低渗岩心实验参数在微乳液驱数值模拟中的应用

Application of Low Permeability Core Experimental Parameters in Numerical Simulation of Microemulsion Flooding

殷代印 高 楠

YIN Daiyin， GAO Nan

为研究岩心实验数据在数值模拟中的应用效果， 测得正丁醇、 十二烷基硫酸钠在渗透率 10×10-3～15×10-3μm2的天然岩心中的动态吸附量与浓度的关系， 为数值模拟提供动态吸附参数依据。配制了以原油、 正丁醇、十二烷基硫酸钠为主剂的微乳液体系， 采用 “压差流量法” 测定微乳液体系在低渗透率天然岩心中的启动压力梯度， 并进行了驱替实验。将实验测得的参数应用在数值模拟软件 CMG中进行岩心小尺度数值模拟。研究结果表明， 在渗透率 10×10-3～15×10-3 μm2岩心中， 十二烷基硫酸钠质量分数达 4%时， 吸附基本平衡， 动态吸附量约4.2 mg/g， 当正丁醇质量分数达 10%时， 吸附基本平衡， 动态吸附量 3.2 mg/g。在岩心实验中测得的正丁醇、 十二烷基硫酸钠动态吸附量可以直接应用在数值模拟中， 实验测得的启动压力梯度需要进行适当的调整， 调整后的模拟结果与实际岩心实验拟合较好。图 6表 5参 11

In order to study the application of core experimental data in numerical simulation， the relationship between the dynamic adsorption capacity of n-butanol and sodium dodecyl sulfate in natural cores with permeability of 10 × 10-3—15 × 10-3 μm2and their concentration was measured， which could provide basic dynamic adsorption parameters for numerical simulation. A micro-emulsion system was prepared with crude oil， n-butanol and sodium lauryl sulfate as main agents， and the threshold pressure gradient of microemulsion system in low permeability natural cores was determined using the differential pressure flow method， and the displacement experiment was carried out. The experimentally measured parameters were applied to the numerical simulation software CMG for small-scale numerical simulation of cores. The results showed that as for the core with the permeability of 10× 10-3—15×10-3μm2， the adsorption equilibrium of the sodium lauryl sulfate and n-butanol could be reached， respectively， when their mass fraction was 4% and 10%， respectively， and their dynamic adsorption capacity was 4.2 mg/g and 3.2 mg/g ， respectively. The dynamic adsorption capacity of n-butanol and sodium dodecyl sulfate measured in the core experiment could be directly used in the numerical simulation， while the experimentally measured threshold pressure gradient need to be adjusted appropriately. The adjusted simulation results was in good agreement with the actual core experiment.

10.19346/j.cnki.1000-4092.2018.01.021