Coupling of Modified Equation of State and Percolation Theory to Study Static and Dynamic Non-Equilibrium Phase Behavior of Heavy Oil in the Presence of Porous Medium

修正状态方程与渗流理论耦合研究多孔介质中稠油静态和动态非平衡相行为

• 批准号: RGPIN-2019-06103
• 负责人: Jia, Na
• 金额: $ 2.21万
• 依托单位: University of Regina
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=683714
• 关键词: Coupling; Modified; Equation; State; Percolation

Non-equilibrium thermodynamic phase behavior normally exists for high viscous crude oil during the primary depletion process. Previously, phase behavior studies for heavy oil were generated in the bulk phase; however, it cannot represent a similar situation in the presence of porous medium, which creates cause for concern as to the accuracy of the information. ******In this research study a systematic and comparative workflow is proposed to combine experimental and numerical approaches to the study of the static and dynamic non-equilibrium phase behavior of live heavy oil in the porous medium. For the experimental part, the high temperature and high pressure phase tests will be performed for heavy oil systems in a sand-pack filled physical model connected to a visual pressure cell, and the self-designed and manufactured micromodel. The injected recombined live oil will go through the pressure depletion processes, and the fluid phase non-equilibrium and equilibrium will be controlled by varying the depressurization rate. At each pressure, the total fluid volume, evolved gas phase, and the interfacial properties such as interfacial tension and interfacial area, capillary pressure, etc. will be determined and analyzed directly or indirectly. The sand-pack model will be scanned by using an ultrasonic apparatus to determine the fluid phase distribution at the test conditions. The remaining liquid phase will be further depressurized to continue the “differential liberation test”. The aforementioned sand pack and micromodel tests will be repeated in the scenario of dynamic condition. ******The numerical simulation will begin by developing a modified EOS which incorporates the classical statistical mechanical potential formulae and grand canonical partition function considering the molecule-molecule interactions. A combination of modified thermodynamic EOS with the material/energy balance and percolation theory is presented to facilitate the accurate description of non-equilibrium heavy oil systems. At each time step under different depressurization rate, the mass, momentum and energy balance of bulk phases and the interfacial material exchanges will be combined into the overall calculation matrix with appropriate initial and boundary conditions. It will be solved with fully implicit and Newton-Raphson methods. The component distribution in each phase and respective fluid properties will be determined. The experimentally measured data is compared to the formulated mathematical models of the non-equilibrium heavy oil system. ******In general, a new methodology will be developed to describe the phase behavior and property changes of non-equilibrium states in the presence of bulk phase by combining the equation of state with the percolation theory. This particular study captures the full journey of fluid phase transition from non-equilibrium to equilibrium at both macroscopic and microscopic levels for heavy oil systems in the presence of porous medium.**

在初级耗竭过程中，通常存在高粘性原油的非平衡热力学相行为。以前，重油的相行为研究是在散装期产生的。但是，在存在多孔介质的情况下，它不能代表类似的情况，这引起了人们对信息准确性的关注。 *****在这项研究中，提出了系统和比较的工作流程，以将实验和数值方法结合起来，以研究多孔培养基中活重油的静态和动态非平衡相行为。对于实验部件，将在与视觉压力电池连接的沙包填充的物理模型以及自设计和制造的微型电池的填充物理模型中对重油系统进行高温和高压相测试。注入的重组活油将通过压力耗尽过程，流体相的非平衡和平衡将通过改变降压率来控制。在每种压力下，将直接或间接地确定和分析，在每个压力下，总流体体积，进化的气相以及界面特性，例如界面张力和界面面积，毛细管压力等。通过使用超声波设备来确定测试条件下的流体相分布，将扫描沙子模型。其余的液相将进一步降低，以继续“差异解放测试”。在动态条件的情况下，将重复进行理性的沙子包和微型模型测试。 *****数值模拟将开始开发一个修改的EOS，该EOS结合了考虑分子 - 分子相互作用的经典统计机械电位公式和大规范分区功能。提出了改进的热力学EOS与材料/能量平衡和成员理论的结合，以促进对非平衡重油系统的准确描述。在不同的下降速率下的每个时间步长，块相和界面材料交换的质量，动量和能量平衡将与适当的初始和边界条件合并为整体计算矩阵。它将通过完全隐式和牛顿 - 拉夫森方法来解决。将确定每个阶段和相对流体特性中的组件分布。将实验测量的数据与非平衡重油系统的制定数学模型进行了比较。 *****通常，将开发一种新方法来描述在存在批量相位的情况下，通过将状态方程与百分比理论相结合，在存在批量相位的情况下的相位行为和属性变化。这项特殊研究捕获了从非平衡到在宏观和显微镜水平上的液位相过渡到在存在多孔培养基的情况下的平衡的过程。**