13 results about "Fracture process" patented technology

The application provides a compact dolomite reservoir composite acid fracturing process parameter evaluation system and method, which comprises a simulated fracture device, an acid injection device and a circulating water injection device. The acid injection device comprises an acid storage container, an acid injection pipeline and an acid discharge pipeline. The acid injection pipeline is connected to the acid storage container and the acid injection liquid inlet hole of the simulated fracture device at both ends. The acid discharge pipeline is connected to the acid injection liquid outlet hole of the simulated fracture device. The circulating water injection device comprises a water storage container, a water inlet pipeline and a circulating water discharge pipeline. The water inlet pipeline is connected to the water storage container and the water injection liquid inlet hole of the simulated fracture device at both ends. The circulating water discharge pipeline is connected to the water injection liquid outlet hole of the simulated fracture device and the water storage container at both ends. The application adopts reverse thinking to evaluate the composite acid fracturing process parameters such as the preflush / acid viscosity ratio, the pump injection displacement and the alternating series by taking the fractal dimension, the acid volume, the flow conductivity and the acid fluid loss as the targets, and is more specific and systematic.

This invention belongs to the field of fracture characterization and reservoir hydraulic fracturing simulation technology. It discloses a method and related equipment for characterizing natural fractures and simulating reservoir damage evolution using a phase-field model. By distinguishing primary and secondary natural fractures based on a discrete fracture network and constructing a model, it achieves accurate characterization of the different sizes and spatial heterogeneity of primary / secondary natural fractures in the model. Natural fractures are characterized as mechanically weak surfaces with differentiated parameters. Hydraulic fractures can capture and interact with natural fractures. Combining a phase-field damage model and a rock mechanics constitutive model, it can accurately simulate key behaviors such as activation and deflection during natural fracture propagation without pre-setting fracture paths, avoiding numerical instability and low computational efficiency. Through dynamic coupling analysis of the entire fluid-solid-damage process, it takes into account the influence of multiple factors such as geostress and fluid pressure, improving the accuracy of phase-field simulation, reducing simulation distortion, providing reliable support for fracturing design optimization, helping to improve reservoir stimulation effects and production benefits, and ensuring the smooth implementation of fracturing processes.

The application provides a kind of transmission wire ice ridge radial fracture strength testing device and method, it is related to transmission line icing test technical field.The application is through integration ice ridge growth module, ice ridge clamping mechanism and thrust exertion and detection system, constitutes a closed technical scheme for ice ridge test.The application first drops water to transmission wire under low temperature environment, to simulate the natural growth forming process of ice ridge, so that the test is closer to real working condition;Ice ridge clamping mechanism clamps ice ridge by jaw assembly;Thrust exertion and detection system exerts controllable thrust to jaw assembly and records the thrust value of ice ridge in real time, ensures the accurate collection of thrust data, realizes the quantitative evaluation of mechanical properties in the fracture process of ice ridge.

The application discloses a kind of (C 20 H 20 P)2MnBr4 In material stress visualization and fracture prediction application, belongs to stress visualization and fracture prediction technical field.It includes the following steps: (1) preparation sensing workpiece: liquid (C 20 H 20 P)2MnBr4 Plastic into the three-dimensional entity consistent with target workpiece geometry;(2) load and collect light signal: under the condition of preset load, load is applied to the sensing workpiece, and the dynamic light image sequence generated under the action of load is synchronously collected;(3) analysis light signal and mapping mechanics behavior.The application realizes the direct physical visualization of stress and fracture process: the application is converted into intuitive, global, real-time optical image by (C 20 H 20 P)2MnBr4 Emission characteristics, abstract simulation calculation cloud picture and discrete measurement data.Stress concentration, crack initiation and expansion and other key mechanical behavior "at a glance", greatly reduce the analysis threshold and interpretation difficulty.

The application discloses a reinforced concrete structure damage process simulation method based on an SPH method, belongs to the technical field of computational mechanics and structure engineering simulation, and comprises the following steps: firstly, removing the damage softening component from the total deformation gradient to obtain an effective physical state and a deformation gradient without interference; secondly, determining a plurality of mechanism criteria of tensile cracking, shear slip and compression plasticity exhaustion, and obtaining a comprehensive damage index through maximum value enveloping; mapping the damage index into a softening factor through a nonlinear square term, correcting the deformation gradient and dynamically adjusting the particle action strength; finally, performing stress gradual attenuation on critical damage particles, and removing the particles after meeting the step number condition. The application can consider the calculation efficiency and the macroscopic mechanical property under a single constitutive framework, accurately restores the material damage softening and the fracture process, effectively avoids numerical oscillation, and improves the precision and stability of the structure damage simulation.

This invention discloses a similarity simulation method for staged hydraulic fracturing of the roof. By optimizing the proportioning scheme of similar materials, the constructed similar material model maintains a similarity to the field prototype in terms of mechanical parameters and structural characteristics. A three-dimensional evaluation system covering depressurization effect, permeability enhancement effect, and reservoir stimulation effect is established, quantifying monitoring data such as acoustic emission, strain, and wave velocity into a comprehensive fracturing effect index. This method can accurately characterize the initiation and propagation laws of the fracture network, quantitatively evaluate the depressurization and permeability enhancement effect of staged fracturing, and provide reliable experimental basis for optimizing field fracturing process parameters. This method solves the problem of single evaluation dimensions in traditional laboratory evaluations, significantly improving the scientific nature and engineering guidance value of fracturing effect evaluation.

