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Surfactant system with high foam performance and ultralow oil/water interfacial tension and application thereof

A surfactant and water interface technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of foam not resistant to oil and low interfacial tension

Pending Publication Date: 2022-03-18
JIANGSU WAN QI BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, it has been found in practice that conventional commercial surfactants, such as sodium dodecyl sulfate (SDS), sodium linear alkylbenzene sulfonate (LAS), α-olefin sulfonate (AOS), alkyl sulfonate Low molecular weight anionic surfactants such as acid salt, alkyl carboxylate (soap) and fatty alcohol polyoxyethylene ether sulfate (AES) are excellent foaming agents, but they are generally difficult to reduce the crude oil / water interfacial tension to Ultra-low, and its stable foam is usually not resistant to oil, and it will defoam when it encounters crude oil

Method used

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  • Surfactant system with high foam performance and ultralow oil/water interfacial tension and application thereof
  • Surfactant system with high foam performance and ultralow oil/water interfacial tension and application thereof
  • Surfactant system with high foam performance and ultralow oil/water interfacial tension and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 constructs surfactant system

[0041] According to the mole fraction ratio of SDS / DTAB is 0.6 / 0.4, weigh the required amount of two surfactants to prepare a binary mixture, then mix this binary mixture with nonionic surfactant APG to form a ternary mixture (the mole fraction of APG in the ternary mixture α n 0.1 to 0.7). That is, the mole fraction ratio of SDS / DTAB / APG in the ternary mixture is (0.6×(0.3-0.9)):(0.4×(0.3-0.9)):(0.1-0.7).

Embodiment 2

[0042] The performance measurement of embodiment 2 different surfactant systems

[0043] Dissolve the mixture in Daqing formation water to make a solution, or make each component into an aqueous solution and then mix them in proportion (the mixing order has no effect), the total concentration is set at 5mM, and the interface between the solution and Daqing crude oil is measured at 45°C tension and foaming properties, results such as image 3 and shown in Table 1. image 3 (a) shows that when the molar fraction of APG is 0.1-0.7, ultra-low interfacial tension can be obtained.

[0044] Take 2.5mL of the solution, put it in a 15mL glass bottle, shake it by hand at 45°C, shake it up and down 20 times, and record the initial foam volume (V i ), and take photos of the foam appearance after 5 minutes, the result is as follows image 3 (a) and (b), shown in Table 1.

[0045] It can be seen that with α n increase, V i increase, at α n = 0.4 to reach the maximum (12mL), and then ...

Embodiment 3

[0048] The performance measurement of the surfactant system of embodiment 3 different concentrations

[0049] The surfactant system consists of the following components: 0.36 mole fraction of anionic surfactant SDS, 0.24 mole fraction of cationic surfactant DTAB, and 0.4 mole fraction of nonionic surfactant APG.

[0050] The fixed composition is SDS / DTAB / APG=0.36 / 0.24 / 0.4, and the total concentration (C t ), measure the interfacial tension and the initial foaming volume (2.5mL solution is placed in the glass bottle of 15mL to foam by hand) respectively with Daqing crude oil, the result is as follows Figure 4 (a) and (b) shown. It can be seen that in the range of 2-7mM total concentration, the interfacial tension of crude oil / formation water can be reduced to ultra-low, while the initial bubble volume increases with the increase of total concentration, and tends to a plateau after the total concentration reaches 7mM (V i >12mL).

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Abstract

The invention discloses a surfactant system with high foam performance and ultralow oil / water interfacial tension and application thereof, and belongs to the field of colloid and interface chemistry. The surfactant system is formed by compounding common anionic, cationic and nonionic surfactants, is dissolved in Daqing formation water, can reduce the interfacial tension of crude oil / formation water to be ultralow (10 <-5 > mN / m order of magnitude) within the concentration range of 2mM to 6mM, and is excellent in foaming performance, the generated foam has good oil resistance, and the oil resistance is good. The foam comprehensive index is increased along with the increase of the total concentration of the surfactant, and the maximum foam comprehensive index can reach 1,340 Ls. The surfactant system is suitable for foam flooding, the viscosity of a surfactant solution can be greatly improved due to the existence of stable foam, so that the plugging efficiency and the swept volume of a displacing fluid are improved, and the saturation of residual oil can be further reduced due to ultralow oil / water interfacial tension.

Description

technical field [0001] The invention specifically relates to a surfactant system with high foam performance and ultra-low oil / water interfacial tension and its application, belonging to the technical field of colloid and interface chemistry. Background technique [0002] For modern society, petroleum is not only an indispensable energy source, but also an important source of chemical industry, but it is non-renewable. Regarding the exploitation of oil, usually primary oil recovery (self-injection) and secondary oil recovery (water flooding) can only produce 30% to 40% of the original reserves, while the remaining reserves are as high as 60% to 70%. They are called residual oil, usually Residing in porous media, it is difficult to recover under conventional water injection pressure. Obviously, it is of great significance to recover this part of residual oil by adopting new technology. [0003] In recent years, the enhanced oil recovery (EOR) technology has received extensiv...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/60
CPCC09K8/584C09K8/602Y02A20/204
Inventor 金瑞刘建文崔正刚
Owner JIANGSU WAN QI BIOLOGICAL TECH
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