发明名称 |
CENTRALIZER FOR WIRELINE TOOLS |
摘要 |
An improved centralizer apparatus for use in oil well wireline toolstrings comprising a central mounting rod (20) and floating spring mechanisms (30, 90) between which a number of jointed centralizer arms (120, 140) are connected. The jointed centralizer arms (120, 140) have a section with a concave profile (64, 84) disposed near to their pivot points (50) so that a closing force acting on the arms (60, 80) acts at a greater distance from the pivot, thereby increasing the closing moment and making the centralizer easier to draw into a borehole (200) with a narrow cross-section. The floating spring mechanisms also have a linkage (99) to the presser plate (98) of the spring (96) such that an axial force pulling the centralizer apparatus into a borehole is transferred directly into a force on the spring (96), thereby reducing the opening moment the springs exert on the centralizer arms, making them easier to close.
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申请公布号 |
WO0181709(A1) |
申请公布日期 |
2001.11.01 |
申请号 |
WO2001GB01790 |
申请日期 |
2001.04.20 |
申请人 |
SONDEX LIMITED;STUART-BRUGES, WILLIAM, PETER;SEARIGHT, THOMAS, LEMPRIERE;HARRIS NEIL, GEOFFREY |
发明人 |
STUART-BRUGES, WILLIAM, PETER;SEARIGHT, THOMAS, LEMPRIERE;HARRIS NEIL, GEOFFREY |
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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