Well string centralizer and method of forming
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United States of America Patent
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Jul 24, 2012
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N/A
app pub date -
Dec 20, 2007
filing date -
Dec 20, 2006
priority date (Note) -
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Abstract
Centralizer includes a body formed of a first material and an outer shell formed of a second material. The outer shell is installed to resist destructive damage and longitudinal creep of the portion formed of the first material. The outer shell covers the entire exterior surface of the body, including ribs that protrude from the exterior surface. The outer shell material is more durable than the material of the body. The outer shell material may be steel and the body material may be a polymer. The ribs and exterior surface of the body bond to the outer shell. The centralizers fit on well pipes to centralize them within boreholes.
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