depth to carry out hoist drilling and broaching, installing a primary hole sealing sleeve to seal the hole by grouting, cleaning the bottom of the hole after the grout is solidified; and then consolidating the hole by a primary sleeve, consolidating the hole by a secondary sleeve, and carrying out directional drilling to make the drilling hole extend along a preset consolidating layer according to the designed track to finally form the drilling hole. In the invention, the entire consolidation of the coal seam baseboard of the regional working surface is realized through designing the drilling hole track, determining the drilling hole consolidating radius and reasonably arranging the directional drilling according to the analysis to the water resisting layer and the water bearing layer.

Disclosed in the invention is a multi-information coupling prediction method of coal and gas outburst danger, which is achieved by establishing a multi-index coupling prediction model to detect indexes including original gas pressure of a coal layer, the original rock stress, the critical burst gas pressure of a coal sample, the mechanical performance of coal body, the exploit influence, the drilling cutting gas desorption index, the drilling cutting quantity index and the like, therefore to coupling predict the coal and gas outburst danger. By the multi-information coupling prediction method, the information of the coal and gas outburst danger can be fully complemented; the gas and crustal stress outburst danger prediction is carried out; the defects of insufficient complementation information of a single-index and inaccurate prediction are overcome; and the accuracy of the coal and gas outburst danger prediction is improved.

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 for tracking and early warning outburst danger of mine coal and gas in real time, consisting of a data acquisition system, tracking analytic center for data transmission and real-time data and integrated early warning and comprises the following components: a microseismic signal transmission rod, an ultralow frequency microseismic signal sensing element, a microseismic signal acquisition main computer and a three-stage integrated early-warning analysis and specialist diagnosing device. By an ultralow frequency mine-pressure dynamic sensor and a gas sensor, real-time tracking acquisition of an outburst risk signal of the coal and the gas can be realized for the first time; and the three-stage integrated early-warning analysis and specialist diagnosing device is established. The technology solves the problem that the outburst crustal stress of the coal and the gas cannot be monitored in real time and can improve the predicating accuracy of the outburst danger of the coal and the gas by over 90 percent.

The invention discloses a crustal stress rapid measuring device and method of a rock stratum under a coal mine. The device specifically comprises an electric control high pressure pump and a handlance which are integrated, a high pressure pipeline, a packer, a pressure sensor, a flow sensor, a hydraulic fracturing measurement and control instrument and the like. The method comprises the steps that: a segment of tunnel stable in surrounding rock property is selected, and a group of boreholes are formed in the tunnel, and the packer and the high pressure pipeline are installed in the boreholes and are further connected with equipment such as the high pressure pump so as to carry out hydraulic fracturing; in the hydraulic fracturing process, the measurement and control instrument is utilized to monitor and display pipeline water pressure and displacement data curves; according to the recorded pressure data and curves, the magnitude of the crustal stress is automatically calculated; and a colored borehole observation instrument with an annular transparent soft tube and a dial is utilized to observe the crack orientation of the hole wall, and the direction of the crustal stress is further determined. The whole set of system is simple in method, easy to operate, compact in equipment structure, convenient to carry and very beneficial to the rapid and reliable measurement of the crustal stress of the rock stratum under the coal mine, thereby ensuring the safe exploitation under the coal mine.

The invention discloses a testing device for the anisotropism of shale in a true-triaxial condition and a testing method of the testing device, and aims at solving the problems that the conventional testing method for the anisotropism of shale needs at least 3 times of coring, and the anisotropism of the shale at true crustal stress state cannot be really reflected. The testing device comprises a pressurization mechanism, an acoustoelectric testing mechanism and a data processing mechanism, wherein the pressurization mechanism can apply different pressures to X, Y and Z directions, so that the stress state of the shale in a formation condition can be more really simulated. The acoustoelectric testing mechanism can measure the sound wave and the specific resistance of the shale when the mechansim forms 0 degrees, 45 degrees and 90 degrees with shale bedding. The acoustic and electrical anisotropisms of the shale can be obtained through measured sound wave and specific resistance information. The testing device has the advantages that rock samples are easy to obtain, the success ratio is high, the measurement result is real and reliable, and a reference base can be provided for the accurate evaluation of the thickness of a container rock, the accurate evaluation of water saturation and the design of a fracturing operation scheme.

