Characteristics of fracture propagation in radial wellbores of shale oil reservoirs with multiple lithologic layers

doi:10.7623/syxb202403006

Acta Petrolei Sinica ›› 2024, Vol. 45 ›› Issue (3): 559-573,585.DOI: 10.7623/syxb202403006

• OIL FIELD DEVELOPMENT • Previous Articles Next Articles

Characteristics of fracture propagation in radial wellbores of shale oil reservoirs with multiple lithologic layers

Wu Xiaoguang¹, Long Tengda¹, Huang Zhongwei¹, Gao Wenlong², Li Gensheng¹, Xie Zixiao¹, Yang Rui¹, Lu Jingsong¹, Ma Jinliang¹

1. National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum(Beijing), Beijing 102249, China;
2. CNPC Great Wall Drilling Engineering Co., Ltd., Beijing 100101, China

Received:2023-05-31 Revised:2024-01-19 Online:2024-03-25 Published:2024-04-10

页岩油多岩性交互储层径向井穿层压裂裂缝扩展特征

武晓光¹, 龙腾达¹, 黄中伟¹, 高文龙², 李根生¹, 谢紫霄¹, 杨芮¹, 鲁京松¹, 马金亮¹

1. 油气资源与工程全国重点实验室, 中国石油大学(北京) 北京 102249;
2. 中国石油集团长城钻探工程有限公司北京 100101

通讯作者: 黄中伟,男,1972年4月生,2006年获中国石油大学(华东)博士学位,现为中国石油大学(北京)石油工程学院教授,主要从事高压水射流技术在石油工程中的理论与应用研究工作。Email:huangzw@cup.edu.cn
作者简介:武晓光,男,1991年12月生,2020年获中国石油大学(北京)博士学位,现为中国石油大学(北京)碳中和示范性能源学院特任岗位副教授,主要从事新型射流钻完井和非常规油气储层改造理论与技术研究工作。Email:wuxg@cup.edu.cn
基金资助:
国家自然科学基金青年科学基金项目(No.52204019)、国家自然科学基金重点国际(地区)合作项目(No.52020105001)、国家自然科学基金青年科学基金重大项目(No.52192624)和中国石油大学(北京)前瞻导向项目(2462022QZDX005)资助。

Abstract

Abstract: Midium-high mature continental shale oil is a major substituted field in oil and gas exploration and development, but facing some challenges such as multi-lithology interaction and low degree of longitudinal reformation. How to fully activate longitudinal production zone is the key to achieve volume fracturing and obtain high and stable production of shale oil. For this reason, a novel idea of cross-layer fracturing in radial wells was proposed, which aims to guide longitudinal multi-layer fracture initiation by penetrating the interlayer and lithologic interface through radial borehole, thus solving the problem of limited fracture height. In order to determine the feasibility of above idea, a true tri-axial cross-layer fracturing experiment was conducted. By means of CT scanning and 3D fracture reconstruction technology, the paper clarifies the characteristics of fracture initiation and penetration induced by radial well, and analyzes the influence law of vertical stress difference, displacement and radial well length on the fracture initiation and penetration. The results indicate that the radial well has the ability of guiding fracture propagation and promoting longitudinal fracture penetration, which can effectively reduce the difficulty of fracture penetration through layers and increase the longitudinal fracture propagation height. With the increase of vertical stress difference, the effect of fracture propagation induced by radial well is enhanced, and the fracture initiation changes from cross-layer cracking mode to simultaneous multi-layer cracking mode, crossing the lithology interface. The fracture is dominated by low-strength layers under low displacement, and increasing displacement is conducive to longitudinal fracture propagation across layers. With the increase of radial length, the wellbore has the enhanced ability of inducing fractures to cross the layer interface. The key findings are expected to provide solutions to the limitation of longitudinal fracture propagation height in continental shale oil reservoirs.

Key words: shale oil, radial well, cross-layer fracturing, fracture propagation, multi-lithology layer

摘要： 中-高成熟陆相页岩油是中国油气勘探开发的重大接替领域,但存在多岩性交互、纵向改造程度低的难题。充分动用纵向产层是实现页岩油体积压裂、获得高产与稳产的关键。为此,提出了径向井穿层压裂新思路,旨在通过径向井眼穿透隔夹层和岩性界面,引导纵向多层系起裂,解决缝高延伸受限的难题。为探究方法的可行性,开展了真三轴径向井穿层压裂实验,借助CT扫描和裂缝三维重构技术,阐明了径向井引导裂缝穿层起裂及扩展特征,分析了垂向应力差异、压裂液排量、径向井长度等参数对径向井诱导裂缝穿层的影响规律。研究结果表明:径向井具有导向裂缝扩展和诱导裂缝纵向穿层的特性,可有效降低裂缝穿层难度,提升纵向扩展高度;垂向应力差异增加,径向井诱导裂缝穿层效果增强,裂缝由跨层起裂向各层同时起裂转变,突破岩性界面;小排量下裂缝以低强度岩层跨层起裂为主,提高排量有助于裂缝纵向穿层扩展;径向井长度增加,诱导裂缝穿层能力增强。研究结果有望为中国陆相页岩油储层纵向改造高度受限的难题提供解决思路。

关键词: 页岩油, 径向井, 穿层压裂, 裂缝扩展, 多岩性层

CLC Number:

TE357

Wu Xiaoguang, Long Tengda, Huang Zhongwei, Gao Wenlong, Li Gensheng, Xie Zixiao, Yang Rui, Lu Jingsong, Ma Jinliang. Characteristics of fracture propagation in radial wellbores of shale oil reservoirs with multiple lithologic layers[J]. Acta Petrolei Sinica, 2024, 45(3): 559-573,585.

武晓光, 龙腾达, 黄中伟, 高文龙, 李根生, 谢紫霄, 杨芮, 鲁京松, 马金亮. 页岩油多岩性交互储层径向井穿层压裂裂缝扩展特征[J]. 石油学报, 2024, 45(3): 559-573,585.

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Characteristics of fracture propagation in radial wellbores of shale oil reservoirs with multiple lithologic layers

页岩油多岩性交互储层径向井穿层压裂裂缝扩展特征

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