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Anti-torque systems of electromechanical cable-suspended drills and test results

  • Pavel Talalay (a1), Xiaopeng Fan (a1), Zhichuan Zheng (a1), Jun Xue (a1), Pinlu Cao (a1), Nan Zhang (a1), Rusheng Wang (a1), Dahui Yu (a1), Chengfeng Yu (a1), Yunlong Zhang (a1), Qi Zhang (a1), Kai Su (a1), Dongdong Yang (a1) and Jiewei Zhan (a1)...
Abstract
Abstract

To prevent spinning of the upper non-rotated part of the electromechanical drill, an ‘anti-torque system’ has to be included in the downhole unit. At the same time, the anti-torque must allow the drill to move up and down the borehole during drilling and tripping operations. Usually the anti-torque system has a blade form of various designs that engages with the borehole wall and counteracts the torque from the stator of the driving motor. This paper presents a review of the different anti-torque systems and test results with selected designs (leaf spring, skate and U-shaped anti-torque systems). Experiments showed that the skate anti-torque system can provide the maximal holding torque between 67 and 267 Nm−1 depending on the skates’ outer diameter and ice temperature, while the leaf spring anti-torque system can provide only 2.5–40 N m−1 (in case of straight contact between the ice and the leaf springs). The total resistance force to axial movement of the skate anti-torque system lies in the range 209–454N if the system is vibrating. For the leaf spring anti-torque system, the total axial resistance force is far less (19–243 N).

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References
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Annals of Glaciology
  • ISSN: 0260-3055
  • EISSN: 1727-5644
  • URL: /core/journals/annals-of-glaciology
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