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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)


Article Title: Engineering Management and Inspection Schedule of Petroleum Well Integrity
by Musaed N. J. AlAwad and Hawwas A. Mohammad

Oil and gas supply the world with energy by approximately 60% of all available energy sources. The global hydrocarbon well inventory accounts for at least 1.8 million wells, more than 870,000 wells of these wells are active. Wells must be designed to ensure well integrity, i.e. that the fluids stay contained within the wellbore, and that the surrounding subsurface layers, including aquifers, are protected. Well integrity is a result of technical, operational and organizational barriers applied, with the intention to contain and control the reservoir fluid and well pressures. Failure to obtain and maintain adequate well integrity (barriers) could lead to catastrophic events, like demonstrated in the Gulf of Mexico in 2010, with the Deepwater Horizon incident. Well integrity failures hit a company hard at every level. Hydrocarbon production is affected, individuals may be hurt and environmental disaster is a potential risk. Therefore, well integrity can be defined as the sustainability of the equipment to operate safely for the full design life. For an oil/gas well to maintain its integrity and be produced effectively and economically, it is pertinent that a complete zonal isolation is achieved through out the life of the well. This complete zonal isolation, however, can be compromised due to factors that come into play during the operative life of the completed well. In this study, the typical well integrity primary and secondary barriers are outlined in details. Examples of Worldwide incidents due to well integrity failure are presented. An appreciable statistical data on well integrity failures worldwide are presented and analyzed. Furthermore, risks associated with different types of well integrity failure issues and how to reduce/mitigate them are discussed. Procedures, roles and responsibilities of personnel involved in the well lifecycle towards well integrity are presented. Finally, a holistic Well Integrity Barriers Inspection Schedule for use by the oil and gas producing companies worldwide are developed. This paper provides the oil industry society with a clear picture on the elements of petroleum well integrity; a general well integrity inspection schedule; and a risk based inspection and maintenance matrix.
Keywords: well integrity management (WIM), well barriers (WBs), well barrier element (WBE), well barrier failure frequency, Well Integrity Inspection Schedule
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom



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