Abstract
In this study four marble rocks were drilled by diamond core bit using a fixed laboratory-drilling machine at 400 and 1200 rpm, rotational speed, and over a range of weights on bit (WOB) 45, 60, 75, 90, … 225 Kg. Operating parameters of the drill bit such as WOB, penetration rate (PR), torque (T) and drilling specific energy (SE) were continuously monitored during the drilling trials. The effects of these parameters on the penetration rate were examined, and the effects of formation properties on the drilling rate were examined. Relationships between WOB and both PR, torque T and SE were described and the relationship between PR and SE was determined. Graphs are presented which can be used to predict diamond-drilling performance easy and fast.
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