潜山井尾管反挤水泥固井工艺

REVERSE CEMENT SQUEEZING TECHNIQUE FOR LINER CEMENTING IN BURIED HILL RESERVOIR

在潜山地层钻井时，往往会发生恶性井漏和垮塌事故。为防止事故的发生，以前在进入潜山前即下入技术套管，然后强行钻完潜山井段，再悬挂一层尾管封隔技术套管鞋至潜山的泥岩地层，施工时垫石灰乳堵漏和尾管固井时都对油层造成严重污染。文中介绍了将尾管坐入潜山非主力油层，再利用潜山地层漏失进行反挤水泥固井。这样，既能达到封隔泥岩层的目的，又能避免尾管固井时水泥浆对油层的污染。

Some severe lost circulation and sloughing accidents occurred usually during drilling in buried hill reservoir. To prevent these accidents from occurrence,the intermediate casing was run immediately before getting into the buried hill reservoir. Then it was forced to finish drilling through buried hill Interval. Finally liner was hanged to isolate the shale interval from intermediate casing shoe to the buried hill formation. During operation, reservoir formation was damaged seriously by lime milk plugging and liner cementing. This paper presents a reverse cement squeezing technique which sets the liner in the non major buried hill reservoir and then cements the liner utilizing the lost circulation in buried hill interval. It can meet the requirement of shale interval isolation as well as minimize formation damage by cement slurry during liner cementing.