The invention discloses a method for simulating roadway rock burst based on coaction of a static load and a blast load. The method comprises the following steps of: A, selecting cement mortar and ramming a model in a rock model testing machine, and embedding a pressure sensor, an acceleration sensor and a strain gage in the model body; B, maintaining the model body within 28 days, applying initial crustal stress to the model body by utilizing the rock model testing machine, and testing force and deformation field distribution characteristics of the model body under the action of the static load; C, simulating actual cavern excavation characteristics, and measuring force and deformation field distribution characteristics in the model body after excavation each time; and D, drilling in the model body, mounting explosive cartridges and detonators in the drill bores, filling with loess, and detonating the explosive. By utilizing the method, the occurrence scale and time of deep roadway rock burst can be effectively predicted, damage of rock burst disasters on mine production settings can be reduced, the mine safety production risk is greatly reduced, and the production efficiency of the mine is greatly improved.

The invention discloses a method for predicting vertical well volume fractured reservoir reform volume of low permeable reservoir. The method sequentially comprises the following steps: (1) calculating the induced stress produced by hydraulic fracture in a three-dimensional space; (2) calculating the formation pore pressure obtained after leak-off of fracturing fluid; (3) calculating the formation pore elastic stress obtained after the leak-off of the fracturing fluid; (4) overlapping the stress fields obtained in the step (1), (2) and (3) with an in-situ stress field to obtain a new crustal stress field, and calculating the magnitude and direction of three-way principal effective stress in the overlapped reservoir space; (5) calculating the open fracture determination coefficient M of a natural fracture in the reservoir space and the shear fracture region determination coefficient S of the natural fracture so as to predict the volume fractured reservoir reform volume. The method is used for predicting the reservoir reform volume after vertical well volume fracturing, is better in operability and accuracy, provides a favorable theoretical basis for effect evaluation and yield prediction after vertical well volume fracturing of the low permeable reservoir, and overcomes the defects of the prior art.

The invention discloses a visual physical experimental system and a visual physical experimental method for a rock hydraulic fracturing plane problem. The visual physical experimental system comprisesa crustal stress loading and control system, a hydraulic servo pump pressure system, a crack surface observation system, and an internal deformation and stress monitoring system, wherein the crustalstress loading and control system is used for applying confining pressure to s sample to simulate reservoir crustal stress; the hydraulic servo pumping system is used for pumping fracturing fluid intothe sample; the crack surface observation system is used for monitoring and recording a crack dynamic evolution process in the fracturing process and analyzing and processing the crack evolution process; and the internal deformation and stress monitoring system is used for monitoring an induced stress evolution rule and sample deformation characteristics in the sample in the hydraulic fracture propagation process. The visual physical experimental system and the visual physical experimental method can solve the problems existing in the rock hydraulic fracturing physical experiment, and play anirreplaceable important role in discovering a new multi-cluster fracturing phenomenon and revealing the inter-fracture rock mechanical response and competition mechanism.

The invention discloses a gas coal hydrofracture field time-space monitoring device and method. The device comprises a main cavity body, a crustal stress simulation module, a gas charging and discharging module, a hydrofracture module and a resistivity testing module which are arranged on the main cavity body, wherein the crustal stress simulation module is used for simulating the stress state of a coal body under a filed condition; the gas charging and discharging module is used for charging gas into a coal body; the hydrofracture module is used for providing pressure water for the coal body; the resistivity testing module is used for testing resistivity signals in a hydrofracture process of a coal sample. A coal sample obtained at the field is put into the main cavity body of the device, and gas is charged into the main cavity body, so that the coal sample adsorbs the gas fully, and external load is applied; high-pressure salt water is injected into preset drill holes in the coal sample and the preset drill holes are fractured; meanwhile the resistivity variation in the coal sample in the process is tested; the distribution in a three-dimensional space and the time-space evolution process of a fracture of the coal body are monitored continuously by the sensitive response to the salt water by resistivity. Additionally, the device also can determine the reasonable water injection pressure of the coal sample under different conditions.

