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
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- 引用格式:
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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.doi:10.3969/j.issn.1006-5539.2026.01.006
Wang Jinsheng, Bao Xiaohang.Study on a new model for calculating cyclic gas lift displacement based on optimal control[J].Natural Gas and Oil,2026,44(1):47-54.doi:10.3969/j.issn.1006-5539.2026.01.006
- DOI:
- 10.3969/j.issn.1006-5539.2026.01.006
- 作者:
- 王锦生1 包晓航2
Wang Jinsheng1, Bao Xiaohang2
- 作者单位:
- 1. 中国石油辽河油田外部市场项目管理部, 辽宁 盘锦 124000; 2. 中国石油辽河油田石油化工技术服务分公司, 辽宁 盘锦 124000
1. External Market Project Management Department, PetroChina Liaohe Oilfield, Panjin, Liaoning, 124000, China; 2. Petrochemical Technical Service Branch, PetroChina Liaohe Oilfield, Panjin, Liaoning, 124000, China
- 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
Cyclic gas lift; Gas injection rate optimization; Critical liquid-carrying velocity; Optimal control; Wellbore energy loss
- 摘要:
- 合川气田须家河气藏须二段为岩性圈闭砂岩气藏,具有低孔、低渗、高含水的储层特征,气井普遍气水同产。开发至今地层压力系数已降至0.85,近46%的单井因井筒积液导致低产甚至停产。目前压缩机循环气举是该区块平台井组的主要排液措施,但如何合理匹配气举排量并优化注气量,仍是现场生产中的难题。提出一种基于优化控制的循环气举排量计算新模型,通过协同井外注入量和气井产能判断井筒临界携液流速计算方法,结合井筒能量损失、临界携液、储层能量供给耦合因素制约,实现注气量的动态优化。现场试验结果表明:利用该模型优化显著提升气井产量和积液排出效率,优化后气井产量提升20%,积液排出效率提高37.5%,同时设备故障率降低25%。研究结果为循环气举生产制度的优化提供理论支持和实践指导。
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.
