Viscoelastic rheological property of different types of polymer solutions for enhanced oil recovery
The capability of hydrophobic association polymer (HAPAM) to displace oil is different from that of hydrolyzed polyaerylamide (HPAM) because they have different rheological properties. The viscoelasticity of five polymers was measured using Physica MCR301 rheometer and was compared. The five polymers include three HAPAMs with relative molecular mass of 1 248×104 (TypeⅠ), 750×104 (TypeⅡ), and 571×104 (Type Ⅲ) separately and two HPAMs with relative molecular mass of 1 200×104 and 3 800×104 respectively. The experiment results indicate that the viscoelasticity of HAPAM is better than that of HPAM. The storage modulus G and the loss modulus G for HAPAM solutions are also larger than those for HPAM. Comparing the rheologieal curves of different HAPAM types, it is found that the viscosity of type Ⅱ and type Ⅲ is almost same at different shear rates while the viscosity of type Ⅰ is the lower than that of Types Ⅱ and Ⅲ. The storage modulus G and the loss modulus G for three types of HAPAM were measured in low oscillation frequency range, and the results show that G is greater than G for all three different types of HAPAM, but their loss modulus is almost same, and the G is in the order of type Ⅱ＞type Ⅲ＞type Ⅰ. In addition, the G and G increase with aging time for all three HAPAM solutions were stayed at different days. The viscoelasticity of type Ⅰ reaches the highest value when aging time is 9 d at 45 ℃ but it is 7 d for type Ⅱ and type Ⅲ The different viscoelasticity properties can be attributed to self-organization supermolecule networks which is formed by hydrophobic association of HAPAM molecular and molecular chain entanglement.
hydrophohic association polymer rheology storage modulus loss modulus self-organization aggregate
MENG Ling-wei(孟令伟) KANG Wan-li(康万利) ZHOU Yang(周阳) WANG Zhi-wei(王志伟) LIU Shu-ren(刘述忍) BAI Bao-jun(白宝君)
Enhanced Oil Recovery Research Center, China University of Petroleum, Qingdao 266555, China Missouri University of Science and Technology, Rolla, MO 65401, USA
国际会议
长沙
英文
126-129
2008-09-28（万方平台首次上网日期，不代表论文的发表时间）