Research status and development trend of the formation mechanism of complex fractures by staged volume fracturing in horizontal wells

doi:10.7623/syxb202012025

Acta Petrolei Sinica ›› 2020, Vol. 41 ›› Issue (12): 1734-1743.DOI: 10.7623/syxb202012025

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Research status and development trend of the formation mechanism of complex fractures by staged volume fracturing in horizontal wells

Pu Chunsheng^1,2, Zheng Heng^1,2,3, Yang Zhaoping⁴, Gao Zhendong⁵

1. School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
2. Key Laboratory of Unconventional Oil&Gas Development, Ministry of Education, Shandong Qingdao 266580, China;
3. School of Petroleum Engineering, Yangtze University, Hubei Wuhan 434000, China;
4. Northwest Branch, PetroChina Research Institute of Petroleum Exploration and Development, Gansu Lanzhou 730020, China;
5. Yanchang Oil Field Company Limited, Shaanxi Yan'an 716100, China

Received:2020-04-05 Revised:2020-08-01 Online:2020-12-25 Published:2021-01-06

水平井分段体积压裂复杂裂缝形成机制研究现状与发展趋势

蒲春生^1,2, 郑恒^1,2,3, 杨兆平⁴, 高振东⁵

1. 中国石油大学(华东)石油工程学院山东青岛 266580;
2. 教育部非常规油气藏开发重点实验室山东青岛 266580;
3. 长江大学石油工程学院湖北武汉 434000;
4. 中国石油勘探开发研究院西北分院甘肃兰州 730020;
5. 延长油田股份有限公司陕西延安 716100

通讯作者: 郑恒,男,1988年11月生,2012年获长江大学学士学位,2020年获中国石油大学(华东)博士学位,现为长江大学石油工程学院博士后,主要从事非常规油气储层改造工艺研究。Email:hengsmith111@163.com
作者简介:蒲春生,男,1959年3月生,1982年获西安交通大学计算数学专业学士学位,1992年获西南石油学院博士学位,现为中国石油大学(华东)教授、博士生导师,主要从事复杂油气藏物理-化学强化开采技术及非常规油气资源开发方面的研究。Email:chshpu_tx@126.com
基金资助:
国家科技重大专项（2009ZX05009）和国家自然科学基金项目（No.51104173）资助。

Abstract

Abstract:

Staged volume fracturing in horizontal wells is one of the important technologies for the formation of complex fracture networks in reservoirs. To accurately understand the formation mechanism of complex fracture networks and predict the patterns of complex fracture networks is of great significance to the efficient development of unconventional oil and gas resources, and provides a theoretical basis for the design optimization of hydraulic fracturing. Focusing on the formation mechanism of complex fractures in unconventional reservoirs, domestic and foreign scholars have established hydraulic fracturing models according to the impacts of "stress shadow effect" on the simultaneous propagation of hydraulic fractures and those of hydraulic fracturing sequence on the dynamic propagation of multiple fractures, the blocking effect of bedding plane on the longitudinal expansion of hydraulic fractures, and the interactive dynamics between natural fractures and hydraulic fractures; they conducted qualitative analysis from the perspective of numerical simulation. By summarizing the research status at home and abroad and analyzing the existing model in terms of the assumed conditions of model establishment, ideas of numerical simulation model and model limitations, this paper puts forward suggestions for future research directions, which can provide a reference for studying the formation mechanisms of complex fractures by hydraulic fracturing in the future.

Key words: hydraulic fracturing, induced stress, unconventional reservoir, dynamics, damage

摘要：

水平井分段体积压裂是油气储层中复杂裂缝网络形成的重要技术之一，准确了解复杂裂缝网络形成机制、预测复杂裂缝网络形态对非常规油气资源高效开发具有重要意义，同时也是水力压裂设计优化的理论基础。围绕非常规储层复杂裂缝形成机制，国内外学者根据"应力阴影"效应对水力裂缝同步扩展、水力压裂顺序对多裂缝动态延伸影响、层理面对水力裂缝纵向扩展遮挡效应和天然裂缝与水力裂缝交互动态等方面，分别建立了相应的水力压裂模型，并从数值模拟角度对其进行了定性分析。通过总结国内外研究现状，并从模型建立假设条件、数值模拟模型思想和模型局限性3方面对现有模型进行了剖析，并对未来研究方向提出了建议，研究结果可对未来水力压裂复杂裂缝形成机制研究提供借鉴。

关键词: 水力压裂, 诱导应力, 非常规储层, 动力学, 损伤

CLC Number:

TE357.2

Pu Chunsheng, Zheng Heng, Yang Zhaoping, Gao Zhendong. Research status and development trend of the formation mechanism of complex fractures by staged volume fracturing in horizontal wells[J]. Acta Petrolei Sinica, 2020, 41(12): 1734-1743.

蒲春生, 郑恒, 杨兆平, 高振东. 水平井分段体积压裂复杂裂缝形成机制研究现状与发展趋势[J]. 石油学报, 2020, 41(12): 1734-1743.

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Research status and development trend of the formation mechanism of complex fractures by staged volume fracturing in horizontal wells

水平井分段体积压裂复杂裂缝形成机制研究现状与发展趋势

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