Barite pollution blockage remover composition of oil-gas well of oilfield and preparation method of barite pollution blockage remover composition

Abstract

The invention provides a barite pollution blockage remover composition of an oil-gas well of an oilfield. The composition is prepared from the following raw materials in parts by weight: 20-25 parts of acetone semicarbazon, 16-20 parts of 5-carboxylic acid-3-amino-1,2,4-triazole, 13-16 parts of L-sodium aspartate, 3-5 parts of crown ether (18-crown-6), 7-10 parts of phenyl diethyl malonate, 11-15 parts of dimethylethanolamine, 33-37 parts of ethosuximide, 9-13 parts of iminodiacetic acid, 30-35 parts of ammonia water (40 wt%) and 70-80 parts of water. The blockage remover composition is used for removing blockage of a stratum with barite pollution in drilling mud; the blockage removal speed is high, and the blockage removal of barite pollution in the oil-gas well can be completed within 4-12 h, and therefore, the yield of the oil-gas well of the oilfield is recovered and improved; the descaling rate is 98% or higher, and the blockage removal of barite pollution in the oil-gas well of the oilfield is completed by a one-step method; the safe and non-corrosive blockage removal is achieved; no corrosion, no dead angle, no precipitation or no secondary well clogging are caused; 90% or more of barite mud pollution can be effectively removed.

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 an oil field barite pollution plugging removal agent composition, and the invention also relates to a preparation method of the oil field oil and gas well barite pollution plugging removal agent composition. Background technique [0002] Barite pollution in oil fields and oil and gas wells means that during the drilling process of oil and gas wells, heavy materials need to be added to the drilling fluid according to the high pressure conditions of the drilling formation to increase the density of the drilling fluid to balance the formation pressure and prevent Accidents such as well kick and blowout occurred. Barite is often added to drilling mud to increase the density of drilling mud. The commonly used weighting material is barite powder with a density of 4.2g / cm 3 , with a fineness of about 200 mesh, used to increase the density o...

AI Technical Summary

Problems solved by technology

[0003] Due to the very stable chemical properties of barite, its solubility in water and strong acid and strong alkali solutions is very small, so it is difficult to remove pollutants with conventional acid-base cleaning and deblocking agents

[0004] Currently domestic oil and gas well barite pollution plugging agents are basically composed of oxalic acid, citric acid, aminotrimethylene phosphonic acid, disodium ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid and sodium hydroxide. When plugging, it is highly corrosive and toxic, and the waste liquid is not easy to degrade after unblocking. The reaction time is 12 to 48 hours, and the descaling rate is between 30% and 90%. Alternate acid and alkali steps