An Analysis of Formation Damage During the Drilling of Deviated Wells

Filtrate losses and filter cake properties of drilling fluids are of concern in the oil industry because they alter near wellbore permeability and can reduce well productivity. Therefore, it is desirable to accurately characterize filtration process during oil well drilling. A mathematical model for...

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Bibliographic Details
Published in:Petroleum science and technology 2013-11, Vol.31 (21), p.2202-2210
Main Authors: Akinsete, O. O., Isehunwa, S. O.
Format: Article
Language:English
Subjects:
Applied sciences
Cakes
Crude oil, natural gas and petroleum products
Damage
deviated well
Drilling
Drilling fluids
Drilling methods and equipments. Rocks mechanics. Directional and horizontal drilling
Drilling. Casing. Preparing wells for production
Energy
Exact sciences and technology
filter cake
Filtration
formation damage
Fuels
mathematical model
Mathematical models
Mud
mud filtration
Prospecting and production of crude oil, natural gas, oil shales and tar sands
Wells
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Summary:Filtrate losses and filter cake properties of drilling fluids are of concern in the oil industry because they alter near wellbore permeability and can reduce well productivity. Therefore, it is desirable to accurately characterize filtration process during oil well drilling. A mathematical model for analyzing mud filtration in deviated wells was developed in this study. The model determined solid pressure distribution within cake, cake thickness, cumulative volume of filtrate, and extent of invasion under different conditions. Results show assumptions of isotropy in previous studies greatly overestimate the magnitude of the damage. It was also confirmed that mud filtration tend to be higher in deviated than in vertical wells. The model was validated with experimental data.
ISSN:1091-6466
1532-2459
DOI:10.1080/10916466.2011.563253