代旭,沙宗伦,王瑞,单高军,王建凯,陈铭,张九然
DAI Xu,SHA Zonglun,WANG Rui,SHAN Gaojun,WANG Jiankai,CHEN Ming,ZHANG Jiuran

• 1:多资源协同陆相页岩油绿色开采全国重点实验室
• 2:中国石油大庆油田有限责任公司勘探开发研究院
• 3:中国石油大庆油田有限责任公司

摘要(Abstract)：

针对古龙页岩油立体开发井间干扰机制不明确的问题，利用实验与数值模拟相结合的方法，开展了干扰压力传播规律及人工缝网延展特征研究。实验中测定出不同围压下的干扰压力峰值为0.110～0.281 MPa，发现了压力传播受围压梯度与页理面的双重控制；利用数值模拟分析了井距（400～800 m）、层位（青山口组一段的Q_2、Q_3油层、青二段的Q_9油层）及夹层厚度（1、3 m）对裂缝扩展与压力场的影响。结果表明：当井距小于等于400 m时以裂缝干扰为主，当井距达到400～600 m时转为应力干扰主导，当井距大于等于600 m时干扰基本消失；相较Q_2、Q_3油层，Q_9油层脆性更大，易形成窄、长缝，引发强干扰；3 m厚度的高应力夹层限制了垂向连通，1 m厚度的夹层易压窜。研究成果为古龙页岩油立体开发井网布局和压裂改造优化提供了科学依据。
Aiming at the unclear mechanisms of interwell interference in three-dimensional development of Gulong shale oil, research on interference pressure propagation pattern and artificial fracture network extension characteristics is conducted by combining experimental and numerical simulation methods. Experimental results under various confining pressures shows the measured interwell pressure peaks ranging from 0.110 to 0.281 MPa. Pressure propagation is controlled by both confining pressure gradients and bedding planes. The influence of well spacing(400～800 m), reservoirs(Q_2 and Q_3 reservoirs in Qing-1 Member of Qingshankou Formation, and Q_9 reservoir of Qing-2 Member) and interlayer thickness(1, 3 m) on fracture propagation and pressure field is analyzed by numerical simulation. The results indicate that, when well spacing is ≤400 m, fracture interference is dominated, with stress interference dominated at 400～600 m, and the interference is almost negligible at ≥600 m. Compared to Q_2 and Q_3 reservoirs, Q_9 reservoir with higher brittleness tends to form narrow and long fractures, causing strong interference. High-stress interlayers with thickness of 3 m restrict the vertical connectivity, while interlayers with thickness of 1m are prone to fracture channeling. The research provides scientific basis for optimizing well patterns layout and fracturing stimulation in three-dimensional development of Gulong shale oil.

关键词(KeyWords)： 古龙页岩油;合理井距;井间干扰;裂缝扩展;立体开发
Gulong shale oil;rational well spacing;interwell interference;fracture propagation;three-dimensional development

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“泥纹型页岩油立体开发技术示范”（2024ZD1404904）;; 中国石油天然气股份有限公司重大专项“陆相页岩油开发优化技术研究与试验”（2023ZZ15YJ03）

作者(Author): 代旭,沙宗伦,王瑞,单高军,王建凯,陈铭,张九然
DAI Xu,SHA Zonglun,WANG Rui,SHAN Gaojun,WANG Jiankai,CHEN Ming,ZHANG Jiuran

DOI: 10.19597/J.ISSN.1000-3754.202509027

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