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Barrel

A unit of measure for crude oil and oil products equal to approx. 160 litres.

Basin

A synclinal structure in the subsurface (concave upwards) of large area extent.

Bed

A recognisable sedimentary rock layer.

Bit

The cutting or pulverising tool attached to the lower end of the drill string boring a hole in underground formations.

Block Valve

A large heavy-duty valve on a crude oil or products trunk line installed usually at intervals of from 8 to 32 kilometres. These valves can be used to isolate sections of the pipeline in an emergency and are called "block valves". The block valve and its fenced compound is know as a block valve station.

Blowout Preventer

A stack or assembly of heavy duty valves to the top of the casing to control well pressure.

Bottom-hole Pressure

The reservoir or formation pressure at the bottom of the hole.

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