Effects of introducing AMPS monomer and conjugate monomer on rheological property and oil displacement efficiency of polymers
The hydraulic properties and oil displacement properties of ultra-high molecular weight copoly-mer(HMWP)formed by the AMPS monomer and ultra-high molecular weight conjugated polymer(AP-P5)formed by the conjugate monomer were studied.Laboratory experiments showed that the introduction of AMPS monomer and conjugate monomer could significantly improve the viscosity and viscoelastic prop-erties of polymer.At a concentration of 2 000 mg/L,the viscosity of AP-P5 and HMWP increased by 250.0%and 85.1%,the viscoelastic composite modulus increased by 36.7%and 34.3%,respectively,and the 60 d viscosity retention rate were 60.9%and 82.6%,respectively,relative to the conventional polymer.Static adsorption experiments showed that when the concentration of HMWP exceeded 200 mg/L,the adsorption capacity reached balance,while that of AP-P5 increased with the increase of the concentra-tion.The results of oil displacement experiments showed that the recovery improvement of AP-P5 and HM-WP was 11.0%and 15.7%,respectively.Therefore,the introduction of AMPS monomer is more condu-cive to the improvement of polymer flooding effect in the high-temperature and high-salt reservoirs.Field tests showed that the effect of decreasing produced water and increasing oil was remarkable for HMWP,which can provide a technical support for greatly improving oil recovery in the high temperature and high salt reservoirs in Shengli oilfield.
temperature and salt resistanceultra-high molecular weight copolymerrheologyoil dis-placement efficiency
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