存在有限导流断层的条带状油藏试井新模型

发布时间：2019-03-16 10:33

【摘要】：目前对断层封闭性的试井研究主要集中于封闭断层,用现有的试井解释模型对具有非封闭断层尤其是有限导流断层边界的油气藏试井资料进行解释所得到的结果往往并不理想。通过引入界面表皮的概念,建立了条带状油藏中存在有限导流断层的试井解释新模型,模型不仅考虑了流体通过断层面,还考虑了断层内部流体的流动,并利用Fourier余弦变换和Laplace变换等数学物理方法求得了井底压力表达式。绘制了模型的井底压力响应特征曲线,曲线共有7个流动阶段。分析表明,无因次导流能力F_(CD)值越大,曲线下凹程度越大;界面表皮S值越大,曲线上翘程度越大,当S值足够大时,表现为封闭断层的特征;无因次导压系数η_(fD)主要影响压力导数曲线下降的多少;流度比、厚度比、导压系数比主要影响压力导数曲线上升和下降。
[Abstract]:At present, the well testing research on fault sealing mainly focuses on closed faults, and the results obtained by using existing well test interpretation models to interpret well test data of oil and gas reservoirs with non-closed faults, especially finite conductivity fault boundaries, are often not ideal. By introducing the concept of interface epidermis, a new model for well test interpretation with finite conductivity faults in strip reservoirs is established. The model takes into account not only the fluid passing through the fault plane, but also the flow of fluid inside the fault. The Fourier cosine transform and Laplace transform are used to obtain the expression of the bottom hole pressure. The characteristic curves of pressure response at the bottom hole of the model are drawn, and there are seven flow stages of the curves. The analysis shows that the larger the dimensionless conductivity F _ (CD) value is, the greater the concave degree of the curve is, the greater the S value of interface epidermis is, the greater the degree of curve upwarping, and when the S value is large enough, it appears to be the characteristic of closed fault. The dimensionless conductivity 畏 _ (fD) mainly affects the decrease of the pressure derivative curve, the mobility ratio, the thickness ratio and the conductivity coefficient ratio mainly affects the rise and decrease of the pressure derivative curve.
【作者单位】：海洋石油高效开发国家重点实验室;中海油研究总院;"油气藏地质及开发工程"国家重点实验室·西南石油大学;
【基金】：国家科技重大专项(2011ZX05024-004) 中海油有限公司项目(YXKY-2014-ZY-03)
【分类号】：TE353

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