天然气与石油2026，Vol.44Issue(1)：47-54,8.DOI:10.3969/j.issn.1006-5539.2026.01.006
基于优化控制的循环气举排量计算新模型研究
Study on a new model for calculating cyclic gas lift displacement based on optimal control
摘要
Abstract
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.关键词
循环气举/注气量优化/临界携液流速/优化控制/井筒能量损失Key words
Cyclic gas lift/Gas injection rate optimization/Critical liquid-carrying velocity/Optimal control/Wellbore energy loss引用本文复制引用
王锦生,包晓航..基于优化控制的循环气举排量计算新模型研究[J].天然气与石油,2026,44(1):47-54,8.基金项目
国家科技重大专项课题"致密油气藏数值模拟新方法与开发设计"(2017ZX05009-005) （2017ZX05009-005）
