Journal of Petroleum and Gas Engineering
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Article Number - 36254EC2775


Vol.1(2), pp. 16-25 , June 2010

ISSN: 2141-2677


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Full Length Research Paper

Analytical critical drawdown (CDD) failure model for real time sanding potential prediction based on Hoek and Brown failure criterion


Gbenga Folorunso Oluyemi1 * and M. Babs Oyeneyin2




 

1School of Engineering, Robert Gordon University, Schoolhill, Aberdeen, AB10 1FR, UK.

 2School of Engineering, Robert Gordon University, Schoolhill, Aberdeen, AB10 1FR, UK.


Email: [email protected]






 Accepted: 14 April 2010  Published: 30 June 2010

Copyright © 2010 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


 

The risks of failure in sand reservoirs and consequent sand production is now a stark reality in the upstream oil and gas industry. As a result, failure analysis of reservoir rocks for sanding potential prediction purposes has become a routine activity more than ever before. Owing to the huge economic, operational and safety implications of risks of sand failure, the efficient management of these risks for field operation optimization requires a reliable failure model, which can capture the failure processes adequately in real time. Mohr coulomb failure criterion has been more widely applied for rock mechanics problems relating to sand failure analysis and production in the oil industry and elsewhere, and has been used as the basis or platform for more than 80% of the failure models being used in the industry today for rock failure analysis and sanding potential prediction.  The major reasons for this could be attributed to: (a) Simplicity in understanding and use and (b) Description by a simple mathematical expression.  The mathematical expression of Mohr Coulomb criterion defines shear stress as a linear function of the normal stress, which is depictive of a linear failure envelope. In addition Mohr Coulomb is only applicable to intact rocks and cannot be applied to already failed rock. Failure envelope in petroleum formation rock has however been proved to be non-linear and as such Mohr Coulomb failure criterion and the models based on it cannot be trusted to capture the failure processes adequately and reliably. In this study, Hoek and Brown failure criterion has been used as a platform to develop a new time-coupled analytical failure model for the analysis of sanding potential prediction in real time. The basis for using the Hoek and Brown failure criterion lies in its ability to capture rock failure as a non-linear process and applicability to both intact and failed rocks.  This model has been tested and validated on some field data; in addition, it has been compared with another Mohr Coulomb-based drawdown failure model. The results obtained from the testing and validation scheme are very encouraging and show that Hoek and Brown criterion can indeed help overcome the inherent problems in Mohr Coulomb criterion

 

Key words: Rock failure, sand prediction, failure criteria, critical drawdown, failure envelope, uniaxial compressive strength (UCS).


APA (2010). Analytical critical drawdown (CDD) failure model for real time sanding potential prediction based on Hoek and Brown failure criterion. Journal of Petroleum and Gas Engineering, 1(2), 16-25.
Chicago Gbenga Folorunso Oluyemi  and M. Babs Oyeneyin. "Analytical critical drawdown (CDD) failure model for real time sanding potential prediction based on Hoek and Brown failure criterion." Journal of Petroleum and Gas Engineering 1, no. 2 (2010): 16-25.
MLA Gbenga Folorunso Oluyemi  and M. Babs Oyeneyin. "Analytical critical drawdown (CDD) failure model for real time sanding potential prediction based on Hoek and Brown failure criterion." Journal of Petroleum and Gas Engineering 1.2 (2010): 16-25.
   
DOI https://doi.org/
URL http://academicjournals.org/journal/JPGE/article-abstract/36254EC2775

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