Air-tight seal special thread heat insulation oil pipe for deep well pipe column

The utility model discloses an airtight seal special thread heat insulation oil pipe for a deep well pipe column, which comprises an outer pipe and a coupling, a heat insulation layer and an inner pipe are sequentially arranged on the inner side of the outer pipe, external threads are arranged on the outer circumferential surfaces of the two ends of the outer pipe, external seal shoulders are arranged at the front ends of the external threads, the external seal shoulders are spherical rings, and the spherical arc is 6.0 mm; the two end structures of the coupling are symmetrically arranged, internal threads are arranged at the two ends of the coupling, an anti-torque shoulder is arranged in the middle of the coupling, stress release grooves are formed in the two sides of the anti-torque shoulder, and a sealing ring is detachably arranged in each stress release groove. The sealing ring is in a combined type and comprises a metal gasket and a rubber pad, the metal gasket and the rubber pad are connected in a bon