24 results about "Fracture geometry" patented technology

The invention discloses a drilling-measurement constrained three-dimensional geothermal geologic attribute modeling and quantification method, and relates to the technical field of data analysis and processing, and the method comprises the following steps: 1, constructing a drilling-measurement constrained three-dimensional geothermal geologic voxel basic model, and forming a three-dimensional geothermal geologic voxel basic model covering a modeling range; 2, constructing an implicit signed distance field on the three-dimensional geothermal geologic voxel basic model to express fracture geometry, generating a unified implicit geothermal geologic voxel field, and redividing voxel categories according to the unified implicit geothermal geologic voxel field; and step 3, executing moving cube surface reconstruction and prior sensitivity analysis on the unified implicit geothermal geologic voxel field to give a space confidence body and a volume interval, and dividing the space confidence body and calculating the volume interval according to the voxel occurrence frequency. Evaluation of the geothermal body is changed from traditional single volume estimation to interval and confidence expression, and a reliable basis is provided for well position deployment, risk management and development planning.

A method for determining hydraulic fractures in the near-wellbore region, comprising the following steps: constructing a model with hydraulic fractures, a wellbore, and a formation as main components, and discretizing the model using non-uniform grid technology. This data subset is inverted using the time-lapse full-waveform inversion (TL-FWI) algorithm to achieve high-precision reconstruction of the hydraulic fractures and to obtain key attributes such as fracture-wellbore connectivity, extent of fracture propagation, and fracture geometry.

The application discloses a hydraulic fracturing fracture monitoring method and device based on Krauklis wave full waveform inversion, and comprises the following steps: obtaining a forward data set containing Krauklis wave and an actual data set of Krauklis wave; using full waveform inversion to invert the hydraulic fracturing fracture; periodically using full waveform inversion to image the fracturing fracture and periodically monitoring the hydraulic fracturing fracture. The application fully utilizes the relationship between the waveform characteristics of Krauklis wave, such as propagation along the fluid layer in the fracture, strong amplitude, strong frequency dispersion and low frequency propagation speed, and the fracture geometry, is based on the numerical solution of the elastic wave equation, adopts full wave field information, and thus provides a high-resolution and high-precision fracture fine structure image, so as to serve quantitative fracturing monitoring and fracture effect evaluation.

The present invention discloses a proppant injection method based on particle size distribution optimization, comprising: comprehensively analyzing the geometric parameters of the fracture, the property parameters of the rock, and the pressure parameters that change in real time during the fracturing process, and determining the proppant particle size distribution range corresponding to different areas of the fracture through a data analysis model and algorithm; dividing the proppant particle size distribution range into a plurality of particle size adaptation intervals according to the width measurement values ​​and permeability test results of different areas of the fracture; during the proppant injection process, using downhole sensors to perform real-time data monitoring, and judging the areas in the fracture where proppant injection and distribution abnormalities exist based on the real-time data analysis, and performing dynamic particle size adjustment. The present invention solves the problem of uneven distribution of traditional proppant injection methods in complex underground environments. By constructing a multi-factor analysis model, key factors such as fracture geometry, rock properties, and fracturing pressure are accurately controlled to achieve refined regulation of proppant particle size distribution.

An improved fracking efficiency evaluation system and method of use is described. Embodiments of the system can be implemented to generate a completion design plan based on quantitative analysis of fracture geometries including observed and unobserved fractures in a treatment well. One or more metrics based on a statistical distribution of fracture geometries of an entire treatment well including each stage can be used to generate a completion design plan for optimizing performance of a treatment well.

