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

油气藏评价与开发 ›› 2024, Vol. 14 ›› Issue (3): 402-413.doi: 10.13809/j.cnki.cn32-1825/te.2024.03.010

基于核磁共振信号标定法的致密油藏渗吸实验研究

唐慧莹(),第凯翔(),张烈辉,郭晶晶,张涛,田野,赵玉龙

西南石油大学油气藏地质及开发工程全国重点实验室，四川成都 610500

收稿日期:2023-10-30 出版日期:2024-06-26 发布日期:2024-07-10
通讯作者: 第凯翔（1992—），男，在读博士研究生，主要从事非常规储层非线性有效应力及多尺度孔隙结构描述相关研究。地址：四川省成都市新都区新都大道8号西南石油大学，邮政编码：610500。E-mail: 1029175156@qq.com
作者简介:唐慧莹（1990—），女，博士，副教授，主要从事非常规储层压裂及一体化数值模拟研究。地址：四川省成都市新都区新都大道8号西南石油大学，邮政编码：610500。E-mail: tanghuiying@swpu.edu.cn
基金资助:
国家自然科学基金面上项目“井-射孔-缝协同密切割压裂三维非平面缝网竞争扩展机制研究”(52374043);国家自然科学基金重点项目“海相页岩水平井超临界二氧化碳压裂机理与一体化模拟研究”(52234003);国家自然科学基金青年基金“致密油藏基于化学势的多组分、多机理耦合扩散数值模拟方法研究”(52304048)

Tight oil imbibition based on nuclear magnetic resonance signal calibration method

TANG Huiying(),DI Kaixiang(),ZHANG Liehui,GUO Jingjing,ZHANG Tao,TIAN Ye,ZHAO Yulong

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2023-10-30 Online:2024-06-26 Published:2024-07-10

摘要/Abstract

摘要：

基于一种新的核磁共振信号标定法开展了致密砂岩岩样的油水渗吸实验，该方法可以根据回归模型将核磁信号总量换算为含油体积，相较常规方法计算更方便、更准确。研究发现渗吸过程可划分为过渡渗吸和稳定渗吸2个阶段，低黏度煤油渗吸样品最佳渗吸时间集中在68 h左右，高黏度致密油渗吸样品最佳渗吸时间集中在188 h左右。渗吸时间充足的情况下，煤油和致密油的最终换油率相差不大，但如果渗吸时间较短，则黏度越大换油率越低。同层位、同黏度的样品具有相似的渗吸动态特征；同层位、高黏油的样品达到稳定渗吸阶段无因次渗吸时间相较低黏油更短。以半径0.5 μm作为大、小孔隙的分界线，煤油渗吸样品中半径小于0.5 μm的孔隙渗吸换油贡献率平均为83.93%，占据主导地位，原油动用率平均为23.54%；半径大于0.5 μm的孔隙渗吸换油贡献率平均为16.07%，相对较少，原油的动用率平均为8.50%，普遍较低，容易形成水锁。致密油渗吸样品在所有孔隙中的渗吸换油贡献率则相对均衡，半径小于0.5 μm的孔隙原油动用率平均为14.82%，相对较低；而半径大于0.5 μm的孔隙原油动用率平均为29.82%，在焖井过程中普遍会得到有效动用。

关键词: 油水渗吸, 焖井时间, 黏度, 压裂液, 核磁共振T₂谱

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

中图分类号:

TE348

唐慧莹, 第凯翔, 张烈辉, 郭晶晶, 张涛, 田野, 赵玉龙. 基于核磁共振信号标定法的致密油藏渗吸实验研究[J]. 油气藏评价与开发, 2024, 14(3): 402-413.

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.

图/表 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

基于核磁共振信号标定法的致密油藏渗吸实验研究

Tight oil imbibition based on nuclear magnetic resonance signal calibration method

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