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我队于1973年进行磷矿普查，至1974年6月已施工完5个钻孔，对普查矿区的地层有了初步认识，并掌握了取芯的操作方法，工程质量逐步提高。普查区地层复杂，属云台组的上段锦屏含磷组，给钻探施工带来很大困难。普查区施工第一个孔，没有采取喷射式反循环钻具取芯，结果岩芯采取率仅有20％左右。换孔后，我们分析了岩性情况，决定打穿浮土后就使用喷射式反循环钻具钻进至终孔。岩层进尺共计208.53米，岩芯长167.17米，采取率为80.2％，达到一类孔。施工702孔时，我们使用单管
Our team carried out the phosphate rock census in 1973 and completed the construction of 5 bores until June 1974. We got a preliminary understanding of the strata of the census mine and mastered the operation method of coring. The quality of the project was gradually improved. The stratigraphic complex in the census area belongs to the Jinping P group in the upper segment of the Yantai Group, which brings great difficulties to the drilling and construction. Census area construction of the first hole, did not take jet reverse circulation drill coring, the results of the core rate of only about 20%. After the hole replacement, we analyzed the lithology and decided to drill into the final hole after using the jet reverse circulation drill to break through the floating soil. A total footage of 208.53 meters rock formation, core length 167.17 meters, taken rate of 80.2%, to a class of holes. When building 702 holes, we use a single tube