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Composition for recovering hydrocarbon fluids from a subterranean reservoir

  • US 7,300,973 B2
  • Filed: 09/20/2002
  • Issued: 11/27/2007
  • Est. Priority Date: 06/14/2000
  • Status: Expired due to Term
First Claim
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1. A composition comprising a water-in-oil emulsion of highly cross linked expandable polymeric microparticles having an unexpanded volume average particle size diameter of from about 0.05 to about 10 microns and a cross linking agent content of about 6,000 to less than about 9,000 ppm of labile cross linkers and from 0 to about 300 ppm of non-labile cross linkers wherein said polymeric microparticle remains in an unexpanded state until expansion of the microparticle is triggered by heat, change in pH or a combination thereof.

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