USEFUL CONVERSION FACTORS

 Length

1 meter = 39.37 in.

1 inch = 2.54 cm

1 foot = 30.48 cm = 0.3048 m

1 nautical mile = 6076 ft

1 meter          = 1.0936 yards

1 centimeter  = 0.39370 inch

1 inch             = 2.54 centimeters

1 Kilometer   = 0.62137 mile

1 mile            = 5280 feet

= 1.6093 kilometers

1 angstrom            = 10-10 meter

Area

SI Unit: meter-squared (m2)

1 square Kilometer           = 0.3861 mile2

1 square meter  = 1.1960 inch2

= 10.763 feet2

1 square centimeter          = 0.155 inch2

1 square mile = 2.590 Km2

1 square yard    =  0.8361 m2

1 square foot = 0.0929 m2

1 square inch = 6.452 cm2

Mass

SI Unit: Kilogram (Kg)

1 lbm = 453.6 g = 0.4536 kg = 7000 gr. (grain)

1 Kg = 1000 g = 2.204 6 lbm

1 slug = 1 lbf s2/ft = 32.174 lbm

1 US ton = 2000 lbm (also called short ton)

1 long ton = 2240 lbm (also called British ton)

1 ton          = 1000 kg (also called metric ton) = 2204.6 lbm

1 kip = 1000 lb

1 Kilogram    = 1000 grams

= 2.2046 pounds

1 pound          = 453.59 grams

= 0.45359 Kilogram

= 16 ounces

1 ton              =     2000 pounds

= 907.185 Kilograms

1 metric ton   = 1000 Kilograms

= 2204.6 pounds

1 amu             = 1.66056 x 10-27 Kilograms

Force

1 lbf = 4.448 N = 4.448 x 105 dynes

1 lbf = 32.174 poundals = 32.174 lbm ft/s2

Gravitational Acceleration

g = 32.2 ft/s2 = 9.81 m/s2

m/s2,

where

= the geographic latitude of the earth ellipsoid measured from the equator in degrees 

Pressure

SI Unit: pascal (Pa)

1 atm = 14.69595 psia = 2118 lbf/ft2

= 29.92 in. Hg = 760 mm = 1.013 bars

= 33.93 ft H2O = 1.0l3x10 Pa = 101.3 kPa

1 Pa = 1 N/m2 = 10-5 bars

1 pascal         = 1 N

m2

= 1 Kg

m s2

1 atmosphere = 101.325 Kilopascals

= 760 torr (mmHg)

= 14.70 pounds per

square inch

1 bar              = 105 pascals 

Volume

SI Unit: cubic meter (m3)

1 ft3 = 7.481 U.S. gal = 6.31 Imperial gal = 28.316 L

1 m3 = 1000 L = 106 cm3 = 264.2 U.S. gal = 35.31 ft = 264.2 gal = 35.31 ft3

1 bbl = 42 U.S. gal = 5.61 ft3

1 bbl = 9694.08 in3

1 liter                   = 10-3 m3

= 1 dm3

= 1.0567 quarts

1 gallon               = 4quarts

= 8pints

= 3.7854 liters

1 quart                 = 32 fluid ounces

= 0.94633 liter 

Density

Water = 62.4 lbm/ft3 = 1000 kg/m3 = 1 g/cm3 = 8.33 lbm/US gal

°API, 60° F = (141.5/SG,60°F) – 131.5

SG, 60° F = (141.5)/(°API,60°F + 131.5) 

Velocity

1 knot = 1 nautical mile/hr

60 mph = 88 ft/s 

Temperature

°F = 1.8 (°C) + 32

°R = °F + 459.67 = 1.8 (K)

0 K                 = -273.15oC

= -459.67oF

K                    = oC + 273.15

oC                   = 5/9(oF – 32)

oF                   = 9/5(oC) + 32 

Energy

SI Unit: joule (J)

