超低浓度有机铬交联聚合物凝胶驱油效率研究

Efficiency of Oil Displacement by Ultra-Low Concentration Organic Chromium Cross-Linked Polymer Gel

通过物理模拟并联岩心驱油实验，得到在岩心渗透率极差为60倍条件下，聚合物质量浓度在200-800mg／L，铬交联聚合物凝胶注入总量为0．2PV时，凝胶体系随聚合物质量浓度的增加，提高原油采收率幅度明显下降。实验结果表明，超低质量浓度聚合物有机铬凝胶体系采用成胶后注入油层，具有较高的黏度和较好的稳定性，避免了聚合物凝胶在岩心中诸多不确定因素对成胶效果的影响，双管岩心驱油实验可提高采收率9％-16％．

By physical simulation parallel core displacement test, the range of EOR by gel system will obviously decline with the increase oi polymer concentration in the conditions of core permeability ratio of 60 times, polymer concentration of 200-800 mg/L and total chromium cross-linked polymer gel injection of 0.2 PV. The result shows that the ultra-low concentration polymer organic chromium gel system has high viscosity and stability after injecting into the reservoir, avoiding the affect of many uncertain factors caused by the polymer gel inject- ink into the reservoir on the gel system. It is concluded that the duel-tube parallel core displacement test can improve EOR by 9%-16%.