Formation fluid

Formation fluid refers to the naturally occurring liquids and gases contained in geologic formations.[1] Fluids introduced during the drilling process are called drilling fluids.[2] Fluids in an oil or gas reservoir are called reservoir fluids.[1] The fluids flowing from the wellhead of an oil or gas well are called production fluids.

References
  1. Schlumberger Oilfield Glossary - Formation fluid
  2. Schlumberger Oilfield Glossary - Drilling fluid
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