39 results about "Tortuosity" patented technology

The embodiment of the invention provides a core permeability prediction method, electronic equipment and a storage medium. According to the method, a digital rock core model of a sample rock core is constructed, pore structure parameters of the digital rock core model are calculated, and the pore structure parameters comprise porosity, the ratio of the minimum pore throat diameter to the maximum pore throat diameter, fractal dimensions, the specific area value and tortuosity; and inputting the porosity, the pore throat diameter distribution parameter, the fractal dimension, the specific area value and the tortuosity of the digital core model into a permeability calculation model to obtain a permeability prediction value of the digital core. According to the method, when the permeability of the core is calculated, multi-scale parameters such as fractal dimensions are introduced, and the pore characteristics of a complex reservoir are fully described, so that the influence of the pore structure of the sample core on the seepage is more accurately represented, and the prediction precision of the permeability is improved.

This invention discloses a method for calculating the tortuosity of coal-uranium reservoirs based on the maximum inscribed circle and symmetry constraints, comprising the following steps: acquiring a three-dimensional binary image of the internal structure of the coal-uranium reservoir; extracting inlet and outlet end face slices respectively, and marking the pore connectivity domains in each slice; for each pore connectivity domain, determining the center and radius of the maximum inscribed circle through Euclidean distance transformation, and filling the maximum inscribed circle in descending order of radius; setting a radius threshold, and determining the center of the filled circle that satisfies the threshold as the channel endpoint; applying the same connectivity domain marking rules, filling rules, radius threshold, and non-overlapping constraints to the inlet and outlet end faces to obtain the set of starting points and the set of ending points; searching for the optimal connectivity path from each starting point to each ending point in the three-dimensional pore space, and recording the actual length of each path; calculating the tortuosity based on the actual length of each path and the seepage length, and thus obtaining the overall tortuosity.

The invention relates to the technical field of oil and gas reservoir development, and discloses a core micro-CT image pore structure intelligent analysis method and system, and the method comprises the steps: obtaining core micro-CT scanning three-dimensional image data; noise filtering, gray correction and artifact removal preprocessing are carried out; a three-dimensional deep learning semantic segmentation network comprising a mixed attention module is adopted to identify pores, throats and skeletons; extracting a pore network model by adopting a maximum ball algorithm in combination with an adaptive pore throat segmentation factor; calculating structure parameters such as porosity, coordination number, tortuosity and the like; analyzing connectivity and seepage channel characteristics; performing multi-displacement mode two-phase flow simulation to predict displacement efficiency; according to the method, the end-to-end intelligent analysis is realized, and the pore segmentation precision and the displacement efficiency prediction reliability are improved.

The invention discloses a reservoir porosity real-time prediction method and system based on alkane gas curvature and a storage medium, relates to the technical field of oil and gas reservoir development, and aims to solve the problems of insufficient utilization of dynamic characteristics of alkane gas curvature, poor real-time performance and limited heterogeneous reservoir modeling capability of an existing method. According to the technical key points, the method comprises the following steps: S100, acquiring alkane gas concentration and carbon isotope ratio data in a drilling process in real time, and calculating a curvature characteristic of the alkane gas concentration; s200, performing dynamic feature extraction on the alkane gas curvature; s300, performing dynamic weighted feature fusion on the curvature dynamic feature and the carbon isotope ratio to obtain fusion data; s400, constructing a BiLSTM model, training the BiLSTM model based on the fusion data, generating a hidden state, introducing an attention mechanism to perform dynamic weighting, and combining with an adjacent matrix of a reservoir geological unit to realize space enhancement; and S500, on the basis of the BiLSTM model, in combination with physical constraints, performing real-time prediction on the porosity of the reservoir.

The invention discloses a flash evaporation material with good tortuosity and a preparation method thereof, and belongs to the technical field of flash evaporation spinning, the flash evaporation material is prepared from polyethylene, the tortuosity is 2.5-25, and the permeability is 85-11800 mdarcy. The flash evaporation material provided by the invention has proper tortuosity, permeability, Gurley air permeability and hydrostatic pressure, and has a good application prospect.

