A Method of Stabilizing Amphiphilic Janus Nanosheets in Salt Water
The depletion of oil and gas production in conventional reservoirs drove the industry to tacklethose difficult-to-exploit reservoirs in one of which was the high salinity reservoirs, e.g., the formation brine contained 8 wt% NaCl and 2 wt% CaCl2. In recent years, nanofluids have been widely studied for enhancing oil recovery and demonstrated to be very effective for such applications. However, to apply this fluid in those high salt environment, maintaining colloidal stability is one of the most important prerequisite. Herein, we reported using a kind of stabilizer at low concentration, e.g., non-ionic polymer, hydroxyethyl cellulose, to stabilize amphiphilic Janus nanosheets in high concentration brine containing 8 wt% NaCl and 2 wt% CaCl2. The fluid system was very stable for long time. After adding the system with oil phase at high temperature, the amphiphilicity of nanosheets still retained.
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Zhifeng Ren
Professor, Department of Physics