Description:

Casing head is the adapter between the first casing string and either the BOP stack (during drilling) or the wellhead (after completion). It seals up the annulus space of casing string, and is the primary interface for the surface pressure control equipments. With 45°shoulder structure and casing hanger, casing head bears the weight of casing strings. BT secondary seal structure can be adopted at the bottom.   
Thread for casing coupling includes round long thread, round short thread and buttress thread, the size ranges from 7″to 20″. 

Specifications: