一种油水两相流的拟单相流动模型及其在试井中的应用

Advances in Geo-Energy Research, 2018, 2(2): 218-227

原文网址：http://www.astp-agr.com/index.php/Index/Index/detail?id=66

  利用单相流动模型近似处理多相流动问题有着重要的应用前景。在试井解释方面，很多学者如Perrine、Fetkovich、Raghavan等进行了相关研究。他们的模型仅用总流度代替单相流的流度，存在较大误差，且不能描述饱和度分布。本文综合考虑油水两相的粘度、体积系数、饱和度分布与相渗曲线，通过严格的数学推导，将两相流动简化为新的拟单相流动模型。当饱和度在一定时间内变化小时，新的拟单相流动模型与真正的多相流的流动计算结果几乎相同。因而，新的等效单相流模型数值试井解释、非常规油气流动模拟等方面具有重要的应用前景。

An equivalent single-phase flow for oil-water two-phase flow and its potential application in well test

Wenshu Zha, Daolun Li, Zhiwei Lu, Bao Jia

(Published: 2018-05-09)

CorrespondingAuthor and Email: ldaol@hfut.edu.cn

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Citation: Zha, W., Li, D., Lu, Z., Jia, B. An equivalent single-phase flow for oil-water two-phase flow and its potential application in well test. Advances in Geo-Energy Research, 2018, 2(2): 218-227, doi: 10.26804/ager.2018.02.09.

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ArticleType: Original article

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Abstract：

     In this work an equivalent single-phase flow model is proposed based on the oil-water twophase flow equation with saturation-dependent parameters such as equivalent viscosity and equivalent formation volume factor. The equivalent viscosity is calculated from the oil water relative permeability curves and oil-water viscosity. The equivalent formation volume factor is obtained by the fractional flow of the water phase. In the equivalent single-phase flow model, the equivalent viscosity and phase saturation are interdependent when the relative permeability curves are known. Four numerical experiments based on PEBI grids show that equivalent single-phase flow has a good agreement with the oil-water two-phase flow, which shows that the equivalent single-phase flow model can be used to interpret oil-water two-phase pressure data measured in the wellbore during the buildup period. Because numerical solution of single-phase flow model is several times faster than that of the two-phase flow model, whether the new model interprets the pressure data directly or offers good initial values for the true oil-water two-phase pressure data interpretation, it will obviously improve the efficiency of the interpretation of oil-water pressure data and decrease the burden of engineers.

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Keywords: Equivalent single-phase flow, equivalent viscosity, two-phase flow, numerical well test, PEBI grid.

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