Glossary

Delineation Well

A well drilled in an unproven area adjacent to a proven well to determine the extent of the reservoir; also referred to as a "stepout" well.

Distillation

Method of fractionation. Distillation is based on the difference in boiling point of the liquids in the mixture to be separated. Successive vaporisation and condensation of crude oil in a fractioning column will separate out the lighter fractions, leaving a residue.

Downhole

A term used in exploration and production to describe tools, equipment and instruments used in the well bore. Also, it refers to conditions or techniques applying to the well bore.

Downstream

All activities associated with the refining, marketing and transportation of petroleum products.