Characteristics of rock mechanics and PDC bit optimization of glutenite formation in the Pearl River Mouth Basin oilelds

In order to increase the rate of penetration (rop) in the glutenite formationof the pearl river mouth basin (prmb) oileld, the mineral components of drilling detrituswere tested, and laboratory tests of uniaxial compressive strength (ucs), drillability andabrasivity were undertaken. prediction models of the rock mechanical properties of theglutenite formation with logging data were established. an abrasivity test was done using amodied rock drillability tester with micro polycrystal diamond compact (pdc) bits. thebits used in the glutenite formation were discussed to nd out the reason for the low rop.according to the properties of the rock mechanics and the bit applications of adjacent wells,structures, such as tooth type, crown prole, tooth assembly parameters and the hydraulicstructure of selected bits, were optimized. a new tiger tooth and an anticollision tooth forthe optimized pdc bit were developed to increase shock and wear resistance in gluteniteformation. compared with conventional bits used in glutenite formation, the optimized bitraised footage and rop by 131% and 48%, respectively. the new method, combined withthe properties of rock mechanics, bit application and bit structure, is simple and eectiveto guide the bit design for glutenite formation.