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Compound oil displacement agent containing double-long-chain-alkyl sulphobetaine and application thereof

A long-chain alkyl sulfobeet and long-chain alkyl technology, which is applied in the field of oil displacement in oil extraction, can solve the problem of not being able to effectively reduce the interfacial tension of Daqing oilfield/formation water

Inactive Publication Date: 2014-08-06
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although CN103113869A discloses a kind of oil displacement agent prepared by mixing double-chain alkyl hydroxypropyl sulfobetaine with water, which can reduce the interfacial tension of Dagang Oilfield / formation water, it can only be obtained by preparing the above-mentioned surfactant and water. However, the oil-displacing agent of the present invention can not effectively reduce the interfacial tension of Daqing Oilfield / formation water, and the compound oil-displacing agent of the present invention has solved this technical problem well

Method used

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  • Compound oil displacement agent containing double-long-chain-alkyl sulphobetaine and application thereof
  • Compound oil displacement agent containing double-long-chain-alkyl sulphobetaine and application thereof
  • Compound oil displacement agent containing double-long-chain-alkyl sulphobetaine and application thereof

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Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1 didodecylmethyl hydroxypropyl sultaine (diC 12 HSB) preparation

[0049] Use didodecanylmethyl tertiary amine (A) as raw material (Solvay Fine Chemical Co., Ltd.), react with 3-chloro-2-hydroxypropanesulfonate sodium (B) (Solvay Fine Chemical Co., Ltd.) , the molar ratio is A:B=1:1.1, and the reaction medium is a mixed solvent of isopropanol / water (volume ratio=6:1). A certain amount of sodium carbonate (B:Na 2 CO 3 =1:0.05) and 1.5% (based on tertiary amine) KI as catalyst. In a 500mL three-neck flask equipped with a stirring bar, a thermometer and a condenser tube, add 23.58g of sodium 3-chloro-2-hydroxypropanesulfonate, add 140mL of water / isopropanol mixed solution, and stir until completely dissolved. Then add 0.1mol (36.7g) diC 12 A and the required amount of sodium carbonate and potassium iodide. Heat up to 85°C, reflux for 48 hours, diC 12 A conversion rate can reach 90.2%. After the reaction was finished, the solvent was removed by rotary ev...

Embodiment 2

[0053] Embodiment 2 didodecyl methyl propyl sultaine (diC 12 SB) Preparation

[0054] Using didodecylmethyl tertiary amine (A) as raw material (Solvay Fine Chemicals Co., Ltd.), react with 1,3-propanesultone (D) (Jiangsu Mengde Electroplating Chemicals Co., Ltd.), mol The ratio is A:D=1:1.2, and the reaction medium is 1,2-dichloroethane. Add 0.1 mol of tertiary amine and 40 mL of 1,2-dichloroethane into a 250 mL three-necked flask equipped with a stirring bar, a thermometer and a condenser, start stirring, and raise the temperature to 50°C. A solution of 0.12 mol of 1,3-propanesultone dissolved in 40 mL of 1,2-dichloroethane was added dropwise into the reaction flask within half an hour. Heating the reactant to the reflux temperature of 80°C, reacting for 12 hours, adjusting the pH of the reaction mixture to weak alkaline with sodium hydroxide solution, diC 12 The conversion rate of A can reach 93%. After cooling, filter with suction, collect the product, add acetone and h...

Embodiment 3

[0058] The surface activity of embodiment 3 products

[0059] wxya 12 HSB and diC 12 SB has poor water solubility, but can be dissolved in toluene. At 25°C, by measuring the toluene / water interfacial tension ( Figure 5 ), get diC 12 The critical micelle concentration (cmc) of HSB is 1.8×10 -5 mol / L, saturated adsorption capacity Г ∞ 7.5×10 -10 mol / cm 2 , the corresponding molecular area is 0.22nm 2 / molecular. Similarly, to get diC 12 The cmc of SB is 4.5×10 -6 mol / L, saturated adsorption capacity Г ∞ 1.0×10 -9 mol / cm 2 , the corresponding molecular area is 0.17nm 2 / molecular. It can be seen that due to the lack of a hydroxyl group, diC 12 Hydrophilicity of SB compared to diC 12 The HSB is even lower, so the surfactant is higher.

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Abstract

The invention discloses a compound oil displacement agent containing double-long-chain-alkyl sulphobetaine and an application thereof, which belong to the technical field of oil displacement in oil exploitation. The double-long-chain-alkyl sulphobetaine in the compound oil displacement agent disclosed by the invention is an ampholytic surfactant which is prepared by reacting double-long-chain-alkyl methyltertiary amine with 3-chloro-2-hydroxypropyl sodium sulfonate or 1,3-phenylacetophenone, and the carbon atom number of each long-chain alkyl is 8-18. The surfactant has good oil solubility, is insoluble in water, and incapable of reducing the interfacial tension of Daqing crude oil / formation water to an order of magnitude of 10<-3>mN / m when used alone. The surfactant is compounded with a specific hydrophilic surfactant serving as solubilizer, wherein the molar fraction of the double-long-chain-alkyl sulphobetaine is 0.1-0.7, the addition of polyacrylamide in a water phase is 1000 mg / L, no alkali or inorganic electrolyte is added, and the interfacial tension of Daqing crude oil / formation water can be reduced to the order of magnitude of 10<-3> mN / m under a condition of total surfactant concentration of 0.25-12.5 mM (the mass fraction is about 0.015-0.75%).

Description

technical field [0001] The invention relates to the application of a double-long-chain alkyl sultaine surfactant in tertiary oil recovery, and belongs to the technical field of oil displacement in oil recovery. Background technique [0002] In recent years, my country's crude oil consumption has increased sharply. In 2013, the dependence on foreign crude oil was close to 60%. But on the other hand, my country's major oil fields still have huge crude oil reserves, but it is difficult to recover them by conventional methods. [0003] Conventional oil recovery methods are so-called primary recovery (self-spraying) and secondary recovery (water flooding), and the total of the two can only recover no more than 40% of underground reserves. The remaining residual oil is trapped in the pores of porous rocks in the form of oil droplets, and due to capillary action, it is difficult to flow out under normal water injection pressure. Although adding polymers to water can improve oil r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/58
CPCC09K8/584
Inventor 崔正刚税向强李炜宋冰蕾
Owner JIANGNAN UNIV
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