The effect of stress arching on the permeability sensitive experiment in the Su Lige gas field

Fanliao Wang, Xiangfang Li, Gary Douglas Couples, Mingchuan Wang, Yiqun Zhang, Jingjing Zhao

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    Comparing with the high permeability reservoir, low permeability reservoir was more sensitive to the effective stress and current stress sensitive experiment assumed that the overburden pressure unchanged during the production. In fact, the overburden pressure reduced during the production due to the stress arching effect and it is easy to form an arch in the overburden when the reservoir was small and softer than the surrounding rock. Based on the theory of stress arch, Arching ratios and overburden pressures in the Su Lige gas field were calculated and this theory was the first time to be applied in the stress sensitive experiments. The experiments considered the shapes of the reservoirs. The shapes of the reservoirs in the Su Lige gas field were classified as the Penny shape and the Elliptic cylinder reservoirs. The arching ratios were 0.12 and 0.28, respectively, for the Elliptic cylinder reservoirs and the Penny shape reservoirs. The permeabilities with stress arch were much larger than those obtained from the routine experiments. The increase proportions of the permeability were related to the arching ratios. The permeabilities increased by 23% and 50%, respectively, for the Elliptic cylinder reservoir and the Penny- shape reservoir with the pressure drop of 25Mpa. The routine sensitive experiments exaggerated the degree of permeability stress sensitivity.
    Original languageEnglish
    Title of host publicationVibroengineering Procedia
    Place of PublicationKaunas, Lithuania
    PublisherJVE International
    Pages158-163
    Number of pages6
    Volume2
    Publication statusPublished - 2013
    EventInternational Conference Vibroengineering - Druskininkai, Lithuania
    Duration: 17 Sep 201319 Sep 2013

    Conference

    ConferenceInternational Conference Vibroengineering
    CountryLithuania
    CityDruskininkai
    Period17/09/1319/09/13

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