Core drilling summary

Report includes detailed drilling data for each core: pump(s) used, mud pumped, strokes, shear pins/pressure, bit size/rotation, weight on bit, top drive torque, rate of penetration, core jams, winch and wirelines, core catcher/shoe and barrel; and if core orientation, drillover, formation temperature, tracers, liners were used.

Data File format

    Exp: expedition number
    Site: site number
    Hole: hole number
    Core: core number
    Type: type indicates the coring tool used to recover the core. Common types are F, H, R, X. Core types 1-9 indicate intervals drilled without coring.
    Time on deck (UTC): time at which the driller observed the core on deck.
    Top depth drilled (m): depth below seafloor of beginning of drill string coring advancement.
    Bottom depth drilled (m): depth below seafloor at end of drill string coring advancement.
    Bottom depth recovered (m): depth below seafloor calculated from Core top depth and recovered length.
    Advanced (m): advancement of drill string during coring or drilling.
    Cored (m): advancement of drill string during coring.
    Recovered (m): core length measured on the catwalk (sum of section lengths as observed on the catwalk).
    Recovery (%): recovered length / advanced * 100 (for cored intervals only).
    Pump: which pump was used (1, 2, or both).
    Speed holes: number of holes open for fluid flow.
    Pull (klb): how much overpull was needed to free the core barrel.
    Partial stroke: whether a partial stroke occurred.
    SPM: strokes per minute.
    Shear pin: number and type of shear pin used.
    Shear pressure (psi): shear pin pressure.
    Pressure (psi): rotary pressure.
    Bit (rpm): bit rate of rotation.
    WOB (klb): weight on bit.
    Torque (amps): top drive torque.
    No liner: Y indicates a liner was not used.
    Real ROP (m/h): real rate of penetration that only takes into account the time it takes to cut a core.
    Gross ROP (m/h): gross rate of penetration that also takes into account wireline time.
    Core jam: whether core was jammed.
    Core catcher: type of core catcher used.
    Winch: aft (A) or forward (F) winch used
    Wireline (No): number of wireline runs.
    Core barrel: core barrel type used.
    Shoe: shoe type used.
    Orient: whether core is oriented.
    Time (min) minutes to cut or drill.
    Drill over: whether the interval was drilled over.
    Mud pumped (bbl): barrels of mud pumped.
    Temperature: whether formation temperature measurements were taken.
    PFT: whether perfluorocarbon tracers were used.
    Microspheres: whether microspheres were used.
    Comments: comments made by the driller or operations superintendent.