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我队从一九七三年以来，使用“长短双管”在风化松软的岩矿层中钻进，岩矿心的采取率均比普通“双动双管”有显著的提高，但“长短双管”也只能配成“一长、一短”两套钻具使用。然而由于客观情况是多变的，为了适应其变化，我们在“长短双管”的基础上，改制成“伸缩双管”，以便随地层风化松软程度而任意调整内管的伸出量，这套钻具使用效果较好。
Since 1973, our team has used “long and short double tubes” to drill in weathered rock and rock formations, and the rock and core take-up rates have significantly increased compared with the ordinary “double-action and double-tube” Tube “can only be assigned to” a long, short “two sets of drilling tools to use. However, due to the objective situation is changing, in order to adapt to changes, we based on the ”double length“, the restructuring into a ”telescopic double tube" in order to make the degree of formation of the formation of softness and arbitrarily adjust the extension of the inner tube, which Sets of drilling tools to use better.