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:
Jan. 22, 2013
Filed:
Jul. 01, 2008
Ronald Marshall Bass, Houston, TX (US);
Robert Rex Burnett, Katy, TX (US);
Richard Martin Ostermeier, Houston, TX (US);
Jeremiah Glen Pearce, Houston, TX (US);
William Mountjoy Savage, Houston, TX (US);
Ronald Marshall Bass, Houston, TX (US);
Robert Rex Burnett, Katy, TX (US);
Richard Martin Ostermeier, Houston, TX (US);
Jeremiah Glen Pearce, Houston, TX (US);
William Mountjoy Savage, Houston, TX (US);
Shell Oil Company, Houston, TX (US);
Abstract
A down-hole tool provided with a transmitter system for inducing a transient electromagnetic field in an earth formation has an induction coil with a number of windings to generate essentially a magnetic dipole field. The number of windings is divided into two or more groups of windings arranged to cooperatively generate the essentially magnetic dipole field when energized. Switching means are arranged to essentially simultaneously terminate the energizing of the groups of windings. The groups of windings are electrically isolated from each other or connected in parallel to each other, at least when the energizing is terminated. A transient electromagnetic field may thus be induced in an earth formation by essentially simultaneously terminating energizing each group of windings by operating the switching means. A transient electromagnetic response signal may be recorded, and used in a method of producing a mineral hydrocarbon fluid.