Enhancing oil recovery by alkane-modified molybdenum disulfide nanosheets with the optimum alkyl chain length: The balance between dispersity and hydrophobicity to achieve high interfacial activity

Preparation and Oil Displacement Performance Evaluation of Amphiphilic Janus Molybdenum Disulfide Nanosheets

“…The separation pressure is generated by the wedge-shaped membrane structure formed at the three-phase interface, which favors the stripping of crude oil from the rock surface. Moreover, numerous studies have shown that many nanomaterials have been successfully applied to enhance oil recovery, including silicon dioxide (SiO 2 ), , graphene oxide (GO), − and molybdenum disulfide (MoS 2 ). , When Luo et al studied the displacement performance of low-concentration nanofluids, they found that the displacement efficiency of a single GO nanoparticle was 5% lower at low concentration, but the GO modified by amphiphilic had a better displacement effect even at low concentration, and the recovery rate could reach 15.2%. Cao et al used amino polyethylene glycol hydroxyl (NH 2 –PEG–OH) and octadecylamine (ODA) to modify GO; the modified GO can form a stable interfacial film at the oil–water interface, and the recovery rate was 10% higher than that of unmodified GO.…”

Development of Anionic-Modified Black Nanosheet and Its Oil Imbibition Performance in Ultralow-Permeability Reservoirs

“…Yao et al modified black nanosheet with different chain length modifiers to change their hydrophilic–lipophilic values, finding that the longer the carbon chain length of the modifier, the closer the nanosheets approached neutral wetness and the stronger the interfacial activity. Geng et al observed that when the salinity did not exceed 5000 mg/L, octadecyl amine-modified black nanosheets had the best interfacial activity, while dodecyl amine-modified and octylamine-modified black nanosheets performed best at salinities of 10,000 and 20,000 mg/L. Zhang et al found that compared to physical modification, chemical modification of black nanosheet using dodecyl mercaptan resulted in better stability in brine, lower interfacial tension, and stronger emulsification capabilities.…”