Abstract
The experimental study of hydraulic fracturing, i.e. the experimental study of the interaction between fracturing fluid and rock, was first started by the experiment of plane fracture seepage. in this study, a numerical calculation model is established by applying the net crack water pressure to calculate and analyze the in-plane crack propagation characteristics under in-situ stress conditions. By studying the influence of pre-set crack angle on hydraulic crack propagation behavior, it is found that under the influence of the stress field, stress concentration appears at the crack tip during crack propagation. Under the combined action of confining pressure and water pressure, the fracture surface presents a tension shear state, and its propagation direction is affected by the joint action of tensile stress and shear stress. When there are holes at the bottom of the hydraulic crack, the stress concentration at the tip of the hydraulic crack is greater, and it is easier to crack.
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