Low-temperature demulsifier for crude oil and preparation method of low-temperature demulsifier

Abstract

The invention discloses a low-temperature demulsifier for crude oil and a preparation method of the low-temperature demulsifier, and belongs to the field of additive chemicals for oilfields. The low-temperature demulsifier for the crude oil is prepared from the following raw materials: 40-60 parts of ethylenediamine, 20-36 parts of methanol, 28-42 parts of 2,2,3,4,4,4-hexafluorobutyl methacrylate,15-23 parts of petroleum sulfonate, 10-25 parts of sodium persulfate, 20-36 parts of sodium dodecyl sulfate, 10-18 parts of sodium dimethyldithiocarbamate and 8-15 parts of 1-dodecanethiol. The invention further discloses the preparation method of the low-temperature demulsifier. The demulsifier has the characteristics of high demulsification speed and high efficiency, and the preparation methodis simple and low in cost.

Description

technical field [0001] The invention relates to the technical field of oilfield chemical additives, in particular to a low-temperature crude oil demulsifier and a preparation method thereof. Background technique [0002] With the development of the world's petroleum industry, the amount of oil extraction is increasing. When crude oil is extracted from the ground, it often carries a large amount of water or brine. Under the action of the interface active substances in crude oil, these water or brine can be combined with crude oil Emulsions with considerable stability are formed. These emulsions bring great difficulties to oil and gas gathering and transportation and crude oil refining. Therefore, dehydration and desalination must be carried out, that is, demulsification. Different methods can be used for demulsification, but the most common is The most effective method is to add chemical reagents for chemical demulsification. The demulsifier molecules penetrate and adhere to ...

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Problems solved by technology

[0002] With the development of the world's petroleum industry, the amount of oil extraction is increasing. When crude oil is extracted from the ground, it often carries a large amount of water or brine. Under the action of the interface active substances in crude oil, these water or brine can be combined with crude oil Emulsions with considerable stability are formed. These emulsions bring great difficulties to oil and gas gathering and transportation and crude oil refining. Therefore, dehydration and desalination must be carried out, that is, demulsification. Different methods can be used for demulsification, but the most common is The most effective method is to add chemical reagents for chemical demulsification. The demulsifier molecules penetrate and adhere to the interface of the emulsified droplets, displace the emulsifier and destroy the surface film, so that the dispersed phase is released and coalesced, phase separation, and finally To achieve the purpose of phase separation, commercially available conventional demulsifiers in the prior art often need to be effective at higher temperatures, and heating during demulsification consumes a lot of energy, and the time required for demulsification is long

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