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The other night, I got into a discussion with a group of well drillers that centered around bits or hole openers backing off in broken, rough-running formations. The reasons — and cures — are pretty straightforward, but often overlooked.
The complete Longyear Diamond Bit Series includes different colors, with each one corresponding to specific hardness ratings found on the standard Mohs hardness scale.
In order to work properly, every bit is designed to run with a given amount of down pressure. It takes a certain amount of push. When drilling vertically, this is bit weight.