annulusˈæn yə ləs; -ˌlaɪ
annulus (n)
English Definitions:
ring, halo, annulus, doughnut, anchor ring (noun)
a toroidal shape
"a ring of ships in the harbor"; "a halo of smoke"
annulus, skirt (noun)
(Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar
annulus (Noun)
A ring- or donut-shaped area or structure.
annulus (Noun)
The region in a plane between two concentric circles of different radius.
annulus (Noun)
Any topological space homeomorphic to the region in a plane between two concentric circles of different radius.
annulus (Noun)
The ring of the sun not covered by the moon in an annular solar eclipse.
annulus (Noun)
Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying.
annulus (Noun)
The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.
annulus (Noun)
The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.
Annulus
The annulus of an oil well refers to any void between any piping, tubing or casing and the piping, tubing, or casing immediately surrounding it. It is named after the corresponding geometric concept. 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. For a new well in the process of being drilled, this would be the void between the drill string and the formation being drilled. An easy way to visualise this would be to stand a straw straight up in the center of a glass of water. All of the water in between the straw and the sides of the glass would be the annulus, with the straw itself representing the drill string and the sides of the glass representing the formation. While drilling, drilling fluid is pumped down the inside of the drill string and pushes the drill cuttings up the annulus to the surface, where the cuttings are removed from the drilling fluid by the shale shakers. In a completed well, there may be many annuli. The 'A' annulus is the void between the production tubing and the smallest casing string. The A annulus can serve a number of crucial tasks, including gas lift and well kills. A normal well will also have a 'B' and frequently a 'C' annulus, between the different casing strings. These annuli do not normally have any connection to well bore fluids, but maintaining pressure in them is important in order to ensure integrity of the casing strings.
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