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  • Can nonionic polyacrylamide be used as a gel fracturing fluid?
  • Nonionic polyacrylamide (NPAM) with controlled molecular weight was successfully synthesized as a gel fracturing fluid by aqueous solution polymerization.
  • What factors affect NPAM molecular weight?
  • The effects of the monomer concentration, initiator concentration, reaction time, feeding temperature and reaction temperature on the molecular weight were systematically investigated through single-factor and orthogonal experiments. The NPAM molecular weight can be controlled by adjusting these factors.
  • What is high molecular weight polyacrylamide (PAM)?
  • Provided by the Springer Nature SharedIt content-sharing initiative High molecular weight (106–3 × 107 Da) polyacrylamide (PAM) is commonly used as a flocculant in water and wastewater treatment, as a soil conditioner, and as a viscosity modifier and friction reducer in both enhanced oil recovery and high volume hydraulic fracturing.
  • Does increasing NPAM molecular weight affect gel entanglement?
  • It is demonstrated that increasing the NPAM molecular weight and concentration strengthens the degree of gel network entanglement, resulting in shortened gelation time and enhanced gel strength. For every million increases of NPAM molecular weight ranging from 485 × 10 4 to 1217 × 10 4 Da, the gelation time reduces by 1.7 h.