Abstract
ABSTRACT An analysis of three-cone rock bit runs using extended jet nozzles (EN) in the Middle East Region is presented. These runs were made from 1982 to 1984 in several Middle East countries. They represent wells drilled onshore and offshore, vertical and deviated, using oil and water based mud systems. The improvements in performance gained by enhanced hole cleaning with extended nozzles are well documented. This feature has been widely used in the South East Asia – Far East region and in certain areas of the continental U.S.A. and Alaska since the mid – 1970's. The result of the EN runs in the Middle East correlate well with results in the proven areas elsewhere in the world. Penetration rate increases over regular jet bits of 7-80% have been recorded. The high daily rig costs characteristic of Mideast drilling operations make it fairly easy to show a cost per foot decrease with only slight increases in performance. The increased bit cost due to the EN feature is found to be virtually negligible.
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