METHOD OF AND SYSTEM FOR CONTROLLING DIRECTIONAL DRILLING

摘要

A method of and system for controlling directional drilling determines a relationship between surface drill string orientation angle and drill bit face angle (75). The method uses the relationship to determine a predicted drill bit face angle. The method then uses the predicted drill bit face angle to achieve a target drill bit face angle (73) by calculating a surface drill string correction angle (77). The correction angle (77) may be displayed to a human driller. Alternatively, the correction angle (77) may be provided as an input to an automated drilling machine (61).