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Molecular Design Principles for Developing High-Performance and Environmentally Friendly Shale Inhibitors Using Amino
Aurchy Dauriant Kinkeyi Moukoko1, Lili Yang1, Yueqi Zhang1
1MOE Key Laboratory of Petroleum Engineering, State Key Laboratory of Petroleum Resources and Prospecting, College of Safety and Ocean Engineering, China University of Petroleum (Beijing), Changping, Beijing 102249, China.
ACS Omega
|August 1, 2026
Summary
Amino acid ionic liquids (AAILs) offer a novel solution for high-performance shale inhibition by combining specific anions and cations. A glycine-based AAIL demonstrated superior clay swelling reduction and shale recovery, outperforming traditional inhibitors.
Area of Science:
- Materials Science
- Chemical Engineering
- Petroleum Engineering
Background:
- Conventional shale inhibitors struggle with simultaneous charge screening and deep intercalation.
- Designing high-performance shale inhibitors requires addressing these functional deficiencies.
Purpose of the Study:
- To propose and evaluate amino acid ionic liquids (AAILs) as a unified solution for shale inhibition.
- To investigate the correlation between AAIL molecular design and performance.
Main Methods:
- Experimental investigations included linear swelling, shale recovery, immersion, and viscosity tests.
- Material characterization involved particle size distribution, SEM, and XRD analysis.
- AAILs were designed by combining anions for clay binding and cations for charge neutralization.
Main Results:
- Anion size, functional groups, and charge distribution are key to AAIL performance.
- Small anions like glycinate enable deep intercalation and cross-linking.
- [Veim]-[Gly] AAIL achieved 88.90% shale recovery and >70% clay swelling reduction.
Conclusions:
- AAILs with specific anion designs offer superior shale inhibition compared to traditional methods.
- The synergistic effect of glycinate-based AAILs provides effective clay stabilization.
- This study provides a principle for designing high-performance, eco-friendly shale inhibitors.
