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Highly effective mixed oil expellant applied to tertiary oil recovery and its preparation method

An oil-displacing agent and high-efficiency technology, applied in the field of high-efficiency compound oil-displacing agent and its preparation, can solve the problems of poor compatibility of formation water, unsatisfactory performance of binary compound flooding, unsatisfactory oil-water interfacial tension capacity, etc. Low, good compatibility, reducing the effect of oil-water interfacial tension

Inactive Publication Date: 2006-11-22
中国石化股份胜利油田分公司地质科学研究院
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the single active agents on the market are mainly products such as alkylbenzene sulfonate and sodium lignin sulfonate. The ability to reduce the oil-water interfacial tension is not ideal, and the compatibility with formation water is poor. The active agents currently on the market The performance cannot meet the requirements of binary compound flooding, so a high-efficiency oil-displacing agent with strong oil washing ability, good stability, good compatibility with formation water, and aging resistance is needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0028] raw material:

[0029] Petroleum sulfonate 60kg, nonylphenol polyethylene oxide ether 14kg, sorbitan fatty acid ester 5kg, sodium lauryl sulfate 7kg, isopropanol 3kg, sodium chloride 1kg, water 10kg.

[0030] Preparation steps:

[0031] (1) At normal temperature and pressure, add nonylphenol polyethylene oxide ether, sorbitan fatty acid ester, and sodium dodecylbenzenesulfonate to the reaction kettle, and fully stir for 2 hours;

[0032] (2) 5.5kg (50% of the total water) water is added to the above reaction kettle, after stirring for 1 hour, add the remaining 5.5kg of water, and evenly add pure sodium chloride powder, stir until uniform, and form an auxiliary agent;

[0033] (3) Then add petroleum sulfonate into the reaction kettle, and mix with the above-mentioned additives evenly to obtain the finished oil displacement agent.

preparation Embodiment 2

[0035] raw material:

[0036] Petroleum sulfonate 65kg, sorbitol polyoxyethylene ether 17.5kg, sodium dodecylbenzenesulfonate 6kg, ethanol 2.5kg, sodium chloride 2kg, water 7kg.

[0037] The preparation steps are the same as those of Preparation Example 1.

preparation Embodiment 3

[0039] raw material:

[0040] Petroleum sulfonate 55kg, glycerin fatty acid ester 8kg, nonylphenol polyethylene oxide ether 10kg, sodium stearate 8kg, ethylene glycol 3.5kg, sodium chloride 0.5kg, water 15kg.

[0041] The preparation steps are the same as those of Preparation Example 1.

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Abstract

The invention discloses a third oil extraction high-efficient built oil displacement agent and preparing method in the chemical oil displacement domain, which is characterized by the following: adapting oil sulfonate as main surface activator to build with non-ion surface activator, anion surface activator, organic solvent and natrium chloratum; reducing oil water interface tension without influencing by mineralizing degree; improving the crude oil recovery efficiency by over 20 percent with polymerization.

Description

technical field [0001] The invention relates to the field of chemical flooding for improving oil recovery in oil reservoirs, in particular to a high-efficiency compound oil flooding agent for tertiary oil recovery and a preparation method thereof. Background technique [0002] With the continuous development of oil extraction, oil fields in many regions of the world have entered the stage of high water cut and ultra-high water cut in the later stage of development. In order to improve the recovery rate of mature oilfields and increase recoverable reserves, the following oil displacement methods mainly exist in the prior art: (1) alkaline water flooding, (2) polymer flooding, (3) ASP flooding. Among them, ASP flooding (alkali-polymer-surfactant) is developed on the basis of alkaline water flooding and polymer flooding, and is currently the most widely used oil displacement method. Although the recovery rate of crude oil can be greatly increased, the...

Claims

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Application Information

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IPC IPC(8): C09K8/584
Inventor 孙焕泉李振泉曹绪龙宋新旺李秀兰王红艳张爱美单联涛田志铭李青华
Owner 中国石化股份胜利油田分公司地质科学研究院
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