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6 FAQs about [Rock drill driver test paper]
What information pertaining to drilling characteristics should be recorded?
The following information pertaining to drilling characteristics should be recorded in the remarks section of the boring log: A detailed discussion of diamond core drilling is presented in AASHTO T 225 and ASTM D 2113.
What is drilling fluid?
Drilling fluid may be water, mud, foam, or compressed air. Caution should be exercised when using these methods to define the top of soft rock since drilling proceeds rapidly, and cuts weathered and soft rock easily, frequently misrepresenting the top of rock for elevation or pile driving applications.
How do you know if a drill is a good drill?
Mechanical Specific Energy (MSE) surveillance is another method for determining drilling performance. Drill-of tests are well suited to roller-cone bits, intermediate drill string lengths with significant stored stretch, and bit balling.
What should a driller know about sample recovery?
The driller should be clearly instructed not to force recovery by overdriving the sampling barrel to grab a sample. Improper sample types or insufficient quantity of samples. The driller should be given clear instructions regarding the sample frequency and types of samples required.
What is drill-of testing?
Drill-of testing is a method developed in the 1950s to min-imize the time to determine performance at various WOBs (Figure DP-5). The process works well with roller cone bits at moderate to low drill rates, but it tends to be less efec-tive with PDC bits. The driller applies a high WOB, locks the top-drive position, and continues rotation.
Does rock strength affect drill rate?
When operating eficiently, rock strength and bit aggressive-ness efect the drill rate, but large changes in drill rate are usually due to ineficiency or dysfunction in the rock cutting process. If the bit is eficient, it is only necessary to raise the WOB or RPM in order to drill faster.