Effect analysis of new wells development in Chongxi gas reservoirand a discussion on solutions

To solve the problem of serious water production during the development of new gas wells 72, 73X, and Xi74 west of the reservoir of Xu4 member in Chongxi gas field of central Sichuan, the geological characteristics, the current situation of production, the gas producing characteristics in the water-free gas production period and the simultaneous production period of gas and water, are analyzed. The Dupuit critical production model is applied to obtain the optimized production without effusion in borehole. Therefore, a rational working system for gas wells producing water is worked out to prolong the water-free gas production period. The productivity equation of sandstone formations proposed by Mishra and Caudle is applied. Combined with the flat drop model, the critical liquid carrying flow rate under different wellhead pressure is calculated. The critical liquid carrying flow rate and the node analysis method are used to ensure the actual gas production is more than the critical liquid carrying flow rate. This is favorable for producing fluid by fully utilizing the formation energy. Case study shows that the method features in high accuracy for the effect analysis of gas wells development, convenient calculation, and good practicality. It can also be applied to the development of similar gas wells. 