a. The art of drilling a borehole wherein the course of the hole is planned before drilling. Such holes are usually drilled with rotary equipment and are useful in drilling divergent tests from one location, tests that otherwise might be inaccessible, as controls for fire and wild wells, etc. AGI
b. Drilling in which the course of a borehole is controlled by deflection wedges or other means. The technique of directional drilling is used (1) to deflect a deviated borehole back onto course and (2) to deflect a borehole off course, either to bypass an obstruction in the hole or to take a second core. Syn: slant drilling
Source:
Dictionary of Mining, Mineral, and Related Terms












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