| الوصف: |
Prepare long chain hydrophobic monomer FW-12, achieve aqueous solution polymerization in micelles with acrylamide (AM), acrylic acid (AA), 2 - acrylamide - 2 - methyl propane sulfonic acid (AMPS), and obtain water-soluble hydrophobic associated polymer drag reducing agent FHAPAM. The paper focuses on exothermic characteristics of polymerization process, explores polymerization reaction heat change basic rule in hydrophobic group, studies hydrophobical association of FHAPAM aqueous solution with rheometer, examines effects of salt ions, shear rate and temperature on the properties of the solution, and provides a detailed analysis of changes in the viscoelasticity (storage modulus G', loss modulus G") with shear and frequency; pyrene probe experiment explores polarity and change regularity of the solution; discusses drag reduction performance through analysis of drag reduction mechanism and analyzes its application possibility for slippery water fracturing fluid field. The results show that FHAPAM is greatly impacted by hydrophobic monomer content and carbon chain length, polymerization heat is different from ordinary polyacrylamide, with obvious platform area, under shear performance, FHAPAM solution demonstrates strong thixotropy with increased hydrophobic monomer content, the bigger the loop area of shear curve and recovery curve is, the stronger thixotropy is; solution polarity decreases with hydrophobic monomer content increase, and there is mutational site in I1/I3 ratio; FHAPAM temperature tolerance is stronger than ordinary polyacrylamide (PAM); for different hydrophobic monomer contents, storage modulus (G') and loss modulus (G") show particularity, with G' about2 ~ 3 times of G". Indoor drag reduction performance test shows that, when drug-reducing agent FHAPAM remains in low concentration, its drug reduction effect is better than that of guanidine gum, hydrophobic side chains show strong "self-assembly", forming a supramolecular structure with characteristics of low viscosity, low friction, which ... |
