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:
Nov. 13, 2012
Filed:
Oct. 25, 2010
Paul L. Camwell, Calgary, CA;
Derek W. Logan, Calgary, CA;
David D. Whalen, Calgary, CA;
Thomas H. Vermeeren, Spruce Grove, CA;
Anthony R. Dopf, Calgary, CA;
Paul L. Camwell, Calgary, CA;
Derek W. Logan, Calgary, CA;
David D. Whalen, Calgary, CA;
Thomas H. Vermeeren, Spruce Grove, CA;
Anthony R. Dopf, Calgary, CA;
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
A gap sub assembly can be used to form an electrical isolation in a drill string, across which a voltage is applied to generate a carrier signal for an electromagnetic (EM) telemetry system. The assembly comprises two conductive generally cylindrical components fashioned with a matching set of male and female rounded coarse threads, held such that a relatively uniform interstitial space is formed in the overlap space between them. The third component is a substantially dielectric electrical isolator component placed into the gap between the threads that effectively electrically isolates the two conductive components. Injecting the dielectric material under high pressure forms a tight bond resistant to the ingress of conductive drilling fluids (liquids, gases or foam), thus forming a high pressure insulating seal.