The invention relates to the field of underground coal gasification, in particular to a technology for ensuring and channeling a coal gasification tunnel. The invention provides a method and a system for ensuring and channeling the coal gasification tunnel, wherein the method comprises the following steps: measuring the crustal stress in the horizontal direction of a coal bed; ensuring the cranny developing direction of the coal bed according to the measured crustal stress in the horizontal direction; and ensuring the direction of the coal gasification tunnel according to the cranny developing direction of the coal bed. Because the cranny developing direction in the coal bed is ensured according to the crustal stress in the horizontal direction of the coal bed and the direction of the coal gasification tunnel is decided according to the cranny developing direction of the coal bed, when the coal gasification tunnel exploited along the cranny developing direction of the coal bed reaches the same permeability, the required external force is smaller so that the channeling efficiency of the gasification tunnel is improved.

The invention discloses a design method for property parameters of anti-collapse drilling fluid for fractured formations. According to sequence, the design method includes the following steps: core samples are prepared; four of the core samples are chosen for a triaxial compression test and an acoustic emission test, and the crustal stress of a formation owning the core samples is determined; two of the core samples are chosen for the triaxial compression test, and the cohesion and internal friction angle of the weak planes of the rocks are tested; eight of the core samples are chosen to be put into the drilling fluid, the triaxial compression test is carried out after the core samples are soaked for different times, and the cohesion and internal friction angle of the weak planes of the rocks are tested; the cohesion and internal friction angle of the weak planes of the rocks are respectively linearly fitted to soaking times; the fluid-solid coupling theory is utilized to create a fractured formation well surrounding rock stress distribution model; the elastic mechanics coordinate transformation theory is utilized to create a fractured formation weak plane destruction model; a relation chart between the property parameters of the drilling fluid is determined. The design method disclosed by the invention can quantitatively optimize the key property parameters of the drilling fluid according the requirement of a site for well wall stability.

The invention relates to the technical field of exploration and development of oil and gas fields, in particular to an optimal drilling trajectory prediction method of a lateral well. The method includes the steps of acquiring a rock three-dimensional dynamics parameter field through conversion of dynamic static rock dynamics; determining natural fracture systems and occurrence distribution through core palaeomagnetic orientation, imaging logging and array acoustic logging; conducting present stress field simulation utilizing the rock three-dimensional dynamics parameter field; determining development probability of fractures of different periods utilizing acoustic emission experiments to simulate ancient stress field of different periods; simulating and determining present crustal stressvertical distribution through stress field simulation of well areas; and predicting fracturing fracture spreading directions utilizing crustal stress, fractures and vertical distribution of rock dynamics to establish an equivalent extending vertical zonation model of fracturing fractures. The optimal drilling trajectory prediction method of the lateral well verifies the reliability of fracturing fracture spreading directions by combining the drilling direction of the lateral well and dynamic materials of the lateral well, and realizes direction prediction of fracturing fractures of different blocks and optimal drilling trajectory design of the lateral well.

The invention discloses a sand layer three-dimensional grouting test device capable of simulating actual working conditions, and a test method thereof. Different crustal stress conditions and different pore water pressures can be simulated according to actual grouting requirements, meanwhile soil samples with different proportions can be made according to test demands to simulate different sand layer characteristics, after grouting, the volume change amount and the axial displacement change of the soil sample in a rubber film can be observed by a volume strain measuring device and an axial displacement measuring device, images obtained before and after the grouting are compared to obtain a deformation value of the middle of the rubber film, and then reasonable grouting pressure and slurryratios under different working conditions and sand layer characteristics are researched according to the obtained volume change amount and the axial displacement change of the soil sample, and the deformation value of the middle of the rubber film, and the mechanical properties of a grouting body are also detected. In addition, a grouting tube of the test device can be changed according to the engineering and experimental needs, the simulation and research of a radial grouting process are achieved, and the mechanical effect of radial grouting is tested.

