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Oil displacement agent

An oil-displacing agent and surfactant technology, applied in the field of oil-displacing surfactants, can solve the problems of chromatographic separation, unsatisfactory use effect, and restricting the development of surfactants.

Inactive Publication Date: 2011-08-10
SHANXI HUASHENG ELECTRIC ENG
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Problems solved by technology

[0004] Currently, most of the oil displacement surfactant products used in oil fields are compound mixtures of two or more surfactants. Although the indoor evaluation effect is good, when used in the field, there will be serious "chromatographic separation" phenomenon , the use effect is not ideal, which seriously restricts the development of surfactants as oil displacing agents

Method used

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Embodiment Construction

[0018] Synthesis of N,N'-Dilauroylethylenediamine Sodium Dipropionate.

[0019] 1. Synthetic intermediates

[0020] In the three-necked flask, add an appropriate amount of anhydrous ethylenediamine, heat it in a water bath to about 50°C, and slowly add methyl acrylate dropwise, wherein ethylenediamine:methyl acrylate=1:2 in terms of moles, and continue stirring after the dropwise addition After 3-4 hours of reaction, unreacted substances were distilled off to obtain intermediates.

[0021] 2. Synthetic secondary products

[0022] In the four-necked flask, add a certain amount of intermediate, dissolve it in a certain amount of acetone, use diethylamine to control the system pH=9-10, and add lauroyl chloride and anhydrous triethylamine dropwise under stirring, wherein Intermediate in terms of moles: lauroyl chloride = 1: 2. Continue to react for 6 hours after the dropwise addition. After the reaction, remove the solvent acetone and the generated triethylamine hydrochloride to...

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Abstract

The invention provides an oil displacement agent which is a Gemini type dianionic surfactant N,N'-dilauroyl-ethylenediamine-sodium diacetate of which the molecular structural formula is disclosed in the specification. The oil displacement agent effectively avoids the phenomenon of chromatographic resolution, and has an ideal use effect.

Description

technical field [0001] The invention relates to a surfactant used for oil displacement in the process of oil exploitation in an oil field. Background technique [0002] About 90% of my country's onshore oil fields have entered the middle and late stages of water flooding oil production. The water content of the produced fluid is relatively high, and the cost of oil production continues to increase, but the average recovery rate is only about 30%. A large amount of crude oil is still stranded underground. It is difficult to stabilize production or further increase production by water flooding. [0003] How to further enhance oil recovery under the existing oil recovery technology conditions, various new methods are constantly emerging. Among them, chemical oil displacement agent is one of the methods, and in the method of chemical oil displacement agent, the more promising one is surfactant oil displacement. [0004] Currently, most of the oil displacement surfactant product...

Claims

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Application Information

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IPC IPC(8): C09K8/584
Inventor 胡帅杨建军张珂珂
Owner SHANXI HUASHENG ELECTRIC ENG
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