Synthesis And Evaluation Of Nonionic NVES Surfactant

Nonionic surfactant (NVES) is synthesized by four-step method and the optimal reaction conditions for the synthesis of nonionic surfactant NVES which the ratio of n(NaOH) and n(morpholino-o-epichlorohydrin oleic acid) is1.1, the temperature is110℃,reaction time is30min, and is determined through the optimization of synthesis conditions and the analysis of the effect condition.With the method of infrared spectroscopy analyzing synthetic product, synthetic product is the target product NVES.NVES can form a surfactant fracturing fluid system which has good shear resistance, filtration resistance, broken plastic, and recycling and many other properties.Non-ionic surfactant (NVES) has excellent advantage in the interfacial tension, shear resistance, filtration resistance, breaking gum, carrying sand capacity over conventional guar gum fracturing fluid, cationic and anionic VES fracturing fluid and NVES whose viscosity is barely influenced by shearing and reduction viscosity of the glue is not broken by the chemical degradation (oxidation degradation and shear) cause but purely a physical process change of micelle doesn’t require saline thickening.After a feasibility analysis for NVES fracturing fluid recycling and reusing technology, Simulation experiment of NVES fracturing fluid is carried out indoors with recovery, purification and concentration while macro and micro aspects of the first, second recycling NVES are evaluated.Experimental results show that the viscosity of the second recycling NVES is100mPa-s with temperature of70℃under shearing rate of170s-1after shearing30min, the minimum value of the interfacial tension is0.0135mN/m, and the residue content is3.2mg/L, which still has good performance.