Drilling Method for Hard and Slipping Formation in Western Hubei

Abstract:

In host strata of phosphate rock, lead-zinc mine, silver and vanadium ore and overlying strata of western Hubei, there is common existence of hard rocks. Sinian dolomite contains a large amount of silicon horizon and “chalcedony” layer formed by chemical vapor deposition, silicon content is more than 80% with dense structure, low abrasiveness and drillability of Ⅸ～Ⅹ level. By the test in drilling field, the paper described the diamond bit selection, artificial bit conditioning and diamond drilling process parameters selection; summed up the successful experience in construction practice for further resolving drilling slipping difficulty.