n. annulus
misc. annular space
... angular ring 圆环 annulus 环隙 annulus between layers and nozzle neck 层板和接管颈部之间的环隙 ...
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但是在严重的情况下，微环隙可围绕整个套管圆周。
However, in severe cases the microannulus may encircle the entire casing circumference.
模型中包括射孔孔眼、套管、水泥环、油层、微环隙和横向裂缝。
The model consists of perforation, wellbore, cement casing, oil layer, micro-annulus and transverse fracture.
根据环隙科特流理论导出了滑动轴承偏心环隙的单位宽循环流量公式。
The paper derives the unit discharge formula of a journal sliding bearing according to the theory of Couette flow between two concentric cylinders.
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