The invention discloses a blocking remover composition for the barite
pollution of an oil and gas well. The blocking remover composition is characterized by being prepared from the following raw materials in parts by weight: 16 to 20 parts of hydroxyethyl
acetamide, 20 to 25 parts of amino
acetamide, 13 to 16 parts of 3-amino-1,2,4-
triazole, 12 to 16 parts of cinnamamide, 10 to 14 parts of
crown ether (18-crown-6), 6 to 9 parts of
sodium dihydroxytartrate, 17 to 21 parts of ethosuximide, 11 to 15 parts of
ethyl salicylate, 1 to 3 parts of p-hydoxyphenylactic acid, 25 to 35 parts of
ammonia liquor (40wt%), and 90 to 110 parts of water. The blocking remover can be used in a temperature range from a
room temperature to 100 DEG C, and can solve the blocking and barite
pollution of an oil and gas well within 4 to 8 hours. The
dissolution rate of barite is greater than 90%, and the scale removing rate is more than 98%. During the de-blocking process, no
corrosion happens, no dead angle exists, no scale or precipitate is generated, secondary blocking is avoided, the de-blocking speed is quick, the waste liquid does not need to be delivered to the ground, and the de-blocking is safe and
corrosion-free.