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我们根据三一三队某铅锌矿区风化白云岩（疏松）矿层，用其它钻进方法，容易造成矿心品位贫化问题，设计了一种直径89毫米，分节活动式单动双管钻具。经过四个钻孔62个回次的生产性试验，钻进风化白云岩地层时，保持了岩（矿）芯原生造构，减少了矿心品位贫化程度，提高了钻进速度。钻进5—7级岩石时，平均岩（矿）芯采取率达到88％以上。平均小时效率达到2.2米，比双动双管钻进的平均小时效率，提高了0.7米，取得了较好的试验效果。如试验的ZK31—1孔，由孔深94.40—104.17米为风化软质（疏松）矿层，取上来的矿心，保持了原生结构，化验品位达到3.4％，比临近ZK32—4孔（30米远），用双动双管钻进的矿层1.5％的品位，提高了1.9％，受到了领导、地质人员和工人同志的好评。现将钻具试验情况简介如下。
Based on the weathered dolomite (unconsolidated) ore deposit of a Pb-Zn mining area in the San-13 team, with other drilling methods, it is easy to cause the problem of depletion of the ore grade. A 89mm-diameter, With. After drilling production tests for 62 times in four boreholes, the original structure of the rock (ore) core was maintained when drilling into weathered dolomite formations, reducing the degree of depletion of ore cores and increasing the drilling rate. When drilling rocks of grade 5-7, the average rock (ore) core takeover rate is above 88%. The average hourly efficiency of 2.2 meters, double the average double-acting than the average hourly efficiency, increased by 0.7 meters, and achieved good results. Such as the test ZK31-1 hole, the hole depth of 94.40-104.17 meters for the weathered soft (loose) ore, take up the core, maintaining the native structure, laboratory grade reached 3.4%, near the hole ZK32-4 (30 meters Far). The 1.5% grade of the ore bed that was double-action double-pipe drilling increased by 1.9% and was highly praised by leaders, geologists and workers. Now drilling test conditions are as follows.