Gas well N-type internal circulation self/external supply energy-saving liquid drainage and gas production system

The invention relates to an N-shaped internal circulation self/external supply energy-saving liquid drainage gas production system for a gas well, which is characterized in that a large oil pipe and a small oil pipe are coaxially mounted in a well wall sleeve, a sealing packer is mounted at the lower end of an annular gap between the large oil pipe and the small oil pipe, a gas jet atomizer is mounted at the upper part of the sealing packer in the small oil pipe, and the lower end of the large oil pipe is communicated with the gas well through a communicating pipe; and a check valve is mounted on the communicating pipe. The U-shaped tubular column is scientific and reasonable in design, liquid drainage is conducted through energy of the outside or an adjacent high-pressure gas production well when the gas quantity of the well is insufficient, the characteristics of gas expansion and lifting are reasonably and fully utilized, the principles of jet flow, suction and atomization are organically combined in the w