摘要
为了有效治理塔河油田高温高盐河道砂油藏的水窜问题并提高水驱波及效率,采用基于Kozeny-Carman方程优化筛选的冻胶颗粒与0.5%起泡剂APF-1氮气泡沫构建复合调驱体系,并通过并联填砂管驱替实验系统分析了其协同作用机制。研究结果表明:①冻胶颗粒通过动态深部调剖过程(运移—封堵—再运移—再封堵),呈现直接封堵、架桥封堵和吸附滞留3种模式,封堵高渗通道效率达98.2%,调剖效率达95.2%,使高渗透层分流率从83%降至40.8%,低渗透层分流率从17%升至59.2%,宏观上显著扩大注水波及体积;②氮气泡沫通过贾敏效应增加渗流阻力,控制流度,同时降低油水界面张力,有效启动低渗透区剩余油,微观洗油效率提升15.3%;③复合调驱使采收率从水驱阶段37.3%提高至59.8%,增幅22.5%,较之于单一冻胶颗粒调剖效率提升10.3%;④现场应用3轮次18井次后,井组综合含水率从76.9%降至60%,累计增油2693 t,阶段采油指数从0.45提升至0.85 m^(3)/(MPa·d),措施有效率达80%。结论认为,“冻胶颗粒+氮气泡沫”复合调驱技术通过宏观波及扩展与微观洗油强化的多尺度协同,可以有效抑制水窜、优化渗流场,对高温高盐砂岩油藏具有普适性,为类似油藏开发中后期提高采收率提供了可靠的技术途径。
To effectively address water channeling and enhance sweep efficiency in high-temperature and high-salinity fluvial sandstone reservoirs of Tahe Oilfield,a composite profile control system was constructed using gel particles optimized via the Kozeny-Carman equation and nitrogen foam with 0.5%foaming agent APF-1,with synergistic mechanisms analyzed through parallel sand-packed tube displacement experiments.Key findings reveal:①Through the dynamic deep profile control process(migration-blocking-re-migration-re-blocking),the gel particles present three modes:direct blocking,bridging blocking and adsorption retention.The efficiency of blocking high-permeability channels reaches 98.2%,and the profile control efficiency is 95.2%.This reduces the fluidity of high-permeability layers from 83%to 40.8%and increases the fluidity of low-permeability layers from 17%to 59.2%.The swept volume is significantly expanded macroscopically;②Nitrogen foam enhanced flow resistance via the Jamin effect,controlled mobility,and reduced interfacial tension,effectively mobilizing remaining oil in low-permeability zones and improving microscopic oil washing efficiency by 15.3%;③Composite driving increased recovery rate from 37.3%to 59.8%,a 22.5%enhancement,outperforming single gel particle profile control by 10.3%;④Field application across 3 cycles and 18 wells reduced comprehensive water cut from 76.9%to 60%,cumulative oil increment reached 2693 t,stage oil production index improved from 0.45 to 0.85 m^(3)/(MPa·d),with an operational effectiveness rate of 80%.Conclusions indicate that the“gel particles+nitrogen foam”composite technology,through multi-scale synergy of macroscopic sweep expansion and microscopic oil washing,effectively suppresses water channeling and optimizes seepage fields,demonstrating universality for high-temperature,high-salinity sandstone reservoirs and providing a reliable technical approach for enhanced oil recovery in mid-to-late development stages.
作者
任波
金发扬
REN Bo;JIN Fayang(The First Production Plant of Northwest Oilfield Branch,China Petroleum and Chemical Corporation,Luntai,Xinjiang 841600,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China)
出处
《世界石油工业》
2025年第6期132-139,共8页
World Petroleum Industry
基金
国家自然科学基金青年基金项目“致密油藏CO_(2)驱响应性微球体系构建及多级溶胀防窜机理研究”(52304043)。
关键词
河道砂油藏
水窜治理
氮气泡沫
冻胶颗粒
复合调驱技术
提高原油采收率
塔河油田
fluvial sandstone reservoir
water channeling control
nitrogen foam
gel particles
composite profile control technology
enhanced oil recovery
Tahe Oilfield
