Lost circulation can be one of the more serious problems that can arise during the drilling of an oil well or gas well. Circulation is said to be lost when the drilling fluid, known commonly as "mud", flows into one or more geological formations instead of returning up the annulus.
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Famous quotes containing the words lost and/or circulation:
“Our concern for the loss of our friends is not always from a sense of their worth, but rather of our own need of them—and that we have lost some who had a good opinion of us.”
—François, Duc De La Rochefoucauld (1613–1680)
“The denunciation of the young is a necessary part of the hygiene of older people, and greatly assists the circulation of their blood.”
—Logan Pearsall Smith (1865–1946)