沥青质沉积对原油渗流特征的影响

李新文; 张国威

doi:10.19509/j.cnki.dzkq.2021.0602

沥青质沉积对原油渗流特征的影响

doi: 10.19509/j.cnki.dzkq.2021.0602

李新文^1,,
张国威^2, ,

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

详细信息

作者简介:
李新文(1969-), 男, 高级工程师, 主要从事低渗至特低渗透油藏经济有效开发等方面的研究工作。E-mail: 2817434472@qq.com

通讯作者:
张国威(1982-), 男, 讲师, 主要从事油气田优化开发和数值模拟教学与研究工作。E-mail: 290439024@qq.com

中图分类号: TE14
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出版历程
- 收稿日期: 2021-02-17

Influence of asphaltene deposition on oil seepage characteristics

Li Xinwen^1
,,
Zhang Guowei^{2
, ,}

摘要

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。
- 沥青质沉积 /
- 相对渗透率 /
- 润湿性 /
- 水气交替驱 /
- 驱替压差
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.
- asphaltene deposition /
- relative permeability /
- wettability /
- water gas alternate flooding /
- displacement pressure difference

HTML全文

图 1 沥青质沉积对水驱压差和采收率的影响

Figure 1. Effect of asphaltene deposition on water drive pressure difference and oil recovery

下载: 全尺寸图片幻灯片

图 2 沥青质沉积对注CO₂驱替压差和采收率的影响

Figure 2. Effect of asphaltene deposition on CO₂ drive pressure difference and oil recovery

下载: 全尺寸图片幻灯片

图 3 沥青质沉积对水气交替驱替压差的影响

Figure 3. Effect of asphaltene deposition on WAG flooding pressure difference and oil recovery

下载: 全尺寸图片幻灯片

图 4 水驱过程中沥青质沉淀对油水相对渗透率曲线的影响

Figure 4. Effect of asphaltene precipitation on oil-water relative permeability curve during water flooding

下载: 全尺寸图片幻灯片

图 5 CO₂驱过程中沥青质沉淀对油气相对渗透率曲线的影响

Figure 5. Effect of asphaltene precipitation on oil-water relative permeability curve during CO₂ flooding

下载: 全尺寸图片幻灯片

图 6 WAG驱过程中沥青质沉淀对油相相对渗透率的影响

Figure 6. Effect of asphaltene precipitation on oil-water relative permeability curve during WAG flooding

下载: 全尺寸图片幻灯片

图 7 3^#岩心润湿接触角的变化

a.原始状态下的接触角33.5°；b.地层水-CO₂交替驱含沥青质地层原油后的接触角108.7°；c.0.3% JCF-1溶液-CO₂交替驱含沥青质地层原油后的接触角49.3°

Figure 7. Variation of wetting contact angle of core 3^#

下载: 全尺寸图片幻灯片

图 8 2^#岩心CO₂驱沥青质沉积后SEM图及红框处矿物能谱元素分析

Figure 8. SEM and EDS analysis of core 2^# after asphaltene deposition

下载: 全尺寸图片幻灯片

图 9 3^#岩心地层水-CO₂交替驱沥青质沉积后SEM图及红框处矿物能谱元素分析

Figure 9. SEM and EDS analysis of core 3^# after formation water-CO₂ asphaltene deposition

下载: 全尺寸图片幻灯片

表 1 实验岩心基本物性及实验类型

Table 1. Basic physical properties experimental types of experimental cores

长岩心编号	长度/cm	直径/cm	孔隙度/%	气测渗透率/10^-3μm²	孔隙体积/cm³	润湿接触角/(°)	w_B/%					实验类型
长岩心编号	长度/cm	直径/cm	孔隙度/%	气测渗透率/10^-3μm²	孔隙体积/cm³	润湿接触角/(°)	石英	长石	方解石	白云石	黏土	实验类型
1	15.21	2.52	20.18	208.25	34.72	38.2	52	28	2	8	10	①注地层水驱不含沥青质原油；②注地层水驱含沥青质原油；③注0.3% JCF-1溶液驱替含沥青质原油
2	15.16	2.51	21.36	240.45	36.24	37.3	54	25	1	7	13	①注CO₂驱不含沥青质原油；②注CO₂驱含沥青质原油
3	15.08	2.52	20.84	226.11	33.68	33.5	59	21	2	7	11	①地层水-CO₂交替驱不含沥青质原油；②地层水-CO₂交替驱含沥青质原油；③0.3% JCF-1溶液-CO₂交替驱含沥青质原油

下载: 导出CSV

表 2 复配原油基础物性参数

Table 2. Basic physical properties of compound crude oil

参数类型	地层原油 (含沥青质)	地层原油 (去除沥青质)
溶解气油比/(m³·m^-3)	37.25	41.36
泡点压力/MPa	6.54	6.86
脱气原油密度/(g·cm^-3)	0.841 1	0.839 5
地层原油密度/(g·cm^-3)	0.762 6	0.756 1
地层原油黏度/(mPa·s^-1)	5.72	5.48
地层原油体积系数	1.1932	1.1985
地层原油平均相对分子量	102.5	96.4
w(沥青质)/%	3.64	0.78
地层原油储层条件: 15.8 MPa, 61℃; 脱气原油储层条件: 0.1 MPa, 24℃

下载: 导出CSV

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