This paper will address some important factors that should bernconsidered when designing drill-strings for horizontal andrnextended reach wells (ERW). A second paper will look intornthe issues of casing design for the same type of wells andrnpresent some practical field cases and examples of drill-stringrnand casing design for ERW.rnBuckling of the string and its influence on reach capability,rnfatigue and directional control will be emphasized.
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