Application of a Solid Acid Rod in Acidizing Pressurization of Water Injection Wells
Aiming at the problems of scaling,high water injection pressure and increasing oilfield development cost in the late stage of water injection wells in low permeability oilfields,a kind of solid acid product with slow release of active substances was developed,and its performance was characterized through the solubility experiment,plugging removal experiment,N80 steel corrosion experiment,indoor static evaluation experiment and indoor dynamic evaluation experiment.The results showed that the solid acid had good dissolution effect on inorganic scale,little corrosion to pipe string,long action distance and long time,and no residue.In the field application,the solid acid was continuously added to dissolve inorganic impurities,increase the circulation channel of the formation and reduce the water injection pressure,and good plugging removal and injection increase effects were achieved.
Acidizing plug removalSolid acidDepressurizing and increasing injection
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