Zonal isolation is necessary for efficient production and stimulation operations of a well. It plays a crucial role in prevention of fluid and gas migration that may increase risk of leakage, drilling time, and cost of construction. In addition, it protects the casing from corrosion, prevents blowouts by rapidly forming a seal, protects the casing from shock loads, and seals off zones of lost circulation. Annular barrier is provided in zonal isolation to isolate the well annulus from reservoir. It can be used for applications such as open-hole fracturing, cement replacement & protection, unconventional fracturing, and side track window sealing.