scispace - formally typeset
Search or ask a question
Author

Evren Ozbayoglu

Bio: Evren Ozbayoglu is an academic researcher from University of Tulsa. The author has contributed to research in topics: Drilling fluid & Pressure drop. The author has an hindex of 17, co-authored 98 publications receiving 894 citations. Previous affiliations of Evren Ozbayoglu include Middle East Technical University.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, an elastodynamics model and a poroelastodynamic model have been established to overcome the deficiencies of the conventional method to calculate wellbore stress without considering the coupled effect of deformation-diffusion.

47 citations

Proceedings ArticleDOI
TL;DR: In this article, the authors developed correction factors for determining the frictional pressure losses accurately in eccentric horizontal annulus for non-Newtonian fluid, including the effect of pipe rotation.
Abstract: 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

46 citations

Journal ArticleDOI
TL;DR: In this paper, a cutting model based on the theory of linear poroelasticity was developed to predict coupled stresses and pore pressure in the rock and give a better understanding of the poro-elastic effect in the cutting process.

39 citations


Cited by
More filters
01 Jan 1990
TL;DR: An overview of the self-organizing map algorithm, on which the papers in this issue are based, is presented in this article, where the authors present an overview of their work.
Abstract: An overview of the self-organizing map algorithm, on which the papers in this issue are based, is presented in this article.

2,933 citations

Journal ArticleDOI
TL;DR: In this paper, a coupled Computational Fluid Dynamics and Discrete Element Method (CFD-DEM) approach is presented to simulate the cuttings transport considering the dynamic collision process.

122 citations

Journal ArticleDOI
TL;DR: In this paper, a mathematical model that obtained from the weights, biases, and the transfer functions used in the Artificial Neural Networks (ANNs) was converted to white box to obtain a visible mathematical model which can be used to predict the drilling fluid rheological properties only using Marsh funnel viscosity, solid content, and density.

121 citations

Book
01 Jan 2011
TL;DR: In this article, an online statement fundamentals of drilling engineering can be one of the options to accompany you subsequently having further time, which is an easy means to specifically acquire lead by on-line.
Abstract: 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.

112 citations