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在小口径金刚石钻探中,钻孔最小直径为46毫米。过去使用的电缆接头最大外径为42毫米,比测井探管外径还大,电缆接头与孔壁之间的间隙只有2毫米,很容易被碎石块卡在孔内。又因它的外径比较大,不能通过岩心管,一旦探管被卡在孔内,需要两次处理(即先处理接头,再处理探管),既给生产增加了困难,又耽误了钻进时间。
In small diameter diamond drilling, the minimum diameter of the hole is 46 mm. Cable connectors used in the past had a maximum outer diameter of 42 mm, which was larger than the outer diameter of the well logging probe. The gap between the cable gland and the hole wall was only 2 mm and was easily stuck in the hole with gravel. Because of its relatively large outer diameter, it can not pass through the core tube. Once the probe tube is stuck in the hole, it needs to be processed twice (ie, the joint is processed first and the probe tube is processed again), which increases the difficulty of production and delays the drilling Into time.