Drilling efficiency and stability comparison between Tricone, PDC and Kymera drill bits

Abstract

The primary object of this thesis is to analyse and optimise the drill bits performance that used to drill on the Norwegian Continental Shelf. The three different types of bits that were utilized under drilling are described in the first part of the thesis. The different aspects of designs and features are discussed and their technological advantages are highlighted.

In the second part of the thesis an experimental tests are conducted. The main purpose of this test is to evaluate the performance, efficiency and stability of 9 ½ inch Kymera (KM623), against 9 ½ inch PDC (6 bladed), and 9 ½ inch (TCI) VMD - 20. The test will compare the drillability (ROP), durability (dullgrade, wear etc) and stability of Kymera vs PDC and TCI. All the bits will be tested in the same formation types and strenghts at the same range of RPM and ROP parameters. Bit response, stability and MSE will be evaluated in order to better understand bit behavior in the subject formation. The analyses and conclusions will be used for future field drilling optimization and advice in offshore operations.