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

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  • Long Yu

    (Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Ministry of Education, Wuhan 430074, China
    Department of Chemical Engineering, University of Calgary, Calgary, AB T2N1N4, Canada)

  • Jinjie Wang

    (Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Ministry of Education, Wuhan 430074, China)

  • Chong Wang

    (Research Institute of Exploration & Development, Changqing Oilfield Company, PetroChina, Xi’an 710018, China)

  • Daixin Chen

    (No. 12 Oil Production Plant, Changqing Oilfield Company, PetroChina, Xi’an 710018, China)

Abstract

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.

Suggested Citation

  • Long Yu & Jinjie Wang & Chong Wang & Daixin Chen, 2019. "Enhanced Tight Oil Recovery by Volume Fracturing in Chang 7 Reservoir: Experimental Study and Field Practice," Energies, MDPI, vol. 12(12), pages 1-22, June.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:12:p:2419-:d:242437
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    References listed on IDEAS

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    Cited by:

    1. Haopeng Zhao & Yuan Zhang & Jinghong Hu, 2023. "Investigation on Invasion Depth of Fracturing Fluid during Horizontal Fracturing in Low-Permeability Oil Reservoirs with Experiments and Mathematical Models," Energies, MDPI, vol. 16(13), pages 1-16, July.
    2. Yenan Jie & Jing Yang & Desheng Zhou & Haiyang Wang & Yi Zou & Yafei Liu & Yanjun Zhang, 2022. "Study on the Optimal Volume Fracturing Design for Horizontal Wells in Tight Oil Reservoirs," Sustainability, MDPI, vol. 14(23), pages 1-15, November.

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