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    Stress Anisotropy, Long-Term Reservoir Flow Regimes and Production Performance in Tight Gas Reservoirs

    Access Status
    Fulltext not available
    Authors
    Bahrami, H.
    Rezaee, M. Reza
    Asadi, Mohammad Sadegh
    Date
    2010
    Type
    Conference Paper
    
    Metadata
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    Citation
    Bahrami, Hassan and Rezaee, M. Reza and Asadi, M. Sadegh. 2010. Stress Anisotropy, Long-Term Reservoir Flow Regimes and Production Performance in Tight Gas Reservoirs, SPE production and Operations conference, Oct 12 2010, pp. 1-12. West Virginia, USA: Society of Petroleum Engineers (SPE).
    Source Title
    Society of Petroleum Engineers
    Source Conference
    SPE production and Operations conference
    DOI
    10.2118/136532-MS
    School
    Department of Petroleum Engineering
    Remarks

    Copyright © 2010 Society of Petroleum Engineers (SPE)

    URI
    http://hdl.handle.net/20.500.11937/34963
    Collection
    • Curtin Research Publications
    Abstract

    Tight gas reservoirs normally have production problems due to very low matrix permeability and different damagemechanisms during drilling, completion and stimulation. Tight reservoirs need advanced drilling and completion techniques to efficiently connect wellbore to the formation open natural fractures and produce gas at commercial rates. Stress regimes have significant influence on tight gas reservoirs production performance. The stress regimes cause wellbore instability issues while drilling, which can result in large wellbore breakouts. The stress regimes can also control the well long-term production performance, since they affect permeability anisotropy. The preferred horizontal flow direction is expected to be parallel to the maximum in situ horizontal stress. The production and welltest data in non-fractured as well as hydraulically fractured wells in tight reservoirs have indicated the presence of a long-term linear flow regime due to the well and reservoir geometry and also as a result of the permeability anisotropy.The stress anisotropy leads to different permeabilities in different directions, and the natural fractures that are aligned with maximum horizontal stress; they might have larger aperture and greater permeability. Due to the more severe stress anisotropy in tight formations, permeability in maximum stress direction might significantly be larger than permeability in the direction of minimum stress. This study represents evaluation of parameters that might control well productivity and long-term well production performance in tight gas reservoirs. Geomechanical modeling is performed in order to understand the effect of stress anisotropy on aperture evolution of natural fractures in different directions. Furthermore, single well reservoir simulation study is performed in order to generate pressure build-up data for a typical tight gas reservoir, in order to evaluate effect of reservoir geometry and permeability anisotropy on late time linear flow regime, and also assess the well production performance for different well and reservoir conditions.

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