| 摘要 |
A method to design a rotary drill bit with a desired bit walk rate comprises the following steps:
(a) determining the drilling conditions and the formation characteristics to be drilled by the rotary drill bit;
(b) simulating drilling of at least one portion of a wellbore using the drilling conditions;
(c) calculating (886b) a bit walk rate by using walk force, bit tilt or tilt rate, and steer force, or by using walk moment, bit tilt or tilt rate, and steer moment;
(d) comparing (888b) the calculated bit walk rate to the desired bit walk rate;
(e) if the calculated bit walk rate does not approximately equal the desired bit walk rate, modifying at least one bit geometry of the rotary drill bit selected from the group consisting of bit profile, cutter location, cutter orientation, cutter density, gauge length, and gage diameter; and
(f) repeating steps (a) through (e) until the calculated bit walk rate approximately equals the desired bit walk rate. |
