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多年来，我部砂钻地质描述一直是根据抽筒抽出的砂样进行的，其弊病，一是砂样层次混淆，层厚不准，不能直接观察到原始层位；二是因抽筒样冲击时破坏了地层结构，造成金粒下沉和“旁挤”。至使含金层厚度增大，品位降低。为此砂钻半合管取样钻具于1985～1986年，先后在黑龙江省数处进行野外试验，初步取得了较好效果，深受地质和施工人员欢迎。现将试验效果介绍如下。
For many years, the geological description of the sandstone in our department has been carried out according to the sand samples extracted from the barrel. The disadvantages are as follows: firstly, the layer of sand sample is confused, the layer thickness is not accurate, and the original layer can not be directly observed; Impact destroyed the formation structure, resulting in gold sinking and “squeeze.” To increase the thickness of the gold layer, grade lower. For this reason, the semi-co-sampling drill bit of sand drill was used from 1985 to 1986 in succession in field experiments in Heilongjiang Province. The preliminary results were good and well received by geology and construction workers. The test results are described below.