Variable density treatment fluids and methods of using such...

Wells – Processes – Placing fluid into the formation

Reexamination Certificate

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C166S307000, C166S308200, C166S308300, C166S308400, C175S065000, C175S069000, C175S072000, C507S102000, C507S117000, C507S140000, C507S202000, C507S219000, C507S270000, C507S925000

Reexamination Certificate

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07108066

ABSTRACT:
The present invention provides variable density fluid compositions and methods for using such compositions in a subterranean formation. One exemplary embodiment of the variable density fluid compositions of the present invention comprises a variable density fluid comprising: a base fluid, and a portion of variable pressure weighting material particles.

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