Experimental Investigation of Spontaneous Imbibition in a Tight Reservoir with Nuclear Magnetic Resonance Testing

Hydraulic fracturing is the significant technology for exploiting tight resources. Spontaneous water imbibition is an important mechanism governing the process of hydraulic fracturing, and the water imbibition from the fracture into the matrix is an essential factor that affects the reservoir production performance. In this study, imbibition experiments and nuclear magnetic resonance (NMR) testing were combined to analyze fluid flow tight core samples in a pore-scale level. The imbibition experiments were categorized into two systems, the gas/water/rock system and the oil/water/rock system. The NMR measurements were performed at different times for these two systems. The relationship between T2 relaxation time, pore radius, and pore types was established. Theoretical models describing water imbibition into porous media were used to facilitate the interpretation of the experimental results. The results demonstrate that the volume of imbibed water is large during the early imbibition period and that the imb...

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