考虑启动压力梯度和应力敏感的页岩油井产能分析

发布时间：2018-03-20 16:38

本文选题：页岩油　切入点：启动压力梯度　出处：《石油钻探技术》2017年05期 　论文类型：期刊论文

【摘要】：为研究启动压力梯度及应力敏感效应对页岩油井产能的影响规律,基于油气水三相渗流模型,建立了考虑启动压力梯度和应力敏感效应的页岩油渗流数学模型,给出了数值求解方法,并编制了页岩油藏数值模拟器。利用页岩油藏数值模拟器分析了启动压力梯度和应力敏感效应对多级压裂页岩油水平井产能的影响规律。页岩油藏数值模拟器退化计算结果与Eclipse软件的计算结果基本吻合,验证了模拟器的准确性。数值模拟结果表明:当启动压力梯度达到0.5MPa/m时,生产10 000d的累计产油量为无启动压力梯度时的24.7%;当应力敏感系数由0.1MPa-1升至0.5MPa-1时,生产10 000d时储层近井地带的渗透率降低近一个数量级,累计产油量为无应力敏感效应时的36.2%;同时考虑启动压力梯度和应力敏感效应时,累计产油量更低。研究结果表明,启动压力梯度和应力敏感效应对页岩油井的产能均有较大的抑制作用,如不考虑启动压力梯度和应力敏感效应会过高估计页岩油井的产能,页岩油藏数值模拟器可为页岩油藏的开发提供指导。
[Abstract]:In order to study the effect of starting pressure gradient and stress sensitivity effect on shale oil well productivity, a mathematical model of shale oil percolation considering start-up pressure gradient and stress sensitivity effect is established based on the oil-gas-water three-phase seepage model. The numerical solution method is given. The influence of starting pressure gradient and stress sensitivity effect on productivity of multistage fracturing shale oil horizontal well is analyzed by using shale reservoir numerical simulator. The calculated results are in good agreement with those of Eclipse software. The accuracy of the simulator is verified. The numerical simulation results show that when the starting pressure gradient reaches 0.5 MPA / m, the cumulative oil production of 10 000 days is 24.775 when the starting pressure gradient is no starting pressure gradient, and when the stress sensitivity coefficient increases from 0.1 MPA ~ (-1) to 0.5 MPA ~ (-1), The permeability of the reservoir near well area is reduced by nearly one order of magnitude, and the cumulative oil production is 36.2 percent of that of the non-stress sensitive zone, and the cumulative oil production is even lower when considering the starting pressure gradient and stress sensitivity effect at the same time. Both start-up pressure gradient and stress sensitivity effect can inhibit the productivity of shale wells. For example, if the start-up pressure gradient and stress sensitivity effects are not considered, the productivity of shale wells will be overestimated. The numerical simulator of shale reservoir can provide guidance for the development of shale reservoir.
【作者单位】：中国石油大学(华东)油气渗流研究中心;中海油研究总院;
【基金】：国家自然科学基金项目“页岩油气多尺度渗流特征与开采理论”(编号:51490654) 中海石油(中国)有限公司综合科研项目“海外页岩油气产能评价技术与方法研究”(编号:YXKY-2016-ZY-03) 中央高校基本科研业务费专项资金“页岩油储层多尺度数字岩心构建及流动机制研究”(编号:17CX02008A) 国家科技重大专项“基于数字岩心的页岩气藏微观流动模拟及产能评价方法研究”(编号:2016ZX05061-14)联合资助
【分类号】：TE328

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