Working mechanism and experimental study of dual-diameter and bi-speed composite drilling tool |
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Authors: | Jialin Tian Xuehua Hu Liming Dai Liang Zhang Heng Li Xiaoyue Lin |
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Institution: | 1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Chinatianjialin001@gmail.com https://orcid.org/0000-0002-9991-9839;3. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, China;4. Industrial Systems Engineering, University of Regina, Regina, SK, Canada;5. Sichuan DeepFast Oil Drilling Tools Co., Ltd., Chengdu, China |
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Abstract: | ABSTRACTAs oil and gas production gradually shifts to deep and ultra-deep formations, the pressure and complexity of stratum is increased and drilling efficiency is decreased. Based on this, a Dual-diameter and bi-speed composite drilling method that can realize the different depth, diameter, and rotate speed coupling using only hole-bottom power is proposed in this paper. And a Dual-diameter and bi-speed composite drilling tool is designed, processed, and carried out to complete the field experiment. The tool is connected by a two-stage screw to make the rotate speed of a pilot bit higher than that of the reaming bit to increase the rate of penetration. And a concave bottom hole is formed so that the ground stress is released and the drillability of rock is lifted. Based on the introduction of the speed-up mechanism of the tool, the numerical analysis of the drilling performance of the tool with different diameter ratios and rotate-velocity combinations is completed. The experimental data showed that the Dual-diameter and bi-speed composite drilling method can obviously increase the rate of penetration and drilling efficiency, and also help to reduce the risk of stick-slip and prolong the service life of the drill bit. |
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Keywords: | Dual-diameter and bi-speed hole-bottom power drillability speed-up rate of penetration |
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