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Drilling process and apparatus

  • US 5,318,136 A
  • Filed: 09/04/1992
  • Issued: 06/07/1994
  • Est. Priority Date: 03/06/1990
  • Status: Expired due to Fees
First Claim
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1. A drilling process comprising urging a rotating drill bit towards a mass to be drilled, and controlling the thrust applied and the speed of rotation, the process comprising monitoring at least one parameter selected from controlled parameters including rate of penetrating of the drill bit and wear rate of the drill bit, and adjusting at least one related variable selected from adjustable variables including rate of rotation of the drill bit and thrust applied to the drill bit so as to bring the controlled parameters to operating values at which the cost of drilling per unit depth is substantially minimized.

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