Influencing Factors of Microscopic Oil Displacement Efficiency by Polymer Flooding in Class II Reservoirs

doi:10.12422/j.issn.1006-396X.2023.02.005

Abstract

Abstract:

Class II?B reservoirs have become the main exploitation target in Daqing Oilfield, and their geological reserves account for 45.8% of the Class II reservoirs.In view of the huge difference in the exploitation of Class II?B reservoirs,a two?phase mathematical model of viscoelastic polymer solution and crude oil was built,and the logarithmic conformation method was used to transform the model.The VOF method was employed to track the two?phase interface in the displacement process,and thus a two?phase numerical model of viscoelastic polymer solution and crude oil was obtained.Moreover,the effects of pore structure and viscoelasticity of polymer on microscopic oil displacement efficiency were studied by the microscopic model of Class II reservoirs. The results demonstrate that higher reservoir heterogeneity is accompanied by lower microscopic oil displacement efficiency,and the oil displacement efficiency of Class II?A reservoirs with better pore parameters is 2.10% higher than that of Class II?B reservoirs.With the increase in viscosity,the microscopic oil displacement efficiency increases,and the oil displacement efficiency of schemes with a viscosity ratio of (viscosity ratio of polymer to crude oil) 1.5 $∶$ 1,2.0 $∶$ 1 and 10.0 $∶$ 1 is 0.59%,0.80% and 4.10% higher,respectively, than that with a viscosity ratio of 1.0 $∶$ 1. With the increase in elasticity, the microscopic oil displacement efficiency rises, but when the elasticity is higher than 13 s,the microscopic oil displacement efficiency decreases slightly,which indicates that the elasticity of polymer solution has an optimal value for improving oil displacement efficiency.The research results provide important theoretical support for the polymer flooding development of Class II?B reservoirs in Daqing oilfield.

Key words: Class II reservoirs, Polymer flooding, Pore structure, Viscoelastic, Displacement efficiency

摘要：

二类B油层目前已经成为大庆油田的主要开采对象，其地质储量占二类油层的45.8%。针对二类B油层开采差异较大的现象，建立了黏弹性聚合物?原油两相数学模型，并采用对数构象法进行变换；利用VOF法追踪聚驱过程中的两相界面，得到了黏弹性聚合物?原油两相流的数值模型；通过二类油层微观模型研究孔隙结构和聚合物黏弹性对微观驱油效率的影响。结果表明，储层非均质性越强，微观驱油效率越低，孔隙参数较好的二类A油层的驱油效率高于二类B油层2.10%；随着黏度的增加，微观驱油效率增大，黏度比（聚合物与原油的黏度比）为1.5 $∶$ 1、2.0 $∶$ 1和10.0 $∶$ 1的方案驱油效率比黏度比为1.0 $∶$ 1的方案高0.59%、0.80%和4.10%；随着弹性的增加，微观驱油效率增大，但当松弛时间大于13 s后，微观驱油效率略有降低，说明聚合物的弹性对驱油效率的贡献存在最优值。研究结果为大庆油田二类B油层聚驱开发提供了重要的理论支撑。

关键词: 二类油层, 聚合物驱, 孔隙结构, 黏弹性, 驱油效率

CLC Number:

TE343

Yuanyuan He, Huiying Zhong, Songlin Guo, Tingbao Yang. Influencing Factors of Microscopic Oil Displacement Efficiency by Polymer Flooding in Class II Reservoirs[J]. Journal of Petrochemical Universities, 2023, 36(2): 34-41.

何源媛, 钟会影, 郭松林, 杨庭宝. 二类油层聚驱微观驱油效率影响因素研究[J]. 石油化工高等学校学报, 2023, 36(2): 34-41.

Figures/Tables 11

Table 1 Pore structure parameter of reservoir

油层名称	渗透率/mD	孔喉比	配位数	分选系数	平均孔隙半径/μm	平均喉道半径/μm
二类A	1 693.50	8.93	1.46	3.11	442.30	14.63
二类B	494.75	8.34	1.27	4.21	60.66	9.41

Fig.1 Microscopic model grid division diagram of Class II reservoirs

Fig.2 The change curve of inlet and outlet pressure difference with injection pore volume multiple

Table 2 Physical properties of polymer solution and crude oil

参数	数值
参数	原油	聚合物
密度/(kg $⋅$ m^-3)	860	960
黏度/(mPa∙s)	10	10
松弛时间/s	0	10
界面张力/(mN $⋅$ m^-1)	4.8	4.8

Table 2 Physical properties of polymer solution and crude oil

参数	数值
参数	原油	聚合物
密度/(kg $⋅$ m^-3)	860	960
黏度/(mPa∙s)	10	10
松弛时间/s	0	10
界面张力/(mN $⋅$ m^-1)	4.8	4.8

Fig.3 The saturation distribution of the micro?model of the second class A reservoir and the second class B reservoir

Fig.4 The pore saturation distribution of polymer with different viscosity

Fig.5 Pore saturation distribution corresponding to the different pressure difference

Fig.6 The change curve of inlet and outlet pressure difference with injection pore volume multiples under different polymer solution viscosity

Fig.7 The saturation distribution with different relaxation time

Fig.8 The change curve of microscopic displacement efficiency with relaxation time

Fig.9 The change of velocity with the multiple of injected pore volume at different relaxation time

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