聚合物分子构型及其对驱油效果的影响

Polymer molecular structure and its effect on polymer flooding

针对大庆油田聚合物驱过程中采出污水利用技术问题 ,研究了不同聚合物溶液内分子构型特征及其对聚合物驱油效果的影响 .研究结果表明 ,聚合物分子构型与溶剂中K+ ,Na+ 的质量浓度有关 ,清水聚合物溶液中聚合物分子构型以网状构型为主 ,增黏效果好 ;污水聚合物溶液中聚合物分子构型以枝状构型为主 ,带状和网状构型为辅 ,增黏效果较差 ;剪切作用会改变聚合物分子构型和几何尺寸 ;与污水聚合物溶液相比 ,清水聚合物溶液中聚合物分子线团回旋半径较大 ,进而增大聚合物的增黏性和滞留特性 ,使波及体积扩大和驱油效果提高 .

In order to use sewage water from polymer flooding units in Daqing oil field, the relationship between polymer molecular structure and its flooding efficiency have been studied in this paper. The experimental data show that there is a relationship between polymer molecular structure and concentration of K^+ and Na^+, polymer molecule has the network structure in fresh water, and its solution has higher viscosity. Polymer molecule has dendritical structure in sewage water, and its solution has lower viscosity. Shearing action will change polymer molecule type and its size. Compared with cyclotron diameter of polymer molecule in sewage water,cyclotron diameter of polymer molecule is larger in fresh water,which will increase property on viscosity and adsorption,and is beneficial to enhanced oil recovery for polymer flooding.