The check valve in the normal drilling process are at the normally-on state

Including the BOP system , the check valve is actually a check valve connected between the drill collars and drill pipe . Normal drilling , the drilling fluid flows downwardly through the valve gap cycle ; when a kick or blowout occurs, the high pressure fluid flow in the reverse direction , to promote the spool piece with the base generated by the contact seal to prevent deterioration . Check valve with quick response and good sealing capacity , in the anti- kick , play a decisive role in the blowout on drilling safety plays an important guarantee. However, the check valve in the normal drilling process are often turned in , high-pressure  Instrument valve manifolds  erosion and corrosion , easy to cause valve seal failure or even completely scrapped, and the entire system within the blowout preventer , the well Dizhi return valve worst working conditions . Therefore it is  Check valve  for the check valve failure mechanisms in-depth research, analysis, in order to take  Male connector  to improve valve performance , and promote the overall level of non-return valve to a new level , which reflects its significant technical value and economic benefits. The need to study the drilling process , when faced with high-pressure formations , if there is no reliable blowout preventer system may occur . Whether drillstring outside blowout , or drill string blowout , there is the potential danger caused by catastrophic accidents , and some pretty heavy consequences .