British thermal unit. The amount of energy required to raise the temperature of one pound of water by one Fahrenheit degree. One BTU is equivalent to 252 calories, 0.293 watt-hours or 1,055 joules.

The arrangement of pipes and valves at the wellhead to control the flow of oil or natural gas and to prevent blowouts.

Compressed natural gas.

The procedure by which a successful well is readied for production.

Stations located along natural gas pipelines which re compress gas to ensure an even flow.

Any area where natural gas can be drilled and extracted vertically.

The amount of natural gas required at room temperature at sea level to fill a volume of one cubic foot.

A steel structure mounted over the borehole to support drill pipe and other equipment that is lowered and raised during drilling operations.

A technique that enables drilling at an angle to reach a particular underground formation.

The controlled and safe burning of gas which cannot be used for commercial or technical reasons.