Overbalanced drilling is the most common drilling technique; nevertheless, it has several
disadvantages such as formation damage, mud losses, and stuck pipes; challenges that are …

This paper presents a state of the art measurement and imaging systems used to determine
the Gas Void Fraction (GVF) of two-phase flow through annuli. Several research works were …

Riser gas events appear during offshore drilling operations when there is a presence of gas
in a marine riser above the subsea BOP, which has been recognized as a hazardous …

We propose a simple model of two-phase gas–liquid flow by imposing a quasi-equilibrium
on the mixture momentum balance of the classical transient drift-flux model. This reduces the …

The ability to perform accurate pore pressure and reservoir inflow estimation during a kick
incident is necessary, particularly when drilling in formations with narrow pressure margins …

The drilling industry has substantially improved performance based on knowledge from
physics-based, statistical, and empirical models of components and systems. However, most …

Abstract The Influx Management Envelope (IME) is a proven tool to assess management of
influxes taken during MPD operations. Currently, IME establishes limits of manageable influx …

Two-phase flows are frequently modelled and simulated using the Two-Fluid Model (TFM)
and the Drift Flux Model (DFM). This paper proposes Stokes–Dirac structures with respect to …

This work evaluates the use of non-linear model predictive control (NMPC) for multivariate
control of pressure and flow during underbalanced drilling (UBD) using a fit-for-purpose …

We solve the problem of stabilizing a general class of linear first-order hyperbolic systems
using actuation at both boundaries of the spatial domain. We design a novel Fredholm …