交替聚合物数值模型试井分析方法

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交替聚合物数值模型试井分析方法

Advances in Geo-Energy Research, 2019, 3(1): 94-103

原文网址: http://www.astp-agr.com/index.php/Index/Index/detail?id=105

      本文提出一种交替聚合物复合数值模型的试井解释方法，并通过中石油公司提供的现场试井资料进行了验证，考虑了聚合物剪切、扩散、对流、不可及空隙体积以及渗透率下降对聚合物流变性的影响，进行了聚合物浓度与黏合分布的研究。建立了考虑聚合物井筒存储于表皮效应的压力数学模型，通过数值求解得到了试井典型曲线，并进行了参数敏感性分析。典型曲线可以分为七个部分，由于不同区域流体黏度的差异，高低浓度水解聚丙烯酰胺过渡带、高浓度水解聚丙烯酰胺与原油过渡带的压力导致曲线呈现出明显的上翘特征。地层参数与聚合物溶液黏度分布可以通过试井曲线拟合获得，通过聚合物驱现场试井资料证明了三区复合交替聚合物驱模型在陆上油田试井解释中的适用性与应用潜力。

A numerical model to evaluate formation properties through pressure-transient analysis with alternate polymer flooding

Jia Zhang, Shiqing Cheng, Changyu Zhu, Le Luo

(Published: 2019-01-05)

CorrespondingAuthor and Email: Shiqing Cheng, chengsq973@163.com; ORCID: https://orcid.org/0000-0001-5267-5569

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Citation: Zhang, J., Cheng, S., Zhu, C., Luo, L. A numerical model to evaluate formation properties through pressure-transient analysis with alternate polymer flooding. Advances in Geo-Energy Research, 2019, 3(1): 94-103, doi: 10.26804/ager.2019.01.08.

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ArticleType: Original article

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Abstract：

      A numerical pressure transient analysis method of composite model with alternate polymer flooding is presented, which is demonstrated by field test data provided by China National Petroleum Corporation.  Polymer concentration distribution and viscosity distribution are obtained on the basis of polymer rheological model, considering shear effect, convection, diffusion, inaccessible pore volume and permeability reduction of polymer. Pressure analysis mathematical model is established by considering wellbore storage effect and skin effect. Type curves are then developed from mathematical model which have seven sections and parameter sensitivity is analyzed, among which the transient sections of low-concentration and high-concentration hydrolyzed polyacrylamides (HPAM) solution, high-concentration  HPAM solution and crude oil show obvious concave shape on pressure derivative curve due to  different viscosities of three zones. Formation parameters and viscosity distribution of polymer solution can be calculated by type-curve matching. The polymer flooding field tests prove that the three-zone composite model can reasonably calculate formation parameters in onshore oilfield with alternate polymer flooding, which demonstrate the application potential of the analysis method.

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Keywords: Alternate polymer flooding, three-zone composite model, pressure transient analysis, type-curve matching.

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