二类油层聚驱措施选井选层方法

Selected wells and formations methods by applying polymer flooding measure in Class II reservoir

针对聚合物驱二类油层注聚井段长、层数多、平面及纵向非均质性严重、选择压裂井(层)难度大的问题,应用精细地质研究成果及数值模拟技术对油井压裂前后试井曲线形态、地层参数(包括表皮系数、渗透率、地层压力、流动系数等)以及压开层的变化规律进行研究,确定了二类油层聚驱措施时机及选井选层方法。实践证明,利用这套措施选井选层方法,在含水下降期和低含水稳定期进行措施压裂是有效可行的。

Aiming at the problems such as long polymer injection interval, several layers, serious heterogeneity in plane and vertical, difficulty to select fracturing well, test well crave type, formation parameters including skin factor, permeability, formation pressure and flow coefficient, and variety rules of fractured formations before and after fracturing are analyzed by using fine geologic study results and numerical simulation results to determine polymer flooding time in Class Ⅱ reservoir and method for well and formation selection. Application demonstrates that this method is effective and feasible to perform stimulation fracturing in the stage of water-cut declining and steady low water-cut.