页岩油储层压裂液渗吸驱油机理研究

doi:10.13809/j.cnki.cn32-1825/te.2024.05.011

摘要/Abstract

摘要：

压裂液渗吸驱油是当前页岩油储层提高采收率的重要技术手段。通过评价压裂液润湿改性处理剂对渗吸驱油效率的影响，研究页岩油储层压裂渗吸驱油机理。测试了处理剂的表面张力、界面张力和润湿性，考察了处理剂与常规压裂液的配伍性，评价了不同孔隙尺寸岩样的渗吸驱油效率。结果表明：阴离子表面活性剂AOS（α-烯基磺酸钠）为最佳压裂液润湿改性处理剂，颗粒、基质和裂缝岩样的渗吸驱油效率分别为8.17%、17.55%和37.37%。证实渗吸驱油动力包括浮力、浮力-毛细管力和毛细管力，改性剂通过改变岩石润湿性增强毛细管力提高驱油效率，较常规压裂液渗吸驱油效率提高约152.9%。孔隙结构影响渗吸驱油的主导作用力，小孔以毛细管力为主，天然、水力裂缝则以浮力为主。通过研究压裂液渗吸驱油机理，对致密页岩油高效开发具有指导意义。

关键词: 页岩油, 渗吸驱油, 润湿改性, 孔隙结构, 毛细管力

Abstract:

The imbibition displacement of fracturing fluid is a key technique for enhancing oil recovery in shale oil reservoirs. This paper assesses the impact of fracturing fluid wetting modifiers on the efficiency of imbibition displacement and explores the underlying mechanisms at play in shale oil reservoirs. Tests were conducted on the surface tension, interfacial tension, and wettability of the treating agent, alongside investigations into its compatibility with conventional fracturing fluids. Additionally, the imbibition displacement efficiency of rock samples with varying pore sizes was evaluated. The results indicate that the anionic surfactant AOS proved to be the most effective treatment agent for improving the wetting properties of fracturing fluids. The imbibition displacement efficiencies observed were 8.17% for particles, 17.55% for matrix, and 37.37% for fractured rock samples. These findings demonstrate that the imbibition displacement force encompasses buoyancy, buoyancy-capillary, and capillary forces. By altering rock wettability, the modifier significantly enhances the capillary force, thus boosting oil displacement efficiency by approximately 152.9% compared to conventional fracturing fluids. The influence of pore structure on the dominant imbibition displacement force was also noted. Capillary forces were predominant in small pores, and buoyancy is the main force for natural and hydraulic fractures. The research on the imbibition displacement mechanism of fracturing fluid provides valuable guidance for the efficient development of tight shale oil reservoirs.

Key words: shale oil, imbibition displacement, wetting modification, pore structure, capillary force

中图分类号:

TE357

刘绪钢,李国锋,李雷等. 页岩油储层压裂液渗吸驱油机理研究[J]. 油气藏评价与开发, 2024, 14(5): 756-763.

LIU Xugang,LI Guofeng,LI Lei, et al. Imbibition displacement mechanism of fracturing fluid in shale oil reservoir[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(5): 756-763.

