套管悬挂器:套管悬挂器分螺纹式(芯轴式)、卡瓦式两大类。卡瓦式悬挂器的型式有：G型、W型、WD型、WE型等。WD型悬挂器用于连接套管头和表层套管，它通过外力作用使卡瓦牙抱紧套管；W型悬挂器是套管自重激发密封的结构；WE型和G型是手动激发密封的结构。Casing hanger:Casing hanger is classified into two kinds, i.e. the threaded (mandrel) and the slipped; slip casing hanger consists of G, W, WD, WE and other types, WD hanger is applicable for connection of casing head and surface casing and keeps the slip closing around the casing fast in use of outer force, W hanger adopts self-weight energized sealing structure and WE & G hanger is manual-energized sealing structure.