Page 92 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 85

2.26 Buoyancy factor

Input(s)
MW: Mud Weight (ppg)

Output(s)
BF: Buoyancy Factor (ppg)

Formula(s)

65:5 MW
BF ¼
65:5

Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 20.

2.27 Buoyancy factor using mud weight
Input(s)

MW: Mud Weight (ppg)
65.5: Weight of Steel (Plain Carbon Steel 1020 (AISI and SAE) ¼ 7.86 gm/cm3 (ppg)

Output(s)

BF: Buoyancy Factor (fraction)

Formula(s)

65:5 MW
BF ¼
65:5

Reference: Lyons, W. C., Carter, T., and Lapeyrouse, N. J., 2012, Formulas and Calculations for Drilling, Production and
Workover, Third Edition, Gulf Professional Publishing, Page: 24.

2.28 Calculations for the number of feet to be cemented
Input(s)

H: Hole Size (in.)
OD: Outer Diameter (in.)
ID: Inner Diameter (in.)
N s : Number of Sacks of Cement to be Used (sacks)
3
Y s : Slurry Yield (ft /stroke)
h c : Feet of Casing (ft)
h sd : Setting Depth of Cementing Tool or Feet of Drill Pipe (ft)
DC: Drill Pipe Capacity (bbl/stroke)
E: Original+extra Volume Req in Percentage (fraction)
PO: Pump Output (bbl/stroke)