驱替实验中油相核磁共振T2谱表征方法

利用核磁共振T₂谱可以直观地反映出岩心的孔喉大小、分布及岩心中流体的分布状态、可动流体含量等信息,是研究孔隙结构及流体分布的一种重要的实验方法,而渗流实验是研究储层渗流能力、残余油分布、驱油效率等重要的开发实验。结合油–水两相渗流实验和核磁共振T₂谱,用MnCl₂溶液(锰水)对岩心进行驱替,发现用锰水驱替后可以较好地屏蔽岩心中水的核磁信号,且锰水驱替相比于锰水浸泡具有更好的屏蔽效果,锰水驱替实验还可以反映出饱和油和残余油的核磁信号,为研究残余油的分布提供一种较为直观的实验方法。

Characterization method of oil phase NMR T_2 spectrum in displacement experiment

Nuclear magnetic resonance T_2 spectrum can directly reflect the size and distribution of core pore roar, the distribution state of fluid in rock core and the content of movable fluid. It is an important experimental method to study pore structure and fluid distribution, while the seepage experiment is an important development experiment to study reservoir seepage ability, residual oil distribution, oil displacement efficiency and so on. Combined with the oil-water two-phase seepage experiment and nuclear magnetic resonance T_2 spectrum, the core is displaced with a solution of MnCl_2(manganese water). It was found that the nuclear magnetic signal of water in the core can be better shielded by manganese water displacement, and manganese water displacement has better shielding effect than manganese water immersion. Besides that, manganese water displacement experiment can also reflect the nuclear magnetic signals of saturated oil and residual oil,which provides a more intuitive experimental method for studying the distribution of residual oil.