Estimation of pseudo-relative permeability curves through an analytical approach for steam assisted gravity drainage (SAGD) and solvent aided-steam assisted gravity drainage

Matthew Morte, Berna Hascakir
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引用次数: 10

Abstract

Fluid flow through the reservoir is defined on the basis of the relative permeability which essentially captures the preferential flow of any specific fluid. Utilization of steam assisted gravity drainage (SAGD) presents challenges to the conventional understanding of relative permeability due to the introduction of heat to the reservoir. The presence of three distinct fluid phases (steam, water, and oil) in conjunction with a temperature dependency has many implications for the modelling of complex fluid dynamics. However, effective characterization of relative permeability curves is integral to successful simulation and so a model capable of representing three-phase flow is required. By implementing a simplified fractional flow analysis, this study is able to regress three-phase flow in the laboratory to a pseudo two-phase relative permeability. Modifications of conventional fractional flow theory allow for the extension of the analysis to the SAGD and solvent aided-SAGD (S-SAGD) process. Overall displacement is defined on the basis of both a microscopic component represented by modified capillary number and a macroscopic component represented by mobility ratio. Negation of the liquid-gas interaction through the assumption of waterflooding enables the generation of pseudo two-phase relative permeability curves that result in comparable performance to lab scale experiments. Because the experimentally obtained SAGD and S-SAGD results are used to construct the pseudo-relative permeability curves, our model includes the many complex fundamental changes occur in viscosity and relative permeability during SAGD and S-SAGD in the newly constructed relative permeability curves. Thus, our results offer a simplistic way to ease the compositional simulation of SAGD and S-SAGD through waterflooding approach.

蒸汽辅助重力抽采和溶剂辅助-蒸汽辅助重力抽采拟相对渗透率曲线分析方法
通过储层的流体流动是根据相对渗透率来定义的,相对渗透率基本上捕获了任何特定流体的优先流动。由于将热量引入储层,蒸汽辅助重力泄油(SAGD)的应用对传统的相对渗透率认识提出了挑战。三种不同的流体相(蒸汽、水和油)的存在以及温度依赖性对复杂流体动力学的建模具有许多含义。然而,有效表征相对渗透率曲线是成功模拟的必要条件,因此需要一个能够表示三相流的模型。通过实施简化的分流分析,本研究能够将实验室中的三相流回归到伪两相相对渗透率。对传统分流理论的修改允许将分析扩展到SAGD和溶剂辅助SAGD (S-SAGD)过程。总位移的定义是基于以修正毛细数为代表的微观分量和以迁移率为代表的宏观分量。通过水驱假设否定液气相互作用,可以生成伪两相相对渗透率曲线,从而获得与实验室规模实验相当的性能。由于实验得到的SAGD和S-SAGD结果用于构建伪相对渗透率曲线,因此我们的模型在新建的相对渗透率曲线中包含了SAGD和S-SAGD过程中粘度和相对渗透率发生的许多复杂的基本变化。因此,我们的研究结果为通过水驱方法简化SAGD和S-SAGD的成分模拟提供了一种简单的方法。
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