Qinfang Ding

TL;DR: In this article, the surface and interfacial properties of five zwitterionic surfactants, including three propyl sulfobetaines CSB (where the carbon atom number of the alkyl chain is 12, 14 and 16, respectively) and two hydroxypropyl sarsobetaine surfactant CHSB (with carbon atom numbers 12 and 14, respectively), were studied at both air-water and oil-water interfaces.

TL;DR: In this paper, the effect of surfactants in the fracturing fluid on the adsorption-desorption processes of coalbed methane (CBM) was studied by conducting an isothermal adaption and desorption experiment.

TL;DR: In this paper, the formation and properties of wormlike micelles composed of a surfaceactive surfactant N-hexadecyl-N-methylpiperidinium bromide (C16MDB) and organic salt sodium salicylate (NaSal) at room temperature were studied.

Abstract: To develop a highly efficient foaming agent, the fluorocarbon surfactant (4-hydroxyethylether) (pentadecafluoroalkyl) amide was designed and synthesized and the surface activity and foaming performance were investigated through surface tension, surface viscosity and foaming performance measurements. The results show that the fluorocarbon surfactant has superior surface activity and can reduce the surface tension of water to 15.3 mN m−1. When used as a foaming agent, it also shows great advantages over conventional hydrocarbon surfactants. For the sake of cost reduction, sodium dodecyl sulfate (SDS) was added to construct a highly efficient foaming agent. The results show that the mixture has superior surface activity and great foaming ability. Surface viscosity measurements show that surface viscosity of the mixture is much higher than that of single SDS. The foam integrated value of the mixture is enhanced by about 67% compared to SDS. The optimized formula of the foaming system is 0.03–0.08% HPA4 + 0.20–0.40% SDS.

TL;DR: In this article, a fatty amine polyoxyethylene ether diethyl disulfonate surfactant was used for displacement of oil of a harsh reservoir under high temperature, high salinity and high hardness.