基于核磁共振T2谱的致密砾岩储层纳米乳液-CO2吞吐孔喉尺度动用特征OA
Study on the pore-throat scale mobilization characteristics of nano emulsion-CO2 flooding in tight conglomerate reservoirs based on NMR T2 spectrum
针对致密砾岩储层孔喉结构复杂、微细孔隙中原油难以有效动用及常规吞吐开发效果递减快等问题,探究纳米乳液与超临界 CO2(SC-CO2)吞吐协同作用下多尺度孔喉中原油的动用特征.研究选取同一储层段致密砾岩岩心,结合高压压汞与核磁共振 T2 谱标定孔喉结构,开展衰竭开发、多轮纳米乳液与地层水吞吐对比实验,并在此基础上进行 SC-CO2 吞吐实验.通过连续监测全周期核磁共振 T2 谱变化,定量分析不同孔径区间＞10 μm的流体动用效率与采收率贡献.结果表明,衰竭开发阶段主要动用水力连通性好的中大孔隙(＞1 μm),微孔采收率低于 15%,总体采收率仅为 11%～12%;纳米乳液吞吐在 0.1～10 μm孔喉范围内的动用效率较地层水提高约 5%～25%,三轮吞吐后整体采收率达 53%;后续 SC-CO2 吞吐进一步强化全孔径动用,尤其在微孔与大孔中表现显著,三轮后整体动用效率接近 90%,较地层水前置吞吐提高约 14%.纳米乳液前置吞吐与 SC-CO2 后续吞吐具有较好的配合关系,能够促进残余油由大孔向微细孔喉进一步动用,整体采收率提高67%,说明该组合方式对提高致密砾岩储层微细孔隙原油动用程度具有积极作用.
To address the challenges associated with tight conglomerate reservoirs,including complex pore throat structures,poor mobilization of crude oil in micropores,and rapid production decline in conventional huff-and-puff development,this study investigates the synergistic effects of nano-emulsion and supercritical CO2(SC-CO2)huff-and-puff on oil mobilization in multi-scale pore throats.Tight conglomerate core samples from the same reservoir interval were selected.High-pressure mercury intrusion and nuclear magnetic resonance(NMR)T2 spectrum were combined to calibrate the pore-throat structures.Comparative experiments were then carried out,including depletion development,multiple cycles of nano-emulsion and formation water huff-and-puff,followed by SC-CO2 huff-and-puff.By continuously monitoring the changes in NMR T2 spectra throughout the entire cycle,the fluid mobilization efficiency and recovery contribution in different pore-size ranges>10μm were quantitatively analyzed.During the depletion stage,oil is mainly produced from medium-large pores(>1 μm)with sound hydraulic communication,while the recovery from micropores is lower than 15%,resulting in an overall recovery of 11%-12%only.Nano-emulsion huff-and-puff improves the mobilization efficiency in 0.1-10 μm pore-throat range by approximately 5%-25%compared with formation water,and the overall recovery reaches 53%after three cycles.Subsequent SC-CO2 huff-and-puff further enhances oil mobilization across all pore throat sizes,with particularly significant effects in micropores and large pores.After three cycles,the overall mobilization efficiency approaches 90%,which is about 14%higher than that of pre-treatment with formation-water.The results indicate that nano-emulsion pre-huff-and-puff combining with subsequent SC-CO2 huff-and-puff exhibits favorable compatibility,which promotes the further mobilization of residual oil from large pores to micropores,and increases the overall recovery by 67%.This combined approach therefore has positive implications for improving crude oil mobilization in the micropores of tight conglomerate reservoirs.
汤传意;田冷;李卫华;徐文熙;田辉;曲长友;祁壮壮;张旭
中国石油大学(北京)石油工程学院,北京 102249||中国石油大学(北京)气体能源开发与利用教育部工程研究中心,北京 102249||中国石油大学(北京)天然气地质与工程研究中心,北京 102249||新疆油田公司百口泉采油厂,新疆 克拉玛依 834000中国石油大学(北京)石油工程学院,北京 102249||中国石油大学(北京)气体能源开发与利用教育部工程研究中心,北京 102249||中国石油大学(北京)天然气地质与工程研究中心,北京 102249中国石油大学(北京)石油工程学院,北京 102249||中国石油大学(北京)气体能源开发与利用教育部工程研究中心,北京 102249||中国石油大学(北京)天然气地质与工程研究中心,北京 102249中国石油大学(北京)石油工程学院,北京 102249||中国石油大学(北京)气体能源开发与利用教育部工程研究中心,北京 102249||中国石油大学(北京)天然气地质与工程研究中心,北京 102249||北京九恒质信能源技术有限公司,北京 102249中国石油大学(北京)石油工程学院,北京 102249||中国石油大学(北京)气体能源开发与利用教育部工程研究中心,北京 102249||中国石油大学(北京)天然气地质与工程研究中心,北京 102249||新疆油田公司百口泉采油厂,新疆 克拉玛依 834000中国石油大学(北京)石油工程学院,北京 102249||中国石油大学(北京)气体能源开发与利用教育部工程研究中心,北京 102249||中国石油大学(北京)天然气地质与工程研究中心,北京 102249新疆油田公司百口泉采油厂,新疆 克拉玛依 834000新疆油田公司风城油田作业区,新疆 克拉玛依 834000
能源科技
致密砾岩储层纳米乳液吞吐超临界CO2吞吐核磁共振T2谱孔喉动用协同增效
tight conglomerate reservoirnanometer emulsion floodingsupercritical CO2 huff-n-puffNMR T2 spectrapore-throat mobilizationsynergistic enhancement
《石油钻采工艺》 2026 (3)
333-342,10
国家科技重大专项"CO2促混转混综合调控技术研究"(编号:2024ZD1406601).
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