摘要: Directional drilling has provided the coal mining industry with a means to position in-seam boreholes achieve goals such as gas drainage, exploration and inrush protection. The evolution of technology progressed point where most operators use standard down-hole configuration which proven effective in applications. Survey techniques have been modified reduce distance between bit survey without consideration effects on accuracy, driller skills data collection. Data from two long is analysed show response curves configuration. An indication in-hole friction, feed pressures limitations put eventual borehole depths shown.
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