Power generation system utilizing natural energy of oil and gas well

The invention discloses a power generation system utilizing natural energy of an oil and gas well. The power generation system comprises an oil conveying pipeline and a power generation device. The power generation device comprises an impeller shell and a generator outer pipe which are coaxially connected, the end of the oil conveying pipeline is connected with the front end of the impeller shell, an impeller is coaxially arranged in the impeller shell and connected with one end of a transmission shaft, the other end of the transmission shaft extends into the generator outer pipe, and a generator stator and a generator rotor are arranged in the generator outer pipe. The generator stator is fixedly arranged and adopts a permanent magnet, the generator rotor is fixedly connected with the other end of the transmission shaft, and the transmission shaft is rotationally connected with the impeller shell and the generator outer pipe. Natural kinetic energy of an oil well can be effectively utilized, and the effects