驱油用聚合物溶液的流变模型应用优化研究

doi:10.13809/j.cnki.cn32-1825/te.2022.04.016

Abstract

Abstract:

The progress of rheological testing methods has promoted the researchers' understanding of viscoelastic fluids in a wider testing range. The polymer solution used for oil displacement has the characteristics of “Three-stage” rheological curve （zero shear section, shear thinning section, and ultimate shear section）, so a more accurate description model and limiting conditions are extremely needed. Taking partially hydrolyzed polyacrylamide and hydrophobically associating polymer as the research objects, the rheological curves in a wide range （0.01 ~ 10 000 s^-1） have been analyzed, and the changes of viscoelastic modulus have been studied. The results show that under the experimental conditions, the rheological curves of the two polymers can be described by Carreau rheological model. The structural viscosity formed by hydrophobic association greatly enhances the elasticity of the solution, and makes the elastic modulus of the polymer P-P4 dominant. Considering the influence of elastic characteristics on the rheological curve, the relaxation time spectrum derived from the experimental data of small amplitude oscillation is used to limit the characteristic relaxation time（λ）. Finally, the experimental data are highly matched by the nonlinear regression fitting curve of Carreau rheological model. When studying the rheological constitutive equation of viscoelastic solution, it is necessary to fully consider the solution characteristics, establish the relationship between different test parameters, and establish reasonable limiting conditions, which are effective means to optimize and improve the rheological constitutive equation of viscoelastic fluid.

Key words: hydrophobically associating polymer, viscoelasticity, rheological property, constitutive equation, characteristic relaxation time

CLC Number:

TE357

ZHU Shijie,YE Zhongbin,SHI Leiting,SONG Rui,XU Jiangen,LIU Zhezhi. Application and optimization of rheological model of polymer solution for oil displacement[J].Petroleum Reservoir Evaluation and Development, 2022, 12(4): 677-683.

Figures/Tables 10

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References 24

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质量分数（%）		HPAM				AP-P4
质量分数（%）		公式		拟合精度		公式		拟合精度
0.10	G^*=0.115 2f ^{0.760 6}		R²=0.997 4		G^*=0.407 1f ^{0.388 6}		R²=0.999 1
0.14	G^*=0.229 8f ^{0.646 5}		R²=0.995 5		G^*=0.522 3f ^{0.241 8}		R²=0.997 2
0.20	G^*=0.395 6f ^{0.520 9}		R²=0.996 6		G^*=0.835 9f ^{0.235 5}		R²=0.994 5
0.25	G^*=0.645 9f ^{0.467 7}		R²=0.997 3		G^*=1.542 7f ^{0.209 2}		R²=0.996 1

类型	质量分数（%）	g（Pa）
类型	质量分数（%）	λ_i=0.01 s	λ_i=0.10 s	λ_i=1 s	λ_i=10 s	λ_i=100 s	λ_i=1 000 s
HPAM	0.10	5.12	0.18	0.10	0.01	5.90×10^-10	5.79×10^-10
	0.14	6.27	0.05	0.21	0.04	1.65×10^-9	1.62×10^-9
	0.20	3.21	0.89	0.28	0.13	4.83×10^-9	4.74×10^-9
	0.25	5.04	1.28	0.46	0.25	1.68×10^-9	1.65×10^-9
AP-P4	0.10	11.89	3.40×10^-7	0.15	0.21	5.49×10^-6	0.03
	0.14	1.46×10^-7	1.04	0.19	0.16	9.38×10^-8	0.20
	0.20	6.06	0.79	0.33	0.42	5.26×10^-6	0.17
	0.25	5.96	0.94	0.60	0.66	3.52×10^-6	0.49

聚合物类型	λ（s）
聚合物类型	质量分数0.10 %	质量分数0.14 %	质量分数0.20 %	质量分数0.25 %
HPAM	λ<0.01	λ<0.01	0.01<λ<0.10	0.01<λ<0.10
AP-P4	0.5<λ<1.0	0.5<λ<1.0	0.5<λ<1.0	0.5<λ<1.0

聚合物	质量分数（%）	μ₀（mPa·s）	μ_inf（mPa·s）	λ（s）	a	n
HPAM	0.10	852.9	4.4	0.002	0.155	-0.250
	0.20	2 499.0	4.8	0.005	0.176	-0.306
	0.25	7 542.9	5.3	0.008	0.152	-0.253
AP-P4	0.10	2 592.9	7.5	0.659	0.466	-0.102
	0.20	3 610.1	8.0	0.767	0.766	0.057
	0.25	4 180.1	9.2	0.906	1.226	0.146

Application and optimization of rheological model of polymer solution for oil displacement

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