Appendix 13 - Glossary of Terms and Abbreviations

APPENDIX 13 - GLOSSARY OF TERMS AND ABBREVIATIONS

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Associated Gas

Natural Gas Associated with oil accumulations, which may be dissolved in the oil at reservoir conditions (solution gas) or may form a cap of free gas above the oil (gas cap).

ACHARR

Advisory Committee on Hydrocarbons Additional Recovery Research.

BPEO

Best Practicable Environment Option.

BOPD (often bopd)

Barrels of oil per day.

CATS

Central Area Transmission System.

Coal Bed Methane (CBM)

Natural gas produced in a coal seam during the formation of the coal. Coal seams form the reservoir rocks and traps for the methane, which is usually of near- pipeline quality.

Condensate

A mixture of pentanes and higher hydrocarbons.

Conversion Factors (approximate)

1 tonne crude oil = 7.5 barrels = 1.19 cubic metres;

1 barrel (US) = 35 Imperial gallons = 0.16 cubic metres;

1 cubic metre = 35.31 cubic feet;

1 billion cubic metres of gas = 0.92 million tonnes of oil equivalent;

1 cubic metre of gas = 0.36 therms;

1 tonne fuel oil = 405 therms;

1 therm = 105.5 megajoules (MJ);

1 kilowatt hour = 3.6 megajoules.

1 million tonnes of crude oil = 7.5 million barrels;

1 million tonnes of crude oil per year = 21 thousand barrels per day.

(See also Tonne of Oil Equivalent below.)

CRINE Network

"Cost Reduction Initiative for the New Era". An oil industry-Government exercise to aid greater competitiveness.

Dry Gas

Natural gas composed mainly of methane with only minor amounts of ethane, propane and butane and little or no heavier hydrocarbons in the gasoline range.

EAGLES

East Anglian Gas and Liquids Evacuation System.

EIA

Environmental Impact Assessment.

ETAP

Eastern Trough Area Project.

FLAGS

Far-north Liquids and Associated Gas System.

FPSO

Floating Production Storage and Offtake vessel.

LNG

Liquefied natural gas. Natural gas, gaseous at normal temperatures and pressures but held in the liquid state at very low temperatures (and at high pressure), to facilitate storage and transport.

LOGGS

Lincolnshire Offshore Gas Gathering System.

LPG

Liquefied petroleum gas. Essentially propane and/or butane meeting fuel use specifications, gaseous at normal temperatures and pressures but held in the liquid state by pressure to facilitate storage and transport.

MMSCFPD (often mmscfpd)

Millions of cubic feet per day.

NGLs

Natural gas liquids. A mixture of liquids derived from natural gas, including

propane, butane, ethane and gasoline components (pentanes plus).

PON

Petroleum Operations Notice.

SAGE

Scottish Area Gas Evacuation.

SEAL

Shearwater-Elgin Area Line.

Tonne of Oil Equivalent

One tonne of oil equivalent is defined as having a calorific value of 397 therms. All fuels, including crude oil and petroleum products, have been converted to the tonne of oil equivalent using their own calorific values.

Note: Further details of the conversion methods used, and the calorific values of fuels, may be found in the annual Digest of United Kingdom Energy Statistics (available from Stationery Office).