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Vol.22, No.2, 2022, pp. 143–150 |
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CORRELATION BETWEEN PICKUP WEIGHT, SLACK-OFF WEIGHT, AND ROTATION STRING WEIGHT IN VERTICAL AND DIRECTIONAL WELLS Mohamed Sobhy I. Elsayed1, Taher El-Fakharany1, Osama I. Hassanein Hassan2, Igor Martić3*, Nathalia Neves4 1) Petroleum Department, Al-Azhar University, Faculty of Engineering, Cairo, EGYPT 2) Electromechanical Engineering Technology Institute of Applied Technology, Abu Dhabi Polytechnic, UNITED ARAB EMIRATES 3) University of Belgrade, Innovation Centre of the Faculty of Mechanical Engineering, Belgrade, SERBIA email: igor.martic@ymail.com 4) Global Corporate Solutions, BRAZIL |
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Abstract Drilling activities in the oil and gas industry are capital-intensive and associated with high technology. With these assets, pickup weight, slack-off weight, and rotation string weight analyses are very important to ensure mechanical integrity of drillstring. Any form of interaction between the parties involved in drilling operation problems requires clear regulation regarding weight indicator relationships. This study attempts to make correlation between pickup weight, slack-off weight, and rotation string weight in vertical and directional wells in order to assess its applicability to other conditions. The search covers the key aspects of weight theory, provides a classification of weight in drilling operation, and discusses the correlation between three types of weight. It also considers the key principles of drag force, analyses of three types of weight in drilling operations by using the well data and highlights the shape of each well. Keywords: pickup weight (PUW), slack-off weight (SOW), rotation string weight (ROW), vertical well, deviated well |
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