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参考文献 21

[1]	管保山, 刘玉婷, 梁利, 等. 页岩油储层改造和高效开发技术[J]. 石油钻采工艺, 2019, 41(2): 212-223.
	GUAN Baoshan, LIU Yuting, LIANG Li, et al. Shale oil reservoir reconstruction and efficient development technology[J]. Oil Drilling & Production Technology, 2019, 41(2): 212-223.
[2]	刘显阳, 李士祥, 周新平, 等. 鄂尔多斯盆地石油勘探新领域、新类型及资源潜力[J]. 石油学报, 2023, 44(12): 2070-2090. doi: 10.7623/syxb202312005
	LIU Xianyang, LI Shixiang, ZHOU Xinping, et al. New fields, new types and resource potentials of petroleum exploration in Ordos Basin[J]. Acta Petrolei Sinica, 2023, 44(12): 2070-2090. doi: 10.7623/syxb202312005
[3]	付金华, 李士祥, 牛小兵, 等. 鄂尔多斯盆地三叠系长7段页岩油地质特征与勘探实践[J]. 石油勘探与开发, 2020, 47(5): 870-883. doi: 10.11698/PED.2020.05.03
	FU Jinhua, LI Shixiang, NIU Xiaobing, et al. Geological characteristics and exploration of shale oil in Chang 7 Member of Triassic Yanchang Formation, Ordos Basin, NW China[J]. Petroleum Exploration and Development, 2020, 47(5): 870-883.
[4]	SAPUTRA I W R, PARK K H, ZHANG F, et al. Surfactant assisted spontaneous imbibition to improve oil recovery on the Eagle Ford and Wolf camp shale oil reservoir: Laboratory to field analysis[J]. Energy & Fuels, 2019, 33(8): 6904-6920.
[5]	赵清民, 伦增珉, 章晓庆, 等. 页岩油注CO₂动用机理[J]. 石油与天然气地质, 2019, 40(6): 1333-1338.
	ZHAO Qingmin, LUN Zengmin, ZHANG Xiaoqing, et al. Mechanism of shale oil mobilization under CO₂ injection[J]. Oil & Gas Geology, 2019, 40(6): 1333-1338.
[6]	吴承美, 许长福, 陈依伟, 等. 吉木萨尔页岩油水平井开采实践[J]. 西南石油大学学报(自然科学版), 2021, 43(5): 33-41. doi: 10.11885/j.issn.1674-5086.2021.01.21.01
	WU Chengmei, XU Changfu, CHEN Yiwei, et al. The horizontal well exploitation practice of Jimsar shale oil[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(5): 33-41.
[7]	范华波, 薛小佳, 李楷, 等. 驱油型表面活性剂压裂液的研发与应用[J]. 石油与天然气化工, 2019, 48(1): 74-79.
	FAN Huabo, XUE Xiaojia, LI Kai, et al. Development and application of flooding surfactant fracturing fluid[J]. Chemical Engineering of Oil & Gas, 2019, 48(1): 74-79.
[8]	张志升. 适用于致密砂岩储层的多功能表面活性剂驱油压裂液体系[J]. 大庆石油地质与开发, 2020, 39(1): 169-174.
	ZHANG Zhisheng. Multifunction surfactant oil-displacing fracturing fluid system suitable for tight sandstone reservoirs[J]. Petroleum Geology & Oilfield Development in Daqing, 2020, 39(1): 169-174.
[9]	肖程释. 复合压裂液体系提高致密油藏渗吸采收率实验研究[D]. 大庆: 东北石油大学, 2017.
	XIAO Chengshi. Experimental study on improving imbibition recovery of tight reservoir by composite fracturing fluid system[D]. Daqing: Northeast Petroleum University, 2017.
[10]	张金风, 梁成钢, 陈依伟, 等. 表面活性剂对页岩油储层高温高压渗吸驱油效果的影响因素[J]. 大庆石油地质与开发, 2023, 42(3): 167-174.
	ZHANG Jinfeng, LIANG Chenggang, CHEN Yiwei, et al. Influence factors of surfactant on high-temperature and high-pressure imbibition displacement effect of shale oil reservoir[J]. Petroleum Geology & Oilfield Development in Daqing, 2023, 42(3): 167-174.
[11]	蔡建超, 郁伯铭. 多孔介质自发渗吸研究进展[J]. 力学进展, 2012, 42(6): 735-754.
	CAI Jianchao, YU Boming. Advances in studies of spontaneous imbibition in porous media[J]. Advances in Mechanics, 2012, 42(6): 735-754.
[12]	高陪. 致密砂岩储层渗吸特征实验研究: 以Y致密气藏和H致密油藏为例[D]. 西安: 西安石油大学, 2016.
	GAO Pei. Experimental study on permeability and absorption characteristics of tight sandstone reservoir: In Y tight gas reservoir and H tight reservoir as an example[D]. Xi'an: Xi'an Shiyou University, 2016.
[13]	VALLURI M K, ALVAREZ J O, SCHECHTER D S. Study of the rook/fluid interactions of sodium and calcium brines with ultra-tight rock surfaces and their impact on improving oil recovery by spontaneous imbibition[C]// Paper SPE-180274-MS presented at the SPE Low Perm Symposium, Denver, Colorado, USA, May 2016.
[14]	HU Q H, EWING P R, DULTZ S. Low pore connectivity in natural rock[J]. Journal of Contaminant Hydrology, 2012, 133: 76-83. doi: 10.1016/j.jconhyd.2012.03.006 pmid: 22507286
[15]	ROYCHAUDHURI B, TSOTISIS T, JESSEN K. An experimental investigation of spontaneous imbibition in gas shales[C]// Paper SPE-147652-MS presented at the SPE Annual Technical Conference and Exhibition, Denver, Colorado, USA, October 2011.
[16]	MENG M M. GE H K. JI W M, et al. Investigation on the variation of shale permeability with spontaneous imbibition time: Sandstones and volcanic rocks as comparative study[J]. Journal of Natural Gas Science and Engineering, 2015, 27: 1546-1554.
[17]	JADHUNANDAN P P, MORROW N R. Effect of wettability on waterflood recovery for crude-oil/brine/rock systems[J]. Society of Petroleum Engineers, 1995, 10(1): 40-46.
[18]	李士奎, 刘卫东, 张海琴, 等. 低渗透油藏自发渗吸驱油实验研究[J]. 石油学报, 2007, 28(2): 109-112. doi: 10.7623/syxb200206022
	LI Shikui, LIU Weidong, ZHANG Haiqin, et al. Experimental study of spontaneous imbibition in low-permeability reservoir[J]. Acta Petrolei Sinica, 2007, 28(2): 109-112. doi: 10.7623/syxb200206022
[19]	李爱芬, 凡田友, 赵琳. 裂缝性油藏低渗透岩心自发渗吸实验研究[J]. 油气地质与采收率, 2011, 18(5): 67-69.
	LI Aifen, FAN Tianyou, ZHAO lin. Experimental study of spontaneous imbibition in low permeability core, fractured reservoir[J]. Petroleum Geology and Recovery Efficiency, 2011, 18(5): 67-69.
[20]	汪伟英, 张公社. 束缚水饱和度、岩石性质对自吸的影响[J]. 石油学报, 2000, 21(3): 66-69. doi: 10.7623/syxb200003013
	WANG Weiying, ZHANG Gongshe. Effect of initial water saturation and rock lithology on spontaneous imbibition[J]. Acta Petrolei Sinica, 2000, 21(3): 66-69. doi: 10.7623/syxb200003013
[21]	CAI J C, JIN T X, KOU J S, et al. Lucas-Washburn equation-based modeling of capillary-driven flow in porous systems[J]. Langmuir, 2021, 37(5): 1623-1636. doi: 10.1021/acs.langmuir.0c03134 pmid: 33512167

