Modeling Fluid Flow in Tight Unconventional Reservoirs: Micro/Nano Scale Approach

Rabab Qaddoura, M. Aldhuhoori, Hamda Alkuwaiti, H. Belhaj
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Abstract

The need for a tool to predict transport phenomena in petroleum unconventional tight reservoirs is placing more stringent demand on establishing more realistic models beyond the currently used viscous and inertial dependent models. Since diffusion is the principal mechanism in tight unconventional reservoirs that take place in both Micro and Nano scales, a diffusive term was added to the diffusivity model that operates both viscous and inertial forces, introduced by (Belhaj, et al., 2003). This diffusive term is a modified Fick’s 1st Law. It counts for the flow velocity caused by the diffusion process. Using the three-term model as a rate equation, in addition to the continuity equation and the EOS, a new model (a form of PDE) has been developed. The new model works ideally in unconventional tight reservoirs where oil and/or gas flow. The model has been numerically solved and tested. A comprehensive parametric study has been conducted and revealed clear trends. It has been concluded that diffusion mechanism contribution to flow increases with low permeability of the medium and low viscosity of the flowing fluid. An index (a combination of permeability and viscosity) has been developed and used to verify the influence and impact of the diffusion forces.
非常规致密储层流体流动建模:微纳米尺度方法
除了目前使用的黏性和惯性依赖模型之外,对非常规致密油储层输运现象预测工具的需求对建立更真实的模型提出了更高的要求。由于扩散是致密非常规储层在微观和纳米尺度上发生的主要机制,因此(Belhaj等,2003)在扩散系数模型中加入了一个扩散项,该模型同时考虑了粘性和惯性力。这个扩散项是对菲克第一定律的修正。它计算的是由扩散过程引起的流速。利用三项模型作为速率方程,除了连续性方程和EOS之外,还建立了一个新的模型(PDE的一种形式)。新模型在油气流动的非常规致密储层中效果理想。对模型进行了数值求解和验证。进行了全面的参数研究,并揭示了明确的趋势。结果表明,介质渗透率越低,流动流体粘度越低,扩散机制对流动的贡献越大。一个指数(渗透率和粘度的组合)已被开发出来并用于验证扩散力的影响和影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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