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Interaction model of PDC cutter and rock
WANG Jiajun, ZOU Deyong, YANG Guang, HE Renqing, CHEN Xiuping
(School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China)
Abstract:
A series of drilling experiment were carried out by using experimental equipment, in which load on cutters can be increased. Experiments were conducted with various load, cutting area, cutting speed, back dip angle of PDC cutter and rock properties. The experimental results were analyzed with multiple nonlinear regression technique and a new cutter-rock interaction model was proposed. The results show that the cutter area is the principal factor influencing the force of cutters. The force of cutters increases with cutting area, back dip angle of PDC cutter and rock drillability. It is a logarithmic relationship between the force of cutters and cutting speed.
Key words:  PDC bits  cutters  interaction model  drilling rate  weight on bit