... integral type wellhead submersible,electric pump wellhead,metal seal wellhead,double-pipe wellhead,multi-seat type wellhead,composite wellhead,etc., ... is mainly characterized in that:Wellhead adopts a single-layer or a double-layer casing head,the bottom is welded and is ... reach 20000psi,and the working temperature:-18°C~346°C.Double-pipe wellhead device can simultaneously conduct well completion work ...