... medium:crude oil,water,nature gas bottom connection:welded, slips , threaded Casing head, for connection of casing to various wellhead assemblies, is applicable to ... holes in the casing head block.The casing head produced by Yangbiao is of standard structure, is completed with the different casing heads that ... 7" ,5 1/2" anti-corrosion and high-temperature resistant with black painting Casing Head