The invention discloses a volume fracturing construction parameter optimization design method for an unconventional oil and gas reservoir infill well. The optimization design method comprises the following steps: S1, establishing a three-dimensional geologic model with physical and geomechanical parameters; S2, establishing a natural fracture network model by integrating rock core-logging-seismicdata; S3, generating an old well hydraulic fracturing complex fracture based on the natural fracture model; S4, establishing a three-dimensional shale gas reservoir seepage model; s5, establishing a three-dimensional geomechanical model; s6, analyzing and calculating a dynamic crustal stress field; s7, establishing an infill well horizontal fracturing complex fracture numerical model based on theold well complex fracture and the dynamic crustal stress calculation result; and S8, optimally designing volume fracturing construction parameters of the infill well. The method has the beneficial effects that the influence of the long-term exploitation process of the shale reservoir with natural fracture development on the volume fracturing of the infill well can be accurately reflected, the fracturing construction parameters of the infill well are optimally designed, the fracturing effect is effectively improved, and the single-well productivity is increased.

The invention provides a fracturing method applicable to a thin layer. The method comprises the steps that 1) comprehensive characteristic evaluation of a reservoir and a compartment is carried out to acquire the information of the lithology, the physical property, the rock mechanics, the crustal stress and the sensibility characteristic of the reservoir and the compartment; 2) at the acid liquid pretreatment phase, acid liquid is injected into the reservoir; 3) at the pre-liquid phase, low viscosity fracturing liquid is injected into the reservoir; 4) at the sand adding phase of sand-carrying liquid, a medium viscosity fracturing liquid system mixed with a propping agent is injected into the reservoir; 5) at the replacement phase, a less replacement technology is used. According to the invention, the fracturing degree of the reservoir of the class, the effective support degree of the propping agent and the support efficiency of a long shaft crack can be improved; the post-pressing long-term diversion ability is improved; the post-pressing effect is ensured; the stable yield period is prolonged; and the fracturing reforestation effect of the reservoir of the class and the reservoir utilization are improved.

The invention discloses a refracturing well and layer selecting method based on four-dimensional crustal stress dynamic change. The method includes the steps that S1, a three-dimensional geologic model is set up; S2, a three-dimensional oil deposit model is set up, and producton / injection dynamic parameters are used for predicting a three-dimensional pore pressure field and a temperature field of different periods; S3, a three-dimensional crustal stress model is set up; S4, an initial three-dimensional crustal stress field is formed; S5, a four-dimensional dynamic crustal stress model is set up; S6, interstifial flow-stress coupling solution is carried out, and dynamic crustal stress and pore elastic parameters are analyzed and calculated; S7, a refractured well and layer position are selected preliminarily; S8, interstifial flow-stress-fracture damage coupling model of refracturing is set up; S9, the final fracturing layer segment is determined. The refracturing well and layer selecting method has the advantages of being capable of accurately reflecting the change condition of dynamic crustal stress and pore elastic parameters in the oil and gas development process, optimizing the refractured well and layer position by combining the interstifial flow-stress-fracture damage coupling model, effectively improving oil and gas recovery degree and avoiding aquifer communicating.

The invention discloses a flexible boundary load test device. The flexible boundary load test device comprises a base, a spring system and a bearing plate, wherein the front surface of the base is provided with a guide device; the spring system is arranged in the guide device; the spring system in the guide device is provided with the bearing plate, and is formed by the combination of belleville springs, and can be laminated, folded and combined to acquire the required rigidity according to the required rigidity of particular tests. The flexible boundary load test device has the advantages of high bearing capability, small required space, convenience in combining and using, rigidity variation, buffer shock absorption and the like. The belleville springs are used as force transmitting, buffering and shock absorbing and energy storage media of the test device, can timely supply energy required for surrounding rock resilience caused by excavation unloading for test models, and supply resilience rigidity for the models; the flexible boundary load test device can truly simulate the crustal stress of deep rock bodies so as to guarantee the accuracy and the authenticity of tests.

