Enhancing surfactant desorption through low salinity water post-flush during Enhanced Oil Recovery

Ichhuy Ngo, Kyuro Sasaki, Liqiang Ma, Ronald Nguele, Yuichi Sugai

研究成果: Contribution to journalArticle査読

抄録

Low Salinity Water (LSW) incorporates in surfactant Enhanced Oil Recovery (EOR) as a pre-flush is a common practice aiming to reduce the formation salinity, affecting surfactant adsorption. However, in a field implementation, the adsorption of surfactant is unavoidable, thus, a scheme that detaches the trapped surfactant is important. To address this, LSW was considered to enhance the desorption of surfactant. LSW solely formulated from NaCl (1 wt.%), Sodium Dodecylbenzene Sulfonate (SDBS) was chosen as the primary surfactant at its critical micelle concentration (CMC, 0.1 wt.%). Injecting LSW as post-flush achieved up to 71.7% of SDBS desorption that lower interfacial tension against oil to 1.3 mN/m, hence, bring the total Recovery Factor (RF) to 56.1%. This result was 4.9% higher than when LSW injecting as pre-flush and 5.2% greater than conventional surfactant flooding (without LSW). Chemical analysis revealed salinity reduction induced Na+ ion adsorption substitution onto pore surface resulting in an increment in surfactant desorption. The proposed scheme resolved the problems of adsorbed surfactant after EOR, and further improve the economic viability of surfactant EOR.

本文言語英語
論文番号68
ジャーナルOil and Gas Science and Technology
76
10
DOI
出版ステータス出版済み - 2021

All Science Journal Classification (ASJC) codes

  • 化学工学(全般)
  • 燃料技術
  • エネルギー工学および電力技術

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