These types of completions are commonly used in applications where zonal crossflow is undesirable, or regulations prohibit commingling. The lower zone is segregated by a packer and is flowed up the primary tubing string. The upper zone flows up the casing annulus or a secondary tubing string. Blast joint(s) may be run adjacent to the upper zone on the primary tubing string to prevent tubing erosion. Dual completions can be configured to meet a variety of customer well requirements.