The invention relates to a system and method for tunnel water-bursting test under high crustal stress-osmotic pressure. The system comprises a main box used for simulating excavation of a tunnel model, the main box is of integrated structure and placed on a base, two opposite sides of the base are fixed on two slide rails, and an n-shaped counter-force frame is arranged between the two slide rails. The bottom ends of two support legs of the counter-force frame are fixed detachably on the slide rails. The top beam of the counter-force frame is fixedly connected with the top end of a loading system. An information monitoring element is arranged in the main box, the loading system and the information monitoring element are connected with a monitoring and controlling system. The monitoring and controlling system controls the loading system to apply crustal stress and osmotic pressure to the model material in the main box.Research on tunnel water bursting under the condition of high crustal stress-osmotic pressure engineering excavation turbulence is realized, and actual needs of the engineering are met.Further, fully automatic control of operation is realized and experiment operation is greatly facilitated.

The embodiment of the invention discloses a method and device for analyzing oil-string casing failure and belongs to the technical field of well completion engineering safety of unconventional oil and gas resource exploitation.The method comprises the steps that geological parameters and engineering parameters of stratums of different depths within a preset range at the position where a target oil and gas well is located are obtained, information of a high-risk area of an oil-string casing of the oil and gas well is determined according to the geological parameters and the engineering parameters, dynamic crustal-stress change and rock stratum deformation situation in the fracturing process of the stratum where the high-risk area of the oil-string casing is located are obtained according to the geological parameters, the engineering parameters and the information of the high-risk area of the oil-string casing of the oil and gas well, and the deformation occurrence of the oil-string casing is determined based on the obtained dynamic crustal-stress change and the obtained rock stratum deformation situation.By the adoption of the method and the device for analyzing the oil-string casing failure, the accuracy of analysis conducted on the oil-string casing failure under large-scale segmented volume fracturing conditions can be improved.

The invention discloses a simulation experiment set for thickened oil thermal recovery storage layer fractures, and belongs to the field of thickened oil thermal recovery development. The simulation experiment set provides an experiment basis for the theoretical study on thickened oil thermal recovery development schemes and engineering design optimization. The simulation experiment set comprises experiment rock samples, a vacuum tri-axial stress loading device, a temperature loading controlling device and a sound launching monitoring device. The experiment rock samples are cuboid and comprise an actual oil deposit coring and cement mortar wrapper. The experiment rock samples reflect the rock mechanical property of actual oil deposition more truly. The temperature loading controlling device carries out local heating through heating pipes and transmits the heat to the experiment rock samples through a heat-transfer medium, the actual high-temperature thermal process is simulated, and a temperature collecting and controlling instrument collects and controls the temperature of the experiment rock samples. The simulation experiment set simulates the combined stress state of the thickened oil thermal recovery process under the different temperature and crustal stress conditions, and actual and effective evaluations on the fractures of thickened oil thermal recovery storage layers can be made.

The invention relates to a method for modifying and optimizing fractured an oil and gas reservoir infilled well in a fractured oil and gas reservoir production process. The method comprises the following steps: S1, establishing a three-dimensional geological grid attribute model; S2, establishing a natural fracture grid attribute model; S3, establishing a hydraulic fracturing simulation model; S4,establishing a three-dimensional oil and gas reservoir numerical simulation model, and calculating a reservoir pore pressure field and a temperature field in production and injection processes; S5, establishing a three-dimensional crustal stress model suitable for mechanical calculation; S6, generating an initial three-dimensional crustal stress field; S7, establishing a four-dimensional dynamiccrustal stress model; S8, solving the seepage-stress coupling model; and S9, optimizing reservoir transformation process parametersd. The method has the beneficial effects that the change of crustal stress and pore elastic parameters in the fracturing well reservoir development process can be effectively reflected according to the characteristics of fractured oil and gas reservoirs, and guidance is provided for arrangement of the infilled well and optimization of a fracturing transformation scheme.