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

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

Active Publication Date: 2020-02-04
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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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'-bis(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-necked 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) Substituting N,N'-bis(2-hydroxyethyl / propyl)-urea with 1-bromoalkane to obtain 1,3-dialkyl-1,3-dihydroxyethyl / Propyl urea intermediate, the reaction equatio...

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-dimer oxide with n=14, q=12 Taking vinyl ether urea as an example, the results are as follows figure 2 an...

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

The invention discloses a gemini surfactant for oil displacement, and a preparation method and application thereof. The gemini surfactant is a 1,3-dialkyl-1,3-dipolyoxyethylene ether urea or a 1,3-dialkyl-1,3-dipolyoxypropylene ether urea. The gemini surfactant for oil displacement has good chemical stability and excellent salt resistance in a relatively wide range of pH, has excellent effects ofreducing interfacial tension, and can be compounded with a petroleum sulfonate surfactant, and the crude oil / formation water interface tension is reduced to ultra-low in the case of alkali-free conditions. The gemini surfactant is applied to alkali-free binary (surfactant + polymer) combination flooding, and the recovery factor is improved.

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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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
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