Early Exploration and Exploitation of the Yanchang Oilfield;
延长油矿的早期勘探与开采简述
In Yanchang oilfield, serious lost circulation often occur during drilling in Panlong and Zichang areas, directly affect drilling rate.
延长油矿管理局在蟠龙、子长等主生产区经常遇到严重漏失井,直接影响了钻井速度。
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