A well that is capable of producing hydrocarbons in sufficient quantities to justify commercial exploitation. Propane

A convex-upward formation of rock layers, which may form a trap for hydrocarbons. Appraisal Well

Naturally-occurring, inflammable organiz matter formed from kerogen in the process of petroleum generation which includes hydrocarbons such as asphalt and mineral wax a sticky, black and highly viscous liquid or semi-solid form of petroleum. Blow-out preventers (BOPs)

Land leased for oil and gas exploration and/or land containing underlying oil and gas or mineral rights. Annulus

An underground layer of water-bearing permeable rock or unconsolidated materials (gravel, sand, silt or clay) from which groundwater can be extracted using a water well. Azimuth

A unit of volume measurement used for petroleum and its products or water used or produced by the industry (1 barrel = 42 gallons).   Barrel of oil equivalent (BOE)

One billion cubic feet of natural gas. BCFE

  When well pressure exceeds the ability of the wellhead valves to control it. BOED

The hole in the earth created when drilling a well. Brine

The heat required to raise the temperature of a one-pound mass of water by one degree Fahrenheit. Butane