a tube Each of the above is an annulus: a gluing diagram of an annulus, a ring, and a tube
(1) That space between a drill pipe and the formations through which the drilling fluid (mud) returns to the surface (2) The space between tubing and casing or between casing and formation (3) A ring of interstitial water produced by invasion processes in hydrocarbon-bearing beds when both hydrocarbon and interstitial water phases have mobility and their mobilities are different When Rxo > Ro the annulus will be more conductive than the flushed zone (Rxo) or the uninvaded oil-bearing zone (Rt) When Rxo < Ro, the resistivity of the annulus will be intermediate between that of the flushed zone (Rxo) and the uninvaded oil-bearing zone (Rt)
A ring of tough fibrous tissue at the base of the heart This ring supports and anchors the heart valve(s) into the heart itself There are 4 valve annuli one each for the tricuspid, mitral, aortic, and pulmonary valves These rings of fibrous tissue all converge together in the middle of the heart, and area known as the fibrous skeleton of the heart
A ring of tough fibrous tissue which is attached to and supports the leaflets of the heart valve
Blasthole Drill - The clearance in the drill hole between the drill pipe and the walls of the hole
A growth ring that is found on scales, opercula and in otoliths Like rings on a tree Counting of the rings can assist in determining the age of a fish and the number of times it has spawned
The skirtlike remnant of the partial veil which shields the lamellae as they produce the spores and protects the spores until they are ready for release It surrounds the upper part of the mushroom stem below the cap and sometimes slips down Not found on every mushroom Also called "annular ring "