当井口偏移距较小时，直线法和折线法求取的层速度和地层真速度吻合；
When the offset distance is smaller on the wellhead, the layer velocity obtained with straight line and the refraction line is matched with that of actual formation velocity.
能量法岩石可钻性测定系统是通过采集钻井井口岩屑并利用微机来测定岩石的可钻性。
By sampling the drill cuttings and using a microcomputer at the well site, the rock drillability can be determined by the energy law measure system.
采用迭代法逆循环计算方法，计算井口压力和井口气液排量。
The pressure and flow rate of fluid in well head were calculated using iteration.
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