Oilfield Glossary
Oilfield Glossary
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spiral borehole

1. n. [Formation Evaluation]
Another term for corkscrew hole, 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.
Synonyms: corkscrew hole