Development and validation of an iteratively coupled geomechanics module for a compositional reservoir simulator, UTCOMP

Mahdi Haddad, Emad W. Al-Shalabi, Kamy Sepehrnoori

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    Pore pressure-stress analyses in stress-sensitive reservoirs investigate interactions between the in-situ stress and fluid flow; these interactions help or resist production, or conclude surface subsidence during production. Among the tools for these analyses, an iteratively coupled Geomechanics and fluid flow model provides an essential and reliable prediction for field planning and development. In this work, we implemented this model in an in-house, three dimensional, compositional reservoir simulator, UTCOMP, using modified Chin's iterative coupling method. This development integrated a stand-alone Geomechanics module based on finite element method with the reservoir simulator, an advantage of our coupling algorithm, and improved our understanding of the production through various enhanced oil recovery processes such as water and CO2 floodings previously coded in UTCOMP. Benefiting from the higher time scales of solution variations due to the Geomchanics module, we lowered the frequency of calling this computationally expensive module. Also, we reduced the order of the finite element shape functions from quadratic to linear, which majorly mitigated the high computational cost of our Geomechanics studies while we almost maintained the solution accuracy. To validate our implementation, we investigated a primary oil production case and compared the results from UTCOMP with those from two other simulators: 1) CMG software program using different coupling methods; and 2) another pre-validated in-house reservoir simulator, GPAS. Moreover, due to the lack of real field data, we validated our solutions for the enhanced oil recovery problems by comparing them with those from GPAS coupled with Geomechanics. We observed a minor discrepancy between the solutions at very early times which originates from the different structures in these two reservoir simulators, IMPEC in UTCOMP and fully implicit in GPAS.

    Original languageBritish English
    Title of host publicationSociety of Petroleum Engineers - SPE Reservoir Characterisation and Simulation Conference and Exhibition, RCSC 2015
    ISBN (Electronic)9781510813427
    StatePublished - 2015
    EventSPE Reservoir Characterisation and Simulation Conference and Exhibition, RCSC 2015 - Abu Dhabi, United Arab Emirates
    Duration: 14 Sep 201516 Sep 2015

    Publication series

    NameSociety of Petroleum Engineers - SPE Reservoir Characterisation and Simulation Conference and Exhibition, RCSC 2015

    Conference

    ConferenceSPE Reservoir Characterisation and Simulation Conference and Exhibition, RCSC 2015
    Country/TerritoryUnited Arab Emirates
    CityAbu Dhabi
    Period14/09/1516/09/15

    Keywords

    • Compositional reservoir simulator
    • Coupled pore pressure-stress analysis
    • Finite element method
    • Geomechanics
    • Modified Chin's iterative coupling

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