Evaluation of Foam Drainage Gas Recovery Technology Test in Xushen Gas Field in Winter

The natural gas supply and demand in Daqing oilfield varies greatly with the seasonal variation. The production in winter is 2–3 times that in summer, and the gas field’s supply protection pressure is huge. During the 13th Five-Year Plan period, the peak is adjusted 132 times, with an annual average of 130 days. Foam drainage gas production technology is the most important drainage and production measure to ensure the continuous liquid-carrying production of water-producing gas Wells in Xushen Gas field. Therefore, it is more important to give full play to the supporting role of drainage gas production technology, so as to provide guarantee for the production increase of gas Wells in winter, the reduction of gas field supply protection pressure and the continuous steady production decline control of old Wells. Due to the low temperature in winter, the water solution of foaming agent is easy to freeze, and some of the foaming process is limited, which affects the effect of foaming. Through laboratory tests, the foaming stability performance, dynamic liquid carrying capacity and low temperature antifreezing performance of the bubble extractor were evaluated, the main agent of the bubble extractor was selected, the process filling system was optimized, and the process parameters of fine filling were determined. Under the temperature of −20 °C~−30 °C, the average daily gas production of a single well is increased by 15%, and good test results are obtained, which further improves the field adaptability of gas field bubbling process in winter.