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Implementation of a multi-layer radiation propagation model for simulation of microwave heating in hydrate reservoirs
International Journal of Numerical Methods for Heat & Fluid Flow ( IF 4.2 ) Pub Date : 2021-05-17 , DOI: 10.1108/hff-12-2020-0822
Akash K. Gupta , Rahul Yadav , Malay K. Das , Pradipta K. Panigrahi

Purpose

This paper aims to present the implementation of a multi-layer radiation propagation model in simulations of multi-phase flow and heat transfer, for a dissociating methane hydrate reservoir subjected to microwave heating.

Design/methodology/approach

To model the induced heterogeneity due to dissociation of hydrates in the reservoir, a multiple homogeneous layer approach, used in food processes modelling, is suggested. The multi-layer model is incorporated in an in-house, multi-phase, multi-component hydrate dissociation simulator based on the finite volume method. The modified simulator is validated with standard experimental results in the literature and subsequently applied to a hydrate reservoir to study the effect of water content and sand dielectric nature on radiation propagation and hydrate dissociation.

Findings

The comparison of the multi-layer model with experimental results show a maximum difference in temperature estimation to be less than 2.5 K. For reservoir scale simulations, three homogeneous layers are observed to be sufficient to model the induced heterogeneity. There is a significant contribution of dielectric properties of sediments and water content of the reservoir in microwave radiation attenuation and overall hydrate dissociation. A high saturation reservoir may not always provide high gas recovery by dissociation of hydrates in the case of microwave heating.

Originality/value

The multi-layer approach to model microwave radiation propagation is introduced and tested for the first time in dissociating hydrate reservoirs. The multi-layer model provides better control over reservoir heterogeneity and interface conditions compared to existing homogeneous models.



中文翻译:

用于模拟水合物储层微波加热的多层辐射传播模型的实现

目的

本文旨在介绍多层辐射传播模型在多相流动和传热模拟中的实现,用于受微波加热的离解甲烷水合物储层。

设计/方法/方法

为了模拟由于储层中水合物分解引起的非均质性,建议在食品加工建模中使用多均质层方法。多层模型被纳入基于有限体积法的内部、多相、多组分水合物分解模拟器中。修改后的模拟器通过文献中的标准实验结果进行了验证,随后应用于水合物储层,以研究含水量和砂介电性质对辐射传播和水合物分解的影响。

发现

多层模型与实验结果的比较表明,温度估计的最大差异小于 2.5 K。对于储层规模模拟,观察到三个均质层足以模拟诱导的非均质性。沉积物的介电特性和储层的含水量对微波辐射衰减和整体水合物分解有显着贡献。在微波加热的情况下,高饱和度储层可能并不总是通过水合物的分解来提供高的气体采收率。

原创性/价值

在解离水合物储层中首次引入并测试了模拟微波辐射传播的多层方法。与现有的均质模型相比,多层模型可以更好地控制储层非均质性和界面条件。

更新日期:2021-05-17
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