The application discloses a kind of soil solidifying agent solidification performance test analysis method, it is related to soil solidifying agent solidification performance test field, comprising: the present application obtains load-displacement curve and micro video stream in quasi-static loading process, and the load value and corresponding time stamp of characteristic inflection point in load-displacement curve are extracted, which represent crack initiation, stable expansion and unstable expansion feature;Identify the pixel coordinates of crack initiation point, and the pixel coordinates of crack initiation point are matched with the position of pore, interface defect in background structure feature map in space, to judge the defect type that crack initiation originates from;By obtaining the crack path from crack initiation point to unstable expansion, the tortuosity and branch number are extracted, combined with crack tip strain field concentration degree and crack origin type under different loading stages, the dominant cause leading to sample failure is analyzed, the collaborative analysis of loading mechanical behavior and micro deformation evolution is realized, and the failure mechanism of solidified soil can be identified.

Disclosed herein is a method for identifying a high producibility zone in a shale reservoir. The method includes obtaining a total organic carbon (TOC) content and an organic sulfur content of a formation interval using geochemical measurements and determining a dielectric dispersion response of the formation interval using dielectric measurements. The dielectric dispersion response is processed to obtain an aperture system tortuosity parameter. The pore system tortuosity parameter correlates to a ratio of organic sulfur content to TOC content to identify the presence of a mature kerogen zone with high or low hydrocarbon producibility, an immature kerogen zone in which clay is present, and a non-producible or over-mature zone within a formation interval. The correlation is performed by comparing the ratio of organic sulfur content to TOC to an organic matter maturity threshold and comparing the pore system tortuosity parameter to a pore system tortuosity parameter threshold.

The invention discloses a soil stabilizer curing performance test analysis method, and relates to the field of soil stabilizer curing performance tests.The method comprises the steps that a load-displacement curve and a microscopic video stream in the quasi-static loading process are obtained; load values representing crack initiation, stable propagation and unstable propagation characteristic inflection points and corresponding timestamps in the load-displacement curve are extracted; identifying a pixel coordinate of the crack initiation point, performing spatial matching on the pixel coordinate of the crack initiation point and positions of pores and interface defects in the background structure feature map, and judging a defect type from which the crack initiation point originates; the method comprises the following steps: acquiring a crack path from a crack initiation point to instability propagation, extracting tortuosity and the number of branches, combining the strain field concentration degree of a crack tip and a crack origin type at different loading stages, analyzing leading reasons causing sample damage, and realizing collaborative analysis of loading mechanical behaviors and microscopic deformation evolution. And the destroy mechanism of the solidified soil can be identified.

The application discloses a method for rapidly evaluating the risk degree of invisible cold cracks of high-strength steel welds, and belongs to the field of weld cold crack detection and analysis. A high-decibel crack propagation signal emitted by a weld of a test piece is acquired, and a corresponding weld cross-section crack macro-micro image is acquired; an energy count value and a rising time value of the high-decibel crack propagation signal are extracted and normalized, and the cold crack tortuosity and the fracture facet area of the selected weld cross-section position are counted and selected; the energy proportion value of a D3 frequency band reflecting the cold crack characteristics is determined; a quantitative relationship between the weld cross-section crack tortuosity and the energy count, and a quantitative relationship between the weld cross-section fracture facet area proportion and the D3 frequency band energy proportion are established; and the risk degree of the weld crack of the high-strength steel structure to be measured can be determined by using the relationship formula. The method is simple in steps and can rapidly evaluate the risk degree of invisible cold cracks of high-strength steel welds.

The invention provides a starry sky foam copper foil foaming equipment monitoring method and device, and the method comprises the steps: obtaining bubble fracture characteristic data from sound wave signals and temperature field data, and constructing an initial monitoring data set; extracting a frequency peak value and a temperature gradient change according to the bubble rupture related characteristics, and evaluating the tortuosity degree of a gas escape path; through deviation degree analysis of the tortuosity degree of the gas escape path and a preset threshold value, the local tearing risk is evaluated, and a risk area positioning coordinate is determined; adjusting a three-dimensional cladding integrity judgment threshold value according to the risk area positioning coordinates; evaluating the potential reduction degree of the node connection density by adopting the adjusted three-dimensional coating integrity judgment threshold value to obtain a correction value of density stability control; and generating a node connection density stable control signal.

