Kalam Shams, Abu-Khamsin Sidqi A, Kamal Muhammad Shahzad, Patil Shirish
Department of Petroleum Engineering, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Saudi Arabia.
Center for Integrative Petroleum Research, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Saudi Arabia.
ACS Omega. 2021 Nov 24;6(48):32342-32348. doi: 10.1021/acsomega.1c04661. eCollection 2021 Dec 7.
The need to minimize surfactant adsorption on rock surfaces has been a challenge for surfactant-based, chemical-enhanced oil recovery (cEOR) techniques. Modeling of adsorption experimental data is very useful in estimating the extent of adsorption and, hence, optimizing the process. This paper presents a mini-review of surfactant adsorption isotherms, focusing on theories of adsorption and the most frequently used adsorption isotherm models. Two-step and four-region adsorption theories are well-known, with the former representing adsorption in two steps, while the latter distinguishes four regions in the adsorption isotherm. Langmuir and Freundlich are two-parameter adsorption isotherms that are widely used in cEOR studies. The Langmuir isotherm is applied to monolayer adsorption on homogeneous sites, whereas the Freundlich isotherm suites are applied to multilayer adsorption on heterogeneous sites. Some more complex adsorption isotherms are also discussed in this paper, such as Redlich-Peterson and Sips isotherms, both involve three parameters. This paper will help select and apply a suitable adsorption isotherm to experimental data.
对于基于表面活性剂的化学强化采油（cEOR）技术而言，将岩石表面的表面活性剂吸附降至最低一直是一项挑战。吸附实验数据的建模对于估算吸附程度进而优化该过程非常有用。本文对表面活性剂吸附等温线进行了简要综述，重点关注吸附理论以及最常用的吸附等温线模型。两步吸附理论和四区吸附理论广为人知，前者表示分两步进行吸附，而后者在吸附等温线中区分出四个区域。朗缪尔等温线和弗伦德利希等温线是两参数吸附等温线，在cEOR研究中广泛应用。朗缪尔等温线适用于在均匀位点上的单层吸附，而弗伦德利希等温线适用于在非均匀位点上的多层吸附。本文还讨论了一些更复杂的吸附等温线，如雷德利希-彼得森等温线和西普斯等温线，两者都涉及三个参数。本文将有助于为实验数据选择和应用合适的吸附等温线。
