The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 1989
Filed:
Sep. 09, 1988
Robert H Friedman, Houston, TX (US);
Billy W Surles, Houston, TX (US);
Texaco Inc., White Plains, NY (US);
Abstract
Our invention pertains to a method of treating an oil well completed in an oil containing consolidated limestone or dolomite formation, to form a fluid impermeable barrier in the formation some distance from the oil well. The barrier may be a cone or pancake shaped barrier below the perforation to prevent bottom water coning, or a cylindrical barrier may be formed opposite portions of the well perforations. An aqueous hydrcarbon emulsion treating fluid is used which comprises a hydrocarbon, water and surfactant, whose pH is in the rqnge of from 2 to 6 and preferably adjusted to a level determined experimentally to cause precipitation of hydrocarbon after exposure to the formation from 7 to 14 days. First the emulsion and then the displacement fluid are injected into the formation at a predetermined injection rate which causes the polyvalent metal ions to be extracted from said formation and accumulated in the treating fluid at a controlled rate. The level of polyvalent metal ions in the treating fluid reaches a critical concentration for precipitating hydrocarbon from the treating fluid after the treating fluid has been displaced away from the wellbore to the desired location.