The application discloses a kind of laminated shale inherent anisotropy rock physics modeling methods, the modeling method includes: step S1: the physical property and elastic parameter of rock are collected, and scale of simulation is defined;Step S2: according to the number of laminated strip and average tortuosity, generate laminated layer with different tortuosity;Step S3: the probability distribution value of each laminated layer different inclination range is calculated using statistical probability method;Step S4: the equivalent elastic modulus of each laminated layer is calculated;Step S5: the elastic stiffness coefficient matrix of laminated mixture is calculated;Step S6: the elastic stiffness coefficient matrix of laminated shale is calculated, and longitudinal wave velocity and anisotropy parameter are calculated;Step S7: to laminated shale inherent anisotropy rock physics simulation.The VTI property of shale background matrix and laminated mixture is combined, and the rock physics simulation of laminated shale inherent anisotropy is more accurate and more reliable.

The present application provides a kind of oil shale pyrolysis reaction analysis method and system, it is related to oil shale pyrolysis simulation technical field, the present application is first based on the fractal porous medium transport theory calculation fractal tortuosity factor, to accurately depict micro-pore structure;Using weighted least squares inversion first-order reaction parameter vector, guarantee the accuracy of kinetic parameters;Combined with semi-coke cumulative mass to construct dynamic permeability model, quantifies the pore blockage effect caused by solid deposition;Established with heavy oil residence time as the core secondary cracking rate model, restores the secondary loss process of heavy oil in low-permeability environment;Using explicit time step algorithm step by step to solve mass conservation equation, realize heat-flow-hydrolysis multi-field coupling and the fidelity simulation of component evolution;Finally, based on product deterioration index determines the optimal fracturing time, provides scientific engineering decision basis for in-situ exploitation, reduces resource waste.

This invention discloses a multi-parameter statistical matching rhizosphere soil microfluidic chip device and its construction method, belonging to the field of soil microfluidics and porous media visualization technology. The device includes a glass slide, a PDMS chip layer, a fluid inlet, an outlet, a branch-shaped flow distribution zone, a buffer zone, and a soil pore simulation zone, forming a heterogeneous pore network within the simulation zone. Based on real rhizosphere soil CT images, the method extracts pore diameter, pore throat width, porosity, tortuosity, and Euler number. A network skeleton is generated using a random seed lattice and polygon segmentation, combined with probability density sampling and iterative optimization, to match the chip to real soil in terms of pore / throat size distribution, porosity, tortuosity, and connectivity. Results show that the KS distances for pore diameter and pore throat width distributions are 0.0142 and 0.0010, respectively, and the porosity is approximately 0.15. This provides a visualization platform for studying gas migration and micro-seepage in rhizosphere soil.

This invention discloses a method for evaluating and optimizing fracturing in deep shale fractured reservoirs based on multidimensional tortuosity, belonging to the field of unconventional oil and gas development and hydraulic fracturing engineering. Based on reservoir geological and construction parameters, this method constructs a fluid-structure interaction numerical model to simulate fracture propagation and stress evolution during fracturing. By identifying the failure modes of tensile and shear fractures, it extracts fracture path length and dynamic aperture, establishing an effective tortuosity evaluation model incorporating fluid dynamics weights. Furthermore, it introduces factors such as fracture zone approach angle and rock cohesion to construct a comprehensive fracture network complexity index including a geological penalty term. With the goal of increasing reservoir stimulation volume and reducing fracture zone blocking effect, it optimizes the fracturing flow rate and fracturing fluid viscosity. This method overcomes the shortcomings of traditional geometric indices in reflecting conductivity, achieving quantitative evaluation of fracture network complexity and closed-loop optimization of fracturing parameters, and has strong engineering applicability.

