发明名称 |
IMPROVED DOWNHOLE TOOL AND METHOD |
摘要 |
A cleaning tool (1) for use in cleaning ferrous material from a wellbore has a magnetic cleaning functionality by provision of magnets (5) in an Halbach array on a downhole tool component of a workstring. The Halbach array may be an Halbach cylinder positioned on a mandrel wherein the magnetic field is external to the cylinder with substantially zero magnetic field within the tool. |
申请公布号 |
WO2011095816(A3) |
申请公布日期 |
2012.03.01 |
申请号 |
WO2011GB50191 |
申请日期 |
2011.02.04 |
申请人 |
M-I DRILLING FLUIDS U.K. LIMITED;LINKLATER, JAMES |
发明人 |
LINKLATER, JAMES |
分类号 |
E21B31/06 |
主分类号 |
E21B31/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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