Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Reexamination Certificate
2006-08-29
2006-08-29
Tucker, Philip C. (Department: 1712)
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
C507S123000, C507S226000, C507S229000, C525S283000
Reexamination Certificate
active
07098171
ABSTRACT:
New polymers, and their applications in water-based wellbore service fluids, such as, for example, drilling fluids, yield desirable filtration control and rheological properties to such fluids even after exposure to HTHP aging. Typical temperatures encountered during such aging are around 350–400° F. and the duration of the exposure is some significant time such as 16 hours or longer. Preferably, the polymers are random terpolymers of N-vinylcaprolactam, vinyl sulfonate monomer 2-acrylamido-2-methyl-1-propanesulfonic acid, and monomer acrylamide, most preferably in a molar ratio of 15:20:65 respectively. The polymers reduce HTHP filtration volumes in fresh water, sea water, potassium chloride, and lime mud systems. The polymers may also be used to inhibit or reduce shale erosion.
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Halliburton Energy Service,s Inc.
Roddy Craig W.
Tripp Karen B.
Tucker Philip C.
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