Convert specific gravity to mud weight (ppg and lb/ft3) and
pressure gradient (psi/ft)
Referringto the previous post,Calculate Specific Gravity (SG) in
oilfield unit, you getspecific gravity (SG)frommud weight (ppg and
lb/ft3)and pressure gradient (psi/ft) but youmay need to reverse
calculation fromspecific gravity (SG) to mud weight or pressure
gradient (psi/ft).So you will learn how to how to convert specific
gravity to mud weight (ppg and lb/ft3) and pressure gradient
(psi/ft)by using simple formulas as follows:1. Convert specific
gravity to mud weight in pounds per gallon (ppg)
Convert specific gravity fomula:mud weight in ppg = specific
gravity (SG) x 8.33
Example: specific gravity = 1.50
mud wt, ppg = 1.50 x 8.33
mud wt = 12.5 ppg2. Convert specific gravity to mud weight in
lb/ft3
Convert specific gravity fomula:Mud weight in lb/ft3 = specific
gravity x 62.4
Example: specific gravity = 1.50
Mud weight in lb/ft3= 1.50 x 62.4 lb/ft3
Mud weight in lb/ft3= 93.6 lb/ft33. Convert specific gravity to
pressure gradient inpsi/ft
Convert specific gravity fomula:Pressure gradient in psi/ft =
specific gravity (SG) x 0.433
Example: specific gravity = 1.5
Pressure gradient in psi/ft = 1.5 x 0.433
Pressure gradient in psi/ft = 0.650 psi/ft
