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:
Mar. 15, 1988
Filed:
Jun. 30, 1983
Thomas K Perkins, Dallas, TX (US);
Atlantic Richfield Company, Los Angeles, CA (US);
Abstract
A selectively electrically insulated, cemented and perforated tubular electrode provides a more effective system for electrically heating formations comprised of interbedded high and low electrical conductivity layers. The tubular electrode is located opposite the formation and is exteriorly insulated at an upper part of the formation and perhaps in low part of the formation. A central part of the tubular electrode is left free of electrical insulation. The tubular electrode is cemented in place and perforated at vertically spaced apart points into oil-bearing layers of the formation. The electrode may be a part of a casing string and the casing string specially designed to reduce alternating current hysteresis losses and current losses to the overburden.