Imbibition of fracturing fluid and microscopic oil production characteristics in Chang 7 shale reservoir in Ordos Basin

被引：0
|
作者：
Wang C. [1 ,2 ]
Gao H. [1 ,2 ]
Fei E. [3 ]
Liu B. [4 ]
Wang K. [5 ]
Li T. [1 ,2 ]
Liu Y. [6 ]
机构：
[1] School of Petroleum Engineering, Xi̍an Shiyou University, Xi'an
[2] Xi̍an Key Laboratory of Tight Oil (Shale Oil) Development, Xi'an
[3] No. 3 Oil Production Plant, PetroChina Changqing Oilfield Company, Yinchuan
[4] No. 8 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi'an
[5] No. 10 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang
[6] College of Petroleum Engineering, China University of Petroleum(Beijing), Beijing
来源：
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2023年 / 47卷 / 06期
关键词：
Chang 7 shale reservoir; fracturing fluid imbibition; imbibition rate; imbibition recovery rate; nuclear magnetic resonance technique;
D O I：
10.3969/j.issn.1673-5005.2023.06.011
中图分类号：
学科分类号：
摘要：
In order to reveal the imbibition displacement behaviour of fracturing fluid in Chang 7 shale reservoir in Ordos Basin and evaluate the microscopic oil production characteristics in imbibition stage, core samples of interbedded shale and thick bedded shale were selected to carry out experiments using a low-field nuclear magnetic resonance technique and an indoor high temperature and high pressure imbibition simulation device. The imbibition rate and imbibition efficiency of fracturing fluid and the microscopic oil production characteristics at different pore throat scales were quantitatively evaluated in the post-pressure imbibition stage of the shale reservoir after fracturing. The experimental results show that the imbibition process of fracturing fluid in shale reservoir can be divided into high-speed imbibition stage and stable imbibition stage. The imbibition rate of fracturing fluid in the shale reservoir can reach up to 3. 08% / h at 6 hours before imbibition. The imbibition rate and imbibition efficiency of small pore throats in interbedded shale reservoir are significantly higher than those of large pore throats, and the contribution of small pore throats to the total imbibition efficiency can reach to 81. 18%. The imbibition efficiency of thick layered shale in different pore throat scales is similar. In the fracturing stage of the shale reservoir, the permeability and clay mineral content of the shale reservoir are the main control factors affecting the imbibition effect of fracturing fluid. The relevant results and understanding obtained in this study can provide theoretical support for the optimization of fracturing scheme of shale reservoirs. © 2023 University of Petroleum, China. All rights reserved.
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页码：95 / 103
页数：8
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