伊朗北阿首口双分支井AZNN-022井眼轨道设计与控制

伊朗北阿油田自2011年进入了整体开发阶段,以savark3为目的层,钻成了大量水平井。已完钻的水平井井深均在4 000 m以上,平均钻井周期3个月以上。为了提高单井采收率,缩短钻井周期,部署第1口双分支井AZNN-022井,该井分支井眼的完钻层位与主眼不同,且水平偏移距短,曲率设计高,防碰施工难度大。采取开窗位置优选、轨道优化设计、精确轨迹控制、防碰扫描技术等措施,成功解决了上述难题,顺利地钻完分支井眼,实现了井下安全。这对于该区块的后续双分支井施工和斜井段开窗侧钻井的施工具有重要的借鉴意义。

Well path design and control of the ifrst double branch well AZNN-022 in Iran North Azadegan Oilifeld

Iran north Azadegan Oilfield entered integrated development stage in 2011, and a number of horizontal wells have been drilled targeted at Savark 3. The average depth of the drilled horizontal wells is over 4 000 m, and average drilling period was over 3 months. In order to improve oil recovery of single wells and shorten drilling period, the first double branch well AZNN-022 was planned. The final zone of the holes of this branch well is different from the target of the main hole, and its horizontal offset is short, its curvature is designed as high and it is difficult to prevent collision during drilling. This paper successfully addressed the above difficulty by optimizing the window cutting location, optimized trajectory design, accurate control of the trajectory, and anti-collision scan. The branch holes were successfully drilled and downhole safety was realized. This is of great guidance significance to subsequent drilling of double branch wells and sidetracking drilling in the deviated hole.