他们说，那个井室又窄又黑，里面还有许多损毁的设备。
They said the chamber was narrow, dark and full of mangled equipment.
延迟固井技术主要用在小间隙、窄环空井眼和一些特殊井的固井工艺中。
Delayed cementing technology is mainly used for cementing slim holes, Wells with small annular space and some special Wells.
窄间隙套管可有效增大固井间隙，有利于套管的下入和水泥封固质量的提高，具有重要的用途。
Small-clearance casing, playing an important role in cementing, can enlarge the effective cementing clearance, facilitate the casing running-in, and improve the cement bond quality.
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