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Arabian Journal for Science and Engineering

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07-03-2023 | Research Article-Petroleum Engineering

Simulation and Experimental Study on Rock-Breaking Mechanism of the Reverse Rotary Torque Self-balancing Dual Drill Bit

Authors: Cong Zhang, Ke Gao, Yan Zhao, Xiaobo Xie, Congshan Zhang, Xiaoshu Lv

Published in: Arabian Journal for Science and Engineering | Issue 12/2023

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Abstract

The stick–slip vibration of a drill bit in oil and gas drilling causes significant disturbances to the formation, severely impacting the drilling quality. The dual drill bit (DB) torque self-balancing drilling technology has superior drill bit stability, obtained by balancing the torques of the inner and outer bits (IB and OB). However, research on the DB working process is still in the initial stages. To analyze the vibration reduction in the DB from the perspective of the rock-breaking mechanism, this study established a dynamic rock-breaking finite element model of the DB through theoretical calculations and conducted a numerical simulation comparison and drilling experiment comparison of the rock-breaking process between the DB and conventional drill bit (CB). The differences in the reactive torque between the DB and CB were compared. Subsequently, the drilling process was simulated using the two drilling methods, including the rock-breaking process, core and wellbore disturbance, and bit motion. The results indicate that DB drilling can reduce the torque vibration of the rock on the drill bit by 69.7%, thus decreasing the damage to the formation. In addition, DB can form a shear-breaking effect on the rock at the junction of IB and OB, which improves the rock-breaking efficiency by 13.8%. The results of this work will help reveal the low stick–slip vibration mechanism of the DB self-balancing drilling technique, which can provide new ideas for the study of drilling stability.

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Title: Simulation and Experimental Study on Rock-Breaking Mechanism of the Reverse Rotary Torque Self-balancing Dual Drill Bit
Authors: Cong Zhang
Ke Gao
Yan Zhao
Xiaobo Xie
Congshan Zhang
Xiaoshu Lv
Publication date: 07-03-2023
Publisher: Springer Berlin Heidelberg
Published in: Arabian Journal for Science and Engineering / Issue 12/2023
Print ISSN: 2193-567X
Electronic ISSN: 2191-4281
DOI: https://doi.org/10.1007/s13369-023-07699-8

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