起钻遇卡(overpull: 超拉力) The formation is unstable. 地层不稳定 There are many return cuttings. 返出岩屑特别多 .
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The formation is unstable and the wall caving are severe.
地层不稳定，井壁垮塌严重。
In this paper, a new method is presented to define formation pressure in short-term closed-in pressure, which based on the research about theory of unstable well testing of fractal reservoirs.
通过分形油藏压力不稳定试井理论的研究，提出了一种使用短期关井压力数据确定地层压力的新方法。
It is shown that great progress has been made in recent years. The classification method of unstable wellbore formation, total consumption of mud additives in China onshore oil fields are given.
指出在近几年上述几方面都取得了长足的进步，还分别按处理剂种类、处理荆原材料种类分析了中国陆上石油工业使用的处理剂种类和消耗总量。
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