Methods and systems for drilling boreholes

摘要

A computer-readable medium including program instructions for collaring a borehole. When the program instructions are executed by one or more processors of a computer system operatively associated with a drill rig, the program instructions cause the one or more processors to carry out the steps of performing a first phase collaring operation from a surface start to a point at which a drill bit reaches a dynamically determined collaring depth or a maximum collaring depth, and performing a second phase collaring operation to form a hole collar. The second phase collaring operation includes the steps of retracting the drill bit until the drill bit is above the surface, and activating a water injection system during the retracting of the drill bit.