With the development of different segments within the drilling technology in the last three
decades, well drilling has become possible in harsh downhole conditions. The vertical well …

All the oil and natural gas wells from underground reservoirs to the surface resemble flow
loops. Over the past couple of decades, a variety of flow loops have been established in …

Increasing cuttings bed height is a serious concern during extended-reach well drilling. In
order to predict and prevent cuttings bed height increase, it is essential to study how the …

Cuttings transport is a topic of great interest in the oil and gas drilling industry. Insufficient
cuttings transport leads to several expensive problems. Knowledge and selection of the …

Drill pipe rotation is considered a relevant factor for cuttings transport and hole cleaning.
However, in the term “rotation” is often used as a moniker for the combination of plain drill …

Hole cleaning and cuttings transport play a vital role in the drilling operation. Various drilling
problems such as a reduction in penetration rate, an increase in the torque and drag, and an …

The cuttings transport during well drilling was numerically simulated based on kinetic theory
of granular flow in combination with sliding mesh for drill pipe rotation. The power-law model …

Pneumatic conveying theory is applied to the negative pressure sampling for the gas content
determination in coal seams. Herein, we investigated the gas-solid flow in the drill pipe with …

In oil and gas drilling operations, predictions of pressure losses and cuttings concentration
in the annulus are very complex due to the combination of interacting drilling parameters …

The problem of solids cleanout in horizontal wellbores was studied experimentally. The
special case of drilling-fluid circulation with no inner-pipe rotation was considered. This case …