This project quantified the effects of drilling parameters on hole quality, and identified drilling and surveying strategies which ensure acceptable directional control at minimal cost. The data from a library of closely-stationed cased-hole gyro surveys from nearly one hundred directional wells was used to compare as-drilled wellbore geometries to the configurations stipulated in the drilling specifications and defined by the survey taken while drilling. The relationships that exist between the local curvature variations in directional wells and: (1) survey interval; (2) survey tool type; and (3) bottom hole assembly type were quantified, and the influence that these drilling parameters have on target accuracy were characterized. The results of the study assisted participants in designing and implementing directional well drilling programs where tight control was required in terms of both wellbore curvature and well placement with respect to target.

For more information contact: Peter Kis, Manager, Drilling and Completions
tel. (780) 450-8989 x284