Western oil majors have recently reported a rise in the drilling failure rate.
西方石油大鳄们最近报告说钻探失败率在上升。
The experiment shows the technique possessing high core recovery rate and quick drilling speed.
试验表明，该技术方法具有岩芯（样）采取率高、钻进速度快的特点。
The experiment shows the technique possessing high core recovery rate and quick drilling speed.
试验表明，该技术方法具有岩芯（样）采取率高、钻进速度快的特点。
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