Abstract Overbalanced drilling is the most common technique; nevertheless, it has several disadvantages such as formation damage, mud losses, and stuck pipes; challenges that are in high permeability zones highly fractured formations. To overcome those issues, underbalanced method could be implemented. The (UBD) technique widely utilized hard, under pressure, depleted, fractured/vuggy Low-densi...

This research investigates factors influencing cuttings transport efficiency in air drilling operations, aiming to understand the underlying mechanisms, identify critical factors, and optimize parameters for enhanced performance. The methodology includes a literature review, computational fluid dynamics (CFD) simulations, sensitivity analysis of velocity, properties, size, outlet pressure. CFD ...

Abstract Production logging tools (PLTs) and formation testing, even in while drilling (LWD) conditions during underbalanced drilling, are key technologies for assessing the productivity potential of a gas well therefore to maximize recovery. Gas bubble detection sensors components determining fluid phases reservoir accurately quantify recoverable reserves, optimize placement, geosteering quali...

In underbalanced drilling (UBD), the bottom hole pressure is kept below pore pressure, causing pressure-dependent influx of reservoir gas into wellbore that makes system unstable at low drawdowns. this article, we propose a feedback controller which stabilizes system, represented by “reduced drift flux model (DFM),” around an arbitrary setpoint, while using only topside measurement and assuming...