Interpretation of Gas/Water Relative Permeability of Coal Using the Hybrid Bayesian-Assisted History Matching: New Insights
Interpretation of Gas/Water Relative Permeability of Coal Using the Hybrid Bayesian-Assisted History Matching: New Insights
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使用混合贝叶斯辅助历史匹配解释煤的气/水相对渗透率：新见解
DOI：
10.3390/en14030626
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发表时间：
2021-01
期刊：
影响因子：
3.2
通讯作者：
Elsworth Derek
中科院分区：
文献类型：
--
作者：
Zhang Jiyuan;Zhang Bin;Xu Shiqian;Feng Qihong;Zhang Xianmin;Elsworth Derek
煤对气、水的相对渗透率对多相流采煤过程和强化煤层气采煤过程中煤层流体输运都有深远的影响。用Johnson-Bossler-Naumann （JBN）方法解释的非稳态岩心驱油试验是获得煤的相对渗透率的常用方法。然而，JBN方法无法捕获多种气-水-煤相互作用机制，这不可避免地导致相对渗透率估计不准确。利用贝叶斯自适应直接搜索（BADS）算法，提出了一种改进的辅助历史匹配框架，用于从非稳态水驱试验数据中解释煤的相对渗透率。验证结果表明，BADS算法在收敛速度上明显快于现有算法。在端效应数<0.56的情况下，该方法可以准确再现真实的相对渗透率曲线，而无需假设端点饱和度。相比之下，常规JBN方法在可比条件下产生了异常解释结果（估计的原生水饱和度比真实值高约33%，终点水/气相对渗透率仅为真实值的约0.02）。对于具有多种流体-岩石相互作用机制的气-水-煤系统，本文提出的框架是JBN方法的一种有希望的计算有效替代方法。
The relative permeability of coal to gas and water exerts a profound influence on fluid transport in coal seams in both primary and enhanced coalbed methane (ECBM) recovery processes where multiphase flow occurs. Unsteady-state core-flooding tests interpreted by the Johnson–Bossler–Naumann (JBN) method are commonly used to obtain the relative permeability of coal. However, the JBN method fails to capture multiple gas–water–coal interaction mechanisms, which inevitably results in inaccurate estimations of relative permeability. This paper proposes an improved assisted history matching framework using the Bayesian adaptive direct search (BADS) algorithm to interpret the relative permeability of coal from unsteady-state flooding test data. The validation results show that the BADS algorithm is significantly faster than previous algorithms in terms of convergence speed. The proposed method can accurately reproduce the true relative permeability curves without a presumption of the endpoint saturations given a small end-effect number of <0.56. As a comparison, the routine JBN method produces abnormal interpretation results (with the estimated connate water saturation ≈33% higher than and the endpoint water/gas relative permeability only ≈0.02 of the true value) under comparable conditions. The proposed framework is a promising computationally effective alternative to the JBN method to accurately derive relative permeability relations for gas–water–coal systems with multiple fluid–rock interaction mechanisms.
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影响因子：
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作者：
A. Fayazi;H. Bagherzadeh;A. Shahrabadi
通讯作者：
A. Fayazi;H. Bagherzadeh;A. Shahrabadi
DOI：
10.2118/173198-ms
发表时间：
2015-02
期刊：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
Hyungjun Yang;Junyi Kim;J. Choe