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随着油田的持续开发和老油区作业频繁等原因使井况日趋恶化,加上油藏的非均质性,严重影响油田采收率的提高.如在开发区内补打更新井、加密井,其建井周期长、成本高.在套管内侧钻中短半径水平井,不但可以节约钻井成本,而且还可以增大油层裸露面积,提高采收率和经济效益.但若准确选择有利的侧钻井位,需要首先建立累积产油量与侧钻井相关参数的关系.根据建立的数值模拟概念模型和确定的水平井开采方案,用正交设计对有效厚度、无因次距顶高度、油水井距、平均渗透率、平均剩余油饱和度、水平井开采阶段完善程度等6项因素进行了组合,并计算了25个数值模拟方案.利用多元回归,从模拟计算结果得到计算注水正韵律油层10年累积产油量的多元回归公式,可作为下步优选侧钻井位的依据.
With the continual development of the oilfield and the frequent operation of the old oil area, the well conditions worsen, and the heterogeneity of the reservoir seriously affects the improvement of the oil recovery rate. Well, the well construction period is long and the cost is high.Drilling a short radius horizontal well inside the casing can not only save the drilling cost, but also increase the exposed area of the oil layer and improve oil recovery and economic benefits.But if the accurate selection is favorable , We need to first establish the relationship between the cumulative oil production and the parameters related to the side drilling.According to the established numerical simulation conceptual model and the determined horizontal well drilling plan, Water well spacing, average permeability, the average remaining oil saturation, horizontal well completion of six factors were combined, and calculated 25 numerical simulation program.Using multivariate regression, calculated from the results of the calculation is a positive rhythm The multiple regression formula of cumulative oil production in a 10-year reservoir can be used as the basis for optimizing the lateral drilling position in the next step.