High performance drilling fluids with submicron-size particles as the weighting agent

摘要: Methods and compositions utilizing a drilling fluid comprising sub-micron precipitated barite having weight average particle diameter below about 1 micron. include method circulating in well bore, wherein the comprises: carrier fluid; weighting agent that comprises micron are disclosed. In some embodiments, may comprise an invert emulsion. has size distribution such at least 10% of particles have 0.2 micron, 50% 0.3 90% 0.5