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发明名称
Method and apparatus for demagnetizing a borehole
摘要
A demagnetizing sub having an electromagnet or a rotating magnet is used for demagnetizing magnetized material in a wellbore. By gradually reducing the magnetic field, the magnetized material within the borehole is demagnetized.
申请公布号
US8245771(B2)
申请公布日期
2012.08.21
申请号
US201113030728
申请日期
2011.02.18
申请人
KRUSPE THOMAS;BAKER HUGHES INCORPORATED
发明人
KRUSPE THOMAS
分类号
E21B31/06
主分类号
E21B31/06
代理机构
代理人
主权项
地址
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