Patents by Inventor Evan H. Street

Evan H. Street 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).

  • Process for stably sequestering iron while acidizing a reservoir
    Patent number: 4167214
    Abstract: In a well treating process in which an acidic solution having a pH of less than about 2 tends to dissolve ferric ion-containing materials from the well conduits and to precipitate ferric ion-containing solids when the pH of the solution increases beyond about 3, such a precipitation can be prevented by dissolving limited proportions of both 5-sulfosalicylic acid and citric acid within the acidic solution to be injected.
    Type: Grant
    Filed: July 13, 1978
    Date of Patent: September 11, 1979
    Assignee: Shell Oil Company
    Inventor: Evan H. Street, Jr.
  • Dissolving siliceous materials with self-acidifying liquid
    Patent number: 3953340
    Abstract: Siliceous materials in or around a well are dissolved by contacting them with a self-acidifying aqueous liquid system comprising an aqueous solution of at least one water-soluble fluoride salt mixed with a relatively slowly-reactive acid-yielding material that subsequently converts the salt solution to a hydrofluoric acid solution that has a relatively high pH but is capable of dissolving siliceous material.
    Type: Grant
    Filed: May 3, 1974
    Date of Patent: April 27, 1976
    Assignee: Shell Oil Company
    Inventors: Charles C. Templeton, Evan H. Street, Jr, Edwin A. Richardson
  • Subterranean oil shale pyrolysis with permeating and consolidating steps
    Patent number: 3945679
    Abstract: In producing shale oil by circulating hot fluid into and out of a rubble-containing cavern within a subterranean oil shale, plugging is avoided by permeating a portion of oil shale, consolidating a permeated portion, inflowing fluid outside the consolidated portion, and outflowing fluid from within the consolidated portion so the fluid is filtered through the consolidated portion.
    Type: Grant
    Filed: March 3, 1975
    Date of Patent: March 23, 1976
    Assignee: Shell Oil Company
    Inventors: Philip J. Closmann, Gary Drinkard, Evan H. Street, Charles C. Templeton, Min Jack Tham