Three-dimensional simulation of rock breaking efficiency under various impact drilling loads
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ORIGINAL PAPER
Three-dimensional simulation of rock breaking efficiency under various impact drilling loads Yandong Yang 2,3 & Hualin Liao 1,2 & Jilei Niu 2 & Zhen Wang 2 & Junhai Chen 1 Received: 4 June 2019 / Accepted: 20 May 2020 # Saudi Society for Geosciences 2020
Abstract Percussion drilling is believed to be an efficient way to enhance the drilling performance, compared with the conventional drilling in deep wells, which could be achieved by applying impact loads above the drill bit. The finite simulation is an efficient method to predict the drilling performance when the drill bit interacts with rocks. In contrast, as results of finite element technology limitation, the conventional way is to apply the displacement or velocity boundary conditions on the bit; however, this is completely different from the real field drilling process. Therefore, in this paper, a 3-D rock-bit physical model is presented to simulate the practical percussion drilling under various types of loads; at the same time, experiment was conducted to validate the effectiveness of the rock-bit model. The results demonstrated that the drilling performance with the rectangular and sinusoidal loads was promoted than the other types of load, and rate of penetration (ROP) increases with increasing of the amplitude of dynamic load, which could provide the theoretical guidance to the down-the-hole drilling tool design, thereby proving a quite efficient and lower cost drilling in the exploration of hard formations. Keywords Percussion drilling . Rock breakage . Energy transfer efficiency . Impact load shapes
Introduction The essence of drilling is to solve the interaction between the drill bit and rock, as well as to promote penetration rate through the efficiency increase of rock breaking (Ma et al. 1995; Wu et al. 2014). In deep wells (Guarin et al. 1949; Whiteley and England 1985; Wanamaker 1951; Melamed et al. 2000), the difficulty of drilling speed improvement increases due to the complicated geological conditions, the geological uncertainty, and the poor drilling ability (An et al. 2012). Rock breaking corresponds to different evaluation criteria for different sizes; for the larger particles of rock, the Responsible Editor: Santanu Banerjee * Hualin Liao [email protected] 1
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101, China
2
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
3
School of Mining and Petroleum Engineering, University of Alberta, Edmonton, AB T6G 2R3, Canada
amount of energy consumed is defined by the unit volume of rock fractures; for the smaller particles, the amount of energy consumed is defined by rock broking power; that is, the energy generated by the unit’s new surface to measure the crushing effect on these smaller particles. Through the determination of crushing strength and crushing ratio of dynamic and static load, it was demonstrated that if a dynamic load was applied above the drill bit, the pen
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