BH-114型套管钻进在福建马坑铁矿复杂地层中的试验应用研究

介绍了BH-114型套管钻进工艺在福建马坑铁矿ZK9501孔复杂地层中的试验应用情况。试验表明，采用D114mm套管代替绳索取心钻杆传递钻压和扭矩驱动孔内套管取心钻具回转钻进，用绳索取心打捞原理，在不提钻情况下进行绳索取心钻进，检查或更换孔底主、副钻头，实现不提钻头取心钻进到预定孔深，有效穿越复杂地层，减少起钻次数，避免因起钻次数多而导致孔内孔壁不稳定及其引发的孔内事故，降低劳动强度，改善施工环境和促进安全生产。

Study on Experimental Application of BH-114 Casing Drilling in Complex Formation of Makeng Iron Ore of Fujian

The paper introduces the experimental application of BH - 114 casing drilling for hole ZK9501 in the complex formation of Makeng iron ore of Fujian. In the experiment, the WOB and torque were transferred by 0114mm casing instead of wire-line drill rod to drive the casing coring tools and based on the wire-line coring catching principles, core drilling was carried out and the main and auxiliary bits were replaced without drill string lifting until drilling across the complex formation to the determined depth. The wall instability caused by drill string lifting and downhole trouble were avoided to reduce the labor intensity, improve the construction environment and promote safe production.