Measurement of Drilling Properties

Abstract

Summary Rock-bit performance is related here to formation strength. Bingham mathematical models and steel-tooth rock bits are used in a procedure to optimize rates of penetration (ROP's) and to extend bit life. The ability to distinguish elastic formations from plastic formations has been used to introduce polycrystalline-diamond-composite (PDC) bits in the Gulf of Mexico, where shale is the predominant formation. The validity of the mathematical models has been confirmed on long, homogeneous shale sections, and the models have also been expanded to include soft-formation insert rock bits.