储气库采气量多目标优化预测模型  

Multi-objective optimization prediction model of gas production of gas storage

作　　者：朱喜平 ZHU Xiping(China Oil & Gas Pipeline Network Corporation)

机构地区：[1]国家石油天然气管网集团有限公司

出　　处：《油气储运》2024年第1期96-102,共7页Oil & Gas Storage and Transportation

基　　金：国家管网集团公司科研项目“文23储气库生产优化与达容达产技术优化研究”,SSCC202101。

摘　　要：【目的】地下储气库运行是一个系统性工程,涉及经济效益、技术风险、工作效率等多方面。储气库的注采优化伴随储气库运行整个流程,涉及因素较多,以往研究主要针对单因素进行优化,对多目标约束的优化研究较少。【方法】结合多目标优化算法NSGA-Ⅱ(Nondominated Sorting Genetic Algorithm Ⅱ)模型,建立多目标优化函数,设置地层-井筒-地面多约束变量,以文23储气库2号区块11口井的实际产生数据为基础,设置出砂流量、锥进流量、冲蚀流量、携液流量、地面设备限制流量及外输压力等限制因素,开展多目标优化模拟。采用该多目标优化预测模型分别针对常规采气方案和应急调峰方案进行模拟优化,通过200次迭代,计算最优化的流量范围,并对比不同约束条件下的单井采气量。【结果】在6组常规采气方案中,地层产量配比差距较大,不同的约束条件将直接影响储气库采气井的产量控制;相对于36 MPa,在平均地层压力为34 MPa条件下,调整采气量范围为-16.7%~22.5%;在应急调峰工况下,去掉地面约束条件,模型计算结果的收敛性更好。【结论】储气库采气量多目标优化预测模型可为多周期储气库多目标优化提供决策依据,保障储气库的高效运行。但该优化模型主要考虑技术因素,未考虑经济成本分析,后续研究可进一步结合实际使用成本,开展考虑更多因素的储气库采气量优化研究。(图4,表5,参22)[Objective] The operation of underground gas storage is a systematic project.Its major concerns involve economic benefits,technical risks,work efficiency,and many other aspects.The gas injection-production optimization of gas storage involves many factors and is required in the entire process of the gas storage operation.However,previous studies mainly focus on single-factor optimization and few efforts were made to constrained multi-objective optimization.[Methods] Based on the multi-objective optimization algorithm NSGA-Ⅱ model,a multi-objective optimization function was established,and multiple stratum-wellbore-surface constraint variables were set.In addition,based on actual production data from 11 wells in Block 2 of Wen 23 Gas Storage,various constraints such as sand flow,coning flow,erosion flow,liquid carrying flow,surface equipment limited flow,and export pressure were set to carry out multi-objective optimization simulation.The multi-objective optimization prediction model was used to simulate and optimize the conventional gas production plan and the emergency peak shaving plan.Two hundred times of iterations were performed to calculate the optimal flow range.The data of singlewell gas production under different constraints were compared.[Results] In six conventional gas production plans,the stratum production ratios varied greatly,and various constraints directly affected the production control of gas recovery wells of the gas storage.The singlewell gas production at the average stratum pressure of 34 MPa,when compared with that at 36 MPa,changed in the range of -16.7% to 22.5%.Under emergency peak shaving conditions,when the surface constraints are removed,the results calculated by the model had better convergence.[Conclusion] The multi-objective optimization prediction model for gas production of gas storage aims to provide a decisionmaking basis for the multi-objective optimization of multi-cycle gas storage and to ensure the efficient operation of gas storage.However,this optimization model mainl

关 键 词：储气库 多目标优化 约束条件 平均地层压力 应急调峰 

分 类 号：TE82[石油与天然气工程—油气储运工程]