About Rock drill rig performance test
Roller cone insert Volume Indentation depth (WOB) Sliding distance per minute (RPM) .
Figure DP-7: Founder, or rock-cutting dysfunction, causes the depth of cut and ROP to be less than it should be for a given WOB, causing.
Each of the categories of bit dysfunction will be discussed, as well as the observations that can be made to diagnose .
Bit balling occurs when drilled material accumulates on the cutting structure that begins to carry some of the applied WOB, so that the weight on the cutter tips is reduced. Con-
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About Rock drill rig performance test video introduction
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6 FAQs about [Rock drill rig performance test]
How to evaluate the drilling efficiency of a percussive drill rig?
Evaluation of drilling efficiency by coupling v and e The drilling rate and the specific energy are two indexes to evaluate the drilling efficiency. The optimal drilling efficiency of the percussive drill rig corresponds to the maximum drilling rate and the minimum specific energy.
How does a rock drilling jumbo record the drilling parameters?
During the drilling process, the rock drilling jumbo real-timely records the drilling parameters by using distance-sampling method, such as the drilling distance ( s, mm), the drilling time ( t, s), the propelling pressure ( pt, MPa), the percussive pressure ( pi, MPa), the rotary speed ( n, rev/min), and the torque ( T, N·m).
What are the input parameters of a percussive drill rig?
The input parameters consist of the weight on bit (WOB), the rotary speed (RPM), the flow rate (Q), and so on. Some of these parameters are similar to those of the rock drilling jumbo, whereas some are different. Therefore, a prediction model of the drilling rate is required for the percussive drill rig.
Does rock properties affect drilling performance?
Therefore, not only rock properties, but also different sets of drilling forces acting on rock as well as drilling method all have impacts on the drilling performance (Detournay and Defourny 1992; Detournay et al. 2008; Franca 2010, 2011; Franca et al. 2015; Hustrulid and Fairhurst 1971b; Teale 1965).
Why do drilling operators need a new index based on rock properties?
However, drilling operators always change drilling parameters to achieve higher drilling efficiency. Hence, a new index that is only related to rock properties and can be successfully applied under different drilling conditions should be developed to define rock properties.
How does a percussive drill rig work?
Rotation is the application of imposing hoop rotary speed. The purpose of the rotation is to move the position of the bit teeth to help cut the rock ridges around the impact pit. The percussive drill rig consumes energy to motivate the three actions. Under the combination of the three actions, the drilling bit and the rock interact with each other.