Mukesh Kapilla

Neale Browne

Jarrod Massam

An additive that increases the density of fluids containing a sized barite weighting agent. The wellbore fluid has rheological properties comparable to a conventional wellbore fluids but does not exhibit problems with sag and resulting variations in density. An illustrative embodiment is directed to a method for making the sized barite weighting agent and a method for using such sized barite weighting agent in a wellbore fluid. In one preferred embodiment the sized barite weighting agent has a particle diameter between 4 &#x3bc;m to 15 &#x3bc;m In another preferred embodiment, the additive has a D(by weight) of approximately 1 &#x3bc;m to 6 &#x3bc;m. In another preferred embodiment the additive has a D(by weight) of approximately 4 &#x3bc;m to 8 &#x3bc;m. The additive may be used in any wellbore fluid such as drilling, cementing, completion, packing, work-over (repairing), stimulation, well killing, and spacer fluid.

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The Woodlands, TX, United States of America

Mukesh Kapilla