基于核磁共振信号标定法的致密油藏渗吸实验研究

doi:10.13809/j.cnki.cn32-1825/te.2024.03.010

Abstract

Abstract:

This study explores oil-water imbibition dynamics in rock samples of tight sandstone with similar physical properties using a novel NMR signal calibration method. This method can translate the total NMR signal output into oil volume via a regression model, offering enhanced convenience and accuracy compared to traditional approaches. The imbibition process is characterized by two distinct phases: a rapid imbibition stage and a stable imbibition stage. Optimal imbibition times were identified as approximately 68 hours for oil from coal samples and 188 hours for tight oil samples. When imbibition times are sufficient, the recovery ratios for oil from coal and tight oil are comparable. However, with insufficient imbibition time, the recovery ratio for oil from coal is lower than that for tight oil. Within the same stratigraphic layer, samples with identical viscosity exhibit similar imbibition dynamics, with tight oil samples reaching the stable stage more quickly than oil from coal samples. The pivotal radius distinguishing large and small pores is established at 0.5 μm. In low-viscosity crude oil samples, small pores significantly dominate the imbibition process, contributing 83.93% to the recovery, while large pores contribute only 16.07%. The overall mobilization of crude oil is low at 8.50%, frequently resulting in the formation of water locks. In contrast, tight oil samples show a more balanced contribution across all pore sizes during the soaking period. The average utilization ratios of crude oil are 14.82% in small pores and 29.82% in large pores.

Key words: oil-water imbibition, shut-in time, viscosity, fracture fluid, nuclear magnetic resonance（NMR）T₂ spectrum

CLC Number:

TE348

TANG Huiying, DI Kaixiang, ZHANG Liehui, GUO Jingjing, ZHANG Tao, TIAN Ye, ZHAO Yulong. Tight oil imbibition based on nuclear magnetic resonance signal calibration method[J].Petroleum Reservoir Evaluation and Development, 2024, 14(3): 402-413.

Figures/Tables 13

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岩心切分前编号	长度/ mm	直径/ mm	孔隙度/ %	渗透率/ （10^-3 μm²）	层位	岩心切分后编号	干重/ g	长度/ mm	直径/ mm	孔隙度/ %	渗透率/ （10^-3 μm²）
22	79.78	25.31	14.13	0.011 6	长6₃	22-1	42.173	37.55	25.31	15.26	0.23
22-2	44.314	39.31	25.31	13.67	0.20
49	72.50	25.17	13.86	0.223 0	长6₂	49-1	37.976	34.41	25.17	14.72	2.25
49-2	38.964	35.24	25.17	14.11	2.36
57	79.15	25.27	12.54	0.051 7	长6₁	57-1	42.371	37.26	25.27	13.28	0.08
57-2	43.473	37.86	25.27	11.87	0.06
58	78.80	25.27	7.90	0.020 2	长6₁	58-1	46.177	37.69	25.27	9.12	0.07
58-2	45.559	37.37	25.27	8.31	0.05
19	77.86	25.20	15.18	0.050 0	长6₃	19-1	41.545	37.63	25.20	14.37	0.20
19-2	40.953	37.30	25.20	15.66	0.28
17	78.73	25.22	16.36	0.108 0	长6₃	17-1	40.963	37.43	25.22	12.18	0.65
17-2	41.276	37.72	25.22	17.59	1.26
47	81.40	25.28	13.83	0.102 0	长6₃	47-1	44.536	39.58	25.28	14.16	0.29
47-2	45.798	38.44	25.28	14.67	0.19
50	70.92	25.26	15.14	0.354 0	长6₂	50-1	36.934	33.51	25.26	16.44	3.58
50-2	37.669	34.04	25.26	15.94	2.66

样品编号	含油体积/ mL	换油量/ mL	换油率/ %	渗吸稳定时间/ h
17-1	1.917	0.373	19.44	68
19-1	1.855	0.260	14.04	68
22-1	1.669	0.202	12.14	68
47-1	1.260	0.212	16.81	68
49-1	1.920	0.173	9.03	95
50-1	1.886	0.257	13.61	195
57-1	1.840	0.414	22.52	50
58-1	1.090	0.283	25.94	68
17-2	2.344	0.251	10.72	166
19-2	2.238	0.302	13.50	188
22-2	1.832	0.183	9.97	188
47-2	1.374	0.234	17.02	188
49-2	2.434	0.234	9.63	122
50-2	2.350	0.348	14.82	188
57-2	2.042	0.425	20.81	188
58-2	1.205	0.295	24.51	188

Tight oil imbibition based on nuclear magnetic resonance signal calibration method

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