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Gemini surfactant for oil displacement, binary composite system, preparation method and application thereof

A technology of surfactant and gemini surface is applied in the field of gemini surfactant for oil displacement and its preparation, which can solve the problems of reducing the interfacial tension to ultra-low, and achieve the reduction of interfacial tension, the improvement of oil recovery, and the excellent salt tolerance. Effect

Active Publication Date: 2021-01-12
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, cheap surfactants commonly used in ASP flooding, such as petroleum sulfonates, heavy alkylbenzene sulfonates, natural carboxylates, petroleum carboxylates, and lignin sulfonates, are usually It is difficult to reduce the interfacial tension of crude oil and water to ultra-low, so a new type of surfactant needs to be developed

Method used

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  • Gemini surfactant for oil displacement, binary composite system, preparation method and application thereof
  • Gemini surfactant for oil displacement, binary composite system, preparation method and application thereof
  • Gemini surfactant for oil displacement, binary composite system, preparation method and application thereof

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Embodiment 1

[0043] Embodiment 1, the preparation of gemini surfactant for oil displacement of the present invention

[0044] (1), using commercially available urea (content 98%) and ethylene oxide (propylene oxide can also be used) as raw materials to prepare N,N'-di(2-hydroxyethyl / propyl)-urea, the reaction equation See formula (1) and formula (4), add 61.22g of urea aqueous solution containing 50wt% urea to the three-neck bottle, keep the temperature at 5-10°C, then pass in 88g of ethylene oxide, add 10ml of acetic acid, and then the reaction solution Insulated and stirred at 5-10°C for 120 minutes. After removing water and low boilers under normal pressure, the crude product was separated by column chromatography to obtain 126.68 g of N,N'-bis(2-hydroxyethyl / propyl)- Urea, the reaction yield is 85.6%.

[0045]

[0046] (2) Substitution reaction of N,N'-bis(2-hydroxyethyl / propyl)-urea with 1-bromoalkane to obtain 1,3-dialkyl-1,3-dihydroxyethyl / Propyl urea intermediate, the reactio...

Embodiment 2

[0052] Embodiment two, the influence of gemini surfactant for oil displacement of the present invention on oil-water interfacial tension

[0053] Gemini surfactant for oil displacement of the present invention, i.e. 1,3-di(alkyl)-1,3-dipolyoxyethylene / propylene ether urea as the main surfactant, compounded with petroleum sulfonate surfactant (the molar fraction of the gemini surfactant for oil displacement of the present invention in two kinds of compounded surfactants is ≥0.5, and the total molar fraction is 1), and the mass ratio of the gemini surfactant of the present invention and petroleum sulfonate is 6 : 4, the total concentration of the two surfactants is shown in Table 1 to obtain a binary composite system. Under the conditions of 50°C and 6000r / min, the interfacial tension was measured using a spinning drop interfacial tensiometer, and the 1,3-bis(dodecyl)-1,3-dimeroxy Taking vinyl ether urea as an example, the results are as follows figure 2 and shown in Table 1....

Embodiment 3

[0064] Embodiment three, the physical simulation oil displacement experiment of gemini surfactant of oil displacement of the present invention

[0065]With 1,3-bis(alkyl)-1,3-dipolyoxyethylene / propylene ether urea of ​​the present invention as the main surfactant and petroleum sulfonate surfactant compound to obtain a binary composite system (the present invention The mole fraction of gemini surfactants for oil displacement in the two compounded surfactants is ≥0.5, and the total mole fraction is 1), under the condition of not adding any alkali or basic salt, or adding any neutral inorganic salt , using the natural core of Daqing Oilfield to carry out the physical simulation oil displacement test, the injection method is first to use 0.1PV polymer flooding (HPAM polymer, molecular weight 16-19 million, 1200mg / L) + 0.1PV to be tested system flooding, alternating 3 times , the system to be tested is a binary composite system, containing 0.3wt% surfactant to be tested and 1200mg / ...

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Abstract

Disclosed in the present invention are a gemini surfactant for oil displacement, and a preparation method for and an application of the gemini surfactant. The gemini surfactant is 1,3-dialkyl-1,3-dipolyoxyethylene ether urea or 1,3-dialkyl-1,3-dipolyoxypropylene ether urea. The gemini surfactant for oil displacement provided by the present invention has good chemical stability and excellent salt tolerance in a wide pH range, has good performance in reducing interfacial tension, and can enhance the oil recovery by about 18% when applied in alkali-free binary (surfactant + polymer) combination flooding.

Description

technical field [0001] The invention relates to a surfactant for oil displacement, in particular to a gemini surfactant for oil displacement and its preparation method and application. Background technique [0002] After most oil reservoirs are discovered, part of them can be recovered by using the natural energy of the reservoir itself, and this stage is called primary oil recovery. In order to delay or prevent the pressure drop in the reservoir, fluids such as water are injected into the reservoir within a certain period of time after the primary oil recovery, and a part of the oil is recovered by using the fluid to "maintain the pressure". This oil recovery method is usually called secondary oil recovery. When secondary oil recovery reaches the economic limit, fluids that can cause physical and / or chemical changes or energy changes will be injected into the formation for further oil recovery. This oil recovery method is usually called tertiary oil recovery. Chemical floo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C07C273/18C07C275/10C08G65/26E21B43/22
CPCC07C273/1863C07C275/10C08G65/2618C08G65/2633C09K8/584E21B43/16
Inventor 伍晓林侯兆伟陈劼王海峰杨勇
Owner PETROCHINA CO LTD