HEAVY WEIGHT ROCK BITS INCREASE PENETRATION RATES IN HARD ROCK

Robert E. Grimes Hughes Tool Co. Houston Floyd C. Felderhoff Hughes Tool Co. Midland, Tex. Harvey Brown Hughes Tool Co. Singapore Faster penetration rates and lower costs per foot result from the use of bits designed specifically for drilling with high weight-on-bit (WOB) in the hard rock formations of the Permian basin. The dolomite and limestone formations indigenous to this area are more responsive to increased WOB rather than higher rotary speeds (rpm). Historically, the heavier weights

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