Rheologic Behavior of Aqueous Polymer Solutions in Extension as Influenced by Water Quality

Results of quantitative analyses were presented for recycled produced water for flooding reservoirs in block G80,southern Dagang,and this injection water was characterized by high TSD=20236 mg/L,high contents of Ca2++Mg2+,S2-,and Fe2++Fe3+,high bacterial population of SRB and TGB,and richness in such organic substances as phenols,acids,alcohols,and ketones.It was shown that the viscosity of HPAM polymer solution in the simulation injection water was significantly reduced when the concentration of Fe3+,S2-,or phenol exceeded a relevant definite value.The working principles of HAAKE CaBER 1 extensional rheometer was described,the extensional rheologic behavior was investigated for aqueous solutions of three EOR polymers of concentration 1500 mg/L at 25℃ and curves of midpoint diameter,Dmid,of polymer solution filament in extension vs time,t,and of apparent extensional viscosity,ηapp,vs Hencky strain,e(=ln[D0/Dmid]),were obtained.For distilled water solution of polymer 10203 with active,sterically hinderedfunctionalities in side groups,the midpoint diameter slowly decayed with time,the filament ruptured in a longer time and the apparent viscosity notably increased with strain that demonstrated a high elasticity of the polymer solution;for distilled water solutions of standard HPAM polymer 63026 and of comb like polymer KY-2,the midpoint diameter fast diminished,the solution filament ruptured in a shorter time and the apparent viscosity moderately increased with strain that indicated poorer elasticity of the two polymer and,in particular,of polymer KY-2.The extensional behavior of polymer 10203 solution deteriorated significanlty in the simulation injection water and became much more worse in the real injection water.