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:
Sep. 10, 2002
Filed:
Mar. 21, 2000
Richard Gerrit Hakvoort, Rijswijk, NL;
Melis van der Horst, Rijswijk, NL;
Shell Oil Company, Houston, TX (US);
Abstract
A method of providing a computed induction log of an induction logging tool run through an interval of a wellbore that extends through a layered formation invaded by wellbore fluid. The method comprises computing a first response of the induction logging tool by solving for each formation layer the Maxwell equations for the electromagnetic field using a one-dimensional concentric cylinder model not taking into account the effects of formation layering and of the orientation of the logging tool with respect to the formation layering, and determining for each formation layer an equivalent resistivity that gives for a homogeneous environment a response of the induction logging tool that equals the first response; and solving for a number of logging points the Maxwell equations using a one-dimensional layered model using the equivalent resistivities as computed in step wherein the effects of the formation layering and of the orientation of the logging tool with respect to the formation layering are taken into account, to provide the computed induction log of the induction logging tool.