纳米颗粒对活油中沥青质分散潜力探讨

展转盈; 倪军

doi:10.19509/j.cnki.dzkq.tb20220226

纳米颗粒对活油中沥青质分散潜力探讨

doi: 10.19509/j.cnki.dzkq.tb20220226

展转盈^1,,
倪军^2, ,

1.
西安石油大学化学化工学院, 西安 710065
2.
陕西延长石油(集团)有限责任公司研究院, 西安 710075

基金项目:

国家重点研发计划"CO₂驱油技术及地质封存安全监测" 2018YFB0605500

详细信息

作者简介:
展转盈(1979—), 女, 副教授, 主要从事油气田提高采收率技术的研究工作。E-mail: 51698469@qq.com

通讯作者:
倪军(1981—), 男, 教授级高级工程师, 主要从事油气田开发方面的研究工作。E-mail: njunycyt2010@163.com

中图分类号: TE357
计量
- 文章访问数: 373
- PDF下载量: 22
- 被引次数: 0
出版历程
- 收稿日期: 2022-05-19
- 录用日期: 2022-09-14
- 修回日期: 2022-09-11

Dispersion potential of asphaltene in live oil by nanoparticles

Zhan Zhuanying^1
,,
Ni Jun^{2
, ,}

1.
College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an 710065, China
2.
Research Institute of Shaanxi Yanchang Petroleum(Group) Co., Ltd., Xi'an 710075, China

摘要

摘要:
为明确纳米颗粒在高温高压下抑制地层活油中沥青质沉淀的效果及机理, 通过开展高温高压固相颗粒检测实验, 分别采用激光探测、高压显微镜和高温高压过滤等方法, 研究了纳米颗粒二氧化硅(SiO₂)(改性)和四氧化三钴(Co₃O₄)作用下地层活油中沥青质的聚集和沉淀特征, 结合电镜扫描和热重分析实验, 揭示了纳米颗粒抑制沥青质沉淀机理。实验结果表明, 目标储层地层原油中添加SiO₂纳米颗粒后, 沥青质沉淀起始压力(AOP)由原来的59.2 MPa下降至53.4 MPa, 衰竭至35 MPa压力下, 沥青质颗粒的平均粒径由8.82 μm减小至5.53 μm, 沉淀量占比由66.4%降至46.4%。而添加Co₃O₄纳米颗粒后, 在泡点压力之上未出现明显沥青质沉淀, 35 MPa压力下沥青质颗粒平均粒径仅为1.65 μm, 沉淀量占比仅为13.6%。纳米颗粒能够抑制沥青质分子的析出、减缓沥青质颗粒的聚集速度、降低AOP及沥青质的沉淀量。与SiO₂纳米颗粒相比, Co₃O₄纳米颗粒具有更高的沥青质吸附亲和力, 抑制效果更好。研究成果为防治沥青质沉积及改善沉积伤害提供了依据。
- 纳米颗粒 /
- 沥青质分子 /
- 沉淀 /
- 吸附 /
- 起始压力
Abstract: Objective
In order to clarify the effect and mechanism of nanoparticles on inhibiting asphaltene precipitation in formation live oil formation under high temperature and high pressure.
Methods
In this study, by carrying out high-temperature and high-pressure solid particle detection experiment, the aggregation and precipitation characteristics of asphaltene in formation live oil under the action of SiO₂ and Co₃O₄ nanoparticles were studied by means of laser detection, high-pressure microscopy and high-temperature and high-pressure filtration. Combined with the electron microscope scanning and thermogravimetric analysis experiments, the mechanism of nanoparticles inhibiting asphaltene precipitation was revealed.
Results
The results show that the initial pressure of asphaltene precipitation (AOP) decreases from 59.2 MPa to 53.4 MPa after adding SiO₂ nanoparticles to the crude oil of the target reservoir.When the pressure was reduced to 35 MPa, the average particle size of asphaltene particles decreases from 8.82 μm to 5.53 μm, and the proportion of precipitation decreased from 66.4% to 46.4%. After adding Co₃O₄ nanoparticles, there is no obvious asphaltene precipitation above the bubble point pressure.The average particle size of asphaltene particles is only 1.65 μm under 35 MPa pressure, and the proportion of precipitation is only 13.6%. Nanoparticles can inhibit the precipitation of asphaltene molecules, slow down the aggregation rate of asphaltene particles, and reduce AOP and precipitation. Compared with SiO₂, Co₃O₄ nanoparticles have higher asphaltene adsorption affinity and better inhibition effect.
Conclusion
The research results provide a basis for preventing asphaltene deposition and improving deposition damage.
- nanoparticle /
- asphaltene molecule /
- precipitation /
- adsorbent /
- initial pressure
注释:

