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Methods and system for designing and/or selecting drilling equipment with desired drill bit steerability

  • US 20070029113A1
  • Filed: 08/07/2006
  • Published: 02/08/2007
  • Est. Priority Date: 08/08/2005
  • Status: Active Grant
First Claim
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1. A method for determining steerability of a rotary drill bit comprising:

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

    (b) applying a steer rate to the bit;

    (c) simulating for a time interval drilling the earth formation by the bit under the set of drilling conditions including calculating a steer force applied to the bit;

    (d) simulating drilling the earth formation for another time interval and recalculating the steer force;

    (e) repeating simulating drilling the earth formation successively for a predefined number of time intervals;

    (f) calculating an average steer force applied to the bit over the simulated time intervals;

    (g) saving the applied steer rate and the calculated average steer force;

    (h) repeating, within a predefined range of steer rates, steps (b) to (g) by incrementally increasing the bit steer rate; and

    (i) analyzing mathematically steer forces as a function of steer rates.

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