The invention discloses a loose sandstone reservoir fracturing filling double-particle-size proppant combination mode and a selection method. The selection method comprises the following steps that S1, reservoir geological parameters, production condition parameters and fracture geometric parameters are obtained, so that the flow rule and the flow mode of reservoir fluid in a reservoir-fracture dual-medium system are judged, and the key invasion blocking part of stratum sand to a fracture is judged according to the flow mode; s2, according to the flow mode determined in the step S1 and the key invasion and blockage part of the stratum sand to the crack, any one of the following dual-particle-size proppant combination modes (1)-(3) is selected: (1) the combination mode with the thick outer part and the thin inner part; 2) a thin-outside and thick-inside combined mode; and 3) a coarse and fine mixing combination mode. According to different reservoir conditions and fracture geometric dimensions, a corresponding and reasonable double-particle-size proppant combination mode can be quickly and conveniently selected, the problem of adaptability evaluation of different-particle-size combination modes on reservoirs and oil wells is solved, and it can be ensured that a novel combined filling mode can play potential and functions.

The embodiment of the invention discloses a sand adding parameter determining method and device for fracturing operation, equipment and a medium. The method comprises the steps that the sand adding concentration, the sand adding amount and the sand adding sequence serve as variables, and according to the target proppant settling velocity and the geometric morphology of a crack, based on at least two candidate sand adding processes, the geometric morphology of a sand bank, the sand paving efficiency and the pressure at a crack inlet are preliminarily simulated; a target sand adding process is selected from the candidate sand adding processes according to the preliminary simulation result, and path information and crack width information of a target propping agent before the target propping agent enters the crack are increased for secondary simulation; and determining different sand adding concentrations, sand adding amounts, sand adding sequences, fracture geometrical shapes, and a function relationship between the target sand paving efficiency and the target effective fracture length, and determining sand adding parameters according to the function relationship. According to the scheme, the distribution and flow characteristics of the propping agent can be effectively controlled, the length of an effective supporting seam is increased, and the overall efficiency of fracturing operation is improved.

The invention discloses an arc-shaped triangular block stability mechanical analysis model for hard roof gob-side entry driving, and particularly relates to the technical field of coal mine roadway support stability analysis and computer aided design. The method is used for solving the problem that an existing analysis method does not consider goaf gangue compaction real-time variable characteristics and a roof rotary motion dynamic coupling effect, and consequently the roof stability judgment precision is insufficient. According to the model, by establishing a gangue compression amount time-varying equation and a roof fracture geometric parameter calculation model, the dynamic coupling relation between gangue supporting force and arc-shaped triangular block rotation motion is analyzed, the interaction coefficient and the influence weight of the interaction coefficient on stability are quantified, a dynamic balance equation containing the time-varying supporting effect is constructed to solve a stability criterion, and the stability of a roof is improved. Outputting a stability analysis result required by the support design based on the criterion; accurate evaluation of the dynamic stable state of the top plate and optimal design of supporting parameters are achieved.

This invention provides a method for diagnosing fracturing fracture parameters by combining adjacent well fiber optic strain and construction pressure. The method includes: deploying distributed fiber optic sensors in the adjacent wellbore to monitor strain signals; deploying pressure sensors in the fracturing well to monitor pressure changes; comparing and processing fiber optic strain data and pressure data on the same time axis to identify the correlation between pressure fluctuations and fiber optic strain, and identifying the strain signal at the fracture front; establishing a strain-fracture geometry parameter inversion model by combining fiber optic strain and pressure fluctuations to obtain fracture geometry parameters at different times; verifying the accuracy of the strain-fracture geometry parameter inversion model; substituting the fracture parameters obtained from the strain-fracture geometry parameter inversion model into the Barree conductivity model to obtain the fracture conductivity; and obtaining the three-dimensional geometric morphology and dynamic change process of the fracture based on the obtained fracture geometry parameters and fracture conductivity. This invention can obtain more accurate fracture parameters.

