分时电价下油田分压周期注水优化研究

Optimization of Partial-Pressure Periodic Water Injection in Oilfield under Time-of-Use Electricity Price

为降低由各注水井需求压力不一致导致的阀组节流损失,以泵站总能耗成本最低为目标函数,以站内泵机组及站外注水井服务要求为约束条件,借助数学规划和优化高级建模系统(GAMS)建模编程,调用内嵌分枝减小最优化导航(BARON)求解器求解,建立了一种分时电价下分压周期注水的数学模型。针对实际注水情况,考虑各压力范围注水井组交叉注水与顺次注水2种运行方案,通过对比分析确定了最佳注水方案。研究结果表明,优化后低压注水井组节流损失平均降低约7 MPa,中压注水井组节流损失平均降低约3 MPa,分时分压周期注水方式一周期内能耗成本可降低约13000元,极大降低了现场因节流损失带来的能耗成本,具有良好的经济效益。同时,顺次注水相较交叉注水具有更好的实用价值与可操作性,可为现场实际运行生产提供一定参考。

In order to reduce the throttling loss of the valve group caused by the inconsistent demand pressure of each water injection well,a mathematical model of partial-pressure periodic water injection under time-of-use(TOU)electricity price was established.The model took the lowest total energy consumption cost of the pump station as the objective function and the service requirements of the pump assembly in the station and water injection well outside the station as the constraint conditions.Modeling programming was performed with mathematical planning and a optimization general algebraic modeling system(GAMS).The embedded branch-and-reduce optimization navigator(BARON)solver was called to solve the problem.According to the actual water injection situation,two operation schemes of cross water injection and sequential water injection were considered in each pressure range,and the best water injection scheme was determined by comparative analysis.The results show that after optimization,the average throttling loss of low-pressure and medium-pressure water injection well group is reduced by about 7 MPa and 3 MPa,respectively.The partial-pressure periodic water injection under TOU electricity price has good economic benefits,which can reduce the energy consumption cost within one period by about 13000 yuan and greatly reduce the energy consumption cost caused by throttling loss in site.Compared with cross water injection,sequential water injection has better practical value and operability and can provide some reference for the actual operation and production of the site.