deviation hole

deviation hole

[‚dēv·ē′ā·shən ‚hōl]
(petroleum engineering)
Drilled hole with deviation from true vertical, usually limited by contract to 3-5°; not to be confused with a crooked hole, resulting from carelessness or a steeply dipping formation.
References in periodicals archive ?
Hole # From: To: Length Cu Pb Zn Ag Au Deviation Hole ATW-5 677.
The mineralised stockwork, encountered in the ATW-5 deviation hole, is visually similar and has comparable copper values to those stockworks found immediately beneath the Aguas Tenidas' massive sulphide systems.
The ATW-5 deviation hole is the first hole designed to investigate whether or not the Aguas Tenidas' style of mineralisation is duplicated beyond the Northern Fault, and also to determine the possible presence there of any other types of mineralisation.