The utility model discloses an oil pipe for oil and gas wells. The oil pipe comprises an oil pipe body and an oil pipe coupling. The oil pipe is characterized in that a buttress external thread is arranged on the outer wall of the pipe body at one end of the oil pipe body, and an externally-thickened external thread is arranged on the outer wall of the pipe body at the other end of the oil pipe body; an externally-thickened internal thread is arranged on the inner wall of the pipe body at one end of the oil pipe coupling, and a buttress internal thread is arranged on the inner wall of the pipe body at the other end of the oil pipe coupling; the buttress external thread at one end of the oil pipe body is matched with the buttress internal thread at one end of the oil pipe coupling; and the externally-thickened external thread at the other end of the oil pipe body is matched with the externally-thickened internal thread at the other end of the oil pipe coupling. The oil pipe can replace an externally-hickened oil pipe; after the externally-thickened oil pipe is repaired, the oil pipe with the special structure can continuously serve according to the using condition of the externally-thickened oil pipe, so that the investment cost spent on a new oil pipe is reduced; and in the repair process of the threads of the old externally-thickened oil pipe, only a damaged external thread end is processed, and the coupling is replaced at the other end of the old externally-thickened oil pipe, so that the repair cost can be remarkably reduced, and the repair efficiency is improved.