乌拉尔地质局沃龙卓夫地质勘探队进行大量的砂金和砂镍的勘探工作。为此，广泛地应用无泵钻进，这种钻进方法能获得较高的取样质量和减少繁重的坑探工作。但是，在泥质岩层占50％的钻孔中无泵钻进时，强烈地挤塞岩心。在一个回次后从岩心管中取出挤塞的粘性岩心是极其困难的。 Ural Geological Bureau Wo Long Zhuofu geological prospecting team for a large number of placer gold and sand nickel exploration work. To this end, the widespread use of pump-less drilling, this drilling method to obtain higher sampling quality and reduce the heavy pit exploration work. However, when 50% of the argillaceous formation is drilled without drilling, the core is strongly congested. It is extremely difficult to remove the congested sticky core from the core pipe after a single pass.