Appraisal well : Drilled after the discovery of oil or gas to establish the limits of the reservoir, the productivity of wells in it and the properties of the oil and gas.
Barrel : A unit of volume measurement used for petroleum and its products (7.3 barrels = 1 ton: 6.29 barrels = 1 cubic meter).
Blow-out : Accidental escape of oil and gas from a well during the drilling stage.
Compressor : An engine used to increase the pressure of natural gas so that it will flow more quickly through a pipeline.
Decommissioning : A removal of production equipment and facilities from depleted oil fields.
Development well : Drilled to produce oil and gas after an appraisal well has proved the reserves sufficiently large for exploitation.
Down hole : A term used to describe tools, equipment and instruments used in the well bore, or conditions or techniques applying to the well bore.
Downstream : The refining, distribution and marketing of petroleum products.
Exploration drilling : Drilling carried out to determine whether hydrocarbons are present in a particular area or structure.
FPSO : Floating production storage and offloading.
Exploration phase : Covers the search for oil or gas by carrying out detailed geological and geophysical surveys followed up by exploratory drilling.
M BOE : Million barrels oil equivalent.
Midstream : Refers to industry activities that fall between upstream and downstream activities. Most often applied to pipeline transportation of crude oil and natural gas.
Mud : A mixture of base substance and additives used to lubricate the drill bit.
Operator : Company that has legal authority to drill wells and undertake production of hydrocarbons.
Platform : Fixed structure resting on the seabed or piled into it from which development wells are drilled, to exploit an oil or gas field.
Plateau level : The level of peak production reached by an oil or gas field.
Tour : Work shift of a drilling crew, usually pronounced as though it were spelled t-o-w-e-r.
UKCS :
Upstream : The exploration for, and extraction of, crude oil and natural gas.
Wildcat : Speculative exploration well drilled in search of a new oil or gas accumulation.
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