Abstract: In line with the problems of water production and liquid accumulation in gas wells, the technology for foam drainage gas recovery is mainly used in Sulige Gas Field. The traditional technology for foam drainage gas recovery is manually injected from trucks, which has a lot of work and costs much, and gas wells are hard to control. For this reason, and in combination with field demand and wellhead conditions, a device has been developed which can remote control and automatically drop solid ball-like displacing agent, which increases the foaming time of the agent, improves the agent efficiency and also effectively reduces the labor intensity and labor cost. This device is powered by solar panels, so it has a low energy consumption and can satisfy the demand for chemical addition according to fixed time interval, fixed amount and fixed frequency. The ball storage barrel is designed to be at atmospheric pressure and easy to add bubbles to displace balls manually. The success test of this technique provides a new concept for digitized drainage gas recovery for Sulige Gas Field and has a broad application prospect. It is suggested to further promote the use this technique.