论文部分内容阅读
丹江口枢纽片岩区,岩石层理发育,有数层破碎带,且多为糜稜岩,倾角一般为55～60°,岩心很难采取。过去曾用过花管于钻,双层岩心管等特殊取心钻具,效果均不显著,岩心获得率一直未超过50％。我队针对这种岩石怕水、提动钻具易遭损坏等特点,研究试用了外冲洗式钻具,岩心获得率提高到70％以上,并能在破碎带中取原状结构的样品。一、钻具结构钻具分为上下两部,用一变丝接头联接。上部是沉淀管和双层管子,外管直径为127毫米,内管直径为108毫米;下部为单层岩心管,装有合金钻头,直径为130毫米。水从上部127、108管子间隙中射出,下部不进水。详细结构及冲洗液循环路见图1。
Danjiangkou hinge rock area, the rock layer development, there are several layers of broken belt, and mostly mylonites, dip angle is generally 55 ~ 60 °, the core is difficult to take. In the past, spent tubes were used on special coring tools such as drills and double-layer core pipes, and the results were not significant. The core yield did not exceed 50%. In view of the fear of water and the vulnerable drilling tools, our team tried to use external flushing tools to improve the core yield to more than 70% and to take samples of the original structure in the crushing zone. First, the drill structure Drill is divided into two parts, with a variable wire connector connection. The upper part is a precipitated pipe and a double pipe with an outer pipe diameter of 127 mm and an inner pipe diameter of 108 mm. The lower part is a single-layer core pipe with an alloy drill and a diameter of 130 mm. Water emerges from the tube gap in the upper part 127, 108 without water entering the lower part. The detailed structure and rinse solution circulation is shown in Figure 1.