Patent ID: 8127856

Claim:
A downhole tool system for completing a well, comprising: a) a plug body selectively securable to a wellbore at a desired depth and having a flowbore formed therein with an upper cavity; b) a flow valve assembled from a plurality of interchangeable components selectively disposable in the upper cavity of the flowbore to control fluid flow therethrough, the plurality of interchangeable components including: i) a permanent bridge plug securable in the upper cavity of the flowbore of the plug body by a permanent retainer to permanently restrict fluid flow through the flowbore; ii) a permanent frac ball movable in the upper cavity of the flowbore of the plug body between an open position that allows one-directional fluid flow through the flowbore and a closed position that restricts fluid flow through the flowbore; and iii) a degradable retainer including at least one biodegradable ball disposable in the upper cavity of the flowbore with the permanent frac ball or a movable flow restrictor to temporarily retain the permanent frac ball or the movable flow restrictor in a closed position or an open position, the degradable retainer being degradable or dissolvable within a predetermined passage of time inside a natural wellbore environment to release the permanent frac ball or the flow restrictor to move.