FIELD: mining.
SUBSTANCE: cylindrical thread is made in the connection on inner surface of flexible bush. Pitch of cylindrical thread in the bush is equal to the pitch of taper thread of connection. There is chamber in groove of coupling on cylindrical surface. Flexible bush is installed in chamber with possibility of joining cylindrical thread in the bush with pitch of taper thread on the tube end at rotation of coupling or tube for screwing the connection and filling the annular gap between surface of runout of taper thread on the tube and groove in the coupling and gaps between bottoms and heads at screwing the threaded connection of casing pipes or tubing strings with connection coupling.
EFFECT: invention improves reliability of tightness of threaded connections of casing pipes or tubing strings with taper thread on ends in oil and gas wells.
4 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| COUPLING TO CONNECT CASING PIPES OR TUBING STRINGS IN OIL AND GAS WELLS | 2003 |
|
RU2269640C2 |
| CONNECTION OF CASING STRINGS OR PUMP-COMPRESSOR PIPES WITH CONICAL THREADED ENDS IN OIL AND GAS WELLS | 2005 |
|
RU2294477C2 |
| JOINING OF PUMP RODS, CASING PIPES, PUMP-COMPRESSOR TUBES IN OIL AND GAS WELLS | 2002 |
|
RU2268434C2 |
| UNIVERSAL CASING HEAD FOR CONNECTIONS OF CASING STRINGS ON WELLHEAD | 1999 |
|
RU2173764C2 |
| PROTECTOR FOR PROTECTION OF FORCE CABLE IN A WELL | 2003 |
|
RU2250345C1 |
| PROTECTOR | 2009 |
|
RU2403372C2 |
| CHECK VALVE | 2004 |
|
RU2285179C2 |
| PROTECTOR | 2009 |
|
RU2403373C1 |
| LOCKING DEVICE | 2010 |
|
RU2447343C2 |
| DEVICE FOR PROTECTION OF POWER CABLE IN A WELL | 2002 |
|
RU2249667C2 |
