An overview of the self-organizing map algorithm, on which the papers in this issue are based, is presented in this article.

The Self-Organizing Map

Hydrodynamic and hydromagnetic stability

CFD–DEM approach to investigate the effect of drill pipe rotation on cuttings transport behavior

Real time prediction of drilling fluid rheological properties using Artificial Neural Networks visible mathematical model (white box)

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Fundamentals of drilling engineering

The Effects of Drillstring-Eccentricity, -Rotation, and -Buckling Configurations on Annular Frictional Pressure Losses While Circulating Yield-Power-Law Fluids

Dynamic stress distribution around the wellbore influenced by surge/swab pressure

The annular frictional performance of non-Newtonian fluids is among the major considerations during development of hydraulic programs for drilling operations Proper estimation of the frictional pressure losses become more critical when determining hydraulic horsepower requirements and selecting proper mud pump systems to foresee any serious problems that might occur with hydraulics during drilling operations Because the rheological behaviour of the non-Newtonian fluids is known to be challenging, it becomes even more complicated during pipe rotation, especially in eccentric wellbores In many cases, significant differences are observed when theoretical calculations and measurements for pressure losses are compared This study aims to develop correction factors for determining the frictional pressure losses accurately in eccentric horizontal annulus for non-Newtonian fluid, including the effect of pipe rotation Extensive experimental work has been conducted on METU-PETE Flow Loop for numerous non-Newtonian drilling fluids, including KCl-polymer muds and PAC systems for different flow rates and pipe rotation speeds, and frictional pressure losses are recorded during each test Rheological characteristics of the drilling fluids are determined using a rotational viscometer Observations showed that pipe rotation has a significant influence on frictional pressure loss, especially at lower flow rates Up to a point, as the pipe rotation increases, the frictional pressure losses also increase As the flow rates are increased, the effect of pipe rotation on frictional pressure losses diminishes Also, after a certain pipe rotation speed, no additional contribution of pipe rotation on frictional pressure loss is observed When the developed friction factors are used, there is a good agreement between the calculated and observed frictional pressure losses for any pipe rotation speed

Evren Ozbayoglu

Papers

The Effects of Drillstring-Eccentricity, -Rotation, and -Buckling Configurations on Annular Frictional Pressure Losses While Circulating Yield-Power-Law Fluids

Dynamic stress distribution around the wellbore influenced by surge/swab pressure

Frictional Pressure Loss Estimation of Non-Newtonian Fluids in Realistic Annulus With Pipe Rotation

Cuttings Transport with Foam in Horizontal & Highly-Inclined Wellbores

Poroelastic modeling of cutting rock in pressurized condition