thimble casing windows and sidetrack drilling is an new effective drilling measure in improving the oil recovery ratio by using reject well hole to dredge up the oilfield potential thoroughly.

• 套管开窗侧钻[1]是一种有效利用油田事故老井眼,深入挖掘油藏开发潜力,进一步提高采收率的行之有效的新型钻井技术。