Propagation simulation and permeability test integrated experimental device for true triaxial crack, and method thereof

Abstract

The invention discloses a propagation simulation and permeability test integrated experimental device for a true triaxial crack, and a method thereof. The device comprises a true triaxial loading system, a fracturing system, an acoustic emission detecting system and a permeability testing system; and the fracturing system, the acoustic emission detecting system and the permeability testing systemcan be respectively connected with the true triaxial loading system according to experimental requirements. The device and the method realizes the integration of rock fracturing and permeability testing, can accurately measure the permeability before and after rock fracturing under true triaxial conditions, and provide a technical support for the studying of a fracturing technology and the optimization of fracturing construction parameters.

Description

technical field [0001] The invention relates to rock mechanics and engineering technology, in particular to an experimental device and method integrating true triaxial crack propagation simulation and permeability testing. Background technique [0002] With the emphasis on the exploration and development of unconventional oil and gas resources, especially the breakthrough in shale gas exploration and development technology, large-scale hydraulic fracturing technology has been widely promoted and applied in order to obtain efficient and economical single well production. Large-scale hydraulic fracturing technology has always been a key breakthrough and key research direction in the development of the shale gas industry, and fracture expansion is one of the key research contents of hydraulic fracturing technology, which directly affects the effect of hydraulic fracturing. At present, the main means of fracture propagation research are indoor experimental simulation technology ...

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Problems solved by technology

However, currently limited by the equipment conditions and methods of the fracture propagation simulation experiment, under the true triaxial stress condition, the test items of a single test are limited, and the characterization of the reconstruction effect before and after the hydraulic fracturing simulation experiment is not accurate. If the permeability test before and after fracturing is required , the equipment needs to be disassembled many times, and it is difficult to realize the permeability test of the rock before and after fracturing under in-situ conditions

[0005] CN105136646A discloses a permeation evolution experimental device and method considering shale adsorption and fracturing process, the experimental device includes a gas pressure fracturing system unit and a permeability measurement system unit; although it has realized the integration of fracturing and permeability testing, However, its gas pressure fracturing system unit and permeability measurement system unit have complex structures and cumbersome operations, and because the shale sample and the pressure pad are clamped before measurement, the side of the fracturing hole orifice of the shale sample The pressure pad of the shale sample has been processed with fracturing channels in advance, and the fracturing holes are connected with the outside through the fracturing channels, and the pressure pads on the other three sides of the shale sample are pre-processed with permeable channels. The gas pressure fracturing system unit is connected with the fracturing hole, and one of the three pressure-bearing pads with permeation channels is selected, and the permeability measurement system unit is connected with the selected pressure-bearing pad permeation channels , by selecting different pressure pads to meet the determination of permeability in different directions, so it can only measure the permeability of one side of the specimen, but cannot measure the overall permeability of the specimen, and does not fully reflect the fracturing results

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