METHOD FOR NEUTRALIZATION OF HYDROCHLORIC ACID RESIDUES AFTER TREATMENT OF BOTTOMHOLE FORMATION ZONE Russian patent published in 2020 - IPC E21B43/27 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of neutralizing residues of hydrochloric acid after treatment of a bottomhole formation zone. Method for neutralization of hydrochloric acid residues after treatment of a bottomhole formation zone involves pumping of alkali into the well for acid neutralization. Alkali used is encapsulated sodium hydroxide. Prior to pumping of encapsulated sodium hydroxide into well at well head, following is assembled from the bottom up: container for reagent, tubing string, check valve, full-flow pipe circulation valve with shear pins, tubing, packer, tubing, circulating full-circulation valve, tubing, pump cylinder or armature of plug-in pump, pump-compressor pipe, filled container for reagent with encapsulated sodium hydroxide. Assembled assembly is lowered into well so that packer is located above perforation interval. Downhole products are filtered from the well bore. Samples are taken daily for hydrogen index in complex with selected volume of liquid.

EFFECT: technical result is higher efficiency of acid neutralization after treatment of bottomhole formation zone.

1 cl