油藏模型工作制度的优化新方法

A New Optimization Method of Reservoir Model Working System

油藏模型的精细预测是编制油田开发方案、油藏动态分析及开发方案设计或调整的重要环节。目前油藏数值模拟工作制度的设计只是涵盖了初期和末期的产量设计,未能考虑中期阶段中提液时机和幅度的设计。针对分段稳步提液的油田,若无法实现中间阶段设计会导致油井实际生产效果与设计误差大,后期难评定新井的真实效果,方案中工作制度的设计对现场的实施操作指导性弱。针对以上问题,通过系统分析MM油田百余口油井实际工作制度,提出模拟工作制度分初、中、末三阶段,初、末两个阶段需细化出不同地质油藏条件下的单井预测条件,中期设计中创新性采用“多变量联动”设计技术,在模型输入参数和输出结果间引入虚拟模型估算器,新方法以结构化和自动化的方式首次实现了中期阶段工作制度的高速高效模拟。

The precise forecasting of reservoir using reservoir simulation modelling is the most essential step for oilfield development design,production dynamic analysis,and the late well pattern adjustment.Nowadays,most reservoir simulation modelling design focus on giving production rules to just early and late stage,which neglect the liquid rate enhancement design in the middle stage.For some offshore reservoirs,liquid rate enhancement method is applied periodically.The lack of those actions in the simulation forecasting will lead to a huge a difference between the forecasting and the real production,which means the situation of new applied wells will be unpredictable.Therefore,after analyzing the working rules and production history of more than a hundred wells in the MM oilfields,a new theory is developed.The production forecasting is divided to three stages.During the simulation forecasting,production rules will firstly be applied to the early and late stage in purpose of matching reservoir geological conditions.After that,the new multi-parameter optimization technology is applied in the middle stage simulation by introducing an algorithm-based estimator to the simulator.The output shows successfully realize structural and automatic optimization of the liquid rate enhancement design in the middle stage.