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Supercritical CO2 Foam Stabilized by a Viscoelastic Surfactant in Fractured Porous Media: The Effect of Fracture Surface Roughness
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-06-03 , DOI: 10.1021/acs.energyfuels.1c00281
Ying Yu 1 , Soheil Saraji 1
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-06-03 , DOI: 10.1021/acs.energyfuels.1c00281
Ying Yu 1 , Soheil Saraji 1
Affiliation
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Foam flooding has been used for gas conformance control during enhanced oil recovery (EOR) in heterogeneous reservoirs. The application of foam flooding in naturally or hydraulically fractured reservoirs has recently been gaining attention. There are, however, limited studies on supercritical CO2 (scCO2) foam behavior in the fractured system. Specifically, the impact of fracture properties such as aperture size, surface roughness, and fracture orientation in natural rocks are not well studied. In this work, we investigated the behavior of scCO2 foam stabilized by a viscoelastic surfactant in fractured systems. The apparent viscosity of foam in fractured and nonfractured cores was compared. Furthermore, the effects of fracture surface roughness and crude oil on foam behavior were determined. We found that the fracture surface roughness positively affects the apparent viscosity of foam in the absence and presence of crude oil. Also, the formation of the complex structure of the water-oil-CO2 system during oil–foam co-injection may serve a major role in causing a significant apparent viscosity.
中文翻译:
裂缝多孔介质中粘弹性表面活性剂稳定的超临界 CO 2泡沫:裂缝表面粗糙度的影响
泡沫驱已被用于在非均质油藏中提高石油采收率 (EOR) 期间的气体一致性控制。泡沫驱在天然或水力压裂油藏中的应用最近受到关注。然而,对压裂系统中超临界 CO 2 (scCO 2 ) 泡沫行为的研究有限。具体而言,天然岩石中的裂缝特性(例如孔径大小、表面粗糙度和裂缝方向)的影响尚未得到很好的研究。在这项工作中,我们研究了 scCO 2的行为在裂缝系统中由粘弹性表面活性剂稳定的泡沫。比较了破裂和未破裂岩心中泡沫的表观粘度。此外,还确定了裂缝表面粗糙度和原油对泡沫行为的影响。我们发现,在不存在和存在原油的情况下,裂缝表面粗糙度对泡沫的表观粘度产生积极影响。此外,油-泡沫共注入过程中水-油-CO 2系统复杂结构的形成可能在导致显着的表观粘度中起主要作用。
更新日期:2021-06-17
中文翻译:
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裂缝多孔介质中粘弹性表面活性剂稳定的超临界 CO 2泡沫:裂缝表面粗糙度的影响
泡沫驱已被用于在非均质油藏中提高石油采收率 (EOR) 期间的气体一致性控制。泡沫驱在天然或水力压裂油藏中的应用最近受到关注。然而,对压裂系统中超临界 CO 2 (scCO 2 ) 泡沫行为的研究有限。具体而言,天然岩石中的裂缝特性(例如孔径大小、表面粗糙度和裂缝方向)的影响尚未得到很好的研究。在这项工作中,我们研究了 scCO 2的行为在裂缝系统中由粘弹性表面活性剂稳定的泡沫。比较了破裂和未破裂岩心中泡沫的表观粘度。此外,还确定了裂缝表面粗糙度和原油对泡沫行为的影响。我们发现,在不存在和存在原油的情况下,裂缝表面粗糙度对泡沫的表观粘度产生积极影响。此外,油-泡沫共注入过程中水-油-CO 2系统复杂结构的形成可能在导致显着的表观粘度中起主要作用。