特低～超低渗透储层油水渗流效应分析及开发启示
发布时间：2018-07-28 19:39
【摘要】：以鄂尔多斯盆地志丹油田烟雾峁区块延长组长4+5,长6储层为例,基于岩心渗流实验的归一化处理、考虑启动压力梯度、引入有效驱动系数及油水粘度比,将渗流理论与室内实验及生产实践密切结合,综合分析特低~超低渗透储层油水渗流效应,探讨其注水开发启示。结果表明,特低~超低渗透储层渗流特征受启动压力影响,启动压力将导致油井提前见水;当含水饱和度大于某一临界值后,油层含水变化率逐渐减小,无因次采液指数与采油指数之间的分化逐渐加剧,其相对稳定的变化区间则是油层提液增产及调整挖潜的重要机遇期。依据无因次采液、采油指数变化规律及其相应的含水率变化区间,可将特低~超低渗透油层开采过程划分为初产、稳产、有效提液、低效循环等4个阶段;在中高含水期,较高的有效驱动系数有利于油层提液增产;在特高含水后期,较小的有效驱动系数及油水粘度比则有利于油层提高低效循环阶段的最终采收率。流体饱和度不仅对特低~超低渗透油层含水率及采液采油指数等变化具有重要的控制和影响,而且也是导致区块生产差异的主要因素。对于那些饱和度分布不同、平面及层间生产差异比较突出的井区,应依据其所处开采阶段分别采取不同的对策参数,以改善油田整体开发效果。
[Abstract]:Taking Yanchang formation 45 and Chang 6 reservoirs in Yanchang Block, Zhidan Oilfield, Ordos Basin as an example, based on normalized treatment of core percolation experiment, starting pressure gradient is considered, effective driving coefficient and oil-water viscosity ratio are introduced. By combining seepage theory with laboratory experiment and production practice, the oil and water seepage effect of ultra-low permeability reservoir is comprehensively analyzed, and the enlightenment of water injection development is discussed. The results show that the percolation characteristics of ultra-low to ultra-low permeability reservoirs are affected by start-up pressure, and the starting pressure will lead to early water breakthrough in oil wells, and when the saturation of water is greater than a certain critical value, the rate of change of water cut in reservoir decreases gradually. The differentiation between dimensionless fluid recovery index and oil recovery index is gradually aggravated, and its relatively stable range is an important opportunity period for increasing oil production and adjusting potential. According to the variation law of dimensionless fluid recovery, oil recovery index and its corresponding water cut change interval, the production process of ultra-low to ultra-low permeability reservoir can be divided into four stages: initial production, stable production, effective extraction, low efficiency circulation, and in the middle and high water cut period, the oil recovery process can be divided into four stages: initial production, stable production, effective extraction and low efficiency circulation. The higher effective driving coefficient is conducive to increasing oil production, and the smaller effective driving coefficient and oil-water viscosity ratio are beneficial to increase the final oil recovery in the low efficiency cycle stage in the late stage of extra high water cut. Fluid saturation not only has an important control and influence on the changes of water cut and oil recovery index of ultra-low to ultra-low permeability reservoirs, but also is the main factor leading to the difference of block production. For those wells whose saturation distribution is different and the production difference between plane and layer is obvious, different countermeasures should be taken according to the stage of production in order to improve the overall development effect of oil field.
【作者单位】： 西安石油大学地球科学与工程学院;
【基金】：陕西省自然科学基金(2013JM5006) 西安石油大学青年科技创新项目(2012BS010)
【分类号】：TE312
[Abstract]:Taking Yanchang formation 45 and Chang 6 reservoirs in Yanchang Block, Zhidan Oilfield, Ordos Basin as an example, based on normalized treatment of core percolation experiment, starting pressure gradient is considered, effective driving coefficient and oil-water viscosity ratio are introduced. By combining seepage theory with laboratory experiment and production practice, the oil and water seepage effect of ultra-low permeability reservoir is comprehensively analyzed, and the enlightenment of water injection development is discussed. The results show that the percolation characteristics of ultra-low to ultra-low permeability reservoirs are affected by start-up pressure, and the starting pressure will lead to early water breakthrough in oil wells, and when the saturation of water is greater than a certain critical value, the rate of change of water cut in reservoir decreases gradually. The differentiation between dimensionless fluid recovery index and oil recovery index is gradually aggravated, and its relatively stable range is an important opportunity period for increasing oil production and adjusting potential. According to the variation law of dimensionless fluid recovery, oil recovery index and its corresponding water cut change interval, the production process of ultra-low to ultra-low permeability reservoir can be divided into four stages: initial production, stable production, effective extraction, low efficiency circulation, and in the middle and high water cut period, the oil recovery process can be divided into four stages: initial production, stable production, effective extraction and low efficiency circulation. The higher effective driving coefficient is conducive to increasing oil production, and the smaller effective driving coefficient and oil-water viscosity ratio are beneficial to increase the final oil recovery in the low efficiency cycle stage in the late stage of extra high water cut. Fluid saturation not only has an important control and influence on the changes of water cut and oil recovery index of ultra-low to ultra-low permeability reservoirs, but also is the main factor leading to the difference of block production. For those wells whose saturation distribution is different and the production difference between plane and layer is obvious, different countermeasures should be taken according to the stage of production in order to improve the overall development effect of oil field.
【作者单位】： 西安石油大学地球科学与工程学院;
【基金】：陕西省自然科学基金(2013JM5006) 西安石油大学青年科技创新项目(2012BS010)
【分类号】：TE312
【参考文献】
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