Open hole

Uncased part of the wellbore.

Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards


Open hole

“Open hole” means the uncased part of the welbore. [Mich. Admin. Code R 408 (2013)].

 Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations


Open hole

“Open hole” means that portion of a well bore or lateral that is:

  1. not cased, or
  2. cased, but the casing is not cemented in place, and is not otherwise isolated from the formation.

Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. Regulations

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