Liu Nannan, Chen Yan, Jiang Wanjun, Chen Xinglong, Du Hui, Xu Hui, Zhang Yingnan, Zhao Huijun, Ju Binshan
Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology, School of Petroleum Engineering, Changzhou University, Changzhou, 213164, Jiangsu, China.
North China Center of Geoscience Innovation, Tianjin Center, China Geological Survey (CGS), Tianjin, 300170, China.
J Mol Model. 2022 Aug 20;28(9):264. doi: 10.1007/s00894-022-05277-7.
The dispersion of silica dioxide (SiO)/sodium lauryl sulfate (SDS) has been widely used in hydrocarbon reservoirs, but its instability is still a problem in practical engineering applications. The dispersion morphology of SiO nanoparticles before and after modification was studied by TEM, and the thermal stability of different foam dispersions was evaluated by FoamScan. In this paper, the mechanism of foam stability was investigated by combining the measurement of interfacial energy of nanoparticles at the gas-liquid interface with dynamics simulation of molecular diffusion. The results showed that SiO/SDS dispersions had good thermal stability due to the synergistic effect of SiO nanoparticles and SDS. The addition of SiO nanoparticles improved the interfacial energy and interfacial activity at the gas-liquid interface, meanwhile limited the movement of SDS molecules and water molecules, which was beneficial for foam stability. Notably, the addition of modified SiO nanoparticles further enhanced the interfacial energy at the gas-liquid interface and strengthened the restriction of water/SDS molecular movement, thereby slowing down the drainage and decay of the foam dispersions. The mechanism investigation of SiO/SDS dispersions was of benefit to foam flooding in hydrocarbon reservoirs.
二氧化硅（SiO）/十二烷基硫酸钠（SDS）分散体已在油气藏中得到广泛应用，但其不稳定性在实际工程应用中仍是一个问题。通过透射电子显微镜（TEM）研究了改性前后SiO纳米颗粒的分散形态，并通过泡沫扫描（FoamScan）评估了不同泡沫分散体的热稳定性。本文通过结合纳米颗粒在气液界面的界面能测量与分子扩散的动力学模拟，研究了泡沫稳定性的机理。结果表明，由于SiO纳米颗粒与SDS的协同作用，SiO/SDS分散体具有良好的热稳定性。SiO纳米颗粒的加入提高了气液界面的界面能和界面活性，同时限制了SDS分子和水分子的运动，这有利于泡沫的稳定性。值得注意的是，改性SiO纳米颗粒的加入进一步提高了气液界面的界面能，加强了对水/SDS分子运动的限制，从而减缓了泡沫分散体的排液和衰变。对SiO/SDS分散体的机理研究有利于油气藏的泡沫驱油。
