Drilling Construction Method for Polymetallic Deposit in Complex Formation of Nanping Mining Area

Abstract:

There were difficulties of broken formation, poor cementation, circulation lost and collapsing in Nanping mining area, and several boreholes could not reach the designed depth. By attempts of washing fluid selection, borehole structure simplification and drilling technology improvement, the scrap ZK474 and ZK477 were displaced and reconstructed with success. The paper mainly introduced the wall protection and leakage control measures.