基于优化控制的循环气举排量计算新模型研究OA

The second member of the Xujiahe Formation in the Xujiahe gas reservoir of the Hechuan Gas Field is a lithologic trap sandstone gas reservoir characterized by low porosity,low permeability,and high water content.Gas wells in this formation commonly produce gas and water simultaneously.To date,the formation pressure coefficient has declined to 0.85,with approximately 46％of individual wells experiencing low production or even shutdown due to wellbore liquid loading.Currently,compressor-assisted cyclic gas lift is the primary liquid removal method for platform well groups in this block.However,how to reasonably match gas lift displacement and optimize gas displacement rate remains a major challenge in field production.This study proposes a novel model for calculating gas injection rate in cyclic gas lift systems based on optimal control.By coordinating external injection rate and gas well productivity to determine the critical liquid-carrying velocity calculation method,and integrating the constraints of wellbore energy loss,critical liquid-carrying requirements,and reservoir energy supply,the model achieves dynamic optimization of gas injection rate.Field test results show that the optimization using this model significantly enhances gas well production and liquid removal efficiency:optimized gas well production increased by 20％,liquid removal efficiency improved by 37.5％,and equipment failure rates decreased by 25％.The research results provide theoretical support and practical guidance for the optimization of cyclic gas lift production strategies.