| 摘要 |
A centering device or centralizer for mounting on oil well tubings and similar conduit strings, the invention acts to maintain substantially uniform clearance between such strings and a wellbore. The centering device of the invention differs from prior non-welded centering devices in that the present device does not require bending or deformation of any of its structural elements during assembly or disassembly yet displays the necessary stand-off characteristics during utilization of the device within the wellbore to assure uniform clearance between the wellbore and the casing. A particular feature of the invention is an independent retaining ring which securely attaches a plurality of structural elements to form the present centering device.
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