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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.