Preparation method of multi-branched cationic polyether microbial demulsifier

Abstract

The invention discloses an environment-friendly multi-branched cationic polyether microbial demulsifier synthesized based on a double metal cyanide complex catalyst, bisphenol A is used as a block polyether initiator and reacts with formaldehyde and vinylamine to generate a polyamine compound which takes bisphenol A as a core, vinylamine as a branch and phenolic hydroxyl as a leaf, then ring-opening polymerization is performed on the modified cationic polyether and epoxy compounds including epoxypropane and ethylene oxide to obtain multi-branched polyether, and further the multi-branched polyether reacts with a microbial metabolite and a surfactant to obtain the multi-branched cationic polyether microbial demulsifier. The multi-branched cationic polyether microbial demulsifier prepared by using the double-metal cyanide complex catalyst has no acid-base property problem, has good chemical and biological characteristics and oil and water amphipathy, can effectively reduce the surface tension of water, can be used under the conditions of extreme temperature, pH value and salinity, is non-toxic, environment-friendly and energy-saving, the demulsifier is biodegradable, has higher deoiling rate and demulsification efficiency and better demulsification capability, does not need post-treatment, and overcomes the defects of the traditional demulsifier in function and preparation process; the oil exploitation cost is reduced, and the development of an oil exploitation process is promoted.

Description

technical field [0001] The invention belongs to the technical field of demulsification and dehydration of crude oil, and in particular relates to a preparation method of an environment-friendly multi-branched cationic polyether microbial demulsifier synthesized based on a double metal cyanide complex catalyst. Background technique [0002] With the continuous development and wide application of petroleum industry, especially tertiary oil recovery technology, the composition of crude oil production fluid becomes more and more complex, the water content is higher and higher, and the stability of production fluid is enhanced. Some solids are poorly soluble in water, and when one or several of these solids exist in large amounts in water, an emulsion will be formed. Theoretically speaking, this system is very unstable. When some surfactants (such as soil particles) exist, the emulsified state of the system will be aggravated, and even the two phases will be difficult to separate...

AI Technical Summary

Problems solved by technology

Although the demulsification speed of chemical demulsifier is fast, its use cost is high, it has certain pollution to the environment, and it has strong selectivity. One kind of emulsion is only suitable for one or several kinds of crude oil, and cannot be universally applied Crude oil production fluids of various natures, especially in various oilfields with polymer injection oil recovery and ASP flooding expansion, the production fluid emulsification is more serious, resulting in the difficulty of oil-water separation, which is difficult to solve with pure chemical demulsifiers

Compared with chemical demulsifiers, although biological demulsifiers have a wide range of applications, are easy to degrade, have little environmental pollution, and can be produced by fermentation, their demulsification speed is relatively slow when used, and the use of biological demulsifiers alone is relatively large. Large, resulting in higher cost of use

Due to the unsatisfactory demulsification effect, both of them have the problem of high oil content in drainage

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