Drilling method and apparatus

  • US 6,050,348 A
  • Filed: 06/17/1997
  • Issued: 04/18/2000
  • Est. Priority Date: 06/17/1997
  • Status: Expired
First Claim
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1. A drill string drive comprising:

  • a motor adapted to rotate a drill string;

    a sensor adapted to detect the rotation of said drill string at the surface; and

    a computer receiving rotational information from said sensor, said computer transmitting control signals to said motor, said computer programmed to control said motor to advance said drill string to a predetermined angle.

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