High angle borehole drilling in Jingcun Gold Mine

Abstract:

The geological borehole is often designed as a largeangle hole to achieve the purpose of prospecting and orecontrolling according to the stratum and ore body characteristics of the Jingcun gold deposit in Deqing County, Guangdong Province; thus leading to excessive doglegs in drilling. The borehole deviation rule and characteristics were summarized through collecting and summarizing the early drilling data in the mining area, and primary directional drilling was applied together with “one mother hole with multiple laterals”, resulting in good effect with the excellent drilling quality, improved drilling efficiency, and significantly reduced drilling construction costs. The article focuses on the primary directional drilling design and the dogleg severity control during the drilling process. It proposes a solution to the problems encountered in the drilling, and some experiences and understandings of drilling of large angle holes are summarized.