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双管送水干鑽器经我队实际使用証明,在半破碎或硬碎岩层鑽进中,是保証岩心采取率的一項有效方法。現將我們初步总结的具体使用方法介绍如下,供各單位参考。
The double-pipe water-dry drill has proved by our team’s actual use that it is an effective way to ensure the core take rate in the semi-broken or hard-rock formation drilling. Now we initially summarize the specific use of methods described below for reference for all units.