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Article

Research on the Optimization of the Volume Fracturing Shut-in and Drainage System of Unconventional Reservoirs in the Erlian Block

1
Oil and Gas Technology Research Institute, Huabei Oilfield Company, China Petroleum, Renqiu 062552, China
2
School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
3
Hebei Province Key Laboratory for Reservoir Transformation of Low-Seepage and Ultra-Low-Seepage Oil and Gas Reservoirs, Renqiu 062552, China
*
Author to whom correspondence should be addressed.
Processes 2025, 13(10), 3258; https://doi.org/10.3390/pr13103258 (registering DOI)
Submission received: 14 September 2025 / Revised: 10 October 2025 / Accepted: 11 October 2025 / Published: 13 October 2025
(This article belongs to the Special Issue Numerical Simulation and Application of Flow in Porous Media)

Abstract

Aiming at unclear imbibition replacement mechanisms and flowback/production strategies in unconventional reservoirs of the Erlian Block, this study proposes a systematic approach integrating “imbibition-flowback-productivity synergy” to optimize post-fracturing shut-in and production regimes. By developing numerical models incorporating geological and engineering factors, we analyzed fluid dynamics during both the shut-in and production phases. Concurrently, crude oil displacement-fracturing fluid imbibition replacement experiments were conducted to guide parameter optimization. The results indicate that optimized shut-in time and production rates substantially increase recovery efficiency while mitigating reservoir damage and proppant flowback. The well shut-in time of the Erlian Block can achieve the optimal shut-in replacement effect in about 20–25 days. The optimized flowback rate of the unconventional reservoir in the Erlian Block is 25–30 m3/d. The findings offer theoretical insights and practical recommendations for the efficient development of unconventional resources.
Keywords: unconventional reservoirs; hydraulic fracturing; shut-in optimization; production regime; numerical simulation unconventional reservoirs; hydraulic fracturing; shut-in optimization; production regime; numerical simulation

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MDPI and ACS Style

Li, N.; Ma, X.; Xu, L.; Long, C.; Liu, G.; Xiu, S.; Ma, H. Research on the Optimization of the Volume Fracturing Shut-in and Drainage System of Unconventional Reservoirs in the Erlian Block. Processes 2025, 13, 3258. https://doi.org/10.3390/pr13103258

AMA Style

Li N, Ma X, Xu L, Long C, Liu G, Xiu S, Ma H. Research on the Optimization of the Volume Fracturing Shut-in and Drainage System of Unconventional Reservoirs in the Erlian Block. Processes. 2025; 13(10):3258. https://doi.org/10.3390/pr13103258

Chicago/Turabian Style

Li, Ning, Xinfang Ma, Liu Xu, Changjun Long, Guohua Liu, Shuzhi Xiu, and He Ma. 2025. "Research on the Optimization of the Volume Fracturing Shut-in and Drainage System of Unconventional Reservoirs in the Erlian Block" Processes 13, no. 10: 3258. https://doi.org/10.3390/pr13103258

APA Style

Li, N., Ma, X., Xu, L., Long, C., Liu, G., Xiu, S., & Ma, H. (2025). Research on the Optimization of the Volume Fracturing Shut-in and Drainage System of Unconventional Reservoirs in the Erlian Block. Processes, 13(10), 3258. https://doi.org/10.3390/pr13103258

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