稠油热采三区复合油藏水平井试井解释模型及压力响应特征

发布时间：2018-02-13 17:15

本文关键词： 稠油热采水平井三区复合油藏试井压力动态　出处：《大庆石油地质与开发》2016年06期 　论文类型：期刊论文

【摘要】：针对稠油水平井热采过程中注入蒸汽向外扩散造成的地层岩石及流体性质差异,建立了稠油热采三区复合油藏水平井试井解释模型。通过Laplace变换和Fourier有限余弦积分变换进行降维和齐次化处理求得相应的垂直线源解,再沿水平井方向对此线源解进行压降叠加(积分)得到水平井的条带源解,然后通过取极限得到水平井在拉氏空间的等效线源解,最后经过Stefest数值反演可得到水平井在真实空间的井底压力解。对稠油热采水平井的压力响应特征和参数敏感性进行了分析,结果表明:在测试时间足够长的情况下,稠油热采水平井的压力导数曲线一般具有多个水平段、过渡段和"凸起"等特征,水平段是压力在不同渗流区域传播时的径向流反映,过渡段是压力传播到两区界面时区域流体或地层物性差异的反映,"凸起"是不同渗流区域间弹性储容能力差异的反映。
[Abstract]:In view of the difference of formation rock and fluid properties caused by steam injection and outward diffusion during thermal recovery of heavy oil horizontal wells, A well test interpretation model for horizontal wells in complex reservoirs in three zones of heavy oil thermal recovery is established. The corresponding vertical source solutions are obtained by Laplace transform and Fourier finite cosine integral transform. The strip source solution of horizontal well is obtained by pressure drop superposition (integral) along the horizontal well direction, and the equivalent line source solution of horizontal well in Laplace space is obtained by taking the limit. Finally, the bottom hole pressure solution of horizontal well in real space can be obtained by Stefest numerical inversion. The pressure response characteristics and parameter sensitivity of heavy oil thermal recovery horizontal well are analyzed. The results show that: if the test time is long enough, The pressure derivative curve of horizontal wells for thermal recovery of heavy oil is generally characterized by multiple horizontal sections, transition sections and "bulges". The horizontal section is a reflection of the radial flow of pressure propagating in different seepage regions. The transition section is the reflection of the regional fluid or formation physical property difference when the pressure propagates to the interface of the two zones, and the "bulge" is the reflection of the difference of the elastic storage capacity between the different percolation zones.
【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”(IRT1294) 国家高技术研究发展计划(863计划)“深水油气田智能完井关键技术”(2013AA09A215)
【分类号】：TE345

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