FILLING AND CIRCULATING HEAD FOR USE IN THE CONSTRUCTION OF OIL AND GAS WELLS

摘要

A conventional mud saver valve (9) used to inhibit leakage from fill tubes (7) onto the working platform while new stands of casing are being fitted is replaced by a valve having a metal valve member (109') and a vulcanized rubber seat (120). In addition, a pressure gauge (128) is fitted to the cover (2) of the filling and circulating head (1) to detect excess pressure after circulation. A part (210) is also provided to release the filling and circulating head (1) form "lock-up".