Complex structured reservoir in the Gulf of Thailand (GOT) dictates directional drilling design requirement. Torque and drag analysis is used in determination of drill ability from the planned well trajectory. A set of well construction and typical reservoir data in GOT provide constraints for well plan parameters. Both typical 2-dimension (2D) and 3-dimension (3D) well profiles are studied. Each well profile requires different well plan parameters, namely kick off points, build up and drop off rates, inclinations, turn rates, and turn degrees. Sets of well plan parameter guideline for each well type are provided for pre-check drill ability of the designs. For each well profile types, the maximum first inclinations are shown as results for given sets of well plan parameters. The deeper kick off point for 2D well profile benefits on torque and effective tension limits than shallower one. For 3D well design, kick off point and the first inclination have strong effects on torque and effective tension whereas turn degree, build up rate, and turn rate have weaker effects. In addition, high turn degree is drillable with deep kick off point, low build up rate and high turn rate combined.
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