Abstract
Abstract Maintaining full gage hole while drilling the chert laden Monterey formation offshore California is a constant problem due to the highly abrasive nature of the rock. Three cone rock bits having conventional tungsten carbide gage inserts wear severely necessitating reaming as well as frequent replacement of downhole tools. Offshore bit tests have been performed on three cone bits with highly wear resistant diamond enhanced gage inserts. These test results have shown these new bits to be capable of drilling in-gage holes through the Monterey formation, and as a consequence, reaming has been significantly reduced. This paper will give an overview of the drilling problems encountered offshore California. A discussion will be provided on the diamond enhanced insert technology and its impact on drilling performance, downhole tool replacement and reaming time in the Monterey formation offshore California.
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