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Purpose of the study: This study aims to arrive at a new conceptual model of team roles that minimizes the weaknesses and maximizes the strengths of the prominent existing models. This study attempts to connect the new conceptual model of team roles with the five-factor model of personality. Methodology: Prominent existing models of team roles were compared and contrasted amongst themselves. Each model was carefully studied to identify underlying strengths and weaknesses. A comprehensive list of team roles with definitions from each model was put together. The list was carefully examined to identify team roles that can be merged or eliminated. A new model was conceptualized by merging and eliminating team roles wherever necessary. Main Findings: Each of the prominent existing models reviewed missed some critical aspects when contrasted with each other. There is a duplication of roles in some models while some important roles are missing in other models. A more comprehensive conceptual model has been proposed. Applications of this study: The conceptual model proposed in this study can be further tested and developed to create team role inventories. This model can be useful for team building in organizations of all kinds. The model would help in identifying the right members for a new team as well as in predicting outcomes of intact teams. Novelty/Originality of this study: The new conceptual model of team roles proposed in this study connects with the contemporarily relevant five-factor model of personality. This makes it different from previously existing models. The proposed model encompasses the strengths and avoids the weaknesses of past models.

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Drilling the 8½” x 10-5/8″ x 12¼” S-shaped wellbore through soft unconsolidated formation and highly compartmentalized reservoir offshore East Malaysia is exceptionally challenging. Previously, the operator has drilled a similar hole opening section in this marginal field with two separate runs. The directional requirements combined with low WOB took the operator three days to drill and open the 640m section. For the new drilling campaign, the reservoir objectives were to drill deeper and to appraise the well, with an option to complete and produce the gas reservoirs if there are any discoveries. The operator requested the hole be drilled with hole enlargement while drilling (HEWD) tools in a single run, with real-time logging tools. This technique would eliminate the requirement for extra 8½” pilot hole thus significantly reduce rig-days. Designing a robust and durable BHA for the 1370m long directional run demands intricate planning. To ensure the three cutting structures would synchronize and work in harmony, a pre-job FEA-based modeling system was used to investigate the dynamic drilling behavior of the BHA. The results of simulations from the initial BHA predicted very high vibrations which could potentially result in tool damage. A BHA optimization analysis was then conducted to enhance the BHA design to eliminate vibration issues. The simulation results of the optimized BHA design exhibited measurable reduction in vibration levels. The operator implemented the recommended BHA and a total of 1371m was successfully drilled and opened in one run, in just four days. All directional requirements were met and a good set of survey and log data was transmitted up the well without issues. Compared with the traditional two run approach, the single run yielded a 25% time savings to the operator. No vibrations were recorded and the BHA was pulled at section TD with no significant wear on the three cutting structures. There were no issues running casing, which implies good borehole quality.