渗吸流体	黏度/（mPa·s）	界面张力/（mN/m）	接触角/（°）
处理剂改性压裂液体系	2.6	0.041	28.4
现用改性压裂液体系	2.7	0.062	32.1
常规滑溜水	3.1	0.650	41.8

处理剂种类	“气-水-固”三相接触角/（°）						平均值/（°）
处理剂种类	DA-31	DA-32	DA-33	DA-34	DA-35	DA-36	平均值/（°）
OA-14	23.2	31.3	23.2	24.9	22.4	20.1	24.18
CTAB	21.2	26.5	24.5	25.6	20.9	22.4	23.52
HSB1214	28.9	23.8	19.3	25.2	21.6	29.5	24.71
LHSB	40.9	41.3	36.8	29.5	22.9	24.2	32.60
AOS	9.4	15.4	8.8	6.7	13.0	15.3	11.40
现用改性剂	25.1	30.2	22.8	21.5	17.6	22.3	23.25
常规滑溜水	42.1	44.2	29.9	26.8	32.7	48.1	37.30

处理剂种类	实验条件	“油-水-固”三相接触角/（°）							平均值/（°）
处理剂种类	实验条件	DA-37		DA-38	DA-39		DA-40		平均值/（°）
OA-14	模拟油浸泡 48 h	63.2	84.1		70.8	88.5		75.15
CTAB		67.2	71.1		65.8	59.4		65.88
HSB1214		87.6	94.1		79.7	88.5		87.48
LHSB		72.9	88.2		95.0	92.4		87.13
AOS		50.8	71.4		55.7	72.2		60.53
现用改性剂		63.5		58.9	68.7		65.1		64.05
常规滑溜水		98.3		86.9	92.1		98.6		93.98

改性压裂液体系	配方	油水表面张力/（mN/m）	油水界面张力/（mN/m）
常规滑溜水	0.02%降阻剂+0.1%助排剂+0.1%破乳剂	25.1	0.650
现用改性压裂液体系	常规滑溜水+0.05%驱油剂+0.1%润湿反转剂	24.2	0.062
OA-14改性压裂液体系	常规滑溜水+0.1%OA-14	26.8	0.095
AOS改性压裂液体系	常规滑溜水+0.1%AOS	21.5	0.041
CTAB改性压裂液体系	常规滑溜水+0.05%CTAB	—	—