Elements of Petroleum Geology, Second Edition

Appendix A: Standard Units and Conversion Factors

Table A.1: Oil Field Units and SI Units

To convert

into

Multiply by

Length, L

feet

inches

12.0

feet

meters

0.3048

meters

feet

3.280

inches

meters

2.54 10 2

meters

inches

39.7

Area, L 2

acres

hectares

0.4046

hectares

acres

2.471

square meters

square feet

10.76

square feet

square meters

9.290 10 2

Volume, L 3

acre-feet

barrels

7758.4

barrels

cubic meters

0.1590

barrels

cubic feet

5.615

cubic meters

barrels

6.290

cubic meters

cubic feet

35.31

cubic feet

barrels

0.1781

cubic feet

cubic meters

2.832 10 2

Flow rate, L 3/T

bbl/day

m 3/s

1.8401 10 6

m 3/s

bbl/day

0.5434 10 6

Mass, M

pounds

kilograms

0.4536

kilograms

pounds

2.205

Density, M/L 3

g/cm 3

kg/m 3

10 3

g/cm 3

lb/ft 3

62.43

kg/m 3

g/cm 3

10 ? 3

kg/m 3

lb/ft 3

6.243 10 2

lb/ft 3

g/cm 3

1.602 10 ? 2

lb/ft 3

kg/m 3

16.02

Pressure, M/(L)(T 2)

atm

psi

14.7

atm

dyn/cm 2

1.0133 10 6

atm

N/m 2

1.0133 10 5

psi

atm

6.805 10 2

psi

dyn/cm 2

6.895 10 4

psi

N/m 2

6.895 10 +3

N/m 2

atm

9.869 10 ? 6

N/m 2

psi

1.450 10 4

N/m 2

dyn/cm 2

10

Absolute viscosity, M/(L)(T)

centipoise

g/(cm)(s) (poise)

1 10 2

centipoise

kg/(m)(s)(=N s/m 2)

1 10 3

Permeability, L 2

Darcy

square centimeters

9.869 10 9

Darcy

square meters

9.869 10 13

square centimeters

Darcy

1.013 10 8

square centimeters

square meters

10 ? 4

square meters

Darcy

1.013 10 2

square meters

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