The application discloses a joint wellbore casing deformation-acoustic emission b-value fracture activation condition multidimensional judgment method, which comprises the following steps: based on casing deformation analysis, preliminarily statistically controlling law of fracture own properties on fracture activation, obtaining acoustic emission b-value of experimental scale critical activation point, and constructing a fracture activation condition judgment method combining casing deformation analysis and acoustic emission b-value; the application considers the influence law of multiple properties of the fracture itself on casing deformation intensity, combines wellbore casing deformation information with acoustic emission sequence b-value of the experimental scale critical activation point, and extrapolates the experimental results to geological conditions by taking the underground statistical law as a constraint, thereby solving the problem that the laboratory test results are too idealized, simultaneously considering the multi-solution of the actual geological engineering data, and realizing quantitative characterization of the fracture activation, which greatly improves the accuracy and applicability of the activation condition prediction in theory and method, and meanwhile, the wellbore casing deformation information and fracture geometric data are easy to obtain, and the application range is wide.

A method to estimate and model all or at least two parameters of hydraulic fracture geometry in predominantly horizontal or nearly horizontal wells, by use of inter-well electromagnetic recordings. In aspects, resistivity of the fracturing fluid is used in the modeling process.

The invention discloses a hydraulic fracture geometric parameter nonlinear inversion method, which comprises the following steps: establishing a strain analysis model according to preset mechanical parameters; according to the established strain analysis model and axial strain observation data acquired by a low-frequency DAS system in an adjacent well monitoring scene, establishing a crack parameter nonlinear inversion model; solving global optimal inversion by adopting a nonlinear least square iteration algorithm according to a preset constraint condition and the fracture parameter nonlinear inversion model, and performing inversion to obtain fracture height, fracture height asymmetric offset and net pressure; and calculating the maximum seam width according to the obtained seam height and net pressure.

The invention discloses an artificial fracture rock core holder and a use method, and belongs to the technical field of artificial rock cores. Comprising an outer cylinder body, a front end cap arranged at the front end of the outer cylinder body, a rear end cap arranged at the rear end of the outer cylinder body, a flexible connecting piece arranged between the front end cap and the rear end cap, and a rock core cavity arranged in the flexible connecting piece and used for forming a fracture rock core. According to the artificial fracture core holder and the use method, the following two types of artificial simulation methods are adopted: 1, the dynamic compaction process of a fracture under the action of stratum stress is ignored, and the natural arrangement and embedding state of proppant particles after being stressed in a real fracture cannot be reproduced; and secondly, although the geometrical shape of the crack can be controlled, the surface of the kerf is smooth, the roughness and contact characteristics of the real crack are lacked, and confining pressure cannot be applied to simulate an underground three-dimensional stress environment.

The application discloses a hydraulic fracture geometric parameter nonlinear inversion method, which comprises the following steps: a strain analytical model is established according to preset mechanical parameters; a fracture parameter nonlinear inversion model is established according to the established strain analytical model and axial strain observation data obtained by a low-frequency DAS system under a neighboring well monitoring scene; a global optimal inversion is solved by using a nonlinear least square iteration algorithm according to preset constraint conditions and the fracture parameter nonlinear inversion model, and a fracture height, a fracture height asymmetric offset and a net pressure are obtained by inversion; and a maximum fracture width is calculated according to the obtained fracture height and net pressure.

The present application belongs to the technical field of oil reservoir development, and relates to a method for calculating the permeability of a shale oil volume fracturing reconstruction space. The method comprises the following steps: step 1, drawing a curve of daily oil production and production time in a logarithmic coordinate system to identify the flow mode of shale oil in different production stages; step 2, calculating the production time of shale oil in different flow stages; step 3, using microseismic monitoring data to identify the fracture geometry after volume fracturing; step 4, calculating the intersegment distance between fracturing segments of different volume fracturing geometries; and step 5, calculating the permeability of the volume fracturing reconstruction space. The method realizes accurate calculation of the permeability of a shale oil volume fracturing reconstruction space, improves the understanding of fracturing and reservoir properties, objectively and accurately evaluates the fracturing effect, provides a basis for evaluation of the flow capacity of a complex space after shale oil volume fracturing reconstruction, and fills the gap in the prior art.

