非饱和油田白垩渗透特性的试验研究

he oil permeability and influencing factors in unsaturated petroleum chalk were studied through experiments with a specially improved constant-head permeameter, whose feature is available to control the matrix suction with axis-translation technique. The results show that, there are close relationships among the permeability, stress, hydraulic pressure and matrix suction. With the development of stress, both the void ratio of chalk and oil permeability decrease, which presents evident pressure-sensitive effect. The oil permeability drops down with the rising of hydraulic pressure. The water-flooding in oil reservoir may raise the water content in chalk, which make the matrix suction and oil permeability decrease consequently. The results obtained above can be reference to the operation for maximizing the oil recovery in petroleum production.