Formulas and Calculations for Drilling, Production and Workover: All the Formulas You Need to Solve Drilling and Production Problems, Second Edition

Chapter Four: Pressure Control

Kill Sheets and Related Calculations

Normal kill sheet

Prerecorded data

  • Original mud weight (OMW) ______________________________ ppg

  • Measured depth (MD) ___________________________________ ft

  • Kill rate pressure (KRP) _____________ psi @ ______________ spm

  • Kill rate pressure (KRP) _____________ psi @ ______________ spm

Drill string volume

  • Drill pipe capacity ____________ bbl/ft ____________ length, ft = ____________ bbl

  • Drill pipe capacity ____________ bbl/ft ____________ length, ft = ____________ bbl

  • Drill collar capacity ____________ bbl/ft ____________ length, ft = ____________ bbl

  • Total drill string volume _______________________________ bbl

Annular volume

  • Drill collar/open hole Capacity _________ bbl/ft __________ length, ft = __________ bbl

  • Drill pipe/open hole Capacity _________ bbl/ft __________ length, ft = __________ bbl

  • Drill pipe/casing Capacity _________ bbl/ft __________ length, ft = __________ bbl

  • Total barrels in open hole ______________________________ bbl

  • Total annular volume __________________________________ bbl

Pump data

  • Pump output ______________ bbl/stk @ ____________ % efficiency

  • Surface to bit strokes:

    • Drill string volume ____________ bbl pump output, bbl/stk = ____________ stk

  • Bit to casing shoe strokes:

    • Open hole volume ____________ bbl pump output, bbl/stk = ____________ stk

  • Bit to surface strokes:

    • Annulus volume ____________ bbl pump output, bbl/stk = ____________ st

  • Maximum allowable shut-in casing pressure:

    • Leak-off test ____________ psi, using ____________ ppg mud weight

    • @ casing setting depth of __________________________________ TVD

Kick data

  • SIDPP ________________________________________________ psi

  • SICP__________________________________________________ psi

  • Pit gain ________________________________________________ bbl

  • True vertical depth ________________________________________ ft

Calculations

Kill weight mud (KWM)

  • = SIDPP ________ psi 0.052 TVD ________ ft + OMW...

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