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US 8,202,824 B2Granted
Variable density treatment fluids
AssigneeHalliburton Energy Services, Inc.
InventorsB. Raghava Reddy, Krishna Ravi, Michael Szymanski, Dale Jamison, Donald Whitfill
Life of this patent
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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.
Claims17
A variable density drilling fluid comprising:
- a base fluid having a density at sea level in the range of from about 4 lb/gallon to about 18 lb/gallon and comprising a shale swelling inhibitor, an emulsifier, a viscosifier, caustic, or a fixed-density weighting agent;
- and
- a portion of variable pressure weighting material particles comprising an internal fluid at a pressure of 15 psi to about 100 psi that compress during introduction into and expand during retrieval from a subterranean formation.
Dependencies are inferred from the claim text.