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: indicates the drilling bit type, e.g. RCB, APC/XCB, Tricone, etc.
    Bit manufacturer: the bit manufacturer.
    Bit size: bit size in inches.
    Bit serial no: bit serial number.
    Bit jets: number and size of jets on bit.
    Bit operating time: total rotating hours while bit was in operation.
    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.