基于井间连通性的油藏开发生产优化方法

基于连通性思想与最优控制理论,建立了一种新的油藏开发生产优化设计方法。在现有井间连通性模型基础上,通过改进饱和度追踪方法,得到可预测油水动态的连通性模型,使其在处理油田常见液量剧变、关停井、转注等措施带来的流体转向时计算更为精确。在对油藏历史动态进行自动拟合反演后,建立了油藏生产最优控制模型,结合优化算法进行快速求解,最大化经济效益的同时,自动获取最优开发注采方案。概念算例表明,改进后饱和度追踪方法更为精确;实际算例显示,该方法能自动优化油井转注时机,且优化后注采方案能有效控水增油,提高经济开发效益,为现场开发方案设计提供指导。

Reservoir production optimization method based on inter-well connectivity

Based on the inter-well connectivity and optimal control theory, this paper presented a new reservoir production optimization method.According to the existing inter-well connectivity model, the saturation tracing method was improved to obtain the connectivity model for predicting oil and water dynamics, and thus can more accurately calculate the fluid diversion caused by fluid upheaval, well shut-in, converted injection and other commonly-used measures.Through the automatic fitting inversion of dynamic history, the reservoir production optimization control model was established with the optimization algorithm for rapid solution.When maximizing economic benefits, the optimal injection and production scheme can be automatically obtained.The conceptual case demonstrated that the improved saturation tracking method is more accurate.The practical case also indicated that this method can automatically optimize the converted injection timing of oil well; meanwhile, the optimized injection and production scheme is able to effectively control water and increase oil yield, improve the economic development efficiency and provide a reference for on-site development scheme design.