| 沥青质沉积对原油渗流特征的影响 |
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| 引用本文： | 李新文,张国威.沥青质沉积对原油渗流特征的影响[J].地质科技通报,2021,40(6):15-23. |
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| 作者姓名： | 李新文 张国威 |
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| 基金项目： | 国家科技重大专项"鄂尔多斯盆地致密低渗油气藏注气提高采收率技术"2016ZX05048 |
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| 摘 要： | 沥青质沉积不仅会伤害储层物性还会对流体饱和度分布和渗流特征产生影响。通过开展不同开发方式下的长岩心驱替实验，分别测定了有或无沥青质沉积影响下的油水、油气和三相相对渗透率曲线，研究了沥青质沉积对原油相对渗透率和岩石润湿性的影响。研究结果表明，沥青质沉积导致水驱、CO2非混相驱和水气交替（WAG）驱的采收率分别降低了12.2%，5.9%，15.3%。并会引起驱替压差上升，岩石润湿性向亲油性转变，加速水或气突破时间。水驱中沥青质沉淀会使油水两相共渗区左移，含水饱和度对油相相对渗透率的影响增大。CO2非混相驱中沥青质沉淀对气相渗透率影响较小，而油相渗透率更容易受到含气饱和度变化的影响。在三相渗流中沥青质沉淀会降低油相渗透率，加快油相相对渗透率的下降速度，增大残余油饱和度，减弱WAG驱效果。在注入水中添加JCF-1非离子表面活性剂后，能够降低驱替压差，延缓水或气突破时间，增大油相相对渗透率，降低残余油饱和度，弥补沥青质沉积产生的伤害。研究成果为富含沥青质油藏的高效开发提供了依据。
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| 关 键 词： | 沥青质沉积 相对渗透率 润湿性 水气交替驱 驱替压差 |
| 收稿时间： | 2021-02-17 |
Influence of asphaltene deposition on oil seepage characteristics |
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| Abstract: | Asphaltene deposition not only damages reservoir physical properties, but also affects fluid saturation distribution and seepage characteristics.The oil-water, oil-gas and three-phase relative permeability curves with or without asphaltene deposition were measured by long core displacement experiments under different development modes, and the effects of asphaltene deposition on oil relative permeability and rock wettability were studied.The results show that the asphaltene deposition reduces the oil recovery by 12.2%, 5.9% and 15.3% for water flooding, CO2 immiscible flooding and water-altemating-gas WAG flooding, respectively.And it will cause the displacement pressure difference to rise, the wettability of rock to change to lipophilic, and accelerate the breakthrough time of water/gas.Asphaltene precipitation in water flooding will make the oil-water two-phase co permeability zone move to the left, and the influence of water saturation on oil phase relative permeability increases.In CO2 immiscible flooding, asphaltene precipitation has little effect on gas permeability, while oil permeability is more easily affected by the change of gas saturation.In three-phase flow, asphaltene precipitation can reduce oil permeability, accelerate the decline of oil relative permeability, increase residual oil saturation and weaken WAG flooding effect.After adding JCF-1 nonionic surfactant into the injected water, the displacement pressure difference can be reduced, the breakthrough time of water/gas can be delayed, the relative permeability of oil phase can be increased, the residual oil saturation can be reduced, and the damage caused by asphaltene deposition can be made up.The research results provide a basis for efficient development of asphaltene rich reservoirs. |
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