3D SIMULATION OF TRANSIENT ELECTROMAGNETIC FIELD FOR GEOSTEERING HORIZONTAL WELLS
E.V. Onegovaa and M.I. Epova,b
a Baker Hughes Russian Science Center, ul. Kutateladze 4a, Novosibirsk, 630090, Russia
bA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
Keywords: Geosteering, transient electromagnetic method, finite-element method
Pages: 725-729
Abstract
The article discusses numerical simulation of the transient electromagnetic field. The field source is an induction coil. We consider the situation when a logging tool is in a horizontal well in a medium with horizontal and vertical boundaries. The specific features of this problem are the metallic mandrel of the tool, 3D geometry, and distant boundaries. The method of separate computation of normal and anomalous fields is proposed. The finite-element method is used for spatial approximation of the field, and the implicit finite-difference scheme is used for the approximation of the field in time. The correctness and advantages of the method are shown. Some numerical results are demonstrated. The method proposed can be used when designing tools for geosteering.
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