Offshore oilfield low-temperature demulsifier and preparation method thereof

Abstract

The invention provides an offshore oilfield low-temperature demulsifier and a preparation method thereof, and relates to the technical field of petroleum industry. The low-temperature demulsifier for the offshore oilfield comprises, by weight, 10-15 parts of fatty alcohol, 5-10 parts of a basic catalyst, 1-3 parts of a dehydrating agent, 3-5 parts of an oil-water separating agent, 3-5 parts of a composite flocculant, 1-3 parts of an aluminum sulfate inorganic flocculant, 2-5 parts of an adsorbent, 1-3 parts of potassium hydroxide and 0.5-2 parts of polypropylene glycol. The dehydrant and the oil-water separating agent are matched for use, water and oil in crude oil can be layered, the demulsification rate of the demulsifier is increased, the aluminum sulfate inorganic flocculant and the composite flocculant are matched for use, bacteria and impurities in the water in the crude oil can be adsorbed and precipitated, the adsorbent and the water in the crude oil are dissolved in the demulsification process, and the viscosity and the density of water are increased, so that the water is precipitated, the separation and demulsification effects are better, demulsification, adsorption and flocculation are integrated, and the functions are more diversified.

Description

technical field [0001] The invention relates to the technical field of crude oil treatment chemicals, in particular to a low-temperature demulsifier for offshore oil fields and a preparation method thereof. Background technique [0002] The demulsifier is a kind of surfactant that can destroy the emulsion. The demulsifier mainly destroys the emulsion by partially replacing the stable film. It is used as a dehydrating agent and can remove the water in crude oil and heavy oil to make the water content meet the requirements. ;Used in oil wells, it can reduce the viscosity of crude oil and prevent oil wells from being blocked. It is obtained by polymerization of fatty alcohol, propylene oxide, and ethylene oxide. It is easily soluble in water and is a light yellow or milky white viscous liquid. Crude oil contains colloid, Asphaltene and other natural emulsifiers have strong emulsifying ability, coupled with the wide use of various oilfield additives, chemical flooding, steam flo...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a low-temperature demulsifier for offshore oilfields and its preparation method, which solves the problems of low demulsification efficiency and single functional effect of the existing demulsifiers