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Methods and compositions for use in oil and/or gas wells

  • US 9,868,893 B2
  • Filed: 03/11/2015
  • Issued: 01/16/2018
  • Est. Priority Date: 03/14/2013
  • Status: Active Grant
First Claim
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1. A method of preventing, reducing, or eliminating a crude oil emulsion in an oil and/or gas well having a wellbore, comprising:

  • injecting a solution comprising an emulsion or a microemulsion into the wellbore of an oil and/or gas well,wherein the crude oil emulsion is prevented, reduced, or eliminated following injection of the solution; and

    wherein the emulsion or the microemulsion comprises a surfactant, a first solvent, and a silicone solvent, wherein the silicone solvent is a volatile linear or cyclic siloxane having the chemical formula (CH3)3SiO—

    ((CH3)2SiO)n

    Si(CH3)3 or cyclic [(CH3)2SiO]m, wherein n is 0 to 5 and m is 4 or 5, wherein the silicone solvent has a molecular weight less than about 800 g/mol, wherein the surfactant comprises a nonionic, an anionic, or a cationic surfactant, wherein the cationic surfactant comprises a quaternary ammonium salt.

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