Glossary - C

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Capex
Capital expenditure.

Casing string
The steel tubing that lines a well after it has been drilled.

CBT
Computer Based Training

Central estimate
A range of exploration drilling scenarios from which the following activity levels, based on recent historical experience, are adopted as the central estimates.

Christmas tree
The assembly of fittings and valves on the top of the casing which control the production rate of oil.

COGENT-SSC
Cogent Sector Skills Council.

Commercial field
An oil and/or gas field judged to be capable of producing enough net income to make it worth developing.

Completion
The installation of permanent wellhead equipment for the production of oil and gas.

Condensate
Hydrocarbons which are in the gaseous state under reservoir conditions and which become liquid when temperature or pressure is reduced. A mixture of pentanes and higher hydrocarbons.

Crane barge
A large barge, capable of lifting heavy equipment onto offshore platforms. Also known as a "derrick barge".

Cubic foot
A standard unit used to measure quantity of gas (at atmospheric pressure); 1 cubic foot = 0.0283 cubic metres.