Characterization and Modeling of Unconventional Tight Reservoirs based on Fluid Flow Mechanisms

  • Rabab Ali Mah’d Qaddoura

    Student thesis: Master's Thesis

    Abstract

    The demand for a tool to predict transport phenomena in petroleum unconventional tight reservoirs is placing more severe demand on creating more realistic models that overcome the assumptions made by the currently used viscous and inertial dependent models. Fluid flow in unconventional reservoirs is governed by several mechanisms such as viscous, diffusion, advection, sorption, capillary and inertial forces, where they act in different domains; macro, micro and Nano-pore scales. Previously, diffusion forces have been considered insignificant when it comes to conventional reservoirs fluid flow models, where it was believed that transport of fluids was mainly dominated by viscous forces. This assumption is questioned in this work. This thesis work strongly believes that the role of diffusion forces cannot be neglected in the case of unconventional reservoirs of very tight mediums. Through this work, a new diffusive term is added to an existing fluid flow model that operates both viscous and inertial forces; Forchheimer's flow equation. This new term is a modified Fick's 1st Law. It counts for the flow velocity caused by the diffusion process. Using the threeterm model as a rate equation, in addition to the continuity equation and the Equation of State, a new model (a form of partial differential equation) has been developed. It works ideally in tight unconventional oil reservoirs. It has been numerically solved and tested. It is expected that the new model will receive wide application in predication of fluid flow through unconventional tight reservoirs. Further work includes building a comprehensive model based on thorough understanding of fluid flow complexities of UCRs.
    Date of AwardMar 2020
    Original languageAmerican English

    Keywords

    • Unconventional reservoirs
    • Forchheimer’s equation
    • Diffusion.

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