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Stability enhanced water-in-oil emulsion and method for using same

  • US 7,186,673 B2
  • Filed: 03/28/2001
  • Issued: 03/06/2007
  • Est. Priority Date: 04/25/2000
  • Status: Expired due to Term
First Claim
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1. A method for recovering hydrocarbons from a subterranean formation, said method comprising the steps of:

  • a) preparing a water-in-oil emulsion by1) obtaining oil to be used in said emulsion,2) pretreating at least a portion of said oil, said pretreating step comprising at least one of adding a polymer which comprises a fuctionalized or a functionalizable polymer to said oil, biotreating said oil, photochemically treating said oil, or combinations thereof, wherein where said pretreating step includes adding a functionalizable polymer said method further includes functionalizing said functionalizable polymer.3) adding water, and4) mixing until said water-in-oil emulsion is formed;

    b) injecting said water-in-oil emulsion into said subterranean formation; and

    c) recovering hydrocarbons from said subterranean formation.

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