one hundred and eighty tons. Oil drilling kava casing head casing sitting card one hundred and eighty tons. Kawa casing head is mainly used to fix the wellhead of the drilling well, connect the wellhead casing column, support the gravity of the technical casing and the oil casing, seal the annular space between the layers of tubing, and provide a transition connection for the installation of blowout preventer, tubing head, and oil recovery tree.