rod pulling

It is necessary base on the imbalanced drilling theory to study the pull-out drilling technology for mine gas geology and to systematically study different accidents,tension proof drilling rods and right and left directional integrated bits for the drilling bore- holes.

在煤矿瓦斯地质钻探中,仅从加压钻进上来解决钻深和孔径的问题是不够的,要从非平衡钻探工艺理论基础来研究瓦斯地质起拔钻探工艺,通过系统地研究孔内各类事故、抗拉钻杆、正反向一体化钻头等问题,构建出新的钻探工艺体系。