Discrete element analysis on the influence of drilling fluid pressure on core discing in pressure-preserved coring

In the process of coring in a high in-situ stress environment, rock core is damaged due to release, and discing prominent manifestation this damage. Pressure-preserved has no direct effect on stress, its influence release related drilling fluid pressure. Yet pressure was not considered most former numerical simulation studies discing. paper, discrete element method software PFC3D used conduct process. According two conditions without with it, different horizontal stresses 5-160 MPa, fracture are observed. addition, law studied, function pressure-preserved prevent explored. Simulation results show nonlinear trends distribution discs both time space.