Coring Drilling Technology in Fracture Zone

Abstract:

In the detailed exploration of Liziping lead-zinc mine in Yunnan Province, because the formation fracture zone is developed, the core recovery rate is very low by using the wire-line coring drilling, which can not meet the design requirements. By the technical measures of design of diversion bottom jetting drill bit and the supporting flushing fluid and adjustment of drilling parameters, good results were achieved to ensure the engineering quality.

Key words:fracture zone; core recovery rate; diversion bottom jetting drill bit