三元复合体系在多孔介质运移过程中变化规律研究

Abstract

Abstract:

In order to further explore the migration rule of alkali/surfactant/polymer（A/S/P） system in the reservoir, guided by the reservoir engineering, surfactant chemistry and oilfield chemistry, and aimed at the fluid properties and geological characteristics, we conducted the research on change rule of viscosity, IFT tension and displacement effect of A/S/P system, and discussed the relative mechanism based on the dynamic testing result of single component concentration of compound system. The results showed that during the displacement process of A/S/P system, the polymer, surfactant and alkali presented different along-range retention characteristics, the chromatographic separation phenomenon occurred, the decrease rate of surfactant concentration was much higher than that of polymer and alkali, and both the ultra-low interfacial tension and high viscosity could only keep the length of 1/3 well distance. The contribution rate of ultra low tension was limited in the A/S/P flooding; about 60 % oil was not recovered by compound system under the condition of ultra low tension. If the A/S/P system can keep lower IFT and give consideration to proper viscosity, we can acquire the better displacement effect.

Key words: alkali/surfactant/polymer（A/S/P） compound flooding, component concentration, viscosity, interfacial tension, displacement effect

CLC Number:

TE357

Wang Yuanyuan,Song Kaopin,Liu Jian,Shen Qiuyu,Zhou Jilong,Yu Tao. Study on migration change rule of alkali/surfactant/polymer system in porous media[J].Reservoir Evaluation and Development, 2018, 8(6): 51-56.

Figures/Tables 12

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References 14

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取样次序	连续注聚时间/min	折合注聚孔隙体积倍数（PV数）	折算三元体系理论前缘位置/m
1	7 920	0.579	17.37
2	9 360	0.685	20.55
3	10 800	0.790	23.7
4	12 240	0.895	26.85
5	13 670	1	29.36

距离/m	浓度保留率C/C₀,f
距离/m	聚合物					表面活性剂					碱浓度
0.44	0.99	0.99	0.99	1	1	0.5	0.57	0.67	0.73	0.8	0.98	0.98	0.99	0.99	1
1.28	0.92	0.98	0.98	0.99	1	0.47	0.57	0.63	0.7	0.73	0.92	0.96	0.98	0.98	0.99
2.99	0.89	0.95	0.97	0.98	0.99	0.33	0.43	0.53	0.63	0.67	0.86	0.93	0.93	0.98	0.97
5.54	0.84	0.88	0.89	0.92	0.93	0.23	0.3	0.4	0.43	0.5	0.82	0.88	0.86	0.92	0.92
6.38	0.8	0.86	0.87	0.89	0.91	0.13	0.27	0.33	0.37	0.37	0.78	0.83	0.85	0.88	0.9
10.64	0.61	0.78	0.79	0.83	0.85	0.03	0.13	0.17	0.2	0.3	0.59	0.69	0.78	0.81	0.85
12.28	0.55	0.66	0.73	0.77	0.79	0.03	0.07	0.13	0.17	0.13	0.48	0.69	0.72	0.77	0.79
15.74	0.42	0.59	0.66	0.72	0.75	0	0.03	0.07	0.1	0.1	0.4	0.58	0.67	0.73	0.75
20.01	0.17	0.44	0.53	0.61	0.68	0	0	0.03	0.03	0.07	0.25	0.5	0.57	0.67	0.71
21.68	0	0.25	0.42	0.48	0.65	0	0	0	0.03	0.03	0	0.29	0.5	0.54	0.67
26.81	0	0	0.29	0.32	0.6	0	0	0	0	0.03	0	0	0.38	0.42	0.63
29.36	0	0	0	0.22	0.53	0	0	0	0	0	0	0	0	0.38	0.57

序号	距入口距离/m	界面张力/（mN·m^-1）	注ASP期间累计采出程度,%	对应界面张力不同数量级的增值
1	0.44	0.006 470	0	10^-3mN/m：11.23 %
2	1.28	0.006 450	0.05
3	2.99	0.006 170	0.52
4	5.54	0.006 310	2.32
5	6.38	0.006 460	3.56
6	10.64	0.008 510	11.23
7	12.28	0.011 220	13.8	10^-2mN/m：9.84 %
8	15.74	0.048 978	21.07	10^-2mN/m：9.84 %
9	20.01	0.602 560	25	10^-1mN/m：3.93 %
10	21.68	1.202 264	26.19	10⁰mN/m：3.71 %
11	26.81	1.659 587	28.34
12	29.36	2.691 535	28.71

Study on migration change rule of alkali/surfactant/polymer system in porous media

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