红山嘴油田红18井区聚合物凝胶-表面活性剂组合调驱技术研究

Research of the Combination of Polymer Gel-surfactant Profile Control Technology in Wellblock Hong 18 of Hongshanzui Oilfield

针对克拉玛依红山嘴油田红18井区克下组油藏流体性质、油层储层特性及非均质性,设计了耐盐型聚合物凝胶体系与表面活性剂的组合调驱段塞,通过优化段塞的组合方式,形成了适应于该油藏的逐级深部调驱技术,并分析了凝胶在多孔介质中的运移-滞留规律,评价了其驱油效果。该组合体系注入聚合物凝胶体系与表面活性剂体系的体积比为1∶0.3,注入聚合物凝胶的强、中强、弱段塞最佳体积比为4∶3∶3,组合调驱方式为强凝胶段塞+表面活性剂段塞+中强凝胶段塞+弱凝胶段塞+表面活性剂段塞+强凝胶封口段塞。该技术在红山嘴油田红18井区现场应用效果显著,12个调驱井组的日产油由85t上升到130t,含水率由75%降至67%。

The flooding slug of salt-tolerant polymer gel and surfactant combination is designed according to the heterogeneity characteristics of reservoir and fluid properties of Wellblock Hong 18 of Hongshanzui Oilfield in Karamay.The deep oil displacement technique suitable for the reservoir is formed through optimizing the combination of slugs.The migration and retention properities of the gel in porous media are analyzed,and the oil displacement effect is evaluated.The results show that the ratio of polymer gel slug and active agent slug is 1∶0.3.The best ratio of strong polymer gel,medium polymer gel and weak polymer gel slug is 4∶3∶3.The way of combination is stronger gel slug+surfactant slug+strong gel slug+weak gel slug+surfactant slug+strong gel sealing slug.The application effect of this technology in Hongshanzui Oilfield is remarkable.In the 12 flooding well groupss daily oil production is rose from 85 tto 130tand the water content is reduced from 75%to 67%.