Shielding of Directional Magnetic Sensor Readings in a Measurement While Drilling Tool for Oil Well Positioning-Reference-Cited by-同舟云学术

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

Published:2005-10-27 Issue:4 Volume:128 Page:343-345
ISSN:0195-0738
Container-title:Journal of Energy Resources Technology
language:en
Short-container-title:

Author:

Amundsen Per A.¹,Torkildsen Torgeir²,Saasen Arild³

Affiliation:

1. Department of Mathematics and Natural Science, University of Stavanger, N-4036 Stavanger, Norway

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

3. Statoil ASA, N-4035 Stavanger, Norway

Abstract

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.

Publisher

ASME International

Subject

Geochemistry and Petrology,Mechanical Engineering,Energy Engineering and Power Technology,Fuel Technology,Renewable Energy, Sustainability and the Environment

Link

http://asmedigitalcollection.asme.org/energyresources/article-pdf/128/4/343/5852907/343_1.pdf

Reference10 articles.

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2. Ekseth, R. , 1998, “Uncertainties in Connection with the Determination of Wellbore Positions,” Dr.-ing. Thesis NTNU, Trondheim, Norway.

3. Williamson, H. S. , 1999, “Accuracy Prediction for Directional MWD,” Paper No. SPE 56702 presented at the SPE Annual Technical Conference and Exhibition, Oct. 3–6 Houston, TX.

4. Torkildsen, T., and Lotsberg, O., 2001, “Acceptance Values for MWD Magnetic Wellbore Surveying,” paper presented at the 13th ISCWSA meeting, Haarlem, The Netherlands, 2 March.

5. Torkildsen, T., Edvardsen, I., McCulloch, S., Fjogstad, A, Saasen, A., Amundsen, P. A., and Omland, T. H., 2004, “Drilling Fluid Affects MWD Magnetic Azimuth and Wellbore Position,” Paper No. SPE/IADC 87169 presented at the IADC/SPE Drilling Conference held in Dallas, TX, March 2–4.

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