Very often, a wellbore penetrates numerous geologic zones of interest. An optimum completion design addresses a method of isolating these zones while protecting the reservoir for future exploitation. A common practice is to utilize two or more packers for efficient zonal isolation. When designing such a completion, a number of conditions and phenomena must be considered. These include, among others: thermal expansion; pressure changes; piston effects, and their resultant force and/or length changes. This paper outlines some of the factors that must be taken into consideration, then presents specific challenges and viable solutions for typical multitandem completion designs.

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