The technique of primary drilling and blasting is an effective way to solve the problem of crushing, caving and transportation.
该方法的初采钻爆技术是解决顶煤破碎与顺利放出的有效途径之一。
Petroleum drilling, called "the pioneer of petroleum industry", is one of the primary engineering during petroleum exploration and development.
石油钻井工程是进行石油天然气资源勘探开发的主要工程，被誉为“石油工业的火车头”。
The technology of hole trajectory primary sect ion is the key of drilling in re entry horizontal Wells.
侧钻水平井轨迹起始段工艺技术，是侧钻水平井钻井工艺的关键技术。
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