摘要
模拟油田含S^(2-)污水配制聚丙烯酰胺(HPAM)溶液,利用FTIR、黏度计、流变仪等研究了S^(2-)含量对HPAM分子结构及溶液黏弹性的影响。表征结果显示,S^(2-)存在下,聚合物分子主链C—C键发生断裂导致溶液黏弹性降低。实验结果表明,随S^(2-)含量的增大,聚合物溶液表观黏度下降速率增大。在实验应力范围内,S^(2-)含量不同的聚合物溶液均出现线性黏弹区,但随S^(2-)含量的增大,聚合物溶液线性黏弹区对应的复合模量逐渐降低,储能模量和损耗模量均减小。S^(2-)含量较高时,聚合物增黏效果变差。随剪切速率的增大,法向应力差逐渐增大;S^(2-)含量越高,法向应力差增幅越显著。在剪切速率为7.34 s-1下,当S^(2-)含量低于1.7 mg/L时,法向应力差保留率大于表观黏度保留率;当S^(2-)含量高于1.7 mg/L时,表观黏度保留率大于法向应力差保留率。
Hydrolyzed polyacrylamide（HPAM） solutions were prepared using simulated oilfield sewage containing S2- and the effects of S2- content on the molecular structure and viscoelasticity of the HPAM solutions were investigated by means of FTIR, viscometer and rheometer. The results showed that the viscoelasticity of the polymer solutions decreased due to the break of C-C bonds in the main chains of HPAM. It was indicated that the decline rate of the polymer apparent viscosity increased with the increase of the S2- content. The polymer solutions with different S2- content showed linear viscoelastic region. With the increase of S2- content, the composite modulus of the polymer solutions in relation to the linear viscoelastic region gradually reduced, and both the storage modulus and the loss modulus reduced. When the S2- content was high, the tackability of HPAM weakened. With increasing shear rate, the first normal stress difference increased gradually. The higher the S2 content was, the more obvious the normal stress difference increased. When the shear rate was 7.34 s-1 and the S2 content was less than 1.7 mg/L, the normal stress difference retention rate was greater than the apparent viscosity retention rate, and when the S2 content was higher than 1.7 mg/L, the apparent viscosity retention rate was greater than the normal stress difference retention rate.
出处
《石油化工》
CAS
CSCD
北大核心
2016年第6期701-706,共6页
Petrochemical Technology
基金
中国石油化工股份有限公司资助项目(211048)
关键词
聚丙烯酰胺
驱油聚合物
硫离子
黏弹性
储能模量
损耗模量
法向应力差
hydrolyzed polyacrylamide
flooding polymer
sulfide ion
viscoelasticity
storagemodulus
loss modulus
normal stress difference