The invention discloses a multi-cluster fracture propagation and proppant migration simulation method considering eyelet erosion. The method comprises the steps that parameters are set, a hydraulic fracturing geometric model is established, and the initial pressure fracture width is set; determining a current time step length; solving an eyelet erosion equation, an eyelet pressure drop equation, an in-seam fluid flow equation and a rock elastic deformation equation when the sand-carrying fluid is started to be pumped; solving a proppant migration equation when the sand-carrying fluid starts to be pumped at the current moment; updating the front edge and the elastic matrix of the crack of each cluster when the tip of the crack of each cluster reaches the critical expansion condition; and when the current moment reaches the total pumping time, ending calculation, and outputting a time-varying diagram of the hole diameter and the hole shape coefficient, a three-dimensional expansion form of each cluster of cracks and an in-crack propping agent distribution cloud diagram. According to the scheme, the expansion form of the multi-cluster fracture and the concentration distribution of the propping agent in the horizontal well segmented multi-cluster fracturing can be evaluated more accurately, and the unconventional oil and gas well fracturing parameter design is guided.

This invention discloses an integrated parallel plate experimental device and method for proppant placement and recirculation with variable morphology. The experimental device includes: a fracturing fluid input system, a recirculation gas-liquid supply system, a variable morphology parallel plate fracture simulation device, and a data acquisition system. The variable morphology parallel plate fracture simulation device has a placement end and a recirculation end. A branch path is provided on the side of the recirculation end. The variable morphology parallel plate fracture simulation device can achieve continuous adjustment of the fracture width, used to construct fracture geometries with different fracture lengths and heights, and can switch the path between proppant placement and recirculation tests. During the recirculation stage, the variable morphology parallel plate fracture simulation device can be used to simulate multi-directional inflow and gas-liquid coexistence conditions. This application can systematically study the placement behavior and recirculation characteristics of proppant and fiber-proppant systems under different fracture morphology conditions.

The invention discloses a fractured shale reservoir fluid injection fracture activation process simulation method, which belongs to the technical field of unconventional oil and gas exploitation, and comprises the following steps: inputting a multi-scale fracture in-situ parameter characteristic data set into an inversion model, and performing inversion on multi-scale fracture in-situ characteristic parameters to obtain an inversion result; constructing a three-dimensional multi-scale fracture geometric model; an inversion result is fused into a geometric model, and a three-dimensional multi-scale discrete fracture network model is constructed; based on the shale macroscopic rock mechanical parameter distribution function, constructing a macroscopic heterogeneous shale reservoir matrix model; embedding the three-dimensional multi-scale discrete fracture network model into the macroscopic heterogeneous shale reservoir matrix model to form a shale reservoir model; according to the shale reservoir model, a fractured shale reservoir fluid injection fracture activation model is constructed, and the fracture activation slippage process is subjected to simulation characterization. The fracture activation process numerical model constructed by the method can accurately describe the dynamic evolution process of the fracture from a stable state to instability activation.

The application discloses a kind of based on microseismic space-time clustering's fracturing effect evaluation method and system, belong to hydraulic fracturing technical field, the present application is by introducing the connectivity between fracture cluster, comprehensively consider the spatial distance between fracture, time sequence evolution and energy characteristics, construct the quantization index that can reflect the connection strength of fracture;It also abstracts the relationship between fracture cluster as weighted fracture network diagram, so as to identify the potential through path from the crack region cluster set to target region cluster set, the overall fracture connectivity is obtained by calculating the path connectivity of each connected path, finally based on overall fracture connectivity, the accuracy, reliability and engineering practicability of evaluation result are significantly improved by objectively, quantitatively grading evaluation of fracturing effect.Solved in the evaluation of fracturing effect, unable to consider the time sequence of microseismic event, unable to identify fracture geometry and unable to realize the quantitative evaluation of the whole fracture network fracturing effect problem.

