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Synthesis of Gemini Ammonium Sulfobetaine and Its Proppant Suspension and Gel-breaking Mechanisms by Tao Wang; Jianhong Xiao; Lushan Wang; Aiqing Ma; Mimi Tian; Chen Wang is a Materials Science article available to read on EtoBox.

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In this study, gemini ammonium sulfobetaine (GAS) is designed and synthesized using isophorone diisocyanate connecting the ammonium sulfobetaines (AS) to obtain a viscoelastic surfactant exhibiting better viscosification and salt resistance. AS is prepared using the monomers of erucic acid, __N__-dimethyl-1,3-propanediamine, and 3-chloro-2-hydroxypropanesulfonic acid sodium. The properties of GAS and its proppant suspension as well as the gel-breaking mechanisms are investigated. The critical micelle concentration of GAS is 2.1 × 10^−7^ mol mL^−1^. GAS exhibits good salt resistance, and the viscosity is considerably high under acidic conditions. At 0.5 Hz, the storage modulus __G__′ of GAS is 60, 120, and 640 mPa when the concentration is 0.3, 0.5, and 1.0 wt%, respectively. Its proppant suspension is optimal under acidic conditions. When the pH is high, the setting velocities are clearly observed to increase. When the pH is 12, the rate of decline is more than 50% after 200 min. Some of the worm-like micelles adsorbed on the proppant surface participate in the formation of the three-dimensional network, appropriately supporting the proppant-carrying performance. When potassium per

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Author

Tao Wang; Jianhong Xiao; Lushan Wang; Aiqing Ma; Mimi Tian; Chen Wang

Publisher

The Royal Society of Chemistry

Published

2020

Language

EN

Field

Materials Science (Physical Sciences)