Nickel-based composite oil pipe string

The invention relates to a nickel-based composite oil pipe string. The nickel-based composite oil pipe string comprises an oil pipe and a coupling, the oil pipe is provided with a coupling connecting end in threaded connection with the coupling, the oil pipe comprises a base pipe and a nickel-based alloy lining layer, the nickel-based alloy lining layer is provided with a turned-over edge, and the turned-over edge covers the end face, at the coupling connecting end, of the base pipe; an annular step is arranged in the coupling, a sealing ring is arranged between the annular step and the connecting end of the coupling, the sealing ring is a nickel base alloy ring, an oil pipe sealing lip is arranged at the end, in contact with the oil pipe in the axial direction of the oil pipe, of the sealing ring and provided with an oil pipe lip sealing arc face, and the oil pipe is in threaded connection with the coupling and presses the sealing ring in the axial direction of the oil pipe. And the oil ...