Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Patent
1989-12-19
1992-07-21
Maples, John S.
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
507122, 252312, 2523153, 2523154, 1621683, 1621685, 527312, D21H 1745, D21H 1724, C09K 702
Patent
active
051322854
ABSTRACT:
A method of thickening, stabilizing, controlling mobility, or enhancing water retention in aqueous media and electrolyte-containing aqueous media employs neutrally-charged polyamphoteric graft copolymers of polysaccharides with zwitterionic monomers or cationic/anionic monomer pairs. These polyampholytes are characterized by their unique resistance to loss of intrinsic viscosity in the presence of electrolytes. These polyampholytes may be prepared by an inverse emulsion method of graft copolymerization. One such electrolyte-tolerant polyampholyte is a novel composition prepared by graft copolymerization of guar gum.
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Geist Gary L.
Maples John S.
National Starch and Chemical Investment Holding Corporation
Porter Mary E.
Szala Edwin M.
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