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and the formation being drilled. An easy way to visualise this would be to stand a straw (purple in diagram) 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 (yellow area in diagram), with the straw itself
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interventions, the void between the coil and the production tubing can also be considered an annulus and be used for circulation.
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and each other, connections allowing the flow of fluids between them may sometimes occur, due to either
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have not accumulated in the annulus, preventing fluid movement and possibly sticking the pipe in the
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and the piping, tubing, or casing immediately surrounding it. It is named after the corresponding
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In a completed well, there may be many annuli. The 'A' annulus is the void between the
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or wear and tear. There is said to be "communication" between these connected annuli.
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For a new well in the process of being drilled, this would be the void between the
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Though all annuli in a completed well are expected to be isolated from the
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up the annulus to the surface, where the cuttings are removed from the
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is pumped down the inside of the drill string and pushes the
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57:adding citations to reliable sources
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294:Oilfield Glossary: Term 'annulus'
151:is any void between any piping,
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109:February 2010
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