Directional Drilling Fundamentals Introduction to Directional Drilling

When preparing to drill a vertical or directional well, all operational components of the process are reviewed, optimized and included in a drilling program. The surface location is scouted to determine the best site that will allow for any natural drift, provide suitable access for drilling rig, service rig, production facilities and can be constructed for a reasonable cost. A casing program is prepared to provide 1 adequate well control, 2 prevent water table contamination, 3 maintain...

Azimuth Reference System Conversions

True North Magnetic North Grid North

Most well proposals are generated from rectangular coordinates derived from the UTM or local grid system. The surface location to target direction will therefore be referenced to Grid North. Since wells must be surveyed with sensors that reference direction to either Magnetic or True North, it will be necessary to convert between these references. 92 301 w 30 401 N 91 201 28 40' 91 201 25 40' Magnetic declination correction converts azimuth values between the Magnetic North and True North...