ArticleACS omega2026
Optimization and Threshold of Soaking Time in Fracturing-Driven Huff-n-Puff for Tight Reservoirs Based on Dynamic Capillary Force.
Article in ACS omega, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
In recent years, oil and gas development has gradually shifted toward low-permeability, tight, and difficult-to-produce unconventional reservoirs. Due to the difficulty of energy replenishment via water injection in such reservoirs, fracturing-driven huff-n-puff (FDHP) technology has emerged as a key technique for their efficient development. Tight reservoirs are characterized by fine pore throats and complex pore structures, and the dynamic capillary force effect during the shut-in period can significantly influence fluid seepage behavior. However, most existing studies on shut-in time optimization are based on the static capillary force assumption, which fails to accurately characterize the actual features of unsteady-state spontaneous imbibition processes. In this study, dynamic capillary forces during production in reservoirs with different permeabilities were experimentally measured, and the evolution of the pseudodynamic coefficient with water saturation was revealed. Based on a macroscopic characterization model of the dynamic capillary force effect, combined with the flow characteristics of surfactant solution and crude oil in porous media, a single-well matrix-fracture coupled shut-in production model was constructed. Production simulations were conducted on well T-1, an FDHP well in the Daqing Oilfield. The production performance and remaining oil distribution under different shut-in durations were analyzed using the proposed model, and the effects of bottomhole flowing pressure, crude oil viscosity, reservoir permeability, and oil-water interfacial tension on shut-in time were investigated. The results show that under permeability ranging from 0.81 to 20.31 × 10
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