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

In order to increase the Rate Of Penetration (ROP) in the glutenite formation of the Pearl River Mouth Basin (PRMB) oileld, the mineral components of drilling detritus were tested, and laboratory tests of Uniaxial Compressive Strength (UCS), drillability and abrasivity were undertaken. Prediction models of the rock mechanical properties of the glutenite formation with logging data were established. An abrasivity test was done using a modied rock drillability tester with micro Polycrystal Diamond Compact (PDC) bits. The bits 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 prole, tooth assembly parameters and the hydraulic structure of selected bits, were optimized. A new tiger tooth and an anticollision tooth for the optimized PDC bit were developed to increase shock and wear resistance in glutenite formation. Compared with conventional bits used in glutenite formation, the optimized bit raised footage and ROP by 131% and 48%, respectively. The new method, combined with the properties of rock mechanics, bit application and bit structure, is simple and effective to guide the bit design for glutenite formation.