The Establishment and Evaluation Method of Artificial Microcracks in Rocks

It is necessary to carry out experiments on cores with different degrees of crack development when studying the seepage law cracked reservoirs and evaluating cracks. The experiment in laboratory requires microcrack development; obtained via conventional drilling cannot meet requirements, efficacies evaluation methods geological parameters used for artificial cracks are not perfect. In this study, loaded using a triaxial gripper, produced by changing difference stress; relationship between increased rate permeability change stress concentration evaluate degree real time. angle maximum principal direction, calculated Mohr–Coulomb failure criterion, 20–27.5°, which provides theoretical support process creation. experimental results show that variation curve shows two obvious turning points, divide whole zone into reduction zone, slow increase rapid zone. Through results, complete system creation established, can provide strong study reservoirs.