Numerical modeling of fully coupled hydraulic fracture propagation in naturally fractured poroelastic reservoirs

M. M. Rahman, Ali Aghigi, Abdul Ravoof Sheik

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

    9 Scopus citations

    Abstract

    The effect of a pre-existing natural fracture on the extension of a hydraulically induced fracture has been modeled based on poro-elastic behavior. The approach of Warpiniski and Teufel was adopted to evaluate the fracture propagation that would occur after an induced fracture intersects an existing natural fracture. This two dimensional numerical model will simulate the interaction between an induced propagating fracture and natural fracture. The model departs radically from current models in that poro-elastic behavior is not used, uniform pressure inside the natural fracture was used in practice this is not true and effect of fracture toughness ignored. A modified leak-off model for intersecting fracture based on poro-elasticity is introduced as the leak-off is increased in the intersection. Besides these previous model used startup solution using PKN model. In this model a triple system of wellbore-fracture- formation is considered and the fracture will initiate first then propagate some extent then interact with natural fracture. A poro-elastic solution for the stresses in the interaction zone has been used as a basis for hydraulic/natural fracture interaction criteria. The criteria compares favorably with the experimental results. Comparison of the numerical results with experimental results has shown that the main effect of the natural fractures is the width constriction that occurs when the induced fracture propagates into the natural fracture. Numerical and experimental studies for such propagation indicate a near wellbore width and effective length reduction due to the additional normal stress acting on the plane of the induced fracture.

    Original languageBritish English
    Title of host publication71st European Association of Geoscientists and Engineers Conference and Exhibition 2009
    Subtitle of host publicationBalancing Global Resources. Incorporating SPE EUROPEC 2009
    Pages1859-1866
    Number of pages8
    StatePublished - 2009
    Event71st European Association of Geoscientists and Engineers Conference and Exhibition 2009 - Amsterdam, Netherlands
    Duration: 8 Jun 200911 Jun 2009

    Publication series

    Name71st European Association of Geoscientists and Engineers Conference and Exhibition 2009: Balancing Global Resources. Incorporating SPE EUROPEC 2009
    Volume3

    Conference

    Conference71st European Association of Geoscientists and Engineers Conference and Exhibition 2009
    Country/TerritoryNetherlands
    CityAmsterdam
    Period8/06/0911/06/09

    Keywords

    • Coupled fluid and poroelastic medium
    • Fracture geometry
    • Fracture interaction
    • Fracture orientation
    • Hydraulic fracturing
    • In-situ stress
    • In-situ stresses
    • Shear strength
    • Stress regime

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