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    Liquid loading in wellbores and its effect on cleanup period and well productivity in tight gas sand reservoirs

    152952_152952.pdf (863.2Kb)
    Access Status
    Open access
    Authors
    Bahrami, H.
    Rezaee, M. Reza
    Rasouli, Vamegh
    Hosseinian, A.
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Bahrami, H. and Rezaee, M. Reza and Rasouli, V. and Hosseinian, A. 2010. Liquid loading in wellbores and its effect on cleanup period and well productivity in tight gas sand reservoirs. APPEA Journal. 50.
    Source Title
    APPEA Journal
    ISSN
    13264966
    School
    Department of Petroleum Engineering
    Remarks

    First published in the APPEA Journal in 2010

    URI
    http://hdl.handle.net/20.500.11937/40971
    Collection
    • Curtin Research Publications
    Abstract

    Tight gas reservoirs normally have production problems due to very low matrix permeability and significant damage during well drilling, completion, stimulation and production. Therefore they might not flow gas to surface at optimum rates without advanced production improvement techniques. After well stimulation and fracturing operations, invaded liquids such as filtrate will flow from the reservoir into the wellbore, as gas is produced during well cleanup. In addition, there might be production of condensate with gas. The produced liquids when loaded and re-circulated downhole in wellbores, can significantly reduce the gas pro-duction rate and well productivity in tight gas formations.This paper presents assessments of tight gas reservoir productivity issues related to liquid loading in wellbores using numerical simulation of multiphase flow in deviated and horizontal wells. A field example of production logging in a horizontal well is used to verify reliability of the numerical simulation model outputs. Well production performance modelling is also performed to quantitatively evaluate water loading in a typical tight gas well, and test the water unloading techniques that can improve the well productivity. The results indicate the effect of downhole liquid loading on well productivity in tight gas reservoirs. It also shows how well cleanup is sped up with the improved well productivity when downhole circulating liquids are lifted using the proposed methods.

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