Nfluids Inc.

Maen Moh'd Husein

Geir Hareland

Mohammad Ferdous Zakaria

There is described a drilling fluid for wellbore strengthening having nanoparticles and granular particles. In one aspect described herein, the drilling fluid is an invert emulsion based fluid. In a further aspect, the nanoparticles are iron hydroxide or calcium carbonate, and in a further aspect from about 1 to 30 nm in size. In one aspect described herein, the granular particles are graphite or calcium carbonate and in a further aspect, up to 250 &#x3bc;m in size. The nanoparticles and granular particles plug fractures in the wellbore to strengthen the wellbore.

Drilling fluids with nano and granular particles and their use for wellbore strengthening

A use of nanoparticles in a well fluid for improved lubricity is disclosed herein. The nanoparticles are present in the well fluid in low amounts below 5 wt %. The nanoparticles may be formed ex situ and added to the fluid or in situ in the fluid. In one aspect, the well fluid is a drilling fluid. In a further aspect, the well fluid is an invert emulsion based fluid or an aqueous based fluid.

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Calgary, Canada

Maen Moh'd Husein