Patent ID: 8567494

Claim:
A wellbore system comprising: a tubular member for being located in a wellbore; an inner surface of the tubular member; a seat extending from an inner surface of the tubular member at a first location within the tubular member; a wellbore element configured to be dropped into a wellbore and engage the seat to provided a fluid barrier to prevent fluid flow therepast; process fluids pumpable into the tubular member having a temperature less than a wellbore temperature; a first component of the wellbore element that is non-dissolvable when exposed to a selected wellbore environment; and a second component of the wellbore element that is soluble in the selected wellbore environment and has location of dissolution at least partially controlled by the first component, the second component selected to dissolve at a first rate when exposed to the temperature of the process fluids and dissolve at a second rate faster than the first rate when exposed to the wellbore temperature.