Multiple zone completion is one type of completion which allows operators to selectively produce or comingle reservoir fluid from different zones into one well. It is also possible to workover the upper part of completion string without removing the next interval completion. Additionally, through tubing perforation is can performed at the bottom zone. A multiple zone completion can be divided into two parts, which are single string completion and multiple string completion.
Single zone completion is one of the types of upper completion which allows producing only one zone. Production tubing is a flow path for fluid from a reservoir to flow to the surface so it protects the casing from corrosion and maximizes the efficiency of the flow.
In a single tubing string completion, typically a packer is set on top of a reservoir so the reservoir fluid can flow up into the production tubing. Types of packers are based on several factors as temperature, pressure, reservoir fluid, etc. Additionally, complexity of tubing and packer installation is driven by objectives.
