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水城队钻探技术员寒冰同志利用废岩心管改制双唇钢砂钻头,在钻进Ⅶ级以上硬脆岩层,与普通钻头比较,进尺效率提高11%-70%,平均提高21%,铁砂消耗量平均减少了30%,试验结果如下表:
Comrades from the Shuicheng Drilling Technician made use of the waste core pipe to rebuild the double grit grit drill bits. When drilling above grade Ⅶ and above, the efficiency of footage entry was improved by 11% -70% with an average increase of 21% The average reduction of 30%, the test results are as follows: