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我队二号机自81年搬至较复杂的地层进行金刚石钻进后，效率和钻头寿命都大幅度降低。经分析，除管理工作外，主要原因是岩层破碎堵心所致。
After our team II aircraft moved to the more complex formations for diamond drilling from 1981, the efficiency and bit life are significantly reduced. The analysis, in addition to management, the main reason is due to broken rock plugging heart.