我队勘探的宣龙式赤铁矿，因节理裂隙非常发达，特别是钙质砂岩和条带砂岩破碎更为严重。在钻进中泥浆完全漏失，孔内无一点水位。虽然把泥浆粘度加大，并采用黄土、锯末、石灰乳泥浆等办法堵止，都不能收效，堵漏水的时间估 The Xuanlong-type hematite explored by our team is very serious due to the joint and fissure developed, especially the calcareous sandstone and banded sandstone. In the drilling mud completely lost, no water level hole. Although the mud viscosity increases, and the use of loess, sawdust, lime mud and other means to stop, can not be effective, plugging the water time estimate