Abstract:

In order to study on viscoelasticity of associative polymer solution(APS) in actual reservoir, the viscoelasticity of APS has been studied when concentration and salinity vary in Daqing main reservoirs temperature and formation water salinity of oil field. The results show: the influence of concentration and salinity on the viscoelasticity of APS is the same as on HPAM solution; The viscoelasticity of HPAM solution is resulted from tangle between molecular chains, while the viscoelasticity of APS is mainly caused by the associating action between molecular chains, therefore APS shows obvious elasticity in lower concentration; In low and wide frequency scope, the elasticity of APS is larger than the one of HPAM solution obviously, which explains that APS will show obvious elasticity in lower shear velocity when APS flows in porous media, which signifies that the purpose may be achieved by using polymer solution′s elasticity to enhance displacement efficiency in not very high injecting rate.
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Key words: associating polymer, viscoelasticity, hydrolyzed partially polyacrylamide(HPAM), concentration, salinity