Application of multi-component composite technology for plugging relief and increasing water injection in Ansai oilfield

In order to solve the problems of low permeability reservoir blocked reasons in Ansai oilfield, the multi-component composite plugging relief and injection gain technology is proposed in this paper, through laboratory experiments simulating the adaptability of this technology in Ansai low permeability oilfield. Acid treatment of plugging solution has a significant effect to improve the low permeability reservoir core and oxidants play a lower corrosion rate and the protection of steel. The tests in Ansai oilfield show that fluid and oil production increased rapidly but water smooth in oil wells ,the effect of increasing oil is obvious; water injection can achieve injection allocation requirements at the same time, the injection pressure significantly decreased, long period of validity, the effect on decreasing injection pressure and improved injection capacity are satisfactory.