High temperature snubbing steam driving wallhead device

The utility model relates to a high-temperature snubbing steam-driving wellhead device, which is composed of a testing valve 1, a small cross joint 2, a reduced flange 7, a pressing cap 8, an oil tube hanger 9, a graphite sealing member 10, a blanking plug 11, a red copper ring sealing member 12, a metal sealing device 13, a large cross joint 16, a clamping short 17, a bottom flange 18 and a casing flange 19. Due to the adoption of the flange connection at both sides of each testing valve, the testing valves of the utility model all adopt wedge-shaped shutoff valves and the large cross joint and the oil tube hanger are sealed by a three-stage stepped type: graphite, red copper rings and metals. The blanking plug which can be thrown is arranged in the oil tube hanger and is tightly matched with the oil tube hanger. The high-temperature snubbing steam-driving wellhead device has reliable and long-acting sealing performance for shock and sucking resistance under the longtime high temperature and pressure condition in the process of the steam-driving exploitation and simultaneously can ensure convenient operation for replacing a christmas tree, a downhole technique pipe column, etc., effectively achieve the effects of reducing the difficulty degree of the operation, preventing an underground oil reservoir from cold harm and improving the steam-driving exploitation.