The application belongs to the field of concrete durability, and provides a gradient repair method and structure based on optimization of repair interface transition zone pore structure, wherein the gradient repair method based on optimization of repair interface transition zone pore structure comprises sequentially pouring first gradient repair material and second gradient repair material on the surface of existing concrete to be repaired; the first gradient repair material and the second gradient repair material are subjected to flow state fusion treatment to form interface tortuosity of the first gradient repair material and the second gradient repair material, and mechanical interlocking of the interface is realized; the first gradient repair material and the second gradient repair material after the flow state fusion treatment are once solidified and molded to obtain a repaired concrete structure. The application can realize low porosity of the interface, increase the bonding area of the repair material and the existing concrete, repair the surface without roughness treatment, and significantly improve the bonding performance of the repair interface, thereby guaranteeing full play of the performance of the repair material.

This invention relates to the field of automatic control technology, and more particularly to an AI-based prefabricated data center cooling control method and system. The method includes the following steps: acquiring a texture map and a depth map of the rack under test; analyzing the material information of the texture map to determine the theoretical heat capacity benchmark of the equipment and the geometric features of the depth map to determine the equivalent volumetric heat capacity of the rack under test; calculating the tortuosity index of the rack under test based on the spatial gradient features of the depth map to characterize heat exchange efficiency; constructing a feedforward cooling power curve by combining the equivalent volumetric heat capacity, the tortuosity index, the geometric volume of the rack under test, and the initial heat dissipation temperature difference; and controlling the operation of a precision air conditioning unit based on this curve. This invention, through intelligent perception of the appearance of the rack under test, predicts its actual heat load and heat dissipation characteristics, realizing a shift from passive feedback to active feedforward temperature control mode, improving temperature control accuracy and operating efficiency.

The application discloses a flash evaporation material with better tortuosity and a preparation method thereof, and belongs to the technical field of flash evaporation spinning. The preparation raw material of the flash evaporation material comprises polyethylene, the tortuosity is 2.5-25, and the permeability is 85-11800 mdarcy. The flash evaporation material provided by the application has suitable tortuosity, permeability, Gurley air permeability and hydrostatic pressure, and has a good application prospect.

The invention discloses a multi-scale evaluation method for the sealing performance of a beam type pipeline connection structure, which is characterized in that when the leakage rate of a microcosmic channel of a sealing interface is calculated, the effective porosity, permeability and tortuosity of the sealing interface are accurately analyzed and calculated by utilizing a porous medium theory. In the calculation of the leakage rate, microstructure characteristics are considered, a three-dimensional percolation grid model is established, tortuosity and permeability are calculated, the effective porosity and the flowing condition of fluid on a sealing interface are fully considered, and the contact stress when the leakage rate is zero serves as the critical contact stress. Meanwhile, finite element analysis is conducted on the beam type pipe joint, a stress distribution function of the beam type pipe joint is extracted, macroscopic contact bandwidth and contact stress are included, and macroscopic contact characteristics are fully considered; and when the sealing index is obtained, the two can be comprehensively considered and calculated, so that the accuracy and the reliability of sealing performance evaluation are improved. And an accurate and quantifiable evaluation criterion is provided for design and optimization of the beam type pipe joint.

This disclosure relates to the field of digital rock physics, and particularly to a method and apparatus for adjusting the tortuosity of the pore space in a digital core sample. The method includes: acquiring a digital core model of the core sample and a pre-constructed tortuosity adjustment model; wherein the tortuosity adjustment model is an inverse mapping based on the wave principle; and using the tortuosity adjustment model to adjust the tortuosity of the pore space in the digital core model to construct an extended digital core model of the core sample.

The application provides a polymer dispersion quality detection method and system based on electrical impedance spectroscopy analysis, which comprises the following steps: first, injecting the polymer dispersion to be detected into a microfluidic test environment, collecting complex impedance data while applying a thermal cycle excitation, and calculating the characteristic area of the temperature-impedance phase angle closed track curve. Combining the characteristic area with the basic conductivity, the tortuosity coefficient representing the entanglement state of the polymer chain is calculated using the porous medium permeation model. Impedance scanning is performed at a constant temperature, and the non-linear fluctuation characteristics of the electrochemical group time delay curve are analyzed to quantitatively obtain the micro-mediamedia non-uniformity degree representing the dispersion uniformity. The dispersion is graded in quality by combining the tortuosity coefficient and the micro-mediamedia non-uniformity degree. The application has the effect of accurately detecting the microstructure state of the polymer liquid.

