A kind of adsorption inhibitor of carboxybetaine surfactant

A carboxybetaine and surfactant technology, applied in the field of colloid and interface chemistry, can solve the problems of high adsorption rock surface and other problems, and achieve the effect of inhibiting adsorption, excellent adsorption inhibitor, and good adsorption

Active Publication Date: 2018-04-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, if carboxybetaine surfactants are to be used to reduce the interfacial tension of crude oil / formation water, it is necessary to solve the problem of high adsorption capacity on the rock surface and the rock surface becoming oil-wet.

Method used

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  • A kind of adsorption inhibitor of carboxybetaine surfactant
  • A kind of adsorption inhibitor of carboxybetaine surfactant
  • A kind of adsorption inhibitor of carboxybetaine surfactant

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1, tetrameric quaternary ammonium salt inhibits C 16 Adsorption of B at the nanosilica / water interface. A compound in the oligomeric quaternary ammonium salt was used for testing, the compound n=3, m=2, that is, the total number of nitrogen atoms was 4, abbreviated as tetra-N(3)-Br. Will C 16 B (product of Solvay (Zhangjiagang) Fine Chemicals Co., Ltd.) was purified to obtain a white powdery product with a purity>98%. The surface tension of its aqueous solution was measured at 25°C as a function of concentration to obtain a surface tension-concentration curve. Then at different concentrations of C 16 Add 0.5% nano-silica particles (HL-200, Wuxi Jinding Longhua Co., Ltd., Wuxi Jinding Longhua Company, purity>99.8%, BET area: 200±20m 2 / g), ultrasonically disperse, mix and shake at 25°C for 24 hours to reach adsorption equilibrium, and measure the surface tension of the dispersion. Since the surfactant is adsorbed by the particles, the equilibrium concentra...

Embodiment 2

[0022] Example 2, tetra-N(3)-Br inhibits C 16 B Saturated adsorption at Daqing oil sands / water interface. Use a 50mL volumetric flask to prepare a series of different concentrations of C 16 B aqueous solution, wherein the water is deionized water. Take a 25mL sample bottle, add 1g (accurate to 0.001g) of Daqing oil sand, and then add 20mL of LC 16B aqueous solution (solid / liquid weight ratio = 1 / 20), ultrasonically disperse the particles, then fix the sample bottle on a vertical mixer, and roll and shake at 60 rpm in a constant temperature incubator at 45°C for 24 hours to achieve adsorption balance. Take off the sample bottle and put it in a constant temperature box at 45°C for more than 4 hours to allow the oil sand to fully settle. Take the supernatant and centrifuge to remove the residual particles, and measure the C in the supernatant by high pressure liquid chromatography. 16 The equilibrium concentration of B was calculated to obtain its adsorption amount. Will C ...

Embodiment 3

[0023] Example 3, C 16 B and diC 12 B forms a hydrophobic adsorption film on the negatively charged glass slide surface. Cut the glass slide into small pieces with a width of about 15mm, soak them in 30% NaOH aqueous solution for 24 hours, take them out, wash them with pure water until the surface is neutral, and put them into 30mm (L) with tweezers after the surface is dry. × 20mm (D) × 15mm (H) in a square glass box without a cover, supported by glass legs at both ends. Add C to the glass box 16 B or diC 12 Aqueous solution B was soaked at 25°C for 24 hours to achieve adsorption equilibrium, and then a U-shaped needle (0.25mm inner diameter) was used to release a n-decane oil droplet with a volume of 1 μL in the aqueous solution below the glass slide. Due to the effect of buoyancy, the oil droplet floats up and is captured by the glass slide to form a reverse sitting drop, take a picture, use the software to calculate the contact angle of the oil droplet, and then calcul...

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Abstract

The invention relates to an adsorption inhibitor of carboxybetaine surfactant, which belongs to the technical field of colloid and interface chemistry. This type of adsorption inhibitor is an oligomeric quaternary ammonium salt, the number of nitrogen atoms in the molecule is 3-8, and the number of methylene groups between the nitrogen atoms is 2-8. In aqueous medium, these compounds ionize into polycations. Due to their high charge density, they can be preferentially adsorbed to negatively charged rock or oil sand surfaces, thereby reducing the adsorption of carboxybetaine surfactants on rock or oil sand surfaces. and its hydrophobic effect on rock or oil sand surfaces. For example, it can reduce the saturated adsorption capacity of cetyl dimethyl carboxybetaine on the surface of Daqing oil sands by 48%; in the range of 1×10‑6~1×10‑4mol / L, it can make cetyl The contact angles of aqueous solutions of alkyldimethylcarboxybetaines and didodecylmethylcarboxybetaines on glass slides with negatively charged surfaces decreased from a maximum of >150° to <20°. These compounds can therefore be used as adsorption inhibitors in non-alkali binary compound flooding.

Description

technical field [0001] An adsorption inhibitor of carboxybetaine surfactants, which can inhibit the adsorption of carboxybetaine surfactants on negatively charged rock surfaces, thereby reducing the adsorption loss of surfactants and keeping the rock surface wetted by water, belonging to colloids and interface chemistry technology. Background technique [0002] Due to the non-renewable nature of petroleum, EOR technology has been a strategic research topic worldwide for a long time. This phenomenon is particularly prominent in our country, because with the development of our country's economy and the improvement of people's living standards, the demand for crude oil is increasing year by year. At present, nearly 60% of crude oil depends on imports, while the output of large domestic oil fields is declining year by year. On the other hand, only 30-40% of the crude oil reserves can be recovered by using the existing technology (water flooding), and about 60% of the crude oil ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F17/18C09K8/584C09K23/18
CPCC09K8/584C09K23/00
Inventor 崔正刚祁丹宋冰蕾蒋建中裴晓梅
Owner JIANGNAN UNIV
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