Single- and Two-Phase Flow Models for Concentric Casing Underbalanced Drilling

  • J. Omar Flores-LeónEmail author
  • Octavio Cazarez-Candia
  • Rubén Nicolás-López
Part of the Environmental Science and Engineering book series (ESE)


Underbalanced Drilling process (UBD) is applied to oil fields where the original pressure has been depleted as a consequence of an intensive exploitation. In such technique, due to the incorporation of nitrogen into the Drilling Fluid (DF), the downhole pressure is close to the reservoir pressure. This work presents a single-phase, one-dimensional and transient mathematical model for the flow of: (1) nitrogen in an annulus, and (2) DF in a drill pipe. It is also presented a one-dimensional, transient, mathematical drift-flux model for the DF-gas two-phase flow in an annulus. The mathematical models are based on the mass, momentum and energy conservation equations, which are solved numerically using the finite difference technique in an implicit scheme. The models allow predicting pressure, velocity and temperature profiles. The predictions are in agreement with experimental and field data reported in the literature.


Void Fraction Drilling Fluid Superficial Velocity Energy Conservation Equation Bottomhole Pressure 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • J. Omar Flores-León
    • 1
    Email author
  • Octavio Cazarez-Candia
    • 2
  • Rubén Nicolás-López
    • 2
  1. 1.Facultad de IngenieríaUniversidad Nacional Autónoma de MéxicoMexicoMexico
  2. 2.Instituto Mexicano del PetróleoMexicoMexico

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