The invention discloses a method for rapidly evaluating the danger degree of invisible cold cracks of a high-strength steel weld joint, and belongs to the field of weld joint cold crack detection and analysis. Acquiring a high-decibel crack propagation signal sent by a test piece welding seam and a corresponding welding seam section crack macro-micro image; extracting an energy count value and a rise time value of the high-decibel crack propagation signal, performing normalization processing, and counting a cold crack tortuosity degree and a fracture small plane area of the selected welding seam section position; determining the energy ratio of the D3 frequency band reflecting the cold crack characteristics; establishing a quantitative relationship between the bending degree of the weld section crack and the energy count, and a quantitative relationship between the area ratio of the weld section fracture small plane and the energy ratio of the D3 frequency band; and determining the danger degree of the weld crack of the to-be-detected high-strength steel structural member by using the relational expression. The steps are simple, and the danger degree of invisible cold cracks of the high-strength steel welding seam can be rapidly evaluated.

An economical process in which cement sheath integrity, perforation cluster spacing and frac plug integrity can be assessed for every frac stage, potentially leading to improvements in stimulation, completion, cementing and drilling practices. It is based on analyzing wellbore pressure responses occurring at key segments of the wireline pump-down and perforating operation and correlating the results among multiple frac stages and wells in a field or play. A special requirement is that the frac ball (ball check) is inserted in the frac plug and pumped to seat prior to performing perforating operations. A complementary benefit of this process is that selectively establishing injectivity in the most distant perforation cluster can be used to establish inhibited HCl acid (wireline acid) coverage across all perforation intervals for uniform reduction in near-wellbore tortuosity.

The invention relates to the technical field of rock mass crack grouting tests, in particular to a model test device for simulating slurry diffusion, which comprises a support frame, an adjusting bracket rotatably arranged above the support frame, a driving mechanism arranged between the adjusting bracket and the support frame, and a plurality of groups of sealing box bodies, side plates are symmetrically and fixedly arranged in the plurality of groups of sealing box bodies, a left fissure plate and a right fissure plate are slidably arranged between the two sets of side plates, the ends of the two sides of the left fissure plate and the right fissure plate are slidably connected with the two sides of the inner wall of the sealing box body respectively, two sets of probes are slidably arranged on the inner wall of each of the left fissure plate and the right fissure plate, and a curvature adjusting mechanism is arranged in each probe. In the use process of the model test device for simulating slurry diffusion, cracks with different widths and tortuosity can be simulated by the test device, the size of the cracks can be adjusted, the size of the cracks can be adjusted, the size of the cracks can be adjusted, the size of the cracks can be adjusted, and the size of the cracks can be adjusted. And a relatively real and accurate slurry diffusion rule can be obtained.

The invention discloses a shale rough fracture and irregular pore fractal model construction method under multi-field coupling, and the method comprises the following steps: S1, constructing a fractal theoretical model based on a rough fracture system; s2, constructing a fractal theoretical model based on a pore system; S3, constructing a solid mechanical control equation; and S5, determining the flow mechanism of shale methane gas between fractures and pores. According to the method, a fractal flow model coupling gas migration, shale deformation and fracture-matrix interaction is established so as to realize quantitative analysis of a shale gas seepage mechanism, and four fractal parameters including tortuosity, roughness, fracture number and fracture length are introduced and evaluated so as to quantify the influence of the fractal parameters on permeability and gas pressure. Through numerical simulation, the interaction between a fracture network and a pore structure under different structure parameters is quantified, and the change rule of the pore fractal dimension and the gas pressure caused by the interaction is emphatically revealed.

