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Preparation and applications of surfactant for alcohol amide-sulfate composite type alkali-free oil displacement

A surfactant and sulfate technology, used in the preparation of sulfates, drilling compositions, chemical instruments and methods, etc., can solve the problems of poor salt tolerance of anionic surfactants, and reduce the oil/water interfacial tension. , the effect of excellent salt resistance and excellent oil/water interfacial tension

Inactive Publication Date: 2013-07-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a kind of non-ionic-anionic composite surfactant, on the one hand keeps the advantage of anionic surfactant, on the other hand, overcomes the problem of the poor salt tolerance of anionic surfactant

Method used

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  • Preparation and applications of surfactant for alcohol amide-sulfate composite type alkali-free oil displacement
  • Preparation and applications of surfactant for alcohol amide-sulfate composite type alkali-free oil displacement
  • Preparation and applications of surfactant for alcohol amide-sulfate composite type alkali-free oil displacement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of cocoic acid monoethanolamide polyoxyethylene ether sulfate

[0025] Using commercially available cocoic acid monoethanolamide (CMEA, content 97%) as raw material, ethylene oxide (EO) was added in a 0.5L high-pressure reactor (Weihai Self-Control Reactor Co., Ltd.). The feeding amount of CMEA is 100-150g, the catalyst is KOH, and the dosage is 0.5% of the mass of CMEA. Calculate the amount of EO added based on the total number of ethylene oxide per molecule n=2~5, press EO into with nitrogen, and react at 150~180°C until the pressure (gauge pressure) drops to zero. figure 1 is a product CMEA-EO 2 Infrared spectrum chart.

[0026] Add 10.3g CMEA-EO to a 250mL four-neck flask 2 , chloroform 100ml, start the stirrer and stir until CMEA-EO 2 Dissolve completely, then slowly add chlorosulfonic acid dropwise under stirring, keep chlorosulfonic acid / CMEA-EO 2 The molar ratio is 1.2:1, and the temperature is kept at about 20°C during the dropping process. Th...

Embodiment 2

[0028] Preparation of palmitic acid diglycolamide sulfate

[0029] Add 9.00g of diglycolamine to a 500mL three-neck flask, dissolve it in 70ml of water, add 210mL of tetrahydrofuran (THF) at ice bath temperature (0-5°C), then add 16.12g of magnesium oxide, stir for about 30min, then slowly drop A tetrahydrofuran solution of palmitoyl chloride was added (25.83 g of palmitoyl chloride was dissolved in 70 mL of tetrahydrofuran). Control the dropping time to about 0.5h, and continue stirring for 2-2.5h. After the reaction, the reaction mixture was poured into a Buchner funnel for suction filtration to remove solid magnesium oxide and magnesium chloride, the filtrate was collected, the solvent was removed by rotary evaporation, and vacuum-dried at 50°C to obtain palmitic acid diglycolamide as white powder. figure 2 It is the infrared absorption spectrum of palmitic acid diglycolamide.

[0030] Add 12g of palmitic acid diglycolamide and 100ml of chloroform into a 250mL four-neck ...

Embodiment 3

[0032] Application of Coco Monoethanolamide Ethoxylate Sulfate.

[0033] Cocoic acid monoethanolamide ethoxylate sulfate is compounded with other surfactants such as carboxybetaine amphoteric surfactants, and dissolved in the formation water of Daqing Oilfield (from the fourth oil production plant), wherein cocoic acid monoethanol The mole fraction of amide ethoxylate sulfate is 0.3, the total concentration (mass fraction) of surfactant is 0.05% to 0.4%, 1000mg / L polyacrylamide is dissolved in the formation water, without adding any alkali or alkaline salt , neutral inorganic salts, and co-surfactants, at 45°C (Daqing oil reservoir temperature), the equilibrium interfacial tension of Daqing crude oil (from No. 4 Oil Production Plant) / formation water can be reduced to 10 -3 On the order of mN / m, the result is as follows Figure 5 shown.

[0034] from Figure 5 It can be seen that when the total concentration of surfactants is ≥0.1%, the interfacial tension can be reduced to ...

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Abstract

The invention relates to preparation and applications of a surfactant for alcohol amide-sulfate composite type alkali-free oil displacement, and belongs to the field of colloid and interface chemistry. According to the present invention, fatty acid monoethanol amide is subjected to an ethoxylation reaction and a sulfation reaction to prepare an alcohol amide-sulfate composite type surfactant fatty acid monoethanol amide ethoxylate sodium sulphate; the surfactant has good chemical stability and excellent salt tolerance in a range from a neutral pH value to an alkaline pH value, wherein the hydrophilic-lipophilic balance can be regulated by controlling a chain length of alkyl in the raw material fatty acid and the number of ethylene oxide added to every molecule through an addition reaction; the surfactant has high saturation absorption capacity in a water / air interface and an oil / water interface so as to efficiently reduce crude oil / water interface tension; the surfactant can be matched with other surfactants, such that Daqing crude oil / formation water interface tension can be reduced to a 10<-3> mN / m magnitude under the following conditions, wherein the conditions comprise that the total mass fraction of the surfactant is 0.05-0.5%, any alkalis, alkaline salts, neutral electrolytes and cosurfactants are not added, and an oil pool temperature is 45 DEG C; and the surfactant can be adopted as an alkali-free oil displacement agent.

Description

technical field [0001] The invention relates to the preparation and application of an alcohol amide-sulfate composite non-alkali oil flooding surfactant, which belongs to the technical field of colloid and interface chemistry. Background technique [0002] In 2011, my country's dependence on foreign crude oil has exceeded 55%. On the other hand, the discovery of new oil fields is becoming more and more difficult, so the use of new technologies to further enhance the recovery of old oil fields has become a strategic measure for the stable and high production of crude oil in my country. [0003] Only about 30% to 40% of the underground oil reserves can be recovered in the oil field through the primary recovery (self-injection) and secondary recovery (water flooding), and 60% to 70% of the crude oil remains underground. These residual oils are usually trapped in the pores of porous rocks, and it is difficult to flow out under normal water injection pressure due to capillary ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C07C305/06C07C305/10C07C303/24
Inventor 崔正刚于俊杰胡欣王峰魏慧贤
Owner JIANGNAN UNIV
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