Abstract
This paper describes how design innovations of underreamers are helping to save drilling costs by allowing simultaneous drilling and underreaming. In a February 1989 deepwater exploration test in the Green Canyon area of the Gulf of Mexico, simultaneous drilling and underreaming was successful in three consecutive intervals totaling 3,930 ft. Average penetration rate was 27.4 ft/hr. The simultaneous drilling and underreaming operation produced a potential savings of a cumulative 73 hr when compared with separate drilling and underreaming. The simultaneous operation represented a substantial savings in rig costs, relative to drilling and underreaming in separate operations. This was particularly significant because the well was drilled in more than 3,700 ft of water. The operation was made possible by developments in underreaming tools and in their application technology.
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