Electricity: measuring and testing – Of subsurface core sample – For magnetic properties
Patent
1978-09-13
1980-07-08
Strecker, Gerard R.
Electricity: measuring and testing
Of subsurface core sample
For magnetic properties
G01V 308
Patent
active
042119740
ABSTRACT:
In the drilling of deep holes in the earth for exploration for minerals and petroleum, borehole cores are often obtained for examination by geologists. The drill string of the drilling rig used in the drilling operation will usually impart a strong remanent magnetism to the borehole core. The remanent magnetism is oriented substantially parallel to the longitudinal axis of the drill string. A method is provided whereby the borehole core or a portion thereof may be correctly oriented with respect to the longitudinal axis of the drill string by sequentially demagnetizing the core, recording magnetization intensity, and plotting the magnetization intensity and direction to show the direction of the remanent magnetism being removed. The direction of the remanent magnetism provides a basis for correctly orienting the borehole core.
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Fuller, M., Magnetic Orientation of Borehole Cores, Geophysics, vol. 34, No. 5 (Oct. 1969), pp. 772-774.
Zijderveld, J.D.A., A.C. Demagnetization of Rocks:Analysis of Results, Methods in Paleomagnetism, edited by Collinsen, Creer & Runcord, Elsevier, pp. 254-286, 1967.
Phillips Petroleum Company
Strecker Gerard R.
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