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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地层不稳定，井壁垮塌严重。
如何控制陆相地层横向不稳定性，是盆地分析的难点。
The difficulty for analysing basin sedimentation is how to control the horizontal variation of continental strata.
主要研究分析了元素硫在地层中沉积的预测模型的建立以及含硫气井的不稳定试井解释方法。
Mainly studied the prediction model of sulfur deposition in the stratum and transient well test of sour gas well.
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