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Measures

API gravity

Scale used to express specific gravity of oils. Higher API gravity, lighter oil.

Atmospheric pressure

Weight of atmosphere on surface of Earth. At sea level ap- prox. 1.013 bars.

Bar

One bar = 100 kPa Barrel (bbl)

7.3 bbls = One tonne: 6.29 bbls = One cubic metre: One bbl = 159 litres approx. bcf

Billion Cubic Feet (One bcf = 0.176 Mboe) bcm

Billion Cubic Metres (One bcm = 0.83 MToe)

Billion

One thousand million (109)

Block

UKCS acreage one thirtieth of a quadrant (approx. 200 - 250 sq. kms). Generally defined in terms of latitude and lon­gitude, at one-degree intervals, bopd / boe

bbls of oil per day / bbls of oil equivalent.

Brent blend

International marker for crude oil pricing based on a blend of North Sea crudes.

British Thermal Unit (BTU)

One BTU or Btu = 1.05506 kJ = 0.293 watt-hour

Calorific equivalents

One cubic foot of gas = 1000 BTUs = 1055.06 kJ Approx. one million tonnes of oil = 40 x 1012 BTUs = 40,400 MJ

Candela

SI unit of light intensity defined as 1/60 of the light radia- ted from a sq. cm of a blackbody, a perfect radiator that ab- sorbs no light, held at the temperature of freezing platinum.

Cubic foot

Standard unit used to measure quantity of gas at atmospheric pressure (One cubic foot = 0.0283 cubic metres).

Cubic metre

Si unit used to measure quantity of gas at atmospheric pressure (One cubic metre = 35.31 cubic feet).

Dead Weight (dwt)

Difference between loaded and unloaded weights of a ship. Exposure

Measurement of time during which subject is at risk from , a hazard.

Gas Oil Ratio (GOR)

Volume of gas at atmospheric pressure produced per unit of oil produced.

Joule (j)

Derived SI unit of work or energy.

Gigajoule = One million joules I* 278 kWh.

Kilocalorie (kcal)

One thousand calories.

Kilogram (kg)

SI unit of mass. One thousand grams.

Kilopascal (kPa)

Defined as pressure of 0.0102 kg / sq. cm

Kilowatt-hour (kWh)

One kWh = 3.6 MJ« 3,412 BTU = 860 kcal P 0.0949 cubic metres of gas) m / mcf

Thousands / Thousands of Cubic Feet (of Gas)

mm / M

Millions

mmbbls / mmboe

Million bbls / Million bbls of oil equivalent

nunscf / mmscfd

Millions of Standard Cubic Feet (of Gas) /

Millions of Standard Cubic Feet per Day (of Gas)

Mtc

Million tonnes of carbon

MtCH4

Million tonnes of methane

MtC02

Million tonnes of carbon dioxide

Mboe / MToe

Million bbls of oil equivalent /

Million tonnes of oil equivalent

Oil Equivalent

Method of assessing work of calorific value of different sources of energy in terms of one tonne of oil.

ppb / ppm

parts per billion / parts per million

psi

Pounds per square inch One psi = 6.89 kPa

Quadrant

UKCS acreage one degree by one degree. 30 Blocks to Quadrant.

Specific Gravity

Ratio of density of a substance at a particular temperature to density of water.

SI unit

Self-consistent system of measurement units based on the MKS (metre-kilogram-second) system. Adopted for interna- tional use under Le Systume International d’Unitôs, now employed for all scientific and most technical purposes.

Square kilometres (Sq. kms / Km2)

  1. res x 1000 metres, One Km2 (100 hectares) =

0.3861 sq. miles Square Miles

One Sq Mile (640 acres) = 2.590 Km2

tcf

Trillion (a million million) Cubic Feet (of Gas)

Tonne (t)

Metric tonne = 1000 kilograms

Watt (W)

Power which in one second gives rise to energy of one joule (j). Kilowatt (kW) = One kW = 1000 watts.

Megawatt (MW) = One million watts.

Gigawatt (GW) = Thousand megawatts.

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