水化对泥页岩力学性质影响的实验研究

在井眼失稳机理分析的基础上,经室内实验得出泥页岩水化后岩石力学参数的变化规律。页岩水化前后坍塌压力对比结果表明,水化使泥页岩的坍塌压力持续升高,证实了泥页岩地层在钻遇初期稳定、裸眼一段时间后出现失稳。 

Laboratory Study on Effect of Hydration to Shale Mechanics

On the basis of analyses of wellbore unstability mechanism, the changing law of shale mechanics parameters was established after shale hydration by the experimentation. The results from contrasts of collapsing pressures between unhydrated shale and hydrated one indicate that collapsing pressure for shale which behaves poor water sensitivity can be increased on a large scale, and verify the phenomenon exists that shale is stable in early contact with drillng fluid and turns out to be unstable later.