Lubricating coating composition suitable for tubular threaded joints
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United States of America Patent
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app pub date -
Apr 10, 2009
filing date -
Oct 13, 2006
priority date (Note) -
Abandoned
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Abstract
A tubular threaded joint for connecting tubing or casing used to excavate oil wells have a lubricating coating formed from a lubricating coating composition comprising one or more basic lubricants selected from a basic sulfonate salt, a basic salicylate salt, a basic phenate salt, and a basic carboxylate salt and having biodegradability value (BOD) of at least 20% when measured after 28 days in seawater. The joint can be used without application of a compound grease containing heavy metals even in a country or region having severe environmental regulations.
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