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In oil or gas well drilling, lost circulation[1][2][3] occurs when drilling fluid, known commonly as "mud", flows into one or more geological formations instead of returning up the annulus. Lost circulation can be a serious problem during the drilling of an oil well or gas well.
- ^ Petroleum Engineering Handbook, Volume II: Drilling Engineering. Society of Petroleum Engineers. 2007. pp. 100–101. ISBN 978-1-55563-114-7.
- ^ Drilling engineering. Heriot watt university. 2005. pp. 214–215.
- ^ Rabia, Hussain (1986). Oilwell Drilling Engineering : Principles and Practice. Springer. pp. 284–287. ISBN 0860106616.