Determining the integrity of an isolated zone in a wellbore

A zonal isolation assessment system comprising:

• a receiver residing at or near a surface of a wellbore;
• production tubing configured to be disposed in the wellbore;
• a zonal isolation assembly configured to reside downhole of and fluidically coupled to the production tubing, the zonal isolation assembly configured to isolate a zone of the wellbore and comprising:
• isolation tubing configured to flow production fluid from the wellbore to the production tubing,
• a first sealing element coupled to the isolation tubing, and
• a second sealing element coupled to the isolation tubing and disposed downhole of the first sealing element, the first sealing element and the second sealing element configured to be set on a wall of the wellbore to fluidically isolate an internal volume of the isolation tubing from an isolated annulus defined between the isolation tubing and the wall of the wellbore, the annulus extending from the first sealing element to the second sealing element;
• and
• an assessment assembly disposed at least partially inside the isolation tubing and communicatively coupled to the receiver, the assessment assembly comprising,
• a first pressure sensor residing at the internal volume of the isolation tubing and configured to sense a first pressure value representing a fluidic pressure of the internal volume, and
• a second pressure sensor residing at the annulus and configured to sense a second pressure value representing a fluidic pressure of the annulus, the assessment assembly configured to transmit, to the receiver, the first pressure value and the second pressure value such that the first and second pressure values are usable to determine, based comparing the first pressure value with the second pressure value, a zonal isolation integrity of the zonal isolation assembly.