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Compound demulsifier and application thereof

A demulsifier, L-4 technology, applied in the field of compound demulsifier, can solve problems such as large differences in the types of operation measures, thickening of the oil-water interface film, and no research, achieving good economic and environmental benefits, and fast dehydration speed. , the effect of eliminating the influence

Active Publication Date: 2021-09-21
YANGTZE UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Triazinylcyclohexylamine compounds have high sulfur capacity, but with H 2 S reaction will generate precipitates, and the produced precipitates will cause the oil-water interface film to thicken and increase in strength, which will affect dehydration
However, due to the large differences in the reservoir characteristics, produced fluid properties, wellbore maintenance, and operation measures of various oilfields, no research has been conducted in the early stage that can resist a certain amount of single / mixed wellbore maintenance agents and a certain amount of single / mixed well operation flowback at the same time. Residual fluid, demulsifier to resist the interference of a certain amount of single / mixed wellbore maintenance agent and flowback residual fluid on the dehydration of produced fluid

Method used

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  • Compound demulsifier and application thereof
  • Compound demulsifier and application thereof
  • Compound demulsifier and application thereof

Examples

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Effect test

Embodiment 1

[0038] A compound demulsifier, the demulsifier is formulated with demulsifier X-75 and demulsifier L-4 at a mass ratio of 1:1; wherein demulsifier X-75 is a five-membered copolymerized polyether demulsifier, esterified The mass ratio of post-demulsifier, methyl methacrylate, styrene, methacrylic acid and acrylic acid is 7:0.5:1.5:0.5:0.5. Demulsifier L-4 is a demulsifier modified by block polyether of phenolic aldehyde resin. Demulsifier L-4 is based on phenolic amine resin polyoxyethylene polyoxypropylene ether block polyether as the skeleton, at 80 ° C, add 10% of phenolic aldehyde resin polyoxypropylene polyoxyethylene block polyether dropwise Epichlorohydrin was added and reacted for 10 hours to obtain modified ultra-high molecular weight demulsifier L-4 (molecular weight: 2.6 million).

[0039] The specific preparation method of the compound demulsifier is: take the synthetic demulsifier dry agent X-75 and L-4 of the same quality respectively, and dissolve them in equal ...

Embodiment 2

[0041] A compound demulsifier, the demulsifier is formulated with demulsifier X-75 and demulsifier L-4 in a mass ratio of 2:1; among them, demulsifier X-75 after esterification, demulsifier, methacrylic acid The mass ratio of methyl ester, styrene, methacrylic acid and acrylic acid is 6:1:2:0.5:0.5. Demulsifier L-4 uses phenalkamine resin polyoxyethylene polyoxypropylene ether block polyether as the skeleton, and at 70°C, add 8% ring After the addition of oxychloropropane, react for 12 hours to obtain modified ultra-high molecular weight demulsifier L-4 (molecular weight: 2,000,000).

[0042] The specific preparation method of the compound demulsifier is: respectively take the synthetic demulsifier dry agent X-75 and L-4 according to the mass ratio of 2:1, and at normal temperature, after dissolving with methanol and xylene of equal volume respectively, then press 1: 1 (V / V) mix evenly.

Embodiment 3

[0044] A compound demulsifier, the demulsifier is formulated with demulsifier X-75 and demulsifier L-4 at a mass ratio of 3:1; wherein demulsifier X-75 is a five-membered copolymerized polyether demulsifier, esterified The mass ratio of demulsifier, methyl methacrylate, styrene, methacrylic acid and acrylic acid is 6:1:1.5:1:0.5; demulsifier L-4 is a demulsifier modified by phenolic aldehyde resin block polyether Emulsion, with phenalkamine resin polyoxyethylene polyoxypropylene ether block polyether as the skeleton, add 9% epichlorohydrin dropwise to phenolic aldehyde resin polyoxypropylene polyoxyethylene block polyether at 60°C , After adding, react for 10h to obtain modified ultra-high molecular weight demulsifier L-4 (molecular weight: 1.6 million).

[0045] The specific preparation method of the compound demulsifier is as follows: respectively take the synthesized demulsifier dry agent X-75 and L-4 according to the mass ratio of 3:1, and dissolve them with equal volumes ...

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Abstract

The invention provides a compound demulsifier and an application thereof. The demulsifier is prepared from a demulsifier X-75 and a demulsifier L-4 according to the mass ratio of (1-3):(1-3). The demulsifier X-75 is a quinary copolymerized polyether demulsifier, and mainly solves the problem of dehydration amount; and the demulsifier L-4 is a phenol-amine-aldehyde resin block polyether modified demulsifier, and mainly solves the problems of dehydration and wall hanging. The compound demulsifier provided by the invention is small in dosage, low in dehydration temperature, high in dehydration rate, clear in dehydrated water color, fast in oil-water separation in the demulsification process, and neat in oil-water interface, and can quickly and efficiently solve the problem that normal dehydration of crude oil is interfered by a certain amount of single / mixed oil well shaft maintenance agent and a certain amount of single / mixed flowback raffinate in well operation at low temperature; and secondary pollution to crude oil is avoided, and new impurities are not introduced. Similar problems in most oil field production can be solved or partially solved.

Description

technical field [0001] The invention relates to the fields of oilfield applied chemistry and environmental protection, and specifically relates to a compound demulsifier and its application. Background technique [0002] Water content in crude oil is a common phenomenon in the process of oil and gas field development. At present, electrochemical and thermochemical methods are mainly used in oilfield crude oil dehydration process. Generally speaking, chemical methods are used to treat high-water-containing crude oil emulsions that are easy to dehydrate, and electrochemical methods are used to treat low-water-containing emulsions that are difficult to dehydrate. The most common process is chemical demulsification first, and then electro-demulsification supplemented by chemical demulsification. [0003] However, as my country's oilfield development enters the middle and later stages, in order to ensure the normal production and stable production increase of oilfields, all maj...

Claims

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Application Information

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IPC IPC(8): C10G33/04
CPCC10G33/04
Inventor 陈武黄茗童志明江南李淑芳尹先清李亚兵张蕾石秀慧
Owner YANGTZE UNIVERSITY
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