Construction Practice of Drilling in Complex Formation of Gold Field in Gansu

Abstract:

According to the difficulties of broken formation, fracture development, lost circulation, callapse, drill rod sticking and burying in Xihedaqiao gole field, diamond swivel type double tube drilling technology and borehole protection with polyacrylamide non-dispersive low solid washing fluid were adopted with several leakage control measures, good technical effects were received. The paper summed up the construction experience in complex formation of this gold field.