SEH type liquid pneumatic elevator is a kind of oil and natural gas drilling operation in improving casing hydraulic operation tools.The hydraulic elevator has the advantages of compact structure, safe and reliable, reduces the labor intensity of workers, improve work efficiency, more safe and reliable than pneumatic elevator.SEH type casing elevator is suitable for 114.3-355.6mm (4 1/2 ~ 14 in) size of casing. SEH type elevator can withstand the load 500tons.