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Preparation method of complex oilfield demulsifier

A demulsifier and oil field technology, applied in the direction of chemical dehydration/demulsification, etc., to achieve ideal dehydration effect and good broad-spectrum effect

Active Publication Date: 2012-12-05
JURONG NINGWU CHEM
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AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems existing in the existing single polyether demulsifier, the purpose of the present invention is to provide a preparation method of compound oilfield demulsifier, which obtains a compound polyether with relative molecular weight distribution in different ranges. Type demulsifier, various polyethers with different molecular weights have special demulsification and dehydration effects for different substances in crude oil, with ideal dehydration effect and good broad spectrum

Method used

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Examples

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example 1

[0028] A preparation method of compound type oilfield demulsifier, specifically comprising the following steps:

[0029] 1) Preparation of polyether demulsifier A with a molecular weight of 200-400:

[0030] Add 200 parts of polyethylene polyamine and 4 parts of KOH into the reactor, heat up the temperature, control the temperature of 120-140°C and feed 80 parts of propylene oxide, keep the pressure below 0.3MPa, and let it fully react, and then feed the oxidation 70 parts of ethylene, the pressure is maintained below 0.3MPa, and it is fully reacted, and the polyethylene polyamine polyether type demulsifier A is finally produced.

[0031] 2) Preparation of polyether demulsifier B with a molecular weight of 700-900:

[0032] Add 200 parts of polyethylene polyamine and 4 parts of KOH into the reactor, heat up the temperature, control the temperature of 120-140°C and feed 450 parts of propylene oxide, keep the pressure below 0.3MPa, and let it fully react, and then feed th...

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Abstract

The invention discloses a preparation method of a high-performance complex oilfield demulsifier, which comprises the following steps of: firstly preparing polyether demulsifiers of different molecular weights, i.e., a polyether demulsifier A of molecular weight 300-500, a polyether demulsifier B of molecular weight 700-900, a polyether demulsifier C of molecular weight 1500-2000, a polyether demulsifier D of molecular weight 4000-5000 and a polyether demulsifier E of molecular weight 8000-10000; and the polyether demulsifiers of various different molecular weights are compounded in certain proportion to obtain the high-performance demulsifier. The high-performance demulsifier prepared by the invention can be suitable for demulsification and dehydration of crude oil from an oilfield, and has the advantages of good broad spectrum and less consumption.

Description

technical field [0001] The invention relates to a demulsifier for oilfield crude oil dehydration treatment and a preparation method thereof, in particular to a preparation method of a composite oilfield demulsifier. Background technique [0002] Water is often mixed in the oil extraction process, and the crude oil must be dehydrated before transportation to reduce transportation costs. The free water in crude oil is easy to separate and remove, while the removal of emulsified water in crude oil generally requires the addition of demulsifiers. At present, polyether demulsifiers are mainly used in China. The hydrogen compound is used as an initiator, and under the action of an alkali metal catalyst, it undergoes anionic ring-opening polymerization reaction with an oxyalkylene to prepare a polyoxyethylene polyoxypropylene ether demulsifier. The molecular weight of a single polyether demulsifier prepared by this process is within a certain narrow range, the dehydration effect o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L71/00C08L71/02C08K5/06C08G65/331C08G65/26C10G33/04
Inventor 翟洪金应军郑磊
Owner JURONG NINGWU CHEM
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