Solution characteristics research of the linear and network-type water-soluble polymer

The linear part of the hydrolysis of polyacrylamide(HPAM)and the hydrophobically associating water-soluble polymer(HWAP)with network structure are two kinds of polymer to enhance oil recovery in oil displacement at present.Compared the two polymers with viscosity-concentration properties and viscosified mechanisms were showed in this paper.The viscosity of HPAM mainly acted linear increase as increasing the concentration and two critical associating concentrations existed in aqueous solutions for AP-P4.Also the rheological characteristic of the two polymers was compared and the elastic modulus G′ and loss modulus G″ of solution were increasing in different extents as increasing the concentration.For HPAM,the viscoelasticity of solution was better with the concentration and tangles between molecular chains were increased.For AP-P4,the viscoelasticity of solution became obvious with the concentration and hydrophobic associating joint forces between molecular chains were increased.The microcosmic morphology of two kinds of polymer were observed by the atomic force microscope(AFM).There were only some different sizes of the group of substance and no obvious space network structure for HPAM.The HAWP would form aggregation,and further form obvious space network structure as increasing the concentration.These phenomena had great theoretical significance to enhance oil recovery process for oil displacement.