Abstract
ABSTRACT Increased penetration rate accompanied with longer life have always been primary objectives of both rock bit manufacturers and drilling contractors. Tungsten carbide inserts have been used in rock bits for over 30 years and are a mature technology. Synthetic diamond insert technology may prove to be the next step in three-cone rock bit performance. For the past 24 months a development program has been conducted focusing on the application of high pressure diamond technology to three-cone rotary rock bit drilling. A diamond coated insert has been developed that shows little wear even when run in the gage row, after drilling over 200 hours and 6000 feet of formation. This paper reviews the design and laboratory testing of diamond enhanced gage Inserts with an emphasis on field performance. The impact of this technology on bit life, penetration rate, and drilling costs will also be discussed.
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