Acidification technology and application of conventional block in district-8 of Jinglou oilfield

For conventional block in district-8 of Jinglou oilfield,characterized by high waxy crude oil,high colloid asphalt content,high freezing point,strong reservoir heterogeneity,as well as the problems of both organic and inorganic pollution jam,the indoor optimization acid formulation and perfecting construction technology studies have been carried out,and a set of complete acidification technology suitable for this block have been developed.The application results indicate the acidification technology can effectively remove formation of organic and inorganic pollution,preventing acid slag production and avoiding pollution jam formation.In addition,after acidification construction,with the use of 0.6~0.8 g/cm3 nitrogen foam drainage,it can effectively enhance the residual acid flowback and prevent secondary damage to the formation.