Patents by Inventor James H. Lybarger

James H. Lybarger 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).

  • Temporarily plugging a subterranean reservoir with a self-foaming aqueous solution
    Patent number: 4232741
    Abstract: Portions of a subterranean reservoir are temporarily plugged by injecting an aqueous liquid solution which contains nitrogen gas-generating reactants, a foaming surfactant and a pH controlling system arranged so that the solution remains relatively unreactive within the well but forms a relatively immobile foam within the pores or other openings within the reservoir formation.
    Type: Grant
    Filed: July 30, 1979
    Date of Patent: November 11, 1980
    Assignee: Shell Oil Company
    Inventors: Edwin A. Richardson, Ronald F. Scheuerman, David C. Berkshire, Joseph Reisberg, James H. Lybarger
  • Increasing the clay dissolving capability of a buffer-regulated mud acid
    Patent number: 4090563
    Abstract: The clay dissolving capability of an aqueous mud acid solution of weak acid, weak acid salt and fluoride salt (of the type described in the E. A. Richardson U.S. Pat. No. 3,889,753) can be increased by including in the solution a partial salt of an aminopolyacetic acid chelating or complex-forming agent.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: May 23, 1978
    Assignee: Shell Oil Company
    Inventors: James H. Lybarger, Edwin A. Richardson, Ronald F. Scheuerman, Charles C. Templeton
  • Increasing the clay-dissolving capability of a relatively high pH self-generating mud acid
    Patent number: 4089787
    Abstract: The clay-dissolving capability of a self-generating mud acid comprising an aqueous solution or dispersion of a fluoride salt, an ester of a 1-5 carbon atom aliphatic alcohol and a 2-5 carbon atom fatty acid suitable for use at temperatures exceeding about 180.degree. F is improved by adding an effective amount of an aminopolyacetic acid salt chelating or complexing agent.
    Type: Grant
    Filed: March 16, 1977
    Date of Patent: May 16, 1978
    Assignee: Shell Oil Company
    Inventors: James H. Lybarger, Charles C. Templeton, Edwin A. Richardson, Ronald F. Scheuerman
  • Plugging a subterranean reservoir with a self-sealing filter cake
    Patent number: 3998269
    Abstract: A subterranean reservoir is plugged by injecting a suspension containing solid particles of a resin capable of softening and resolidifying at the reservoir temperature. The particle sizes are correlated with the reservoir pore sizes so that particles are screened-out within and along the face of the reservoir formation. And, the particle compositions are correlated with the reservoir temperature so that the screened-out particles in and along the reservoir formation become fused into a substantially impermeable layer.
    Type: Grant
    Filed: October 10, 1975
    Date of Patent: December 21, 1976
    Assignee: Shell Oil Company
    Inventor: James H. Lybarger
  • Process for chemically and mechanically limited reservoir acidization
    Patent number: 3948324
    Abstract: The fluid productivity of a relatively unconsolidated oil producing subterranean siliceous reservoir is improved by a limited flow rate sequential injection of oil solvent, relatively dilute hydrogen fluoride-free acid, and relatively dilute hydrogen fluoride containing-acid, and a gradual returning of the well to production.
    Type: Grant
    Filed: February 18, 1975
    Date of Patent: April 6, 1976
    Assignee: Shell Oil Company
    Inventor: James H. Lybarger