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Keywords

torque, drag, directional drilling, slim hole, casing while drilling, well trajectory

Document Type

Research Article

Abstract

Diferent locations and feld conditions require various drilling methods to produce oil and gas. Three major operational methods are identifed to be slim holes, conventional and casing drilling. Despite many afecting parameters, torque and drag are two highlighted factors for the determination of the best drilling method. Torque and drag play a signifcant role in the feasibility of drilling and its fnal costs. In this study, the infuence of the torque and drag are investigated for the determination of optimum drilling type in consideration of the same S-shape well trajectory for all cases. Consequently, slim hole drilling showed minimum torque and drag value which meant that this method can be a good choice. Furthermore, casing drilling displayed maximum torque and drag in this study resulting in high sensitivity to the high degree of deviation. On the other hand, due to the constant weight of casing while drilling, this method showed a smooth increasing trend in terms of drag force while slim hole and conventional drilling showed signifcant changes in diferent parts of well trajectory. The number of build and drop sections signifcantly afect the amount of torque loss, while up to 50% to 70% of torque loss was observed in the drop or build section.

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Publication Date

31-12-2020

First Page

10

Last Page

17

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