Coupling mechanisms of displacement and imbibition in pore-fracture system of tight oil reservoir

Abstract

Fracturing and water flooding have been popular technologies to achieve the effective development of tight oil reservoirs in recent years. However, in the late stage of production, the oil recovery rate declines with a rapid increase in the water cut. Water huff-puff could improve reservoir energy; however, the displacement and imbibition in the micronano pore throat and fracture systems are complex processes with unclear characteristics and position. Therefore, it is urgent to study the coupling mechanisms of oil-water displacement and imbibition in tight oil reservoirs. In this work, based on the phase field method of COMSOL Multiphysics software, we establish a two-dimensional microscopic numerical simulation model of the pore-fracture system, and carry out displacementimbibition simulation programs of different injection media (water and surfactant) and injection methods (displacement, displacement-imbibition). By comparing the saturations and pressure distributions of different simulation programs, we analyze the changes in the oil-water interface, and summarize the action conditions of counter-current imbibition and pore throat limit. Finally, reasonable development suggestions are proposed for tight oil reservoirs.

Explicit original gas in place determination of naturally fractured reservoirs in gas well rate decline analysis

“…Meng et al (2020) presented a simple and quick well-testing model for a multi-fractured horizontal well with non-uniform fractures. Pi et al (2023) studied the coupling mechanisms of oil-water displacement and imbibition in tight reservoirs while considering the inter-porosity flow in the porefracture system. Andersen (2023) pointed out that the effect of boundary-dominated flow on diffusion problems can be explained in terms of changes in the self-similar behavior at the open boundary.…”