Pressure-transient-analysis of horizontal wells with transverse, finite-conductivity fractures

M. Al-Kobaisi, E. Ozkan, H. Kazemi, B. Ramirez

    Research output: Contribution to conferencePaperpeer-review

    31 Scopus citations

    Abstract

    This paper discusses the analysis of pressure-transient responses of horizontal wells intercepting finite-conductivity transverse fractures. We use a hybrid, numerical-analytical model to simulate the impact of the fracture properties on the early-time flow regimes and pressure transient characteristics of fractured horizontal wells. It is shown that the fracture geometry and well location strongly influence the flow convergence in a horizontal-well fracture and lead to early-time flow regimes different from vertical-well fractures. Accordingly, appropriate pressure-transient models and analysis procedures should be used to determine fracture properties. We present straight-line analysis equations for radial-linear and pseudo-bilinear flow regimes for circular and rectangular fractures, respectively. We also bring the conventional fracture half-length and conductivity concepts into perspective and question the assumption that the properties estimated from pressure-transient tests of horizontal-well may be taken as effective properties when fractures are not rectangular. We show that flow convergence toward the wellbore may increase non-Darcy flow within the fracture. If the additional pressure drop because of flow choking and non-Darcy flow is not taken into account, pressure-transient tests indicate smaller effective conductivity or fracture size. Because this additional pressure-drop is flow rate dependent, the estimated effective fracture properties are not useful for performance prediction purposes.

    Original languageBritish English
    DOIs
    StatePublished - 2006
    EventCanadian International Petroleum Conference, CIPC 2006 - Calgary, Canada
    Duration: 13 Jun 200615 Jun 2006

    Conference

    ConferenceCanadian International Petroleum Conference, CIPC 2006
    Country/TerritoryCanada
    CityCalgary
    Period13/06/0615/06/06

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