Leigh Foster ARCO British Ltd. Guildford, England A type of slim-hole well design reduced the cost of drilling a horizontal well in the southern North Sea. The basic slim-hole drilling and casing program was similar to that used in conventional directional wells in the field, but with slight modifications for drilling with logging-while-drilling (LWD) tools and running production liners. The oriainal field slimhole casing design incorporated only the minimum number of casing strings required to drill conventional slant wells. The design is referred to as slim-hole because there is no 26-in. surface hole or 20-in. casing. This design saves...

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