Optimization of Amphipathic MoS2 Nanofluids for Enhanced Oil Recovery in Low-Permeability Reservoirs by Response Surface Methodology
By exploring the influence of multi-factor interaction on enhanced oil recovery of nanofluids,a response surface experimental is designed by using Box-Behnken method in Design Expert.Taking the recovery rate as the objective function,a quadratic polynomial regression equation is established among the injection pore volume multi-ple,the injection rate and the permeability.The significance analysis shows that the factors affecting the enhanced oil recovery by nanofluids are:permeability,injection pore volume multiple,injection rate;The response surface a-nalysis indicated that the interaction between injection rate and permeability has the greatest impact on the enhanced oil recovery of nanofluids.In addition,the effects of permeability,shut-in time and injection mode on the enhanced oil recovery of nanofluids were studied by using the control variable method.The research indicates that when the nanofluid injection rate is 0.2 mL/min,the injected pore volume multiple is 0.5,the permeability is 1.00 mD,the shut-in time is 6 hours,and the injection mode is multi-cycle pill injecting,the recovery rate can be further in-creased by 18.63 percent points after a single water flooding.The research results have reference significance for the technical optimization of amphipathic MoS2 nanofluids for enhanced oil recovery in low-permeability reservoirs.
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