E. P. Deliac, J. P. Messines Elf Aquitaine Paris B. A. Thierree Exploservices Paris Oil exploration companies have taken increased interest in slim hole drilling as practiced by the mining drilling industry in small diameter coring. In addition to providing cores for the entire well, the core hole drilling technique is an attractive exploration method because a well can typically be drilled for approximately 30% less than the cost of a conventionally drilled well. These savings increase even further for remote locations because the smaller core hole rig package reduces logistics and transportation expenses. The world...

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