These new equipments can bring higher drilling rate, lower drilling cost and remarkable economy benefits.
采用这些新设备可提高钻井速度，降低钻井成本，经济效果显著。
Optimizing wellbore trajectory design is the key link to ensure the quality of well bore, decrease accidents in well hole and lower drilling cost.
优化井眼轨道设计是保证井身质量，减少井下事故，降低钻井成本的关键环节之一。
But the cost of drilling is high, and the electric or shallow seismic explorations are limited by layer media and have lower precision.
钻探成本高，浅震和电法都存在有层状介质的局限性及勘探精度的问题。
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