FIELD: pipelines.
SUBSTANCE: invention relates to threaded joints of pipes and provides a threaded connection for pipes of oilfield grade, which can restrain the increase in torque while securing the locking nipple and the tool-joint box in cold climate conditions. Threaded connection for pipes (1) of oilfield grade includes locking nipple (2) and tool-joint box (3). Both locking nipple (2) and tool-joint box (3) have contact surface (21), (31), which has threaded portion (22), (32) and unthreaded metal contact portion (23), (33). Contact surface (21) of nipple (2) includes photocured coating (25) as the uppermost layer. Photocured coating (25) contains photocurable resin and perfluoropolyether. Contact surface (31) of tool-joint box (3) includes solid lubricating coating (35) as the uppermost layer.
EFFECT: invention can restrain the increase in torque when securing the locking nipple and the tool-joint box in cold climate conditions.
11 cl, 2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| THREADED JOINT FOR PIPES | 2010 |
|
RU2474742C1 |
| PIPE THREADED JOINT AND FORMING LUBRICATING COATING COMPOSITION FOR USE THEREIN | 2013 |
|
RU2604526C2 |
| PROTECTIVE DEVICE FOR THREADED CONNECTION OF PIPES | 2009 |
|
RU2482371C1 |
| THREADED JOINT FOR PIPES OR TUBES AND METHOD OF MAKING THREADED JOINT FOR PIPES OR TUBES | 2018 |
|
RU2729482C1 |
| THREADED JOINT FOR STEEL PIPES | 2007 |
|
RU2406003C1 |
| COUPLING SAFETY LOCK FOR PIPE THREAD JOINT | 2013 |
|
RU2569413C1 |
| THREADED JOINT WITH DRY LUBRICATING COATING | 2017 |
|
RU2671759C1 |
| THREADED JOINT FOR STEEL PIPES | 2006 |
|
RU2349825C1 |
| THREADED CONNECTION FOR PIPE AND METHOD FOR MANUFACTURING THREADED CONNECTION FOR PIPE | 2020 |
|
RU2802489C1 |
| THREADED CONNECTION | 2003 |
|
RU2281429C2 |
