Page 61 - Formulas and Calculations for Petroleum Engineering

54 Formulas and calculations for petroleum engineering

1.122 Solution gas water ratio

Input(s)
T: Temperature (F)
S: Salinity (% by weight solids)
R swp : Solution gas to pure water ratio (SCF/STB)

Output(s)
R sw : Solution Gas Water Ratio (SCF/STB)

Formula(s)

Rsw ¼ Rswp 10 0:0840655 S T 0:285854

Reference: Applied Petroleum Reservoir Engineering, Second Edition, Craft & Hawkins, Page: 46.

1.123 Somerton method for formation permeability in coalbed methane reservoirs

Input(s)
k o : Original Permeability at Zero Net Stress (mD)
Ds: Net Stress (psi)

Output(s)

k: Permeability (mD)

Formula(s)

ð 0:003Þ Ds 1 1
k
k ¼ k exp +0:0002 ð DsÞ 3 ðÞ 3
o 0:1 o
k
o
Reference: Ahmed, T., McKinney, P.D. 2005, Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3,
Page: 226.
1.124 Specific gravity of gas hydrate forming components

Input(s)

m h : Molar Mass (g)

Output(s)
G h : Specific Gravity of Hydrate-forming Components (dimensionless)

Formula(s)

m h
G ¼
h
28:96
Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3,
Page: 274.