Many drilling muds and crude oils are known to be thixotropic. Under a wide range of
pressures, temperatures and flow regimes, they display unusual complex flow properties …

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 …

The present paper is a review of various borehole cleaning parameters and rheological
properties of drilling mud which affects the cuttings transport. This parameter influences the …

Experimental measurements of the pressure losses in a well annulus are costly and time
consuming. Pressure loss calculations in annulus is generally conducted based on an …

The in-situ visualization of flow in the opaque pipes and annulus is a major cause of concern
for studying hole cleaning issues and multiphase flow patterns in the oil and gas industry …

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 …

The process of drilling a borehole is very complex, involving surface and downhole drilling
systems, which interact with the drilling fluid and the surrounding rocks. Modeling and …

It has been shown that drill pipe eccentricity can significantly reduce the annular pressure
losses and must be taken in to account for accurate prediction of equivalent circulating …

Reduction of proven gas and oil reserves and increasing demand for energy forces the
petroleum industry to drill deeper and more complicated wells. Drilling in these harsh …