| 摘要 |
A computer-implemented method for designing a rotary drill bit having a gauge comprising: (a) determining formation properties, e.g. transition layer strength and inclination angle for use in simulating drilling with the rotary drill bit; (b) determining drilling conditions for use in simulating drilling with the rotary drill bit; (c) determining if the rotary drill bit will be used with a point-the-bit or push-the-bit drilling system; (d) simulating applying a steering motion, a relatively shorter bent length, axial penetration and rotation forces to the rotary drill bit when used with a point-the-bit drilling system; (e) simulating applying steering motion, a relative longer bent length, axial penetration and rotation forces to the rotary drill bit when used with a push-the-bit drilling system; (f) calculating a walk rate based on the simulation of step (e) or (f); (g) comparing the calculated walk rate with a desired walk rate; (h) if the calculated walk rate is not approximately equal to the desired walk rate, changing a bit geometry or a geometric parameter of the gauge; and (i) repeating steps (c) to (h) until the calculated walk rate approximately equals the desired walk rate. |
