川西中江地区井壁失稳机理研究

Mechanism research of sidewall instability in Zhongjiang district in Sichuan

中江地区井壁失稳是该区钻探过程中普遍遇到的问题。为了弄清楚井壁失稳的机理，对该地区地层粘土矿物结构和理化性能及粘土矿物的膨胀、分散性能作了大量的室内研究，对易引起井壁失稳的一些工程因素也进行了比较全面的分析，为该区的防塌技术对策提供了依据。

During drilling, sidewall instability is often occured in Zhongjiang district. In order to make clear the mechanism of sidewall instability, plentiful indoor researches are done, including analysing structure and physicochemical property of clay mineral,and studying the expansivity and dispersion property of clay miner in Zhongiiang district. Some engineering factors which bring to sidewall instability are analysed in detail. It supplies some basements for hole sloughing prevention technique of Zhongjiang district.