Experiment on effect of cutter parameters of PDC bit on rate of penetration

Key words:  PDC bit  cutter size  back rake  cutter density  rate of penetration

Abstract:

PDC cutter size，back rake and density are very important design parameters affecting the performance of PDC bit. The effects of PDC cutter's size, back rake,and density on the rate of penetration( ROP) of PDC bit were researched through room drilling experiment. The results show that the ROP of the PDC bit designed with cutters diameter of 19 mm is the highest in the rock whose drillability grade is HI. But in the rock whose drillability grade is IV - V , the ROP of the PDC bit designed with cutters diameter of 16 mm is the highest. When the PDC bits designed with cutters diameter of 19 mm and 16 mm are used，the highest ROP is obtained in the back rake about 15°. In the rock whose drillability grade is ID , the ROP decreases with the PDC cutter density increasing，and the effect is obvious.