Hole drilling summary

Report includes detailed drilling data: BHA length, bit parameters, and primary depth measurements.

Data File format

	Exp: expedition number
	Site: site number
	Hole: hole number
	BHA length (m): combined length of all bottom-hole assembly components.
	Bit type:
	Bit manufacturer:
	Bit size:
	Bit serial No:
	Bit jets:
	Bit operating time:
	Seafloor depth (mbrf): seafloor depth determined by the driller.
	PDR depth (mbrf): seafloor depth measured by the precision depth recorder (PDR) on approach to a site.