alexa Improved Model for Predicting Annulus Pressure Drop during Underbalanced Drilling
ISSN:2157-7463

Journal of Petroleum & Environmental Biotechnology
Open Access

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Review Article

Improved Model for Predicting Annulus Pressure Drop during Underbalanced Drilling

Fadairo Adesina Samson1*, Adeyemi Gbadegesin1, Bello Kelani2 and Olafuyi Olalekan2
1Department of Petroleum Engineering, Covenant University Ota, Nigeria
2Department of Petroleum Engineering, University of Benin, Nigeria
Corresponding Author : Fadairo Adesina Samson
Department of Petroleum Engineering
Covenant University Ota, Nigeria
E-mail: [email protected]
Received September 29, 2014; Accepted December 19, 2014; Published January 01, 2015
Citation: Fadairo AS, Adeyemi GA, Kelani B, Olafuyi O (2015) Improved Model for Predicting Annulus Pressure Drop during Underbalanced Drilling. J Pet Environ Biotechnol 6:203. doi:10.4172/2157-7463.1000203
Copyright: © 2015 Fadairo AS, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Most time during underbalanced drilling or cleaning of well, formation fluid (oil and water) influx is usually experienced as soon as productive zone is penetrated because formation pore pressure gradient are higher than hydrostatic pressure gradient. Successful flow of fine drilling cuttings and formation fluid (gas, oil and water) to the surface flow facilities therefore demands for accurate prediction of pressure drop along the well bore during underbalanced drilling. Previous studies on pressure profile prediction in the wellbore during underbalanced drilling have not taken into account the effect of cuttings volume. The purpose of this study is therefore to develop an improved model that predicts the effect of cuttings volume on annulus pressure drop in the wellbore during underbalanced drilling. This is an extension of Guo and Fadairo model for investigating the effect of cutting volume pressure drop during underbalanced drilling. The result of the study shows that the cutting flow rate increases with small pressure differential while it decreases with large pressure differential. This depicts that cutting retards fluid flow and increases bottom-hole pressure and fluid density, resulting in low fluid velocity and cutting lifting capacity of the drilling fluid. This may result in cutting accumulation, ultimately reducing the ability of the drilling fluid to effectively lift drill cuttings from bottom-hole to the surface and eventually lead into stuck drilling string.

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