发明名称 |
Devices for centralizing pipes in borings |
摘要 |
A centralizing device comprising a plurality of blades and a pair of substantially cylindrical collars adapted to receive and carry the blades. Each collar is formed with at least two parts detachably and/or pivotally connected to each other, and each collar carries inwardly extending deformable metal fixing projections. Each end of each blade is bent substantially at right angles to a portion of the blade adjacent the end. When the blades are fitted so as to lie internally of the collars, each bent end fits into a slot in one of the collars and the projections are deformed so as to lie on the sides of the blade portions remote from the collars to thus fix the portions to the collars.
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申请公布号 |
US4042022(A) |
申请公布日期 |
1977.08.16 |
申请号 |
US19750619859 |
申请日期 |
1975.10.06 |
申请人 |
WEATHERFORD OIL TOOL (U.K.) LIMITED |
发明人 |
WILLS, STEPHEN FRANCIS EDMUND;PLEDGER, HENRY EDWARD |
分类号 |
E21B17/10;(IPC1-7):E21B17/10 |
主分类号 |
E21B17/10 |
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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