IDENTIFICATION OF WEAK ZONES IN ROTARY DRILL BITS DURING OFF-CENTER ROTATION

摘要

A method of designing a drill bit is disclosed. The method includes determining a location of a bit coordinate system in a wellbore coordinate system and generating a bit profile based on an angular coordinate around a wellbore axis of a wellbore and the location of the bit coordinate system. The bit profile is based on a cutting edge of a first cutting element on an exterior portion of a first blade. The method also includes determining a cutting layer volume based on the bit profile and identifying a weak zone based on the cutting layer volume being less than a predefined minimum cutting layer volume. The method includes determining a location for a second cutting element on the exterior portion of a second blade based on the weak zone.

主权项

1. A method of designing a drill bit, the method comprising:
determining a location of a bit coordinate system in a wellbore coordinate system; generating a bit profile for a drill bit based on an angular coordinate around a wellbore axis of a wellbore and the location of the bit coordinate system, the bit profile based on a cutting edge of a first cutting element on an exterior portion of a first blade on the drill bit; determining a cutting layer volume based on the bit profile; identifying a weak zone based on the cutting layer volume being less than a predefined minimum cutting layer volume; and determining a location for a second cutting element on the exterior portion of a second blade based on the weak zone.