Optimization of deep mine water inrush point plugging scheme based on directional drilling technology

With the increase of mine development depth, the problems such as high difficulty in plugging deep water inrush points and large quantities of work have become increasingly prominent. The surface multi branch horizontal directional drilling technology is an effective means to solve the above problems, and its construction technical difficulties are mainly well trajectory control, well wall stability control and grouting effect improvement. Based on the above problems, taking Wucun Mine in Jiaozuo Mining Area as an example, the optimal plugging scheme for water inrush points is proposed. The structure of PDM drill is improved by adding eccentric cushion block to improve the control of well trajectory; the potassium ammonium based polymer drilling fluid system is used to optimize the proportioning scheme of the treating agent to improve the wellbore stability control; variable frequency speed regulating grouting pump and secondary mixing process are adopted to improve the grouting effect. The results show that the maximum drop of water level in Wucun Mine shaft is 6.53 m after the completion of the project, and the water blocking effect is significant.