| abstract |
The invention discloses an acidifying liquid capable of sand stabilization and plug removal and a preparation method thereof, which belongs to the technical field of oil exploitation. The acidifying liquid comprises, by weight, 6 to 15% of hydrochloric acid, 3 to 10% of fluorboric acid, 0.5 to 5% of hydrofluoric acid, 0.5 to 5% of an anti-swelling agent, 0.5 to 5% of an IS-130 corrosion inhibitor, 0.5 to 5% of an SCA iron ion stabilizing agent, 0.5 to 5% of an XT-05 cleanup additive, 0.5 to 5% of glycol monobutyl ether and 5 to 15% of an XT-23 sand control stabilizing agent, with the balance being water. The acidifying liquid is mainly used for strata with loose sandstone reservoirs, can remove inorganic obstruction of strata, forms a bonding covering on points and surfaces where silty-fine sandstone contacts with clay particles, strengthens skeleton gravels, inhibits migration of particles and reduces damage to reservoirs caused by formation sand production and particle migration obstruction due to loosening of a rock skeleton during various operations of an oil-water well; thus, the effective period of each measure is prolonged, construction procedures are simplified, operation cost is reduced, and the comprehensive effects of exploitation of oil reservoirs in loose sandstone are improved. |