This test was first proposed by Lubinski in 1958 and is the quickest method of finding the WOB and RPM combination for maximizing ROP. To get the best combination,it is desired that the test be carried out.
2. When to carry out Drill- Bit Test:
• Drill-bit test needs to be done at the start of
bit run
• On encountering a new formation
• If there is a reduction in ROP