1 J = 1 kg m2/s2 = 107 dyne

1 BTU = 777 ft lbf = 252 cal = 1055 J

1 hp hr = 2545 Btu

1 kW hr = 3412 Btu = 1.341 hp hr

1 joule                 = 1 kg m2

s2

= 0.23901 calorie

= 0.4781 x 10-4 btu

(British thermal unit)

1 calorie              = 4.184 joules

= 3.965 x 10-3 btu

1 btu                    = 1055.06 joules

=          252.2 calories 

Power

1 hp = 550 ft lbf/s = 33,000 ft lbf/min

Watt (W) = Joule (J) / s

Joule (J) = N-m

Coulumb (C ) = Amp – second (As) 

Gas Constant

R = 1.987 Btu/lb mol °R = 1.987 cal/g mol K

= 0.7302 atm ft3/lb mol oR = 1545 ft lbf/lb mol oR

= 0.08206 L atm/g mol K

= 82.06 atm cm3 mol K

= 8314 Pa m3 mol K ox. J/kg mol K

= 8.314kJ/kgmOl K 

Viscosity

1 cP =0.01 Poise = 0.01 g/cm s = 0.01 dyne s/cm

= 0.001 kg/ms = mPa s = 0.001 N s/m2

= 2.42 lbm/ft hr = 0.0752 slug/ft hr

= 6.72×10-4 lbm/ft s

= 2.09×10-5 lbf s/ft2

1 Pa s = 0.0209 lbf s/ft2 = 0.672 lbm/ft s

Acceleration Due to Gravity

g = 32.2 ft/s2 = 9.81 m/s2 

SI Metric Conversion Factors

bbl/ft x 5.216              E-01 = m3/m

cP x 1.0                       E –03 = Pa.s

ft x 3.048                    E-03 = m

gal x 7.460 43             E-03 = m3

hp x 7.460 43              E-01 = kW

  1. x 2.54 E+00 = cm

lbf x 9.869 233                       E-00 = Nm

lbf/ft2 x 4.788 026                  E-02 = kPa

lbm x 4.535 924                      E-01 = kg

lbm/ft3 x 1.601 846                E+01 = kg/m3

lbm/gal x 1.198 264               E+02 = kg/m3

md x 6.894 757                       E-04 = m2

psi x 6.894 757                       E+00 = kPa

psi/ft x 2.262 059                   E+01 = kPa/m

sq.in x 6.451                           E+00 = cm2

Metric Prefix Conversions

pico-        1p(x)           = 10-12(x)

nano-       1n(x)           = 10-9(x)

micro-      1u(x)           = 10-6(x)

milli-       1m(x)         = 10-3(x)

centi-       1c(x)           = 10-2(x)

deci-        1d(x)           = 10-1(x)

Base Unit (x)  = m, L, g

Deca-       1D(x)          = 101(x)

Hecto-      1H(x)          = 102(x)

Kilo-        1K(x)          = 103(x)

Mega-      1M(x)         = 106(x)

Giga-       1G(x)          = 109(x)

Tera-        1T(x)          = 1012(x)

OTHER REFERENCES

More details can be obtained from Drilling Calculations501 Solved Problems for Drilling Operations.

SEE ALSO

Glossary of Drilling Operations

The Oil Drilling (Video)

Conversion Factors

The Mud Lag Time (Video)

General Terms

Gel Strength

Mud Weight

Formation Pressures

Well Control Calculations

The General Calculations(Video)

EXTERNAL LINKS 

RSS

The Halliburton RSS Point the Bit System (Video)

The Baker Hughes RSS Push the Bit System (Video)

The Weatherford RSS (Video)

The Schlumberger RSS Push the Bit System (Video)

The Gyrodata RSS (Video)

Mud Motor

The Dyna-Drill Motor (Video)

The Jaguar Mud Motor System (Video)

The Baker Hughes Navi-Drill (Video)

The Mud Motor Basic Function (Video)

The Hunting Mud Motors (Video)