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Saturday, March 10, 2012

Convert specific gravity to mud weight (ppg and lb/ft3) and pressure gradient (psi/ft)

Referring to the previous post, Calculate Specific Gravity (SG) in oilfield unit , you get specific gravity (SG) from mud weight (ppg and lb/ft3) and pressure gradient (psi/ft) but you may need to reverse calculation from specific 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 ppg

2. 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/ft3

3. Convert specific gravity to pressure gradient in psi/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


Please also find the Excel sheet regarding how to convert specific gravity (SG)

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