Structure on which the derrick sits. The substructure may provide space for wellhead and well control equipment.

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



“Substructure” means a structure that surrounds the wellbore at the surface and provides the working area for certain employees. It may contain the rotary table.
[Mich. Admin. Code R 408 (2013)].

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



Refer to Drill Floor Substructure.

Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards


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