抗高温硅酸盐钻井液体系室内研究

Laboratory Study on High Temperature Resistance Silicate Drilling Fluid System

硅酸盐钻井液在解决井壁失稳问题具有突出优势,但目前对硅酸盐钻井液体系在高温条件下的研究较少,制约着硅酸盐钻井液体系的推广应用。通过硅酸盐、高温流变调节剂、降失水剂及pH稳定剂等单剂的筛选,最终确定硅酸盐钻井液体系配方,并进行了性能评价。结果表明:所研究的硅酸盐钻井液体系可以抗170℃高温,体系流变及高温高压失水均可满足需求;体系具有较好的抗钻屑、海水及盐污染的能力,侵污前后流变相差不大;该硅酸盐钻井液体系具有较好的抗温性能和抗搬土污染性能。

Silicate drilling fluid has outstanding advantages in solving the problem of wellbore instability.However,there are few studies on silicate drilling fluid system under high temperature conditions,which restricts the popularization and application of silicate drilling fluid system.Through the screening of single agents such as silicate,high temperature rheology modifier,fluid loss reducer and rheological stabilizer,the formula of silicate drilling fluid system was finally determined and the performance was evaluated.The results showed that the silicate drilling fluid system could resist high temperature of 170°C,and the system rheology and high temperature and high pressure water loss met the drilling demand.It could resist 15%of soil pollution,and the rheology before and after pollution was not much different.The silicate drilling fluid system has good temperature resistance and resistance to soil contamination.