Directional drilling technique for a large diameter filling hole in complicated formation in Xiangxi Gold Mine

Abstract:

In view of the deep and high dip strata in Xiangxi Gold Mine, where the traditional deviation prevention methods, such as the packed hole drilling string, the pendulum drilling string, cannot guarantee the borehole verticality , the mud motor was used with MWD for the first time to drill a pilot hole, and then pneumatic DTH drilling to quickly ream it to the large diameter filling borehole, achieving good results. The mud motor can provide better directional drilling with the deviation controlled within 8.67m.