纳米SiO<sub>2</sub>/HPAM/NaCl分散体系的稳定性、流变性及驱油性能研究

陈五花; 王业飞; 何臻培; 丁名臣

纳米SiO₂/HPAM/NaCl分散体系的稳定性、流变性及驱油性能研究

陈五花^{1, 2, ,},
王业飞^{1, 2},
何臻培^{1, 2},
丁名臣^{1, 2}

1.
中国石油大学(华东) 非常规油气开发教育部重点实验室, 山东青岛 266580
2.
中国石油大学(华东)石油工程学院山东省油田化学重点实验室, 山东青岛 266580

基金项目:

国家科技重大专项"大型油气田及煤层气开发" 2016ZX05058-003-003

详细信息

中图分类号: TE39
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- 文章访问数: 159
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- 被引次数: 0
出版历程
- 收稿日期: 2020-01-06
- 修回日期: 2020-04-06
- 网络出版日期: 2021-01-23
- 刊出日期: 2020-05-10

Stability, rheology and displacement performance of nano-SiO₂/HPAM/NaCl dispersion systems

CHEN Wu-hua^{1, 2
, ,},
WANG Ye-fei^{1, 2},
HE Zhen-pei^{1, 2},
DING Ming-chen^{1, 2}

1.
Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum(East China), Qingdao 266580, China
2.
Shandong Key Laboratory of Oilfield Chemistry, School of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, China

Funds:

the National Science and Technology Major Project of China 2016ZX05058-003-003

More Information

Corresponding author: CHEN Wu-hua, E-mail:cwh8157@163.com

摘要

摘要: 利用纳米粒度及Zeta电位分析仪、流变仪和悬滴法对纳米SiO₂/HPAM/NaCl体系60 ℃的稳定性、流变性及油水界面张力进行了研究。结果表明，HPAM的加入使SiO₂悬浮液的Zeta电位更负、粒径明显增加，静置10 d无明显浑浊现象。加入纳米SiO₂后，HPAM溶液的黏度增加，耐温、耐盐和耐剪切性能得到改善。对于质量分数为0.18%的HPAM溶液，SiO₂质量分数小于0.5%时，随SiO₂质量分数的增加，体系的黏度、储能模量和损耗模量增加，临界线性应变减小，蠕变回复能力增强；SiO₂质量分数大于0.5%时，出现了相反的现象；这是因为SiO₂质量分数不同时，HPAM在SiO₂表面的吸附量、吸附构型及两者之间形成的网状结构不同。纳米SiO₂的加入同时强化了HPAM降低油水界面张力的性能，加入质量分数为0.2%和0.5%的SiO₂后，HPAM的采收率分别提高了4.5%和6.0%。
- 纳米SiO₂ /
- HPAM /
- 黏弹性 /
- 稳定性 /
- 提高采收率
Abstract: The stability, rheological properties and oil/water interfacial tension of Nano-SiO₂/HPAM/NaCl systems at 60 ℃ were studied by Zetasizer, rheometer and spin-drop method, respectively. The results indicated that the zeta potential value of nano-SiO₂ became more negative and the particle size was significantly increased with addition of HPAM. Meanwhile, there was no obvious turbidity phenomenon after 10 d. The nano-SiO₂/HPAM suspensions had higher viscosity and the viscosity retention was improved in the presence of salt at high temperature and shear rate as compared to HPAM solution. In this work, the nano-SiO₂ threshold for 0.18%(mass ratio) HPAM solution was 0.5% (mass ratio). When the mass ratio of nano-SiO₂ was less than 0.5%, the viscosity, storage modulus, loss modulus and creeping recovery properties were enhanced as well as the critical strain was decreased with the increase of nano-SiO₂ mass fraction. However, the opposite phenomenon was investigated when the mass ratio of nano-SiO₂ was more than 0.5%. The reason for this result was that the polymer amounts, polymer conformation onto the nano-SiO₂ surface and the network structure between nano-SiO₂ and HPAM were different when the nano-SiO₂ mass fraction was different. Oil/water interfacial tension values of nano-SiO₂/HPAM suspensions were lower than that of HPAM solution, and thus with addition of 0.2% and 0.5% (mass ratio) nano-SiO₂, the nano-SiO₂/HPAM suspensions had ultimate oil recoveries of 4.5% and 6.0% higher than polymer flooding.
- nano-SiO₂ /
- HPAM /
- viscoelasticity /
- stability /
- enhanced oil recovery

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图 1 HPAM溶液和纳米SiO₂/HPAM体系的红外光谱谱图

Figure 1 FT-IR spectra for HPAM solution and nano-SiO₂/HPAM systems

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图 2 分散体系静置初始和10 d时的状态

Figure 2 Visual status of dispersion systems at initial stage and 10 d

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图 3 分散体系不同静置时间时的粒径

Figure 3 Particle size of dispersion systems at different time intervals

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图 4 不同条件下HPAM溶液及纳米SiO₂/HPAM体系的黏度

Figure 4 Viscosities of HPAM solution and nano-SiO₂/HPAM systems at different conditions

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图 5 HPAM溶液以及纳米SiO₂/HPAM体系的应变扫描实验

Figure 5 Strain sweep response for HPAM solution and nano-SiO₂/HPAM systems

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图 6 HPAM溶液以及纳米SiO₂/HPAM体系的频率扫描实验

Figure 6 Frequency sweep response for HPAM solution and nano-SiO₂/HPAM systems

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图 7 HPAM和纳米SiO₂之间的交联示意图

Figure 7 Bridging models between HPAM and nano-SiO₂

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图 8 HPAM溶液及纳米SiO₂/HPAM体系的蠕变回复实验

Figure 8 Creep and creep recovery experiments of HPAM solution and nano-SiO₂/HPAM dispersions

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图 9 纳米SiO₂对HPAM降低界面张力的影响

Figure 9 Effect of nano-SiO₂ on the interfacial tension reduction capacity of HPAM

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图 10 HPAM溶液以及纳米SiO₂/HPAM体系的驱替实验

Figure 10 Core flooding studies of HPAM solution and HPAM/nano-SiO₂ suspensions

I: water flooding; II: polymer flooding; III: water flooding

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表 1 分散体系不同静置时间的Zeta电位

Table 1 eta potentials of dispersion systems at different time intervals

w(SiO₂)/%	Zeta potential/mV
	HPAM+SiO₂		SiO₂
	initial	10 d	initial	10 d
0	-65.5	-52.3	-	-
0.2	-32.8	-29.2	-8.8	-7.9
0.5	-31.5	-27.9	-15.4	-12.9
1.0	-30.5	-26.6	-17.6	-14.8
1.5	-27.4	-24.9	-19.3	-16.9

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表 2 不同体系提高稠油采收率实验

Table 2 Experimental data of different systems for enhanced heavy oil recovery

Chemical formula	Viscosity/(mPa·s)	Permeability/10^-3μm²	Slug size/PV	Water flood recovery/%	Final recovery/%	Tertiary recovery/%
HPAM	41.5	1329.0	0.5	42.0	64.7	22.7
HPAM+0.2%SiO₂	51.0	1355.0	0.5	42.8	70.0	27.2
HPAM+0.5%SiO₂	53.1	1340.0	0.5	42.5	71.2	28.7

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