Study On Improving The Reservoir Adaptability Of Salt-resisting Polymer And Its Application Effect

In recent years, a series of new polymers were developed in order to adapt the high salinity. Thesepolymers included surface-active polymer, hydrophobically associating polymer and functional polymerwere of an ultra high salt tolerance by changing the molecular configuration from dendritic structure intoreticulation. It improved the viscosity and larger molecular clew diameter of polymer but also causedpoorer reservoir adaptability and more difficulties for injection. The paper studies on the properties ofsalt-resisting polymer such as: viscosity, viscosity average molecular weight, weight average molecularweight, molecular clew diameter, molecular configuration, rheological property, viscoelasticity, flowproperties flooding efficiency, oil recovery and so on, under the guidance of modern reservoir engineeringtheory, physicochemical theory, and analyzing the flooding mechanization at the same time. Theexperiment results show that the regulator (β-cyclodextrins) has a restrain effect on the association betweenthe polymer molecular chains, which is irreversible in solution even be diluted, influences the properties ofthe salt-resisting polymer solution. The rate at which polymer dissolved could speed up with theP-cyclodextrins make it ift the requirement of polymer solution preparation in offshore fields better. Andcompared with the hydrophobically associating polymer solution, the "P-cyclodextrins/polymer" systemhas a better compatibility with reservoir, stronger transmission and migration capacity and higher floodingefficiency. And there is a variation trend of "increasing and decreasing" to he oil recovery of the"P-cyclodextrins/polymer" system, with the β-cyclodextrins concentration increasing, which means thatthere is a preferable quantity range of the amount of β-cyclodextrins addition.