聚驱相对渗透率曲线变化规律实验研究

Abstract

Abstract:

The relative permeability curves of polymer flooding are important bases for the development index predicting the polymer flooding oilfield. Aiming at the low numerical simulation accuracy caused by the lack of the relative permeability of the polymer flooding in the offshore L oilfield, we determined the relative permeability curves of the polymer flooding by the non-steady-state method to compare the relative permeability of different core permeability and polymer concentration. The variation law of relative permeability curve of the polymer flooding was summarized as well. The experimental results showed that the permeability curves of the polymer flooding increased with the core permeability, the relative permeability of the oil phase decreased with the same water saturation, and the residual oil saturation also decreased. With the increase of the polymer concentration, the oil relative permeability of the same water saturation increased, but the residual oil saturation decreased. In the early stage of polymer flooding, the residual oil saturation decreased rapidly, while in the middle and late stages, the residual oil saturation decreased slowly. The research results provided guidance and basis for fine numerical simulation and development planning in offshore polymer flooding fields.

Key words: polymer flooding, relative permeability, experiment, polymer concentration, permeability determination

CLC Number:

TE343

Cheng Dayong,Li Yanlai,Fang Na,Zheng Hua,Zhu Zhiqiang. Experimental study on variation law of relative permeability curves of polymer flooding[J].Reservoir Evaluation and Development, 2019, 9(2): 56-59.

Figures/Tables 8

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References 11

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岩心编号	长度/ cm	直径/ cm	孔隙度, %	气测渗透率/ 10^-3μm²	聚合物溶液浓度/ （mg·L^-1）
Ⅰ-1	4.92	2.61	40.7	3 511	2 250
Ⅰ-2	4.93	2.60	46.1	3 801	0
Ⅰ-3	4.50	2.55	45.5	3 706	1 750
Ⅱ-1	5.71	2.56	41.1	1 662	1 750
Ⅲ-1	5.15	2.60	40.0	605	1 750

岩心编号	气测渗透率/ （10^-3μm²）	聚合物溶液浓度/ （mg·L^-1）	残余油饱和度,%		水相相对渗透率, f
岩心编号	气测渗透率/ （10^-3μm²）	聚合物溶液浓度/ （mg·L^-1）	聚驱30 PV	聚驱60 PV	聚驱30 PV	聚驱60 PV
Ⅰ-3	3 706	1 750	23.47	23.44	0.081	0.080
Ⅰ-1	3 511	2 250	22.00	21.93	0.077	0.076

相渗曲线选用类别	拟合参数	拟合井数/ 口	拟合相对误差<5 %
相渗曲线选用类别	拟合参数	拟合井数/ 口	井数	百分比
水驱相渗曲线	地层压力	23	16	69.6
水驱相渗曲线	含水率	34	24	70.6
聚驱相渗曲线	地层压力	23	20	87.0
聚驱相渗曲线	含水率	34	29	85.3

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Experimental study on variation law of relative permeability curves of polymer flooding

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