部分交联聚丙烯酰胺驱油剂的渗流、驱油特性及其耐老化性能

Properties of Core Flow, Displacement and Anti-Ageing of a Partially Crosslinked Polyacrylamide Used as Oil Displacement Agent

朱勇 姜祖明 李江波 刘汉超 郑静 黄光速

ZHU Yong JIANG Zuming LI Jiangbo LIU Hanchao ZHENG Jing HUANG Guangsu

将合成的一种部分交联结构的聚丙烯酰胺聚合物B-PPG 与线性部分水解聚丙烯酰胺HPAM 作对比，在相同条件下研究了其流变特性、渗流特性、驱油效率以及老化性能。研究结果表明，与HPAM 相比，B-PPG 的渗流平衡压力及压力传递的能力显著提高；同时通过双管平行渗流试验，可以观察到“液流转向”的现象，表明B-PPG可以对非均质地层孔道起到调整剖面的作用。微观可视驱油实验证明，B-PPG 可以显著提高驱油效率。通过温度老化实验评价了B-PPG 的耐老化性能，证明B-PPG 在85℃下的老化过程是由弹性逐渐向黏性转变的过程，揭示了B-PPG 能够较长时间保持良好的弹性并具有优良渗流性能的原理。图19表2 参14

Comprehensive properties of core flow, oil displacement efficiency and anti-ageing of the synthesized partially crosslinkedpolyacrylamide （B-PPG ）were investigated through a comparison with conventional partially hydrolyzed polyacrylamide （HPAM）. The research results showed that, the steady-state pressure and the capacity of transfer pressure in the core flow experiment of B-PPG were significantly improved compared with that of HPAM. Meanwhile, a phenomenon of“fluid diversion ” could be observed in double tube core flow experiments, which indicated that B-PPG exhibited profile control ability in non-homogeneous porous media. Furthermore, micro-visualization displacement experiments proved that B-PPG could displace much residual oil after HPAM solution flooding. The ageing experiment demonstrated that B-PPG possessed excellent anti-ageing capability, ensuring that the system could keep excellent viscoelasticity and core flowing property during a long time under the condition of 85℃via a course of the polymer evolution from elastic to viscous.