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Published in:
2015 | OriginalPaper | Chapter
4. Asset Operations: Non-productive Times During Oil Well Drilling
Authors : Joe Amadi-Echendu, Audu Enoch Yakubu
Published in: Proceedings of the 7th World Congress on Engineering Asset Management (WCEAM 2012)
Publisher: Springer International Publishing
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Abstract
Weather, well bore characteristics, tools and equipment failures, and other sources of risk aggregate into non-productive times (NPT) which, in turn, adversely impact on the efficiency and costs of drilling crude oil wells. The imperative is to increase efficiency and reduce the cost of drilling operations, especially for offshore locations where the high temperature and pressure conditions mean that the window between reservoir pore pressures and fracture gradients can be quite narrow. By analyzing data on drilling rigs from three operators, the paper provides insight into some of the prevalent reasons why NPT account for more than 30 % of the budget for oil well construction in the geographical area under study.