Measuring and testing – Sampler – sample handling – etc. – Capture device
Patent
1985-05-23
1986-12-02
Kreitman, Stephen A.
Measuring and testing
Sampler, sample handling, etc.
Capture device
324377, 7386445, G01N 108
Patent
active
046255737
ABSTRACT:
A magnetic shielding member is provided, according to one aspect of the invention, which can be used to effectively shield a borehole core from ambient magnetic fields during drilling of a core specimen from the borehole core. The shielding member comprises a first portion and a second portion, wherein the first portion is hollow and has a first opening in a wall thereof, and wherein the second portion is hollow and includes a sidewall which extends outwardly from the exterior surface of the first portion so as to surround the first opening. The second portion sidewall extends to an open end which defines a second opening. Each portion is constructed of a high permeability ferromagnetic material having permeability characteristics herein defined. In use, a borehole core is positioned in the chamber defined within the first portion, and a drill bit is inserted through the first and second openings so as to extend into the chamber and come into cutting contact with the borehole core. According to other aspects, an apparatus and method are provided, wherein a borehole core is positioned within a hollow magnetic shielding member constructed of a material as defined above. A drill bit is inserted through an opening in the shielding member so as to come into cutting contact with the core.
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McGraw-Hill Encyclopedia, vol. 8, Table 1, pp. 34-36; vol. 10, pp. 22-23; vol. 5, pp. 229-234.
Bozorth, Richard M., "Ferromagnetism" pp. 5-7, D. Van Nostrand Co., Inc.
Kreitman Stephen A.
Oldham Scott M.
Phillips Petroleum Company
Sharp William R.
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