基于相渗曲线的油藏注入水利用状况评价方法

发布时间：2018-12-19 07:45

【摘要】：针对现有油藏注入水利用状况评价方法不能适应油藏阶段注采比不断变化的问题,提出了基于相渗曲线的油藏注入水利用状况评价方法。首先,根据油藏归一化相渗曲线,确定油藏含水上升规律描述方程。其次,根据油藏不同阶段实际可采储量采出程度,采用由归一化相渗曲线确定的油藏含水上升规律描述方程,计算对应的理论含水率,再结合油藏不同阶段实际注采比,进而计算油藏不同阶段的理论阶段存水率和理论阶段水驱指数偏离量。然后,根据油藏不同阶段实际注采比和实际含水率,计算油藏不同阶段的实际阶段存水率和实际阶段水驱指数偏离量,绘制实际(理论)阶段存水率和实际(理论)阶段水驱指数偏离量随时间的变化曲线。最后,通过对比理论曲线和实际曲线,评价油藏的注入水利用状况。采用该方法对老君庙L油藏西区注入水利用状况进行了评价。结果表明:1970年以前,注入水利用状况较差;1970年以后,注入水利用状况较好。
[Abstract]:Aiming at the problem that the existing evaluation methods of reservoir injection water utilization can not adapt to the changing injection-production ratio in reservoir stage, a reservoir injection water utilization evaluation method based on phase permeability curve is proposed. Firstly, according to the normalized phase permeability curve of the reservoir, the equation of the water cut rising law of the reservoir is determined. Secondly, according to the actual recovery degree of recoverable reserves in different stages of the reservoir, the equation of water cut rising law determined by normalized phase and permeability curve is used to calculate the corresponding theoretical water cut, and combined with the actual injection-production ratio in different stages of the reservoir, Furthermore, the water storage rate in different stages of reservoir and the deviation of water drive index in theoretical stage are calculated. Then, according to the actual injection-production ratio and the actual water cut in different stages of the reservoir, the water storage rate in different stages of the reservoir and the deviation amount of the water drive index in the actual stage are calculated. The curves of water storage rate in actual (theoretical) stage and the deviation of water drive index in practical (theoretical) stage with time are plotted. Finally, the injection water utilization of the reservoir is evaluated by comparing the theoretical curve with the actual curve. This method is used to evaluate the water utilization in the western part of Laojunmiao L reservoir. The results showed that the water use was poor before 1970 and better after 1970.
【作者单位】：重庆科技学院复杂油气田勘探开发重庆市重点实验室;
【基金】：国家科技重大专项“大型油气田及煤层气开发微尺度渗流数学模型的建立与分析”(2016ZX05013001-004)资助
【分类号】：TE357.6

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