The effects of varying vibration frequency and power on eficiency in vibration assisted rotary drilling

Yusuf, Babatunde Olaiya (2011) The effects of varying vibration frequency and power on eficiency in vibration assisted rotary drilling. Masters thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (28MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

Improving drilling efficiency and mitigating risk are major objectives of Vibration Assisted Rotary Drilling (VARD). Understanding the behavior of vibration energy applied to enhance drilling Rate of Penetration (ROP) and reducing bit wear is extensively looked at in this research. -- A series of tests and analysis was carried out to provide data for the evaluation of the effects of varying vibration frequency and amplitude in rotary drilling. Two separate drill bits: impregnated diamond drag bit and the polycrystalline diamond compact (PDC) were used. Vibration frequencies were varied at different levels of amplitudes. With water used as the drilling fluid and drilling at atmospheric condition, rock samples with known Unconfined Compressive Strength (UCS) were drilled with a fully instrumented laboratory drill rig, and all operating parameters were closely monitored. The interpretation of results shows that vibration rotary drilling using impregnated diamond drag bit and PDC bit at controlled vibration frequencies has significant performance increase in ROP compared with conventional rotary drilling. The contribution of vibration to this performance increase was found to be very significant. Drilling runs were short, of necessity, in this study and bit wear was not significant.

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