SAGD双水平井入靶控制技术　　

Target-entering control technology for SAGD parallel horizontal well drilling

章敬 易灿 张龙 马立君

ZHANG Jing YI Can ZHANG Long MA Lijun

Development Company, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China Beijing Cavaville Energy Service Ltd., Beijing 100101, China

Development Company, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China Beijing Cavaville Energy Service Ltd., Beijing 100101, China

水平段的水平度和上下2口井水平段的平行度是SAGD双水平井钻井的两项关键指标，为了控制这两项指标，必须对入靶点处井斜及井眼方向进行有效的控制，否则将会增大水平段轨迹控制难度和工作量，给施工带来不利影响，并且影响原油采收率。在理论推导入靶控制平均造斜率范围的基础上，分析了入靶控制的影响因素：造斜率、方位及磁干扰，提出了SAGD平行水平井入靶井斜角确定原则及对轨迹控制出现各种情况的处理方法。理论分析和实践表明，实钻轨迹点的位置接近或少量滞后于设计轨道，并保持井斜角适当超前，更有利于水平井的着陆。研究结果对SAGD双水平井入靶轨迹控制技术具有重要参考作用，对今后采用SAGD双水平井方式大规模开发稠油油藏具有指导意义。

Horizontality of horizontal sections and parallelism between horizontal sections of two horizontal wells are two key indexes in SAGD parallel horizontal well drilling. In order to ensure the high quality of these indexes, the deviation angle at the target entry point and the borehole direction have to be effectively controlled. Otherwise, the trajectory control of horizontal section would become more difficult and the workload would be increased, which has negative influence upon operation and recovery of crude oil. Based on deriving the range of average build-up rate in target-entering control, the influence factors were analyzed, including build-up rate control, azimuth control and magnetic disturbance. Principle for deciding target-entering deviation angle in SAGD parallel horizontal well drilling and approaches of trajectory control for different conditions were proposed. Theory and practices have proved that it is better for the landing of horizontal well when making the deviation angle in advance appropriately and the position of actual track points are near or a little bit behind that of designed trajectory. The research results have directive significance for target-entering controlling technology in parallel horizontal well drilling and large-scale development of heavy oil reservoir with SAGD.