Research and field application of oil-based drilling fluid in deep well of Beibu Gulf
In order to shorten drilling cycle and improve wall stability,the wall protection and anti-collapse performance of oil-based drilling fluid can be optimized by adding plugging agent.In this paper,nano-silica,n-aminoethyl-3-aminopropyl triethoxysilane and perfluorooctane trimethoxysilane were used as raw materials to prepare a nano-sized plugging agent.Its particle size was mainly distributed in the range of 10～200 nm,and its particle size was relatively concentrated.When applied to drilling fluid,it can reduce mud cake permeability,significantly improve the plugging performance of oil-based drilling fluid,and reduce filtration loss,which had little effect on reservoir permeability.Nanoscale plugging agent had good compatibility with oil-based drilling fluid and improved the stability of oil-based drilling fluid.The high-performance oil-based drilling fluid studied in this paper had been successfully applied to field drilling.During the drilling process,the addition of nano plugging agent had significantly improved the drilling speed and shortened the field drilling cycle.With the improvement of plugging performance,mud cake of drilling fluid had been effectively blocked in cracks and pores,and there was no falling block or peeling sheet on the well wall.
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