Research on the Controlled Grouting Process with SJP Cement Slurry for Plugging of Strong Water Gushing Borehole

Abstract:

On the background of practice of water gushing treatment in prospecting borehole in Yunnan Maoping lead–zinc deposit, the paper analyzes several treatment schemes according to the diamond drilling engineering practice with high water gushing pressure and large gushing flow. Based on the measured parameters of water inflow and water gushing pressure, controlled grouting technology is put forward. The paper discusses the basic composition of SJP cement slurry and the performance characteristics and controlled grouting technology, analyzes the relationship between the pressure at orifices and the circumstance of grouting slurry in borehole, and puts forward new concepts of “zero starting point”, “zero ending point” and h value in grouting pressure changing, as well as the way to determine the type of gushing-water tunnel by pressure change, etc. The research result has been successfully applied in 3 serious water gushing boreholes to ensure the smooth construction.