蔡萌,郭然,马文海,顾明勇,张明慧,罗洋
CAI Meng,GUO Ran,MA Wenhai,GU Mingyong,ZHANG Minghui,LUO Yang

• 1:多资源协同陆相页岩油绿色开采全国重点实验室
• 2:黑龙江省油气藏增产增注重点实验室
• 3:中国石油大庆油田有限责任公司采油工艺研究院

摘要(Abstract)：

针对四川盆地侏罗系凉高山组页岩储层多岩性叠置、纹层与层理发育及压裂成缝机理不明导致的体积改造难题，急需探索适配的体积压裂技术。以凉高山组页岩为研究对象，开展全直径岩心真三轴水力压裂物理模拟实验，结合数值模拟方法，探究页岩内人工裂缝纵向扩展形态规律，并在矿场先导试验A2井中，对比高低黏度液体组合与不变黏度压裂的实施效果。结果表明：凉高山组页岩隐性层理发育，无明显高角度天然裂缝，人工裂缝受层理影响呈复杂阶梯状；前置高黏压裂工艺可实现储层有利沟通与复杂裂缝网络形成；A2井压裂后日产油量为41.7 m~3、日产气量为5.13×10~4 m3，单井产能得到大幅提升；明确了凉高山组页岩纵向穿层裂缝扩展规律，前置高黏压裂工艺适配性良好。研究成果为同类储层改造提供了关键技术支撑。
Aiming at the volume stimulation challenges caused by multi-lithologies superposition, developed laminae and bedding, and unclear fracturing mechanisms in shale reservoirs of Jurassic Lianggaoshan Formation in Sichuan Basin, it is urgent to explore adaptive volume fracturing technologies. Taking Lianggaoshan Formation shale as research subject, true triaxial hydraulic fracturing physical simulation experiments are conducted on full-diameter cores. Combined with numerical simulation, the vertical propagation patterns of artificial fractures in shale are investigated. In pilot testing well A2, the performance of variable-viscosity fluid combinations and constant-viscosity fracturing are compared. The results show that Lianggaoshan Formation shale exhibits developed implicit bedding without obvious high-angle natural fractures. Artificial fractures are influenced by bedding, resulting in complex stepped geometries. High-viscosity prepad fracturing technology effectively promotes reservoir connectivity and the formation of complex fracture networks. Daily oil production in Well A2 reaches 41.7 m~3 after fracturing, and daily gas production reaches 5.13×10~4 m~3, significantly enhancing single-well productivity,clarifying the vertical penetration fracture propagation laws in Lianggaoshan Formation shale and demonstrating high adaptability of high-viscosity prepad fracturing technology. The research results provide key technical support for the stimulation of similar reservoirs.

关键词(KeyWords)： 四川盆地;侏罗系;凉高山组;裂缝扩展;页岩;体积压裂;真三轴物模;数值模拟
Sichuan Basin;Jurassic;Lianggaoshan Formation;fracture propagation;shale;volume fracturing;true triaxial physical simulation;numerical simulation

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司重大科技专项“非常规储层改造关键技术研究”（2023ZZ28YJ04）

作者(Author): 蔡萌,郭然,马文海,顾明勇,张明慧,罗洋
CAI Meng,GUO Ran,MA Wenhai,GU Mingyong,ZHANG Minghui,LUO Yang

DOI: 10.19597/J.ISSN.1000-3754.202509043

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