石油勘探与开发 >

2021 , Vol. 48 >Issue 2: 402 - 410

DOI: https://doi.org/10.11698/PED.2021.02.17

石油工程

页岩油多储集层穿层压裂缝高扩展特征

  • 王燚钊 ,
  • 侯冰 ,
  • 王栋 ,
  • 贾振华
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  • 1.中国石油大学（北京）油气资源与探测国家重点实验室,北京 102249;
    2.中国石油大学（北京）石油工程教育部重点实验室,北京 102249;
    3.中国石化中原油田分公司采油工程技术研究院,河南濮阳 457001
王燚钊（1994-）,男,河南周口人,中国石油大学（北京）石油工程学院在读博士,主要从事储集层地质力学以及岩石力学等方面研究工作。地址：北京市昌平区府学路18号,中国石油大学（北京）石油工程学院,邮政编码：102249。E-mail: yizhaowang123@163.com

收稿日期: 2020-06-17

  修回日期: 2021-02-17

  网络出版日期: 2021-03-19

基金资助

国家自然科学基金项目（51874328,52074311,U1762215,U19B6003-05）; 中国石油天然气集团有限公司-中国石油大学（北京）战略合作科技专项（ZLZX2020-02）

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Features of fracture height propagation in cross-layer fracturing of shale oil reservoirs

  • WANG Yizhao ,
  • HOU Bing ,
  • WANG Dong ,
  • JIA Zhenhua
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  • 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
    2. MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;
    3. Research Institute of Oil Production Engineering and Technology, Zhongyuan Oilfield Company, Sinopec, Puyang 457001, China

Received date: 2020-06-17

  Revised date: 2021-02-17

  Online published: 2021-03-19

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摘要

采用渤海湾盆地东濮凹陷沙河街组页岩油不同储集层全直径岩心进行真三轴压裂物理模拟实验,研究水力裂缝在不同储集层中的纵向扩展形态;采用全局嵌入内聚力单元的数值模拟方法建立考虑界面强度、射孔层位、压裂液排量的页岩油多储集层拟三维裂缝扩展数值模型,研究水力裂缝穿层扩展特征。研究表明：水力裂缝在致密砂岩层呈十字型扩展,在天然裂缝发育的砂岩层呈一字型扩展,在层理发育的页岩层形成阶梯缝;砂岩和页岩层中水力裂缝在纵向上均呈条带状延伸,页岩层纵向沟通层理后在横向上呈面状展布;受层理限制页岩层压裂缝高度最小,砂岩层主裂缝高度较大,砂岩、页岩两层同时压裂纵向连通后缝高延伸最大;优选砂岩、页岩界面强度高的层位射孔,提高压裂排量能够增加缝高延伸能力,实现页岩油多储集层穿层压裂增产改造的目标。图10表5参36

关键词： 页岩油; 多储集层; 穿层压裂; 裂缝扩展; 内聚力单元

本文引用格式

王燚钊 , 侯冰 , 王栋 , 贾振华 . 页岩油多储集层穿层压裂缝高扩展特征[J]. 石油勘探与开发, 2021 , 48(2) : 402 -410 . DOI: 10.11698/PED.2021.02.17

Abstract

Triaxial fracturing modeling experiments were carried out on whole diameter shale cores from different layers of Shahejie Formation in the Dongpu sag, Bohai Bay Basin to find out the vertical propagation shapes of hydraulic fractures in different reservoirs. A numerical simulation method of inserting cohesive elements globally was adopted to build a pseudo-three-dimension fracture propagation model for multiple shale oil reservoirs considering interface strength, perforation location and pump rate, to research the features of hydraulic fracture (HF) penetrating through layers. The hydraulic fracture propagates in a cross pattern in tight sandstone layers, in a straight line in sandstone layers with natural fractures, forms ladder fracture in shale layers with beddings. The hydraulic fracture propagates in a stripe shape vertically in both sandstone and shale layers, but it spreads in plane in shale layers after connecting beddings. Restricted by beddings, the hydraulic fractures in shale layers are smaller in height than those in sandstone layers. When a sandstone layer and a shale layer are fractured at the same time, the fracture extends the most in height after the two layers are connected. Perforating at positions where the sandstone-shale interface is higher in strength, and increasing the pumping rate can enhance the fracture height, thus achieving the goal of increasing the production by cross-layer fracturing in multiple shale oil layers.

Key words： shale oil; multiple reservoirs; cross-layer fracturing; fracture propagation; cohesive elements

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