<p>A combination saver sub, kelly and lower kelly cock for use with a drill string having a hard wired telemetering system installed therein. The combination includes a hard wired circuit for extending the circuit from the top of the drill pipe to a slip ring assembly mounted on the kelly.</p>
申请公布号
DE2827295(C2)
申请公布日期
1986.07.24
申请号
DE19782827295
申请日期
1978.06.21
申请人
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V., DEN HAAG, NL