The application belongs to the technical field of oxide glass ceramics, and discloses a high-strength quasi-plastic zirconia-reinforced glass ceramic as well as a preparation method and application thereof. The glass ceramic is prepared by uniformly mixing glass raw materials, ZrO2 nano ceramic particles and fluxing agents to obtain mixed slurry, drying to obtain mixed powder, molding and cold isostatic pressing to obtain a green body, melting and heat preservation at 1200-2200 DEG C, and then cooling to obtain the glass ceramic. The glass raw materials include SiO2, MgO, Al2O3 and Re2O3. The glass ceramic has high hardness (> 7 GPa), compressive strength (≥ 4 GPa), high wear resistance and damage resistance, and a thermal expansion coefficient of (3-9) × 10 ‑6 -6, indentation toughness greater than 3 MPa·m 1 / 2 , and quasi-plastic characteristics in the fracture process, i.e. the stress-strain curve presents obvious nonlinear fracture, and can be applied in the fields of intelligent devices, semiconductors, glass coatings or precision instruments.

This invention relates to the field of mine safety and rock strata control technology, specifically to a safe decompression method for long-bore directional hydraulic fracturing in hard rock strata. First, based on the geological conditions, geostress, and mechanical parameters of the target hard rock strata, the design parameters for the long directional borehole are determined. Then, directional drilling combined with a drilling-while-guided system is used to ensure precise borehole positioning within the target rock strata. A segmented isolation device is lowered to form a high-pressure sealed chamber. According to the design parameters, a retreating fracturing process is used to fracture segment by segment, initiating fractures and extending them to the far field. Finally, the fracturing effect is verified through real-time monitoring to complete safe decompression. This invention is a spark-free, low-vibration static operation with no toxic gas generation, ensuring high safety. It can transform the overall impact collapse of rock strata into a layered, small-step, stable collapse, resulting in excellent fracturing control. The use of multi-segment fracturing within a single borehole reduces drilling site and equipment relocation, lowers treatment costs, and is suitable for decompression treatment of hard rock strata in underground coal mines, ensuring safe mine production.

This invention provides a pre-fracturing water shut-off process for high water-cut oil wells using a solid-liquid coupling method, comprising the following steps: 1) Injecting liquid plugging agent: Injecting liquid plugging agent into the water channel in the target oil well formation, allowing it to penetrate deep into the water channel and cross-link into a gel under formation conditions, deeply sealing the water-flooded channels of old fractures and forming a stress shield in the area, providing a basis for secondary fracturing to redirect the flow; 2) Injecting solid plugging agent: Pushing solid plugging agent as a post-slug to the far end of the sealing area, allowing it to solidify under formation conditions to form an isolation layer, and forming a synergistic sealing system with the liquid plugging agent; 3) Secondary redirecting fracturing: Performing fracturing operations under the action of the synergistic sealing system, utilizing stress shielding and the injected fiber temporary plugging agent to force the hydraulic fractures to redirect, forming new fractures in untouched or poorly utilized oil layers. The water shut-off fracturing process provided by this invention simplifies the construction process, reduces operating costs, and improves the productivity of high water-cut oil wells.

The application discloses a multi-component automatic proportioning blending forming system and method of a bio-based composite material. The system collects the rotating speed, torque and pressure and other parameters of each section of a screw rod through a multi-component automatic proportioning system, establishes a material filling state model in combination with the geometric structure of the screw rod, decouples the torque into the distribution of combined shearing action along the axial direction and the radial direction, constructs and dynamically corrects the shearing path experienced by the bio-based fiber according to the pressure jump of the material flow direction and the section junction, simulates the progressive fracture process of the bio-based fiber under the synergistic action of axial stretching and radial bending along the shearing path, accurately obtains the cumulative evolution result of the fiber length, and determines the fiber segmented state of each screw rod section. According to the fiber segmented state, the rotating speed of the screw rod and the position of the multiple axial feeding ports are synergistically adjusted and iteratively optimized, effectively solving the process difficulty that the bio-based fiber is easily broken during blending, and improving the mechanical properties and processing stability of the final composite material.

This invention discloses a method for testing the conductivity of fractures during the entire supercritical CO2 acid fracturing cycle. It primarily obtains corresponding indoor simulated experimental parameters such as temperature and fluid from the three stages of supercritical CO2 acid fracturing in a mining environment: acid injection, well shut-in, and flowback. This allows for a full-cycle simulation experiment across these three stages, ultimately yielding the conductivity of fractures during the entire supercritical CO2 acid fracturing cycle. The testing method provided by this invention considers the cooling effect and flow / dissolution process of the supercritical CO2 + acid mixture flowing from the wellbore to the distal fracture during the acid injection stage; the fracture recovery and static dissolution process of the mixture during the well shut-in stage; and the reverse flow, dissolution, and fracture heating process of the mixture during the flowback stage. This more realistically simulates the entire supercritical CO2 acid fracturing process, providing support for theoretical research on supercritical CO2 acid fracturing technology.

This invention relates to the field of hydraulic fracturing testing technology, and particularly to a fracture monitoring method, a brine hydraulic fracturing experimental apparatus, system, electronic equipment, and medium. The method includes: adjusting the concentration of the injected brine using a brine concentration control module based on a preset concentration curve, the concentration curve dynamically changing with experimental time or real-time multiphysics feedback data; during the hydraulic fracturing process of the injected brine, acquiring multiphysics data of the target fracture using a multiphysics monitoring module; and calculating the blockage state and salting-out degree of the target fracture using a multiphysics coupling analysis algorithm based on the multiphysics data. This approach solves the technical problem of existing technologies being unable to monitor the multiphysics coupling process under high temperature and high salinity conditions, improving the depth of research and the fidelity of experimental simulations regarding the fracture salting-out blockage mechanism during brine discharge from salt cavern-type compressed air energy storage.