... bare engine 没有任何辅助设备的发动机 bare hole 无套管的井；裸眼 bare land 原野 ...
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无接箍式套管靠管体两端的螺纹连接，所以套管外径尺寸小，可增大环形间隙，便于套管下入和提高固井质量。
It connects with threads on both ends of pipe body, which allows a smaller casing O. D. and increases annular gap to facility casing running in and improve cementing quality.
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