| 摘要 |
FIELD: oil production, particularly, devices for joining of drill and tubing pipes. SUBSTANCE: coupling for drill and tubing pipes has body and ball members in channels made in form of external radial circular bores in body end parts. Ball members are installed for their projection beyond bore through at least 1/3 of their diameter. EFFECT: reduced coefficient of friction between pipes in well, increased service life and operate reliability of drill and tubing pipes and their joints. 1 dwg |
