多层水驱油藏均衡驱替注采参数协同优化方法

Collaborative optimization method of injection andproduction parameters for multi-layer reservoirsbased on balanced water flooding

由于储层非均质性及开发措施的影响,易造成水驱过程驱替不均衡。基于统计学方法,提出了采用克里斯琴森均匀系数定量评价多层水驱油藏开发过程中均衡驱替程度,以最大化均衡驱替为目标建立了分层注采参数优化数学模型,采用协方差矩阵自适应智能进化算法进行求解,形成了多层水驱油藏注采参数协同优化方法,并通过实例验证了方法的可靠性。将建立的新方法应用于胜利油区胜坨油田坨142油藏典型井组,通过对比智能协同分层注采参数优化前后结果,相比于原始方案克里斯琴森均匀系数提高了3.49%,累积产油量增加1.024×10^(4)m^(3),同时含水率降低1.34%。表明该方法可以精准地控制各层间的配产和配注,有效地改善水驱油藏层间和井间的均衡驱替状况,实现注采参数和剩余油分布的精准匹配。

Unbalanced water flooding can easily occur due to the infuence of reservoir heterogeneity and development measures.Based on the statistical method,the Christiansen uniformity coefficient is used to quantitatively evaluate the balanced water flood-ing degree during the development of multi-layer reservoirs.Amathematical model for optimizing multi-layer injection and production parameters is established to maximize balanced water flooding,and the covariance matrix adaptive intelligent evolution algorithm is used to solve the problem.Acollaborative optimization method ofinjection and production parameters for multi-layer reser-voirs based on water flooding is developed,and its reliability is verified by an example.The new method is applied to the typicalwell group of Shengtuo T142 reservoir in Shengli Oilfield.By comparing the results before and after the optimization ofintelligentcollaborative stratified injection and production parameter,it is found that the Christiansen uniformity coefficient by the originalscheme is improved by 3.49%.The cumulative oil production is increased by 1.024×10^(4)m^(3),and the water cut is decreased by1.34%.Theresults show that this method can accurately control the production and injection allocation between layers,effectively improve the balanced water flooding between layers and wells,and realize the accurate matching between injection and productionparameters and remaining oil distribution.