Synthesis and Performance of an Acrylamide Copolymer Containing Nano-SiO₂ as Enhanced Oil Recovery Chemical

Figure 10

Salt tolerance ((a) NaCl, (b) CaCl₂, and (c) MgCl₂⋅6H₂O) of AM/AA and AM/AA/NSFM solutions (0.5 wt%) at 20°C. The viscosity of copolymer solution was measured by Brookfiled DV-3 viscometer at 7.34 s⁻¹ using number 62 rotor (rotation speed: 18.8 r/min) or number 61 rotor (rotation speed: 18.5 r/min).

(a)

(b)

(c)