Blocking remover composition for barite pollution of oil and gas well and preparation method thereof

Abstract

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.

Description

technical field [0001] The patent of the present invention relates to an auxiliary agent used in oil recovery in oil fields, in particular to a block-removing agent composition for barite contamination of oil and gas wells, and also relates to a preparation method of the block-removing agent composition for barite pollution of oil and gas wells. Background technique [0002] In the process of oil and natural gas exploration and development, any well that encounters high-pressure oil, gas, and water layers should use a heavier drilling agent that is higher than the density of the drilling fluid in the wellbore, and the amount should be close to the amount of drilling fluid in the wellbore. The weighting agent for density is barite powder. Barite powder is a commonly used mud weighting material. The main chemical composition of barite powder is barium sulfate (BaSO 4 ). Pure barite powder is white powder with a fineness of about 200 mesh and a density of 4.2g / cm 3 , used to...

AI Technical Summary

Problems solved by technology

The barite powder used to increase the specific gravity of the drilling mud is insoluble in the drilling mud, and is prone to layered settlement during the drilling of oil and gas wells. After the barite precipitates, it will block the natural fractures and capillary pores in the formation. , the formation polluted by it will lead to poor oil and gas channels after the new well is put into production, affecting oil or gas recovery; if the barite pollution is serious, it will also cause oil and gas wells to have no oil and gas production

[0003] Due to the very stable chemical properties of barite, its solubility in water and strong acid and strong alkali solutions is very small, and it cannot be dissolved and removed by conventional strong acid and strong alkali chemical cleaning.