Singular Behavior and Its Control of Hydraulic Fracture in Sands Verified in Laboratory Experiments with Aid of CT Scanner

Takatoshi Ito1, Hyuga Yoshida2, Yusuke Mukuhira1, Koji Yamamoto3 and Yoshihiro Tsuchiya4, (1)Tohoku University, Institute of Fluid Science, Sendai, Japan, (2)Tohoku University, Sendai, Japan, (3)Japan Oil, Gas and Metals National Corporation (JOGMEC), Tokyo, Japan, (4)Japan Oil, Gas and Metals National Corporation (JOGMEC), Chiba, Japan