With several limiting assumptions, a mathematical model of the diamond-bit drilling process has been developed. The model represented by an instantaneous rate-of-penetration equation takes into account the reduction in penetration rate during drilling resulting from bit wear. The model has been tested both under laboratory and under field conditions. The comparison of the theoretical and experimental results has shown reasonable agreement. A method for estimating rock properties also has been established. Using this method, we can find the so-called index of rock strength and the index of rock abrasiveness.

Keywords:
penetration rate, rock abrasiveness, bit run, intersect, drill pipe selection, fonnation layer, artificial intelligence, drilling time, rotary speed, logic & formal reasoning
Subjects:
Drill Bits, Drill pipe selection, Drilling fluid management & disposal, Drilling Fluids and Materials, Drilling Operations, Drillstring Design
Copyright 1982, Society of Petroleum Engineers
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