Simulation method on directional drilling - hole course 定向钻孔轨迹的模拟方法
2.
Research on technology and equipment of controlled directional borehole for drawing out of gas from coal mine 抽放瓦斯定向钻孔施工技术的研究
3.
Construction of directional drilling hole is the key . slop prepare is the important ensuring of back - dragging successfully 定向钻孔的施工是关键,泥浆配备是回拖铺设成功的重要保证。