(所有作者声明不存在利益冲突)

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图 1 固相颗粒检测系统原理简图

Figure 1. Schematic diagram of the solid particle detection system

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图 2 纳米颗粒氮气吸附和解吸等温线及孔径分布

Figure 2. Nitrogen adsorption and desorption isotherms and pore size distribution of nanoparticles

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图 3 原油透光率随压力的变化曲线

a.纯地层原油；b.添加SiO₂纳米颗粒的地层原油；c.添加Co₃O₄纳米颗粒的地层原油。P_b.泡点压力

Figure 3. Variation curve of crude oil transmittance with pressure

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图 4 高压显微镜下原油中沥青质颗粒随压力的变化

Figure 4. Changes of asphaltene particles in crude oil with pressure under high-pressure microscope

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图 5 35 MPa压力下原油中沥青质颗粒粒径分布对比

Figure 5. Comparison of particle size distribution of asphaltene particles in crude oil under 35 MPa pressure

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图 6 原油中沥青质沉淀量随压力的变化

Figure 6. Variation of asphaltene precipitation in crude oil with pressure

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图 7 纳米颗粒及沥青质颗粒的微观表面特征

a.Co₃O₄纳米颗粒；b.SiO₂纳米颗粒；c.纯沥青质颗粒；d.纳米颗粒吸附沥青质后；e.SiO₂纳米颗粒表面上吸附的沥青质颗粒；f.Co₃O₄纳米颗粒表面上吸附的沥青质颗粒

Figure 7. Micro surface characteristics of nanoparticles and asphaltene particles

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图 8 纯沥青质和吸附在Co₃O₄和SiO₂表面的沥青质燃烧后剩余质量变化

Figure 8. Residual mass changes of pure asphaltene and asphaltene adsorbed on the surface of Co₃O₄ and SiO₂ after combustion

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表 1 地层原油基本高压物性参数

Table 1. Basic high-pressure physical parameters of the formation crude oil

参数类型	数值
地层原油组分C₁~C₇ x_B/%	75.83
地层原油组分C₈~C₁₂x_B/%	15.18
地层原油组分C₁₂₊x_B/%	6.22
地层原油相对分子质量/(g·mol^-1)	78
脱气原油相对分子质量/(g·mol^-1)	224
泡点压力/MPa	30.6
溶解气油比/(m³·m^-3)	275.4
地层原油密度/(g·cm^-3)(71.6 MPa，128.7℃)	0.731 6
地层原油黏度/(mPa·s)(71.6 MPa，128.7℃)	2.78
原油中饱和烃x_B/%	65.5
原油中芳香烃x_B/%	23.3
原油中胶质x_B/%	8.7
原油中沥青质x_B/%	2.5
胶体不稳定指数	2.12

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表 2 纳米颗粒的孔隙结构参数

Table 2. Pore structure parameters of nanoparticles

纳米颗粒类型	BJH模型		BET模型			平均纳米颗粒粒径/nm
纳米颗粒类型	孔隙体积/(10^-3mL·g^-1)	平均孔径/nm	孔隙体积/(10^-3mL·g^-1)	平均孔径/nm	比表面积/(m²·g^-1)	平均纳米颗粒粒径/nm
SiO₂	395.4	18.85	402.6	19.06	75.82	28.69
Co₃O₄	133.2	20.28	131.8	24.16	21.35	47.62

下载: 导出CSV

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