长江中游岩石层首次定向钻穿越施工技术

First Pipeline Crossing with Directional Drilling Technique in Rocky Stratum of Middle Reaches of Yangtse River

结合仪征-长岭原油管道洪湖长江定向钻穿越工程实例,分析了管道定向钻穿越长距离岩石层的特点,论述了定向钻穿越岩石层的地层状况、钻具组合、控向措施、泥浆控制、钻进工艺以及导向孔钻进、扩孔、回拖阶段的应急预案,针对在钻导向孔过程中因泥浆压力高、信号线多次出现被高压泥浆冲坏、造成控向信号不稳定甚至中断的情况,对信号线的安装提出了改进措施。通过具体实施,在长江中游岩石层中首次采用水平定向钻技术穿越原油管道获得成功。

Associated with a practical example of pipeline crossing with directional drilling technique in Yizheng-Changling crude oil pipeline, this paper analyzes the characteristics of crossing through rocky stratum with directional drilling, deliberates the stratum status, drilling machine selection, drilling tool assembly, direction control, mud control; drilling process as well as emergency dealing scenarios at the stages of guiding-hole drilling, aperture expanding and back-towing. With concrete measures adopted, the pipeline crossing with directional drilling technique in rocky stratum of middle reaches of Yangtse River succeeded for the first time.