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A ''barge rig'' is designed to work in shallow water (less than [[length::20 ft]] dee A ''submersible rig'' is a barge that is designed to work in deeper water (to [[length::50 ft]] deep). It ha

...perform. For example, wells drilled in fault-damaged zones in the North La Barge Shallow Unit of Wyoming are the poorest producers in the field.<ref name=Mi