Factors affecting pdc bit design and performance
Four considerations primarily influence pdc bit design and performance:
Mechanical design parameters.
Properties of the rock being drilled.
Geometric parameters of PDC bit design
Geometric considerations includepdc bit shape or profile, which is predicated based on:
The abrasiveness and strength of the formations to be drilled and well geometry.
Each of these factors must be considered on an application-to-application basis to ensure achievement of rate of penetration (ROP) goals during cooling, cleaning the bit, and removing cuttings efficiently. During design, all factors are considered simultaneously.
Cutting structure characteristics
Cutting structures must provide adequate bottomhole coverage to address formation hardness, abrasiveness, and potential vibrations and to satisfy productive needs.
Early (1970s) PDC bits incorporated elementary designs without waterways or carefully engineered provisions for cleaning and cooling. By the late 1980s, PDC technology advanced rapidly as the result of new understanding of bit vibrations and their influence on productivity. Today, cutting structures are recognized as the principal determinant of force balancing for bits and for ROP during drilling.
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