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coalbed methane preliminary prospecting well
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coalbed methane preliminary prospecting well
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煤层气勘查
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coalbed methane preliminary prospecting well
煤层气预探井
采用低固相或无固相等对煤层污染少的低密度钻井液钻取煤层,采用绳索取心或保压取心技术采取煤心,测试煤层含气量的、专门施工的工程井。
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