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bad hole

1. n. [Formation Evaluation]

A borehole that is not to gauge or is rugose. The term usually refers to the detrimental effect that such a borehole has on the response of logging measurements, in particular pad tools like the density or microresistivity. The existence of bad hole is usually determined by a caliper log and on various secondary measurements such as delta rho.

See: cave effectcorkscrew holerugosity