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一、概述我公司三○三队某探区的白色、灰白色、深灰色白云岩具有层理发育、性脆、易破碎和软硬不均的特点。其岩石可钻性为6—7级。过去,曾以单管正循环钢粒钻进与双管双动合金钻进方法交替使用。前者回次进尺较高,岩心磨耗较大。取心率较低。后者因岩心破碎与完整、软硬交错的变化频繁,致使操作困难,取心率也不高。特别是钻进矿层回次只能打0.2
I. Overview White, gray and dark gray dolomites of a certain exploration area of 303 Groups of our company have the characteristics of stratified development, brittleness, fragility and unevenness of hardness. Its rock drillability is 6-7. In the past, had a single tube is recycled steel ball drilling and double-acting double-acting alloy alternately. The former came back higher footage, core wear larger. Coronary heart rate is lower. The latter due to broken and complete core, hard and soft staggered changes frequently, resulting in difficult operation, heart rate is not high. Especially drilling into the mine back only 0.2 times