Specific Gravity (SG)

**Specific gravity using mud weight, ppg**

SG = mud weight, ppg : 8.33

Example: 14.5ppg fluid

SG = 14.5ppg : 8.33

SG = 1.74

SG = 1.74

**Specific gravity using mud weight, lb/ft**

^{3}SG = mud weight, Ib/ft

^{3}: 62.4

Example: mud weight = 125 lb/ft

^{3}SG = 125 lb/ft

^{3 }: 62.4SG = 2

**Specific gravity using pressure gradient, psi/ft**

SG = pressure gradient, psi/ft : 0.433

Example: pressure gradient = 0.630psi/ft

SG = 0.630psi/ft : 0.433

SG = 0.630psi/ft : 0.433

SG = 1.45

**Convert specific gravity to pressure gradient, psi/ft**

psi/ft = specific gravity x 0.433

Example: specific gravity = 1.45

psi/ft = 1.45 x 0.433

psi/ft = 0.628

**Convert specific gravity to mud weight, ppg**

Mud weight, ppg = specific gravity x 8.33

Example: specific gravity = 1.85

Mud wt, ppg = 1.85 x 8.33

Mud wt = 15.4ppg

Mud wt = 15.4ppg

**Convert specific gravity to mud weight, lb/ft**

^{3}lb/ft

^{3}= specific gravity x 62.4

Example: specific gravity = 1.95

Ib/ft

Ib/ft

^{3}= 1.95 x 62.4Ib/ft

^{3}= 121.7