纹层页岩CO2复合压裂裂缝特征及穿层扩展规律

doi:10.11885/j.issn.1674-5086.2023.09.14.03

西南石油大学学报(自然科学版) ›› 2026, Vol. 48 ›› Issue (2): 64-74.DOI: 10.11885/j.issn.1674-5086.2023.09.14.03

纹层页岩CO₂复合压裂裂缝特征及穿层扩展规律

张潦源¹, 鲁明晶¹, 邱仁怡², 张子麟¹, 张广清², 周大伟²

1. 中国石化胜利油田分公司石油工程技术研究院, 山东东营 257000;
2. 中国石油大学(北京)石油工程学院, 北京昌平 102249

收稿日期:2023-09-14 发布日期:2026-04-30
通讯作者: 张广清，E-mail:zhangguangqing@cup.edu.cn
作者简介:张潦源，1980年，男，汉族，浙江金华人，研究员，主要从事压裂酸化改造技术方向的研究。E-mail:zhangliaoyuan.slyt@sinopec.com
鲁明晶，1986年生，男，汉族，山东栖霞人，副研究员，主要从事非常规油气渗流及储层改造研究与应用工作。E-mail:lumingjing001@126.com
邱仁怡，1999年生，男，汉族，四川仁寿人，博士研究生，主要从事岩石力学、水力压裂方面的研究工作。E-mail:1796765916@qq.com
张子麟，1989年生，男，汉族，山东莘县人，研究员，主要从事非常规储层改造研究工作。E-mail:zhangzilin555.slyt@sinopec.com
张广清，1975年生，男，汉族，山东德州人，教授，主要从事石油工程岩石力学基础与应用研究方面的工作。E-mail:zhangguangqing@cup.edu.cn
周大伟，1988年生，男，汉族，山东潍坊人，副教授，主要从事非常规油气岩石力学及水力压裂技术应用。E-mail:zdw@cup.edu.cn
基金资助:
国家科技重大专项（2024ZD1405105）

Fracture Characteristics and Layer-crossing Propagation Law of CO₂ Hybrid Fracturing in Laminated Shale

ZHANG Liaoyuan¹, LU Mingjing¹, QIU Renyi², ZHANG Zilin¹, ZHANG Guangqing², ZHOU Dawei²

1. Research Institute of Petroleum Engineering Technology, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257000, China;
2. College of Petroleum Engineering, China University of Petroleum (Beijing), Changping, Beijing 102249, China

Received:2023-09-14 Published:2026-04-30

摘要/Abstract

摘要： 为探究纹层型页岩CO₂复合压裂裂缝特征及穿层扩展规律，采用全直径济阳拗陷页岩岩芯开展CO₂复合压裂实验，并利用Cohesive单元模型模拟了前置CO₂注入速率对裂缝穿层扩展的影响。研究结果表明： 1）前置CO₂易于激活层理及天然裂缝，为后续水力压裂形成复杂交叉裂缝提供了条件，且前置CO₂注入速率提高1倍，裂缝体积提高了24.0%； 2） CO₂的低黏度、高渗透性易诱导裂缝沿弱面（层理、天然裂缝）、矿物晶界和孔隙方向扩展，导致CO₂压裂裂缝比水力裂缝粗糙度高约50.0%； 3） CO₂压裂裂缝穿层能力随注入速率增加而增加，低注入速率下层理主导裂缝扩展，高注入速率下地应力主导裂缝扩展。研究成果为济阳拗陷页岩油储层CO₂复合压裂裂缝扩展规律提供了机理和理论上的认识，与现场常规压裂相比，CO₂复合压裂储层改造体积提高了12.2%，产能提高了33.0%，产油递减率降低了6.8%。

关键词: CO₂复合压裂, 纹层页岩, 裂缝空间形态, 粗糙度, 注入速率

Abstract: To investigate the fracture characteristics and layer-crossing propagation law of CO₂-hybrid fracturing in laminated shale, CO₂-hybrid fracturing experiments were conducted with the full-diameter Jiyang Sag Shale, and the Cohesive unit model was used to simulate the effect of pre-CO₂ injection rate on layer-crossing propagation. The results show that: 1) CO₂ fracturing is easy to activate beddings and natural fractures, which provides conditions for the formation of complex cross fractures in subsequent hydraulic fracturing, and the fracture volume increased by 24.0% with doubled pre-CO₂ injection rate; 2) The low viscosity and high permeability of CO₂ easily induce fractures to propagate along weak surfaces (beddings, natural fractures), mineral grain boundaries, and pore directions, resulting in the roughness of CO₂ fracturing fractures about 50.0% higher than hydraulic fractures; 3) With the increase of CO₂ injection rate, the ability of fracture to pass through beddings is enhanced. At low CO₂ injection rate, fracture propagation is dominated by bedding, while fracture propagation is dominated by in-situ stress at high injection rate. The research results provide the mechanism and theoretical understanding of the fracture propagation law of CO₂-hybrid fracturing of shale oil reservoir in Jiyang Sag. Compared with conventional fracturing in the field, the stimulation volume of CO₂-hybrid fracturing increased by 12.2%, capacity by 33%, and decline rate of oil production decreased by 6.8%.

Key words: CO₂-hybrid fracturing, laminated shale, fracture spatial morphology, roughness, injection rate

中图分类号:

TE121

张潦源, 鲁明晶, 邱仁怡, 张子麟, 张广清, 周大伟. 纹层页岩CO₂复合压裂裂缝特征及穿层扩展规律[J]. 西南石油大学学报(自然科学版), 2026, 48(2): 64-74.

ZHANG Liaoyuan, LU Mingjing, QIU Renyi, ZHANG Zilin, ZHANG Guangqing, ZHOU Dawei. Fracture Characteristics and Layer-crossing Propagation Law of CO₂ Hybrid Fracturing in Laminated Shale[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(2): 64-74.

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纹层页岩CO₂复合压裂裂缝特征及穿层扩展规律

Fracture Characteristics and Layer-crossing Propagation Law of CO₂ Hybrid Fracturing in Laminated Shale

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