Study on displacement and imbibition law of tight sandstone reservoir

Due to the rapid increase of the world's energy demand, people gradually put the focus of oil and gas development on unconventional. Tight reservoir as an important part of unconventional, how to improve the recovery rate of tight reservoir has become the focus of the times. In this paper, the relationship between oil saturation and recovery rate of tight reservoir is explained by displacement and imbibition experiments on cores with different oil saturation, and the mechanism is explained by nuclear magnetic resonance, which provides direction for improving the recovery rate of tight reservoir.