Shell Oil Comapny

Evan H Street, Jr

Charles C Templeton

Edwin A Richardson

Philip J Closmann

Gary Drinkard

Min Jack Tham

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.

Process for stably sequestering iron while acidizing a reservoir

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.

Dissolving siliceous materials with self-acidifying liquid

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.

Growing community of inventors

Houston, TX, United States of America

Evan H Street, Jr