4 results about "Internal fracture" patented technology

A distributed ultrasonic monitoring system for an internal fracture process of an ultra-large three-dimensional geological model includes a high-power ultrasonic phase control apparatus, ultrasonic transmitting and receiving integrated sensors, and measurement and control and three-dimensional ultrasonic imaging software. A geometric asymmetric monitoring layout mode is adopted to form a three-dimensional monitoring grid. The sensors are coupled with the three-dimensional geological model using a pre-embedded manner, the sensors according to sequential numbers are connected to the high-power ultrasonic phase control apparatus, and the sensors of each chain sensor array are excited one by one according to a pre-set delay time; and the three-dimensional ultrasonic imaging software inverts and analyzes a three-dimensional wave velocity field of the monitoring areas according to a relationship of echoes, transmission wave signals and the three-dimensional grid, and reflects rock fracture positions and degrees through changes in the wave velocity field.

This invention relates to the technical field of deep well mining, and particularly to a real-time analysis and early warning method for true triaxial hydraulic fracturing test data. The method includes the following steps: acquiring multi-source monitoring data during the true triaxial hydraulic fracturing test, wherein the multi-source monitoring data includes mechanical property data, fluid parameter data, deformation monitoring data, and fracture evolution correlation data; assigning verification weights matching the test conditions based on the heterogeneous attributes of the mechanical property data, fluid parameter data, deformation monitoring data, and fracture evolution correlation data; and verifying the acquisition timestamps and range matching of each data point using the verification weights to generate a standard dataset. The real-time analysis and early warning method for true triaxial hydraulic fracturing test data provided by this invention can simultaneously capture the stress field, fluid transport, deformation state, and internal fracture evolution characteristics of rock samples, improving the comprehensiveness of rock sample condition characterization and solving the problem of one-sided condition perception.

The application discloses a coal body hydraulic fracturing fracture three-dimensional space network reconstruction and characterization method, which is based on real CT three-dimensional body data, can realize the transformation of fracture structure from geometric visualization to parameterization and evaluation, can directly reflect the real connection relationship of the fracture in the three-dimensional space by identifying and three-dimensionally reconstructing the internal fracture of the coal body before and after fracturing, avoids the connection misjudgment and scale deviation caused by two-dimensional slice inference, improves the authenticity of the evaluation result from the source, and simultaneously adopts skeletonization and node-edge modeling on the fracture network, converts the three-dimensional voxel fracture structure into a node-edge form fracture network model, significantly reduces the calculation complexity under the premise of ensuring the fracture space connection relationship, enables the connectivity and flow conductivity characteristics of the fracture network to be expressed in the form of unified parameters, and is especially suitable for the fracture network characterization of the laboratory true triaxial test and the digital coal rock sample data based on CT scanning.

The application provides a method for optimizing mixing ratio of temporary plugging agents with different particle sizes based on visualized experiment, which comprises the following steps: carrying out internal fracture temporary plugging experiment of temporary plugging agents with different particle sizes mixed in different ratios; calculating maximum length L of plugging layer, permeability K and fluctuation degree F of fracture flow channel at the position of plugging layer formed by temporary plugging agents with different particle sizes mixed in different ratios under the conditions of same temporary plugging agent dosage and concentration, carrying fluid viscosity and discharge capacity; calculating optimal index I, mixing mass ratio of temporary plugging agents with different particle sizes corresponding to the maximum optimal index I according to the maximum length L of plugging layer, permeability K and fluctuation degree F of fracture flow channel, and obtaining optimal result. The method has reliable principle, simple operation, can effectively optimize mixing ratio of temporary plugging agents with different particle sizes, improve internal fracture temporary plugging effect, and effectively supports the development of internal fracture temporary plugging technology of deep shale gas horizontal well fracturing.