胜利油田页岩油水平井钻井液技术

胜利油田在罗家地区部署多口页岩油水平井。页岩与常规砂岩储层不同，页岩中含有膨胀矿物且微裂缝发育，当钻井液进入地层后，与黏土矿物、微裂缝发生综合作用，井壁极易不稳定。因此，对于页岩油水平井，井壁稳定是其施工主要难点。在对胜利油田罗家地区页岩矿物成分和裂缝分布情况分析的基础上，开展了钻井液井壁稳定性评价实验，证明了油基钻井液更有利于页岩井壁稳定。通过钻井液体系优选研究，确定了油基钻井液配方。渤页平1井现场试验证实该体系能够满足胜利油田页岩油水平井钻井施工需要。

Drilling fluid study on horizontal wells for shale oil reservoirs in Shengli Oilfield

Shengli Oilfeld deployed several horizontal wells for shale oil in Luojia area. There are some differences between shale and ordinary sandstone formations, for example, the shale has abundant swelling minerals and developed microcracks. After entering the formation, the drilling fluid will generate comprehensive effect with clay minerals and microcracks, leading to wellbore extremely unstabilized. Therefore, for shale oil horizontal wells, hole stability is very important. Based on the analysis on shale fracture distribution and mineral composition in Shengli Luojia area, evaluation experiments for drilling fluid hole stability have been conducted, which proved the shale hole stability benefit from oil based drilling fluid. This research has confirmed the shale oil horizontal well drilling fluid systems by means of optimization study. Used in BoYe-H1 well successfully, this system is proved to meet the drilling construction need of drilling orizontal wells for Shengli shale oil formation.