Special casing threaded joint for high-temperature high-pressure deep gas well

The utility model discloses a special threaded joint of a sleeve for a high-temperature high-pressure deep gas well. Wherein the pipe body and the coupling are matched with each other, and the coupling is sequentially provided with a coupling middle hole, a negative-angle torque shoulder, an internal thread auxiliary sealing conical surface, an internal thread sealing guide conical surface, an internal thread main sealing conical surface, an internal thread transition conical surface, an internal thread tool withdrawal groove and a coupling internal thread in the axis direction. The pipe bodyis sequentially provided with a pipe body negative-angle end face, an external thread auxiliary sealing conical face, an external thread sealing guide conical face, an external thread main sealing conical face, a pipe body external thread and a pipe end inner plane in the axis direction. After the coupling internal thread is in threaded connection with the pipe body external thread, the internal thread main sealing conica