Application of Solid-free Flushing Fluid for Wire-line Coring in Complex Metamorphic Rocks Formation

Abstract:

A super graphite deposit in Beizhen Dutun of Liaoning Province exists in metamorphic series. The genesis and characteristics of complex metamorphic formation were analyzed in this regional exploration and wire-line coring drilling and solid-free flushing fluid drilling technologies were used. By the analysis on the effect of flushing fluid on the stability of graphite rock seams, the flushing fluid system is optimized; the wall protection mechanism of flushing fluid is also analyzed and the technical countermeasures in drilling process is optimized to solve the problems of slurry cake and intermediate casing application. The deposit exploration is successfully completed with good technical and economic results obtained.