Patents by Inventor Alireza B. Rahimi

Alireza B. Rahimi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Hydrocarbon base cementitious drilling fluids and methods
    Patent number: 5585333
    Abstract: Hydrocarbon base drilling fluids which are selectively convertible to cementitious compositions that set into hard substantially impermeable masses and methods of using such drilling fluids are provided. The drilling fluids are basically comprised of a hydrocarbon liquid having particulate hydraulic cement suspended therein. The drilling fluids are converted to cementitious compositions by admixing water and a surfactant therewith.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: December 17, 1996
    Assignee: Halliburton Company
    Inventors: Jeffrey A. Dahl, E. Dwyann Dalrymple, Patty L. Totten, Alireza B. Rahimi
  • Method of crosslinking cellulose and guar derivatives for treating subterranean formations
    Patent number: 5304620
    Abstract: The present invention provides a method of treating of subterranean formation using a gel of a graft copolymer of a hydroxyalkyl cellulose, guar or hydroxypropyl guar prepared by a redox reaction with vinyl phosphonic acid. The gel is formed by hydrating the graft copolymer in an aqueous liquid containing at least a trace amount of at least one divalent cation. The gel is crosslinked by the addition of a Lewis base or Bronsted-Lowry base, which is substantially free of polyvalent metal ions, to the gel in an amount sufficient to effect crosslinking of the graft copolymer.
    Type: Grant
    Filed: June 16, 1993
    Date of Patent: April 19, 1994
    Assignee: Halliburton Company
    Inventors: Marlin D. Holtmyer, Charles V. Hunt, Mary A. H. Laramay, Alireza B. Rahimi, Murray G. Clark