Th-CENS融合实验与数值模拟对岩石驱替NMR信号的量子偶极耦合热校正
Quantum Dipolar Coupling Thermal Correction for NMR Signal during Natural Rock Flooding by Melding Experimentation and Numerical Simulation (Th-CENS)
摘要：
研究人员已经利用核磁共振技术测量了天然岩石多孔介质中多相流体的饱和度和分布。然而，随着温度的升高，NMR信号的幅度受到降低。主要原因是横向Overhauser效应，其中加热增加了离子运动的自由度，通过使两个自旋在两个相反的方向上形成偶极耦合来影响自旋行为。本文采用实验和数值模拟相结合的方法，对解决核磁共振热效应校正问题进行了探讨。利用核磁共振技术对白垩系碳酸盐岩多相流进行了研究。我们对注水系统沿注水路径的入口、中心和出口四个不同部分进行了时间步长的现场温度测量。此外，我们还对NMR设备径向轴进行了温度测量，代表永磁体温度。为了优化生成校正模型，我们建立了一个三维圆柱形热量传送模型，用于模拟NMR上的热效应分布的数值模拟器。模拟器提供的洞察力提高了对天然岩石岩心塞热分布的理解，以产生更好的热校正模型，该模型融合了实验和模拟，我们称之为Th-CENS。
英文摘要：
Researchers have used NMR to measure multi-phase fluid saturation and distribution inside porous media of natural rock. However, the NMR signal amplitude suffers reduction with the increase of temperature. The main reason is the Transverse Overhauser Effect, where heating increases the freedom for ionic motion, affecting spinning behavior by having two spins go in two opposite directions to form the Dipolar Coupling. We approach solving NMR thermal effects correction by melding experimentation and numerical simulation method. We use NMR for Cretaceous carbonate rock multi-phase flow research. We conduct time step in-situ temperature measurement for four different sections of the flooding system at the inlet, center, and outlet along the flooding path. In addition, we conduct a temperature measurement at the NMR device radial axis, representing the permanent magnet temperature. We build a 3D cylindrical heat transfer model for the numerical simulator that simulates thermal effect distribution on the NMR for optimally generating the correction model. The insight provided by the simulator improved the understanding of the thermal distribution at the natural rock core plug to produce a better thermal correction model that meld experimentation and simulation, a method we call Th-CENS.
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