为探究多因素交互作用对纳米流体提高采收率的影响,采用Design Expert软件中的Box-Behnken法进行响应面实验设计,以采收率为目标函数建立了注入孔隙体积倍数、注入速度和渗透率三者之间的二次多项回归方程。显著性分析表明,影响纳米流体提高采收率效果的因素按影响程度由大到小依次为渗透率、注入孔隙体积倍数、注入速度;响应曲面分析结果表明,注入速度和渗透率的交互作用对纳米流体提高采收率的影响最大。此外,利用控制变量法研究了渗透率、闷井时间和注入模式对纳米流体提高采收率的影响。研究表明:当纳米流体注入速度为0.2 mL/min、注入孔隙体积倍数为0.5、渗透率为1.00 mD、闷井时间为6 h、注入模式为多周期小段塞时,一次水驱后可再提高采收率18.63个百分点。该研究成果对两亲性MoS2纳米流体在低渗透油藏中应用时的技术政策优化具有借鉴意义。
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 multiple,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 analysis 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 increased 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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