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Oil recovery process for use in fractured reservoirs

  • US 5,042,580 A
  • Filed: 07/11/1990
  • Issued: 08/27/1991
  • Est. Priority Date: 07/11/1990
  • Status: Expired due to Fees
First Claim
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1. A process for recovering oil from a water-wet fractured oil-bearing formation having an injection well and production well in fluid communication with a substantial portion of the formation, comprising the steps of:

  • (a) injecting a wettability agent selected from the group consisting of cationic surfactants, anionic surfactants, silanes, fatty acid complexes and aromatic/asphaltic oils, said wettability agent capable of transforming the water-wet fractured formation from water-wet to oil-wet;

    (b) contacting the water-wet fractured formation with the wettability agent injected in step (a) at a fracture/matrix interface;

    (c) injecting an oil miscible fluid; and

    (d) recovering oil.

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