Oilfield barium/stronium scale cleaning blockage remover composition and preparation method thereof

Abstract

The invention provides an oilfield barium/stronium scale cleaning blockage remover composition which is prepared from the following raw materials in parts by weight: 20-25 parts of amino acetamide, 33-37 parts of 3-amino-1,2,4-triazole, 10-14 parts of crown ether (18-crown-6), 13-16 parts of sodium dihydroxytartrate, 6-9 parts of ethosuximide, 9-11 parts of N-hydroxyethylamino-diacetic acid, 1-3 parts of ethyl undeeylenate, 11-15 parts of hydroxypropyl ethyl ether, 30-35 parts of ammonia water, and 70-80 parts of water. The composition is used for removing blockage of a rod pumped well, a screw pump well and a stratum; scales of barium sulfate, strontium sulfate, barium carbonate, strontium carbonate and calcium sulfate and the like generated in a water injection system can be quickly dissolved. Blockage removal of a mechanical recovery well and the stratum can be completed within 4-8 h usually, the descaling rate is 98% or higher, descaling and blockage removal of barium/stronium scales of the mechanical recovery well and the stratum can be completed by a one-step method, and waste liquor after cleaning is degraded easily and does not flow back to the ground for treatment, therefore, non-corrosive and safe blockage removal is achieved.

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 oilfield barium-strontium scale cleaning and plugging-removing agent composition, and the invention also relates to a preparation method of the oilfield barium-strontium scale cleaning and plugging-removing agent composition. Background technique [0002] Oilfield barium strontium scale damage is one of the common problems faced by oilfield water flooding development. Aiming at the practical problem of removing barium strontium scale in oilfield water flooding development and oil recovery, our company conducts on-site investigation on the current situation of barium strontium scale scaling in domestic oilfields. A large number of relevant domestic and foreign documents were collected, and technical data on scaling prevention and control in water injection development of Daqing Oilfield, Changqing Oilfield, Shengli Oilfield and Qingha...

AI Technical Summary

Problems solved by technology

The consequences are: scale deposits block the oil layer; after scale deposits, in the production well tubing and gathering pipelines, it is easy to cause pipeline blockage and oil production pumps to fail to work normally

[0004] During the process of water injection in the oil field, it was found that the most prominent problem was the severe barium and strontium scales in the production wells and formations, which led to the deterioration of the wellbore operating environment, frequent rod lagging, rod breakage, pump jamming, etc. The pump inspection cycle is shortened, and the shortest pump inspection cycle is less than three months, which seriously affects the normal production of mechanical recovery wells

[0005] At present, the domestic oilfield barium strontium scale cleaning agent is basically composed of oxalic acid, citric acid, aminotrimethylene phosphonic acid, disodium ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid and sodium hydroxide. Large amount, highly corrosive, toxic, the waste liquid is not easy to degrade after cleaning, the reaction time is 12 to 48 hours, the descaling rate is between 30% and 90%, and most of the cleaning and descaling are two-step acid-base alternation conduct