•Sometimes wells must be drilled at high angles or even horizontally•Economic, environmental and technical reasons sometimes require that the well be dilled directionally•Deviated wells can sometimes access more of the reservoir than vertical ones •Large expensive offshore platform act as a central point for several deviated wells and can make these wells economical to drill •Specialized BHA’sare required to drill these wells –Include MWD (Measurements will drilling) tools –Mud motors –Stabilizers •Wells can be drilled in almost any direction now: S or U shaped, Horizontal
