Low-temperature environmental protection crude oil demulsifier

Abstract

The invention relates to low-temperature environmental protection crude oil demulsifier which is formed by mixing initiating agent, catalytic agent, epoxy ethane and propylene epoxide. The technical scheme is as follows: under the action of the catalytic agent, the initiating agent triggers the copolymerization of the epoxy ethane and the propylene epoxide so as to obtain linear polyether with active hydroxyl groups on both ends, and finally the obtained polyether reacts with polyisocyanates in aromatic solvent, wherein the initiating agent is glycol or propanediol; the catalytic agent is themixture of alkaline earth compound and alkali metal hydroxide; and the weight ratio of the initiating agent, the catalytic agent, the epoxy ethane and the propylene epoxide is 10:1:150:500. The low-temperature environmental protection crude oil demulsifier of the invention is used for the low-temperature dehydration, the desalination, the visbreaking, the wax resistance, the corrosion resistance,and the like of crude oil, has high adaptability, can be suitable for the fast desalination and the dehydration of thickened oil, thin oil and mixed crude oil of various oil fields, and can also be suitable for the fast desalination and the dehydration of the mixed crude oil of an oil refinery.

Description

Technical field [0001] The invention belongs to chemical reagents for oil fields, and particularly relates to a low-temperature environmentally friendly crude oil demulsifier. Background technique [0002] During the extraction of crude oil, due to the contact between crude oil and water and the natural emulsifier in crude oil, the crude oil and water form a stable emulsion. Especially in the current tertiary oil recovery, the injection of a large amount of chemicals and surfactants has caused serious emulsification of crude oil. In order to meet the requirements of crude oil export, it is necessary to demulsify crude oil to separate crude oil from water. Compared with the demulsifier process in the early stage of crude oil extraction, the demulsification process of the chemical flooding produced fluid is more complicated and more difficult. With the application of chemical flooding in major domestic oilfields, chemical flooding produced more and more fluids. Due to the additio...

AI Technical Summary

Problems solved by technology

Another unfavorable factor is the energy consumption in the demulsification process, which leads to an increase in the cost of production fluid treatment year by year, and a corresponding increase in the treatment cost of crude oil production fluid

The most direct and effective measure to reduce the energy consumption of oil collection and dehydration is to reduce the temperature of oil collection and dehydration. However, one of the technical difficulties is the problem of demulsification in oil-water separation. Problems such as rising oil content in water phase after emulsion

At present, the domestically produced demulsifiers have four shortcomings. First, they have poor adaptability and can only demulsify specific oil and water. Second, the demulsification effect on chemical flooding production fluid is not good, and the dosage is large

Third, the production cost of demulsifiers is very high, which has reached the level of meager profit

Fourth, the low temperature demulsification performance is poor