| 特高含水期多层非均质油藏层间干扰因素分析 |
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| 作者姓名： | 安伟煜 |
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| 作者单位： | 大庆油田有限责任公司勘探开发研究院 |
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| 基金项目： | 大庆油田4000万吨持续稳产关键技术重大专项(DQP-2011-YC-KY-011) |
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| 摘 要： | 为解决特高含水期多层非均质油藏层间矛盾,分析多层油藏非均质性对采出程度、注入孔隙体积倍数、产液量和含水率等指标的影响,建立多层油藏非活塞式驱油模型,计算水驱前缘两端的渗流阻力和各层产液量的动态变化;采用达西定律和等饱和度面移动方程,分时间段计算各层采出程度和注入孔隙体积倍数.结果表明,层间非均质性对开发效果有显著影响.高渗透率层产液量高、采出程度高,突破以后采出程度增长减缓;低渗透率层受高渗透率层的影响,采出程度较低.层间非均质性及油水流度的差异是造成层间矛盾的根本原因,在油田开发初期,层间非均质性起主要作用;在油田开发后期,尤其是特高含水期,油水流度比的作用逐渐增大.该结论对油田高效经济的开发具有一定指导意义.
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| 关 键 词： | 特高含水期 多层油藏 非均质 层间干扰 采出程度 注入孔隙体积倍数 |
Interference mechanism of multilayer heterogenous reservoir in high water-cut stage |
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| Authors: | AN Wei-yu |
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| Institution: | AN Wei-yu(Exploration and Development Research Institute,Daqing Oilfield Corp.Ltd.,Daqing,Heilongjiang 163712,China) |
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| Abstract: | Contradiction between layers is an important reason that restrict the development of heterogenous reservoir in high water-cut stage.Unpiston like flow model in multilayer reservoir was established in order to study the influence of heterogeneity on displacement efficiency,pore volume injected,recovery,liquid rate and water-cut.The seepage resistance that both before and behind water flooding front can be calculated respectively with the model,then the change of liquid rate in all layers can be studied.Displacement efficiency and pore volume injected can be calculated between different period using Darcy's law and equal saturation surface mobile equation.The result indicated that heterogeneity between layers will effect development result dramatically.The liquid rate becomes larger and displacement efficiency becomes higher with the increase of permeability,but the increase of displacement efficiency will become slower when the layer was broken through.Displacement efficiency of low permeability layers are lower influenced by the high permeability layers.Interlayer heterogenous and mobility ratio are main factors of contradiction between layers.Interlayer heterogenous play a leading role during the early period of oil development.Role of mobility ratio rise in the high water-cut stage.This model can guide us to develop reservoir efficiently and economically to a certain degree. |
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| Keywords: | high water-cut stage multilayer reservoir heterogeneity contradiction between layers displacement efficiency pore volume injected |
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