Research Of Gel Foam Combined Profile Control And Flooding Technology In Fractured Ultra-low Permeability Reservoir

The1380test area reservoir of Ganguyi oilfield is a typical fractured ultra-lowpermeability reservoir,during the process of waterflooding, the heterogeneity is more andmore serious, and the large hole and crack is developed, which leading to the serious waterchanneling phenomenon and the low recovery rate. However, the conventional profilemethod effect is not ideal, in order to solve the above problems,we presents the gel foamcombined profile control and flooding technology. The gel foam combined profile control andflooding technology can effectively plug the fracture in deep formation,force the fluiddiversion, so as to improve the water injection profile of formation and enhance the sweepefficiency,it also has favorable oil displacement effect.Compared to the single gel foamflooding, it has a longer effective period and a better effect. Therefore, it is important to seek anew profile control and flooding technology in the analysis of such oil adaptability.In this paper, we select out a new intelligent gel system and foaming agent systemthrough the indoor experiment, and evaluate their performance. Among them, the newintelligent gel system has the characteristics of "low viscosity, easy preparation, easy injection,retarded cross-linking, high strength, long valid". We optimize the injection parameters tomake indoor injection scheme, namely the gel and foam slug best injection volume are0.3PVand0.6PV, the order of complex slug is priority into the gel plug and then into the foam slug,the injection of air foam slug is multi-cycle and short slug injection, the indoor double oildisplacement experiment shows that the injection scheme can effectively improve the oilrecovery rate.The1380test area reservoir of Ganguyi oilfield was developed a field test On the basis ofindoor experiment, combined with the actual situation of the mine,the field test results showthat the whole test area water decreased by16%, the oil increased290.76tons, the effects of increasing oil and decreasing water.is better.It indicates that the gel foam combined profileand flooding technology has very good adaptability in this kind of reservoir, and has a goodpopularizing prospect.