In this study four sandstone rocks were drilled by diamond core bit using a fixed laboratory-drilling machine at 400 and 1200 rpm, rotary speed, over a range of weights on bit (WOB) 12,18,24,30,…….,150 kg. Operating parameters of the drill bit such as WOB, penetration rates (PR), torque (T) and specific energy (SE) were continuously monitored during the drilling trials. Besides the effects of formation properties on the penetration rate were monitored. Relationships between WOB and both PR, torque T and SE were determined and the relationship between PR and SE was given. Graphs are presented and can be used to predict diamond-drilling performance easy and fast.

In this study four marble rocks were drilled by diamond core bit using a fixed laboratory-drilling machine at 400 and 1200 rpm, rotational speed, and over a range of weights on bit (WOB) 45, 60, 75, 90, … 225 Kg. Operating parameters of the drill bit such as WOB, penetration rate (PR), torque (T) and drilling specific energy (SE) were continuously monitored during the drilling trials. The effects of these parameters on the penetration rate were examined, and the effects of formation properties on the drilling rate were examined. Relationships between WOB and both PR, torque T and SE were described and the relationship between PR and SE was determined. Graphs are presented which can be used to predict diamond-drilling performance easy and fast.

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Topics in Mining, Metallurgy and Materials Engineering" welcomes manuscripts in these three main focus areas: Extractive Metallurgy/Mineral Technology; Manufacturing Processes, and Materials Science and Technology. Manuscripts should present scientific solutions for technological problems. The three focus areas have a vertically lined multidisciplinarity, starting from mineral assets, their extraction and processing, their transformation into materials useful for the society, and their interaction with the environment.

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