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)

Getting the books fundamentals of drilling engineering now is not type of challenging means. You could not deserted going taking into account ebook stock or library or borrowing from your contacts to log on them. This is an very easy means to specifically acquire lead by on-line. This online statement fundamentals of drilling engineering can be one of the options to accompany you subsequently having further time.

Fundamentals of drilling engineering

Foam is one of the most widely used energized fluids in petroleum industry at fracturing and drilling operations. The influence of bubble size and texture on foam rheology has been observed for years. However, no mathematical description has been introduced yet. This study aims to consider the effects of bubble size and texture in determining the rheological parameters. Rheological analysis using digital image processing techniques and conventional methods are compared using information acquired from a developed set-up. It has been observed that by using digital image processing techniques, the rheological parameters of foam could be determined accurately.

Image Processing Techniques in Foam Characterization

This study concentrates on the use of materials known as hollow glass spheres, also known as glass bubbles, to reduce the drilling fluid density below the base fluid density without introducing a compressible phase to the wellbore Four types of lightweight glass spheres with different physical properties were tested for their impact on rheological behavior, density reduction effect, survival ratio at elevated pressures and hydraulic drag reduction effect when mixed with water based fluids A Fann75 HPHT viscometer and a flow loop were used for the experiments Results show that glass spheres successfully reduce the density of the base drilling fluid while maintaining an average of 093 survival ratio, the rheological behavior of the tested fluids at elevated concentrations of glass bubbles is similar to the rheological behavior of conventional drilling fluids and hydraulic drag reduction is present up to certain concentrations All results were integrated into hydraulics calculations for a wellbore scenario that accounts for the effect of temperature and pressure on rheological properties, as well as the effect of glass bubble concentration on mud temperature distribution along the wellbore The effect of drag reduction was also considered in the calculationsCopyright © 2014 by ASME

Density and Drag Reduction With Hollow Glass Additives

A Novel Practical Approach to Borehole Breathing Investigation in Naturally Fractured Formations

On the Instability of Cement-Fluid Interface and Fluid Mixing


 This study aims to provide the design and calculation method of key parameters in bullheading/PMCD operations. An improved gas migration velocity model in closed well conditions was developed based on the combination of the equation of motion (bubble flow) and Taylor bubble correlation (slug flow). A detailed derivation of the model can be found in our companion work (Liu et al. 2023). Experiments of Taylor bubble countercurrent behavior in an eccentric 6 in. × 4 in. annulus were conducted. Fluid rheology, annulus inclination, and internal pipe rotational speed were varied to provide a clearer understanding of Taylor bubble physics under non-Newtonian countercurrent flow and its implications for effectively managing upward gas migration that can occur in a wellbore during drilling operations in fractured or vugular rock formations. Computational Fluid Dynamics (CFD) simulations were performed to estimate the velocity of Taylor bubble in vertical annuli with downward fluid flow and a new closure relation for distribution parameter, C0, was proposed. The drift flux model embedded in the new gas migration velocity model was applied to simulate the dynamics of bullheading/PMCD. Good agreement between the model and published data was obtained. The effect of different bullheading rates on surface pressure and gas fraction in PMCD operation was examined.

Evren Ozbayoglu

Papers

Image Processing Techniques in Foam Characterization

Density and Drag Reduction With Hollow Glass Additives

A Novel Practical Approach to Borehole Breathing Investigation in Naturally Fractured Formations

On the Instability of Cement-Fluid Interface and Fluid Mixing

Design and Calculation of Process Parameters in Bullheading and Pressurized Mud Cap Drilling