core grouting
... rock grouting 岩石胶结酌 core grouting 岩心卡住 soil grouting 土的水泥稳定法 ...
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当岩心筒在井下被卡住时，很容易地从安全接头螺纹处倒开，起出内筒和岩心，只留下外筒进行打捞。
When coring barrel gets stuck downhole, it is very easy to back off safety joint to trip out inner barrel and cores, and only left outer barrel for fishing operation.
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