An improved fracking efficiency evaluation system and method of the system can be implemented to generate a completion design plan based on quantitative analysis of fracture geometries including observed and unobserved fractures in a treatment well. One or more metrics based on a statistical distribution of fracture geometries of an entire treatment well including each stage can be used to generate a completion design plan for optimizing performance of a treatment well.

The invention relates to the field of exploration and development of oil and gas reservoirs, and discloses a strike-slip fault zone source capacity evaluation method and device, a storage medium and a processor. Determining a key interface corresponding to the key period of fracture development and a target series of strata affecting vertical migration of oil gas through the fracture zone, and then obtaining a series of strata interface coherence map; overlapping the strata series interface coherence map and the drilled well distribution map, determining target wells distributed on the strike-slip fault zone, and acquiring production data of each target well; based on each over-fault zone profile passing through each target well, determining fracture geometric parameters corresponding to each over-fault zone profile; and performing quantitative evaluation on the source capacity of the strike-slip fault zone based on the incidence relation between the production data and the fracture geometric parameters. Based on the scheme, the incidence relation is established between the production data and the fracture geometric parameters, and quantitative evaluation of the strike-slip fracture zone source passing capacity can be achieved.

This specification relates to the field of hydraulic fracturing technology for oil and gas reservoirs, and more particularly to a method and apparatus for simulating fracture propagation. The method includes: discretizing a fracture domain containing fractures; determining the fracture width of discrete elements in the fracture domain using Newton's method iteratively based on an analytical expression of a fracture width function and a Jacobian matrix, wherein the fracture width function is obtained by embedding the fracture pressure equation into the fluid flow equation; calculating the tip stress intensity based on the fracture width of the discrete elements at the leading edge of the fracture domain; activating adjacent discrete elements in the fracture tip extension direction if the tip stress intensity satisfies the fracture propagation condition; and updating the fracture geometry in the fracture domain based on the activated adjacent discrete elements. The embodiments in this specification can improve the simulation accuracy and computational efficiency of fracture propagation simulation.

The present invention discloses a method for obtaining a high-confidence critical cracking load of a rock mass under compression and shear. Based on the actual stress state of a rock mass with compression and shear fractures and the stress boundary conditions of the rock mass fracture surface, and compatible with the multi-dimensional parameter attributes of the rock mass fractures and the stress component combination at the rock mass fracture tips, a data characterization method for the critical cracking load of a rock mass under compression and shear is obtained, which can provide basic value data for rock mass engineering design and its operation and construction. The present invention combines the compression and shear stress characteristics of fractured rock masses, starting from the stress boundary conditions of the fracture surface, and uses a complex variable function method to conduct an in-depth analysis of the stress field distribution of the compression and shear fractured rock mass. It also considers three types of parameters: fracture geometry, strength, and deformation. This method can more accurately predict the critical cracking load of a fractured rock mass, and has important theoretical and application value for various rock mass compression and shear fracture mechanics application scenarios such as tunnels, underground chambers, mining, slopes, and dam foundations.

The application discloses a kind of joint hole medium wellbore-fracture-cave coupling fracturing simulation method and system, method includes: constructing simulation model and discretization obtains rock matrix, fracture, wellbore and cave unit;Based on the solution of thermal-fluid-solid coupling mathematical model obtains main variable field and stress boundary condition;Based on the solution of induced stress calculation model obtains wellbore-fracture-cave joint induced stress field and fracture physical property parameter;Through iterative convergence judgment updates thermal-fluid-solid coupling parameter;According to joint induced stress field, fracture propagation criterion is judged and fracture geometry is updated;The application realizes the collaborative simulation of thermal-fluid-solid multi-field coupling and fracture dynamic expansion, can accurately track the expansion track of three-dimensional fracture in joint hole medium, provides reliable prediction means for joint hole oil and gas reservoir fracturing, geothermal development and underground engineering stability analysis.