GLOSSARY

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a sulphate of barium used to add weight to drilling fluids

an oil field unit of volume. One barrel at standard conditions equals 158.9 litres

a dip in the earth’s crust usually filled or being filled with sediment. It is a basic concept in petroleum geology

a type of clay often added to drilling fluid because of its swelling properties when added to water.

the Bit is the part of the drilling equipment that cuts the rock in order to drill a hole

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