Research on Seepage Characteristics at Rock Core Scale of Tight Sandstone Gas Reservoir

Fuxi Liu

《International Core Journal of Engineering》 7卷12期 (2021/12) Pp. 358-367

https://doi.org/10.6919/ICJE.202112_7(12).0047

摘要

With respect to the special seepage rules of tight sandstone gas reservoir which is different from conventional gas and its non-linear seepage characteristic, this paper takes Sulige block as the research object, analyzes the influence of seepage characteristics on capacity from aspect of seepage characteristic experiment, and manifests the gas-water flow condition of tight sandstone gas reservoir with stress sensitivity coefficient, starting pressure gradient, permeability jail, relative permeability curve, etc. The results show that the water saturation has a much greater influence on gas phase flow in tight sandstone than the gas phase flow in medium and high sandstone; the change of porosity and permeability has a significant influence on permeability jail; the target block has a stress sensitivity which is stronger at the beginning of effective stress loading, greatly damaging the permeability.

關鍵字

Seepage characteristic ； tight sandstone ； starting pressure ； stress sensitivity

參考文獻

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