FIELD: oil industry.
SUBSTANCE: the method for formation acid treatment includes detecting zones of various openness in the treated formation, injecting a portion of hydrochloric acid solution into the higher openness zone, subsequent squeezing of viscous fluid based on oil by the hydrochloric acid solution with a surface-active agent, squeezing of the hydrochloric acid with the surface-active agent into the lesser openness zone in cyclic mode, extraction of used hydrochloric acid from the well at the final cycle, furthermore, the concentration of hydrochloric acid is reduced with every cycle of its application.
EFFECT: increased method efficiency caused by improving durability of insulating screen while reducing its production cost, expanding formations treated by the method along the formation depth and width, simplified treatment process.
17 cl, 2 tbl, 1 ex, 1 dwg
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