海上油田特殊黏弹性流体的表征及性能研究

Characterization and Performance Study on the Special Viscoelastic Fluid for Offshore Oilfield

胡建波 刘进祥 卢祥国 赵小平 李辛 付春明 刘健

HU Jian-Bo LIU Jin-Xiang LU Xiang-Guo ZHAO Xiao-Ping LI Xin FU Chun-Ming LIU Jian

采用黏度计、流变仪、动态光散射仪、岩心流动实验和调驱实验装置，研究了具有特殊黏弹性的交联聚合物凝胶和相应聚合物溶液的黏度、黏弹性、分子线团尺寸Dh、流动特性和调驱增油效果等性能特征。结果表明，调整交联剂浓度可以使相同浓度的聚合物溶液生成以“分子内”交联为主的凝胶或以“分子间”交联为主的凝胶。“分子内”交联会使样品的黏弹性大幅度增加。与相同浓度聚合物溶液相比，“ 分子内”交联的凝胶的黏度接近，Dh 略增大，黏弹性明显较大，阻力系数增加了50多倍，残余阻力系数增加了100 多倍，驱油效率提高了6.2% 。

Performance characteristics of partially hydrolyzed polyacrylamide（HPAM）and the pecial viscoelastic Cr3+ cross–linked polymer（CLP, Cr3+ as the cross linker）solution were investigated by the measurement of the viscosity, viscoelasticity, polymer coil dimensions, molecular configuration, flow characteristics, and profile modification using the Bush viscometer, rheometer, dynamic light scattering system and core flow device. The results showed that, under the same polymer solution, intra-molecular cross–linking reaction and inter-molecular cross-linking reaction could take place when the cross-linking agent concentration was proper. The intra-molecular cross-linked would make the viscoelasticity of the system increase obviously. Compared to the polymer solution with the same concentration, the viscosity of intra-molecular cross-linking polymer gel was similar, while the viscoelasticity were a little bigger, and the d rag coefficient increased by 50 times, and the residual resistance coefficient increased more than 100 times, and the oil recovery of the intra-molecular cross–linking polymer gel increased by 6.2%.