Host-Guest recognition strengthened supramolecular preformed particle gel for conformance control in low-permeability fractured reservoirs

• Published in: Journal of molecular liquids Vol. 412; p. 125893
• Main Authors: Li, Zhe, Hao, Jiting, Lu, Yao, Yu, Zhixue, Yang, Hongbin, Zhou, Bobo, Jiang, Haizhuang, Sarsenbekuly, Bauyrzhan, Kang, Wanli
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.10.2024
• Subjects: Host-guest recognition; Low-permeability fractured reservoir; Preformed particle gel (PPG); Self-healing; Supramolecular interaction; Host-guest recognition; Self-healing; Preformed particle gel (PPG); Low-permeability fractured reservoir; Supramolecular interaction
• ISSN: 0167-7322
• DOI: 10.1016/j.molliq.2024.125893

•The supramolecular preformed particle gel (S-PPG) with macroscopic self-healing behaviors was synthesized.•The viscoelasticity, mechanical strength and stability of S-PPG were systematically investigated.•The conformance control performance of S-PPG was studied in low-permeabilty fractured reservoirs. The conventional preformed particle gels (PPG) have problems of irreversibly shear-breakage after shearing actions during the application for conformance control in low-permeability fractured reservoirs. Herein, a novel host–guest recognition strengthened supramolecular PPG (S-PPG) was synthesized with synergistically non-covalent and covalent crosslinking structures, using host (allyl β-CD) and guest (cetyldimethylallyl ammonium chloride) monomers. Firstly, the chemical structures and micro-morphologies of S-PPG were systematically characterized by FTIR, Cryo-SEM, EDS and AFM methods. Then, the dispersion and thermal stability, swelling properties and rheological properties, including viscoelasticity, creep-recovery and shear self-healing abilities, of S-PPG were investigated, respectively. Finally, the low-permeability cores with fractures were used to identify the injectivity and plugging properties of S-PPG and conventional PPG. The results showed that the S-PPG exhibited strong crosslinking network, high dispersion and thermal stability. In addition, the S-PPG also displayed better swelling, viscoelasticity, creep-recovery and shear self-healing ability after equilibrated swelling process compared to those of conventional PPG. Finally, the S-PPG exhibited considerable compatibility with low-permeability cores with fracture width of 0.05 mm, and produced higher plugging rate (93.53 %) than conventional PPG (86.35 %). Therefore, the newly formulated supramolecular preformed particle gel (S-PPG) containing host–guest recognition can provide a new approach for solving the problems of irreversibly shear-breakage and improving the conformance control performance of PPG in low-permeability fractured reservoirs.