Pros and Cons of Cased Hole Completion

Advantages:

• It allows the better control of production from multiple zones within a single well.

• Casing across the production zone provides better integrity and support. It reduces the risk of collapse of any unconsolidated formations in the production hole while producing the well.

• In multiple-layer reservoirs, a cased and perforated completion allows for zonal isolation for different zones.

• It also allows selective stimulation treatment for different zones in multiple-layer reservoirs to achieve optimized production from each zone.

• In case of water encroachment, different zones can be selectively plugged and continue production from other zones. 

Disadvantages:

• It has a higher initial cost for the casing, cementing, perforation, stimulation, and completion equipment.

• Cementation of the casing causes more formation damage which could reduce production if not stimulated well.

• It provides less reservoir exposure than the open hole completion

• The fluid flow area is smaller than in open hole completion causing more restrictions