Corkscrew Hole
Corkscrew Hole :
(n.) Formation Evaluation. The result of certain drilling conditions that cause the borehole to take the shape of a corkscrew. Most logging tools are much longer than the wavelength of the corkscrew, and therefore see it as a change in standoff or a change in hole size. For this reason, the corkscrew is often observed as a wave on the caliper log. A corkscrew hole affects measurements sensitive to standoff, such as induction and neutron porosity, and may affect pad tools, if they cannot follow the changes. Syn: Spiral Borehole. See: Bad Hole, Cave Effect
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