Two phase flow modelling on realistic discrete fracture models

Nikolai Andrianov, Hamid Nick

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    Abstract

    We analyze the waterflood performance using an outcrop-based model, representative of North Sea fractured chalk reservoirs. To this end, we consider published data on the fracture geometry of Lägerdorf quarry in northern Germany and create a two-dimensional Discrete Fracture-Matrix (DFM) outcrop-based model, popu- lated with the rock and fluid properties, typical for North Sea oil reservoirs. We conduct several DFM simulations to study the dependency of oil recovery factor
    with respect to water injection rate under uncertainty in fracture apertures and orientations, using both sea and low salinity water as injection fluids. Based on simulation results, we show that if there is a noticeable impact of fractures on the flow, the slower injection rates lead to higher recovery in terms of water pore volumes injected. The main factor influencing the recovery efficiency is whether there is a direct communication between the inflow and outflow boundaries via highly conductive fractures. However, if the fractures’ apertures in the direct communication path are small enough, the capillary forces can counterbalance the viscous displacement in fractures thus leading to better recovery. We demonstrate that commonly used statistical measures of fractures orientation and connectivity cannot predict this type of behavior
    Original languageEnglish
    Publication date2019
    Publication statusPublished - 2019
    EventDanish Hydrocarbon Research and Technology Centre
    Technology Conference 2019
    - Comwell Kolding, Kolding, Denmark
    Duration: 5 Nov 20196 Nov 2019
    https://dhrtc.easysignup.com/16/

    Conference

    ConferenceDanish Hydrocarbon Research and Technology Centre
    Technology Conference 2019
    LocationComwell Kolding
    Country/TerritoryDenmark
    CityKolding
    Period05/11/201906/11/2019
    Internet address

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