Research on the mechanism and diagnosis for screw drilling tool misalignment

doi:10.12143/j.ztgc.2021.03.012

Home > Archive>Volume 48, Issue 3, 2021 >86-93. DOI:10.12143/j.ztgc.2021.03.012

Research on the mechanism and diagnosis for screw drilling tool misalignment
DOI:
                        10.12143/j.ztgc.2021.03.012
                    
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Author:
                        MA Zhonghai1,2MA Zhonghai
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;Key Laboratory of Deep Geodrilling Technology, Ministry of Natural Resources, Beijing 100083, China
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LIU Jiachen1,2LIU Jiachen
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;Key Laboratory of Deep Geodrilling Technology, Ministry of Natural Resources, Beijing 100083, China
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OUYANG Jingrong1,2OUYANG Jingrong
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;Key Laboratory of Deep Geodrilling Technology, Ministry of Natural Resources, Beijing 100083, China
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MU Xinggang1,2MU Xinggang
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;Key Laboratory of Deep Geodrilling Technology, Ministry of Natural Resources, Beijing 100083, China
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MA Shoufa1,2MA Shoufa
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;Key Laboratory of Deep Geodrilling Technology, Ministry of Natural Resources, Beijing 100083, China
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WANG?Lu1,2WANG?Lu
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;Key Laboratory of Deep Geodrilling Technology, Ministry of Natural Resources, Beijing 100083, China
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Affiliation:1.School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;2.Key Laboratory of Deep Geodrilling Technology, Ministry of Natural Resources, Beijing 100083, China
Clc Number:P634
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Abstract:

The screw drill tool is a shaft system consisting of a number of rotating shafts connected by a universal coupling， which is used to transfer torque to drive the bit motion. However， owing to the installation or wear and tear of the universal coupling itself， the axial misalignment of the drilling tool will appear， leading to a series of failures， such as offset of the screw motor rotor coupling， bearing movement， shaft deformation， oil film instability， etc.， leading to vibration of the tool and a series of hazards. Therefore， it is of great significance to study the failure mechanism of downhole power drilling tool misalignment， grasp the characteristics of different failures， and timely diagnose the failures under laboratory conditions， so as to reduce or avoid the failures caused by misalignment of the rotor coupling. In this paper， the DHRMT double-span rotor bench is used to simulate various downhole drilling tool failures through setting of rotor misalignment， and the vibration characteristics caused by rotor misalignment is obtained through experiments so as to provide a reference for downhole power drilling tool design and improvement.

Key words:screw drill tools;rotor misalignment;vibration characteristics;failure diagnosis;downhole drilling tools

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History

Received:October 28,2020
Revised:January 31,2021
Adopted:February 01,2021
Online: March 22,2021
Published: March 10,2021

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