As the hydrocarbon reserves are progressively depleted, the way to find hydrocarbon is much more complicated than ever by having a number of restrictions such as environmental issues, surface location, well proximity, and so forth. It is no surprise that the well planning process nowadays is very challenging. The torque limitation of the equipment is one of the constraints. During well planning, a prediction by sophisticated engineering software is required to ensure that the drilling torque would be within the limit. However, many wells drilled in the past have suffered with excessive torque, causing unusable wells or eventually unfeasible projects. This raises a disconcerting question whether the root cause originated from the software or the engineers. No matter what the answer is, the key is to understand the root cause and how to prevent it.

Therefore, first and foremost, this project will address the nature of the torque in the drilling operation in cooperation with a mathematical approach to describe torque behaviour. Secondly, torque simulation is very useful but also perilous. The difficulties lie in how much insight the engineers have into which software modelling or input is crucial in which circumstances. For this, a study of well design parameters including well architecture, drill pipe selection, BHA type, drilling fluid and tortuosity, will elaborate the extent to which these variables have influences on the torque by utilizing torque and drag software in a controlled environment together with an analysis of the actual field data. Last but not least, well planning optimization and external resources are also integrated as a guideline for future usages.

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