MECHANICAL AND GEOLOGICAL INFLUENCES ON DRILLING LIMESTONE ROCK AT LOW ROTARY SPEED | ||
| JES. Journal of Engineering Sciences | ||
| Article 16, Volume 38, No 1, January and February 2010, Pages 259-270 PDF (307.22 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.21608/jesaun.2010.123818 | ||
| Author | ||
| Gamal Y. Boghdady | ||
| Mining and Metallurgical Engineering Department, Faculty of Engineering, Assiut university, Assiut, Egypt | ||
| Abstract | ||
| The drillability of a rock mass is determined by various geological and mechanical parameters. In this study some major correlations between specific geological factors and drilling rate are shown. Drilling rate is dependent on a lot of geological parameters which include jointing of rock mass, orientation of schistosity (rock anisotropy), degree of interlocking of microstructures, porosity and quality cementation in clastic rock, degree of hydrothermal decomposition and weathering of a rock mass. Three types of limestone rocks were drilled by diamond core bit using a fixed laboratory-diamond drilling machine at 400 rotational speed, and over a range of weights on bit (WOB) 15,30,45,…….,150 kg. Operating parameters of the drill bit such as WOB, rate of penetration (ROP), torque and drilling specific energy (SE) were continuously monitored during the drilling trials. The effects of these parameters on the performance of the bit were examined. Relationships between WOB and both ROP, torque and SE were also described and the relationship between ROP and SE, was also given. Simple graphs are presented which can be used to predict diamond-drilling performance easy and fast. | ||
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