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TECHNICAL BRIEFS

Shielding of Directional Magnetic Sensor Readings in a Measurement While Drilling Tool for Oil Well Positioning

[+] Author and Article Information
Per A. Amundsen1

Department of Mathematics and Natural Science, University of Stavanger, N-4036 Stavanger, Norwayper.a.amundsen@uis.no

Torgeir Torkildsen

 Statoil ASA, N-7005 Trondheim, Norway and Department of Petroleum Engineering, University of Stavanger, N-4036 Stavanger, Norway

Arild Saasen

 Statoil ASA, N-4035 Stavanger, Norway

1

Corresponding author.

J. Energy Resour. Technol 128(4), 343-345 (Oct 27, 2005) (3 pages) doi:10.1115/1.2358151 History: Received March 16, 2004; Revised October 27, 2005

Magnetic materials in the drilling fluid used for drilling a petroleum well can significantly shield the Earth’s magnetic field as measured by magnetic sensors inside the drilling pipe. This has been shown to sometimes cause significant errors in the accuracy of borehole positioning using magnetic surveying. In this paper we present a physical approach for correcting the measured magnetic fields for such shielding. An explicit solution of the shielding problem is derived for the simplest case of a magnetic sensor on the axis of the borehole.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Wellbore geometry and coordinates. The borehole is centered on the z axis, and the external magnetic field B is in the xz plane.

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