e/Annulus (oil well)

Information
has gloss	eng: The annulus (yellow area in diagram) of an oil well refers to any void between any piping, tubing or casing and the piping, tubing or casing immediately surrounding it. The presence of an annulus gives the ability to circulate fluid in the well, provided that excess drill cuttings have not accumulated in the annulus preventing fluid movement and possibly sticking the pipe in the borehole.
lexicalization	eng: annulus
instance of	c/Oil wells

Media
media:img	Annulus.jpg