Patents Examined by Herbert C. Guynn
  • Stabilizing clayey formations
    Patent number: 4828726
    Abstract: A process for treating clayey geological formations to prevent, inhibit or reduce swelling or migrating clay particles in a formation by treating the formation with an effective amount of a quaternized oligomer which comprises a methyl quaternary amine containing an average of from about 3 to about 6 moles of epihalohydrin. The treatment is effected by introducing the oligomer into the formation in an aqueous fluid which can comprise brine, salt solutions, acid solutions, gelled fluids and the like.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: May 9, 1989
    Assignee: Halliburton Company
    Inventors: Ronald E. Himes, Edward F. Vinson