Experiments of fluid diversion ability of a new waterproofing polymer solution

Low-permeability inhomogeneous reservoir displacement experiments were conducted using new waterproofing polymer solution GPS-1, and its fluid diversion ability was analyzed. There were three types of displacement experiments (nine experiments in total) in homogeneous cores, inhomogeneous oil- and water- saturated cores. Experimental results show that, compared with the initial polymer solution, the penetrating and water insulating abilities of the GPS-1 improve significantly, the pressure gradient of injection reduces by half, and both the water pressure gradient and the residual resistance factor increase considerably when water-isolating screen destructs. GPS-1 can create a durable waterproofing screen, thus increasing the oil displacement efficiency of water flooding for inhomogeneous layers. The water-isolating ability and oil displacement efficiency is increased greatly by injecting the GPS-1 with fringes of chloride calcium solution. The action selectivity of the GPS-1 is shown not only in formation of the water insulating screen mainly in water-saturated interlayers and effectively blocking high-permeability washed interlayer, but also in acceleration performance for injection wells due to the penetration of more injected water into highly productive intervals.