BAKER HUGHES - Drilling Fluids Reference Manual

PRESSURE PREDICTION AND CONTROL
Fluid (Mud) Weight to Balance a Kick
MW 2 = MW 1 +
SIDP
0.052 × TVD
Determination of the Nature of Invading Fluids
W 1 = MW 1 -
SICP − SIDP
0.052 × L
Maximum Casing Pressure Resulting from a Gas Kick *
P csg max = 200
(
2
P )( V )( MW )
C
Maximum Volume Increase while Circulating Out a Kick *
V gain max = 4
( P)(
V )( C)
MW
2
* Even with the solubility of gas in oil, these formulas will hold true in oil-base fluids.
Formation Pressure or Bottomhole Pressure
BHP = (MW 1 x 0.052 x TVD) + SIDP
Maximum Initial Shut-In Casing Pressure which will Exceed Fracture
Gradient
SICP max = (F mw – MW 1 ) x 0.052 x TVD s
MIL-BAR® Required to Weight up 1 bbl of Fluid **
Sacks of MIL-BAR to weight up 1 bbl of fluid =
14.7 ( MW2
− MW1
)
35.0 − MW
2
** Specific Gravity of Barite = 4.2
BAKER HUGHES DRILLING FLUIDS
REFERENCE MANUAL
REVISION 2006 12-41