发明名称 |
Oljebrønnrør eller oljebrønnrørsforbindelseselement |
摘要 |
<p>A threaded joint for steel pipes for use in an oil well which has improved galling resistance and which is protected from rusting comprises a pin and a box each having a contact surface including a threaded portion and an unthreaded metal contact portion. The contact surface of at least one of the pin and the box has a lower layer of a viscous liquid or semisolid lubricating coating comprising at least wax and a fatty acid alkaline earth metal salt and not containing a harmful heavy metal such as lead and an upper layer of a dry solid coating formed from an aqueous resin coating composition, an organic solvent type coating composition, or an ultraviolet curing coating composition.</p> |
申请公布号 |
NO335880(B1) |
申请公布日期 |
2015.03.16 |
申请号 |
NO20110001090 |
申请日期 |
2011.08.02 |
申请人 |
SUMITOMO METAL INDUSTRIES LTD;VALLOUREC MANNESMANN OIL & GAS FRANCE SAS |
发明人 |
GOTO KUNIO;IMAI RYUICHI |
分类号 |
E21B17/042;F16L15/00;F16L15/04 |
主分类号 |
E21B17/042 |
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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