Abstract
During oil and gas drilling, the harmful vibration of the drill string greatly reduces drilling efficiency. The interaction between the drill bit and the formation is one of the main sources of drill string vibration. Studying the vibration characteristics of the drill bit during rock breaking is the basis for controlling the vibration of the drill string and improving drilling efficiency. This article uses a self-designed three-dimensional rock breaking test system to conduct rock breaking tests under different drilling parameters, and combines the discrete element method to study the vibration characteristics of the drill bit. Research has shown that the values and vibration amplitude of weight on bit(WOB), and fluctuation amplitude of rotational speed all increase with the increase of the rate of penetration(ROP); At the same ROP, the higher the rock strength, the greater the WOB; The vibration frequency of WOB is more complex than the vibration frequency of rotational speed. The vibration frequency of WOB changes with the increase of drilling pressure, and the vibration frequency of rotational speed is independent of the magnitude of WOB, basically equal to the first-order torsional natural frequency of the system; As the drilling pressure increases, the vibration frequency of the WOB gradually approaches the vibration frequency of the rotational speed. The research results deepen the understanding of the vibration characteristics of drill bits and have practical guiding significance for studying the movement of drill strings.
Copyrights 2023, IFEDC Organizing Committee.
This paper was prepared for presentation at the 2023 International Field Exploration and Development Conference in Wuhan, China, 20–22 September 2023.
This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Technical Team and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Technical Committee its members. Papers presented at the Conference are subject to publication review by Professional Team of IFEDC Technical Committee. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of IFEDC Organizing Committee is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.
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Huang, B., Ni, Hj., Zhang, H., Liu, Sb., Yu, F. (2024). Experiments and 3D Numerical Simulation Study on the Vibration Characteristics of PDC Bits During Rock Breaking. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2023. IFEDC 2023. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-97-0256-5_10
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