The invention provides a secondary battery electrode microstructure multi-parameter generation method and system, and the method comprises the steps: directly embedding voxelization modeling and A * tortuosity quantification based on a shortest path into a geometric generation process, and achieving the controllable approximate decoupling of porosity and tortuosity through a second-order porosity adjustment strategy, and outputting a high-resolution structure file available for simulation. According to the method, a second-order porosity adjustment strategy is realized on a generation level, A * tortuosity calculation is embedded into an evaluation link, and independent or semi-independent controllability of the porosity and the tortuosity is realized; a * voxelization evaluation provides a high-resolution and robust tortuosity quantitative index which can be directly associated with a mass transfer item and a polarization behavior in electrochemical simulation, so that the reliability of a simulation result is improved; the subsequent simulation screening cost is reduced through iterative extreme value sample preservation, and a practical tool is provided for constructing a high-value microstructure sample library and rapidly optimizing an electrode structure.

Disclosed herein is a method for identification of zones of high producibility in shale reservoirs. The method includes obtaining a Total Organic Carbon (TOC) content and an organic sulfur content of a formation interval using geochemical measurements and determining a dielectric dispersion response of the formation interval using dielectric measurements. The dielectric dispersion response is processed to obtain a pore system tortuosity parameter. The pore system tortuosity parameter is correlated with a ratio of the organic sulfur content to the TOC content to identify presence of zones of mature kerogen with high or low hydrocarbon producibility, immature kerogen with a presence of clay, and on-productive or over-mature zones within the formation interval. This correlation is performed by comparing the ratio of the organic sulfur content to the TOC to an organic matter maturity threshold and comparing the pore system tortuosity parameter to a pore system tortuosity parameter threshold.

A filter for the filtration of a fluid, such as a liquid, includes or is constituted by a support element made from a porous ceramic material, at least a portion of the surface of the support element being covered with a porous membrane separating layer, the membrane separating layer being constituted essentially of silicon carbide (SiC), its porosity being between 10% and 70% by volume, the median diameter of its pores being between 50 nanometers and 500 nanometers, its mean thickness being between 1 micrometer and 30 micrometers, and its tortuosity being less than 1.7.

The application discloses a rock pore tortuosity fractal dimension prediction method based on a nuclear magnetic resonance image, and comprises the following steps: after pretreatment of a rock sample, T2 spectrum testing is performed, and a pore size distribution curve is obtained through inversion; an MRI image is acquired by using a nuclear magnetic resonance imaging module, and rock pore distribution fractal dimension is calculated based on the image; the rock pore space is simplified into capillary tubes with different pore sizes and tortuosity, and the number of capillary tubes under different tortuosity is determined; a mathematical relationship between the tortuosity fractal dimension and the pore distribution fractal dimension is established according to the scaling relationship between the pore distribution and the number of capillary tubes, and the tortuosity fractal dimension is solved. The method uses nuclear magnetic resonance technology as an experimental means, directly obtains the pore distribution dimension representing the two-dimensional plane of the pore space through the nuclear magnetic image, takes the dimension as a target parameter, combines the pore size distribution information of the T2 spectrum, calculates the tortuosity fractal dimension, and provides a basis for quantitatively describing the rock pore structure and the permeability characteristics.

The application discloses a shale matrix permeability determination method based on pore size distribution, and comprises the following steps: obtaining shale nitrogen adsorption coefficients by using porosity and nitrogen adsorption test; obtaining scanning electron microscope photos by shooting and splicing; identifying the spliced scanning electron microscope photos, obtaining organic pores and inorganic pores, and obtaining pore areas of shale samples; obtaining equivalent circle radii of shale pores, and establishing a pseudo-continuous shale pore size distribution curve; obtaining shale pore size distribution density functions according to the continuous shale pore size distribution curve; and obtaining shale matrix permeability. The application combines experimental data and theoretical models, solves the influence of fractures on permeability in the shale permeability test process, directly applies the measured sample real pore size distribution to the calculation of shale matrix permeability, considers pore tortuosity, gas adsorption and slip effect, and makes the calculation result more capable of reflecting the shale matrix permeability, and improves the shale matrix permeability test and calculation precision.