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Open AccessArticle

Enhanced Tight Oil Recovery by Volume Fracturing in Chang 7 Reservoir: Experimental Study and Field Practice

by 1,2, 1,*, 3 and 4
1
Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Ministry of Education, Wuhan 430074, China
2
Department of Chemical Engineering, University of Calgary, Calgary, AB T2N1N4, Canada
3
Research Institute of Exploration & Development, Changqing Oilfield Company, PetroChina, Xi’an 710018, China
4
No. 12 Oil Production Plant, Changqing Oilfield Company, PetroChina, Xi’an 710018, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(12), 2419; https://doi.org/10.3390/en12122419
Received: 13 May 2019 / Revised: 13 June 2019 / Accepted: 19 June 2019 / Published: 24 June 2019
(This article belongs to the Special Issue Shale Oil and Shale Gas Resources)
The Chang 7 reservoir in Changqing oilfield is rich in tight oil. However, due to the low formation permeability, it is very difficult to obtain economical oil production without stimulation treatments. Volume fracturing seems to be a more efficient tight oil recovery enhancement (EOR) method in Chang 7 pilot tests compared with conventional hydraulic fracturing. In this study, Chang 7 tight oil reservoir was first characterized by its geological property, hydrocarbon source rock distribution, and formation physiochemical property. Tight core flooding tests were then conducted to experimentally investigate the EOR ability of the volume fracturing technique. The field-scale practice was also demonstrated and analyzed. The results show that Chang 7 reservoir is favorable for the generation of a large amount of tight oil. Fractures created in tight cores can significantly improve the fluid flow conductivity and enhance the imbibition of displacing water, resulting in a greater tight oil recovery increment. Volume fracturing is an effective way to generate a larger number of fractures. Field application indicates that volume fracturing treatment can form a much greater reservoir stimulation volume. Daily oil production in the volume-fracturing-treated wells can be more than twice as high as that in the conventional-fracturing-treated wells. View Full-Text
Keywords: volume fracturing; Chang 7 reservoir; tight oil recovery; imbibition; oil production volume fracturing; Chang 7 reservoir; tight oil recovery; imbibition; oil production
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MDPI and ACS Style

Yu, L.; Wang, J.; Wang, C.; Chen, D. Enhanced Tight Oil Recovery by Volume Fracturing in Chang 7 Reservoir: Experimental Study and Field Practice. Energies 2019, 12, 2419. https://doi.org/10.3390/en12122419

AMA Style

Yu L, Wang J, Wang C, Chen D. Enhanced Tight Oil Recovery by Volume Fracturing in Chang 7 Reservoir: Experimental Study and Field Practice. Energies. 2019; 12(12):2419. https://doi.org/10.3390/en12122419

Chicago/Turabian Style

Yu, Long; Wang, Jinjie; Wang, Chong; Chen, Daixin. 2019. "Enhanced Tight Oil Recovery by Volume Fracturing in Chang 7 Reservoir: Experimental Study and Field Practice" Energies 12, no. 12: 2419. https://doi.org/10.3390/en12122419

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