... 环形间隙 annular space 环形空隙 annular space 环形螺旋钻 annular auger ...
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环状圆柱形空隙 circular cylindrical void
环形空气隙 annular air gap
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与密度测井不同的是，其伽马射线源和探测器的布置方式能使它们对井内环形空隙中物质的密度很敏感，可以将套管外面的流体和水泥区分开来。
The source and detector, however, are arranged to be sensitive to the density of material in the annulus and can distinguish between fluid and cement behind the casing.
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