裂缝性稠油油藏幂律流体蒸汽吞吐水平井压力动态分析

发布时间：2018-02-23 17:30

本文关键词： 裂缝性油藏双重介质稠油幂律水平井压力动态　出处：《西安石油大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：根据天然裂缝性油藏发育特征、稠油幂律特性以及水平井蒸汽吞吐开采过程中的流体分布特点,分蒸汽波及区和稠油区分别建立了双重介质幂律流体复合油藏水平井的渗流数学模型:蒸汽波及区内的流体为牛顿流体,符合达西定律;稠油区内为幂律流体,为非达西渗流。采用Laplace变换、Fourier有限余弦积分变换等方法对该模型进行解析求解,得到了井底压力的拉氏空间解,并利用Stehfest数值反演方法将拉氏空间解转换为真实空间解。研究表明:裂缝性稠油油藏幂律流体蒸汽吞吐水平井的压力动态复杂,最多会出现9个不同的流动阶段;当压力在牛顿流体区域(内区)内传播时,径向流动阶段压力导数曲线为水平线;在幂律流体区域(外区)内传播时,径向流动阶段的压力导数曲线为互相平行的倾斜直线,直线的斜率由幂律指数决定。
[Abstract]:According to the development characteristics of natural fractured reservoirs, the power law characteristics of heavy oil and the fluid distribution in horizontal wells during steam huff and puff production, The mathematical models of percolation in horizontal wells of dual medium power-law fluid composite reservoir are established in the steam sweep area and heavy oil area, respectively: the fluid in the steam sweep area is Newtonian fluid, which conforms to Darcy's law, and the heavy oil area is power law fluid. For non-Darcy seepage, the Laplace transform Fourier finite cosine integral transform is used to solve the model, and the Laplace space solution of bottom hole pressure is obtained. The Stehfest numerical inversion method is used to transform Laplace space solution into real space solution. The study shows that the pressure performance of power law fluid steam huff puff horizontal well in fractured heavy oil reservoir is complex and there are at most 9 different flow stages. When the pressure propagates in the region of Newtonian fluid (inner region), the pressure derivative curve of radial flow stage is horizontal line, and the pressure derivative curve of radial flow stage is a oblique line parallel to each other when propagating in power law fluid region (outer region). The slope of a straight line is determined by a power law exponent.
【作者单位】：中国石油大学(华东)石油工程学院;
【基金】：长江学者和创新团队发展计划资助“复杂油藏开发和提高采收率的理论与技术”(编号:IRT1294)
【分类号】：TE31

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