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井壁稳定是钻井工程中经常遇到的一个问题,井壁失稳会造成井下复杂情况,影响钻井施工进度,严重时可能会导致井眼报废,造成巨大经济损失。延长气田位于鄂尔多斯盆地伊陕斜坡东南部,该地区钻遇地层多,岩性变化大,上古生界石千峰、石盒子坍塌掉块严重,起下钻遇阻、遇卡现象较多,井下复杂及事故频发[1]。因此,井壁稳定技术及合理钻井液密度值显得尤为重要。
Wellbore stability is one of the most frequently encountered problems in drilling engineering. The instability of the wellbore wall can cause complex conditions in the well and affect the progress of drilling construction. In severe cases, the wellbore may be scrapped, resulting in huge economic losses. The Yanchang gas field is located in the southeast of the Iraqi-Shaanxi slope in the Ordos Basin. There are many strata encountered in this area, and the lithology changes greatly. The Shiqianfeng block in the Upper Paleozoic was seriously collapsed and collapsed. And frequent accidents [1]. Therefore, the wellbore stability technology and reasonable drilling fluid density values are particularly important.