Gas well suction and drainage system and method

The invention belongs to the technical field of petroleum fracturing, and particularly discloses a gas well suction and drainage system and method. Comprising an oil pipe, a drainage system and a control system, the liquid discharging system is arranged in the oil pipe, a check valve is arranged at the top of the liquid discharging system, an outlet of the check valve is connected with an inlet of the energy cavity, an air spraying opening is formed in the bottom of the liquid discharging system, an exhaust opening of the energy cavity is connected with the air spraying opening, and the liquid level signal output end of the liquid discharging system is connected with the signal input end of the control system. And the control signal output end of the control system is connected with the control signal input end of the liquid discharge system. The liquid drainage system is controlled to absorb liquid, the liquid is gasified to serve as rising kinetic energy to discharge the absorbed liquid out of the well, the