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METHODS AND SYSTEMS FOR DESIGNING AND/OR SELECTING DRILLING EQUIPMENT USING PREDICTIONS OF ROTARY DRILL BIT WALK

  • US 20100300758A1
  • Filed: 08/16/2010
  • Published: 12/02/2010
  • Est. Priority Date: 08/08/2005
  • Status: Active Grant
First Claim
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1. A method for determining bit walk rate of a rotary drill bit comprising:

  • applying a set of drilling conditions to the bit including at least bit rotational speed, rate of penetration along a bit rotational axis, and at least one characteristics of an earth formation;

    applying a steer rate to the bit;

    simulating, for a time interval, drilling of the earth formation by the bit under the set of drilling conditions, including calculating a steer force applied to the bit and an associated walk force;

    calculating a walk rate based on the bit steer rate, the steer force, and the walk force;

    repeating simulating drilling the earth formation for another time interval, and recalculating the steer force, the walk force and walk rate;

    repeating the simulating successively for a predefined number of time intervals; and

    calculating an average walk rate of the bit using an average steer force and an average walk force over the simulated time interval.

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