魏旭,李革,王海涛,于艳涛,任伟,周炳存
WEI Xu,LI Ge,WANG Haitao,YU Yantao,REN Wei,ZHOU Bingcun

• 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采油工艺研究院
• 3:黑龙江省油气藏增产增注重点实验室

摘要(Abstract)：

为提升古龙页岩油储层裂缝垂向扩展高度，通过耦合室内实验与矿场数据，深入剖析了页理特征、地应力场及施工参数对裂缝垂向延伸的影响机制。结果表明：页理断裂能与页理缝数量控制了裂缝的垂向扩展，低断裂能、多页理缝限制了裂缝高度，易形成“工”字形裂缝；当垂向主应力与最小水平主应力差增加到14 MPa时，裂缝穿透页理缝更容易，平均裂缝高度提升20%；施工参数中，压裂液黏度提升至15 mPa·s，平均裂缝高度提升了70%，继续提升黏度，低断裂能（小于250 Pa·m）储层中平均裂缝高度提升了15%，远大于其他断裂能条件下的6.4%；施工排量对裂缝高度的调控呈“增幅减缓”特征，高断裂能储层中缝高增量呈“先增后减”趋势。矿场试验表明，在相同地质条件下，提升压裂液黏度及单缝施工排量能显著提升压裂裂缝高度。研究成果为古龙页岩油储层压裂参数设计提供了理论与实践依据。
In order to increase the vertical fracture propagation height in Gulong shale reservoirs, influence mechanisms of lamellation characteristics, in-situ stress fields and operation parameters are deeply analyzed by coupling laboratory experiments and field data. The results show that vertical fracture propagation is controlled by lamellation fracture energy and lamellation fractures density. Low fracture energy and high lamellation fracture density constrain height growth, promoting “I-shaped” fractures. When vertical-to-minimum horizontal stress difference increases to 14 MPa, fractures are easier to penetrate through lamellation fractures, with average fracture height increased by 20%. Increasing fracturing fluid viscosity to 15 mPa·s elevates average fracture height by 70%. Further viscosity increases yield a 15% height gain in low-fracture-energy reservoirs(<250 Pa·m), significantly higher than the 6.4% observed in other conditions. Pumping displacment exhibits a “growth deceleration” effect on fracture height control, with an “increase first-then decrease” trend shown in high-fracture-energy reservoirs. Field tests indicate that under similar geological conditions, increasing fracturing fluid viscosity and single-fracture pumping displacement significantly improves fracture height. The research provides theoretical and practical reference for fracturing parameters design in Gulong shale reservoirs.

关键词(KeyWords)： 古龙页岩;页理特征;施工参数;裂缝高度;压裂液黏度;断裂能
Gulong shale;lamellation characteristics;operation parameters;fracture height;fracturing fluid viscosity;fracture energy

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司科技项目“陆相页岩油规模增储上产与勘探开发技术研究”（2023ZZ15YJ04）;; 黑龙江省重点研发计划（创新基地）项目“多资源协同陆相页岩油绿色开采全国重点实验室”（JD2023GJ02）

作者(Author): 魏旭,李革,王海涛,于艳涛,任伟,周炳存
WEI Xu,LI Ge,WANG Haitao,YU Yantao,REN Wei,ZHOU Bingcun

DOI: 10.19597/J.ISSN.1000-3754.202509037

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