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A downhole tool for use in completing a well includes a plug body selectively securable to a wellbore at a desired elevation and having a flowbore. A non-dissolvable flow restrictor is operably disposed in the flowbore and operates to restrict fluid flow through the flowbore, and a time-dissolvable

A downhole tool for use in completing a well includes a plug body selectively securable to a wellbore at a desired elevation and having a flowbore. A non-dissolvable flow restrictor is operably disposed in the flowbore and operates to restrict fluid flow through the flowbore, and a time-dissolvable retainer or spacer is operably coupled to the flow restrictor to retain the flow restrictor in a first position within the flowbore. The retainer is dissolvable within a predetermined passage of time to release the flow restrictor to move between the first position and a second position within the flowbore to control the flow of fluid through the downhole tool.

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1. A downhole tool for use in completing a well, comprising: a) a plug body selectively securable to a wellbore at a desired depth and having a flowbore formed therein;b) a non-dissolvable flow restrictor disposed in the flowbore and operable to restrict a flow of fluids through the flowbore;c) a ti

1. A downhole tool for use in completing a well, comprising: a) a plug body selectively securable to a wellbore at a desired depth and having a flowbore formed therein;b) a non-dissolvable flow restrictor disposed in the flowbore and operable to restrict a flow of fluids through the flowbore;c) a time-dissolvable retainer pressed against the flow restrictor to retain the flow restrictor in a first position within the plug body, the retainer being dissolvable within a predetermined passage of time inside a natural wellbore environment to release the flow restrictor to move between the first position and a second position within the plug body; andd) the time-dissolvable retainer comprising at least one biodegradable ball. 2. The downhole tool of claim 1, wherein the at least one biodegradable ball is selected from a set of different biodegradable balls, each biodegradable ball being configured to dissolve within a different predetermined passage of time. 3. The downhole tool of claim 1, wherein the non-dissolvable flow restrictor further comprises a frac ball configured to seat against a sealing surface in the upper end of the flowbore in a closed position to seal the flowbore against the flow of fluids. 4. The downhole tool of claim 1, wherein the non-dissolvable flow restrictor further comprises a bridge plug movably disposed within the upper end of the flowbore and positionable in a closed position to seal the flowbore against the flow of fluids. 5. The downhole tool of claim 1, wherein the flow restrictor closes the flowbore in the first position to prevent the flow of fluid in either direction, and movement of the flow restrictor between the first position and the second position after the time-dissolvable retainer dissolves allows for a one-directional upward flow of fluid through the flowbore. 6. The downhole tool of claim 1, wherein the flow restrictor in the first position allows a bi-directional flow of fluids through the flowbore, and movement of the flow restrictor between the first position and the second position after the time-dissolvable retainer dissolves allows for a one-directional upward flow of fluid through the flowbore. 7. The downhole tool of claim 1, wherein the time-dissolvable retainer is removable and replaceable with a permanent retainer to permanently close the valve and form a bridge plug. 8. The downhole tool of claim 7, wherein the permanent retainer further comprises at least one metal ball. 9. A downhole tool for use in completing a well, comprising: a) a plug body selectively securable to a wellbore at a desired depth and having a flowbore formed therein;b) a non-dissolvable flow restrictor disposed in the flowbore and operable to restrict a flow of fluids through the flowbore;c) a time-dissolvable retainer operably coupled to the flow restrictor to retain the flow restrictor in a first position within the plug body, the retainer being dissolvable within a predetermined passage of time inside a natural wellbore environment to release the flow restrictor to move between the first position and a second position within the plug body;d) the flow restrictor closing the flowbore in the first position to prevent the flow of fluid in either direction, and movement of the flow restrictor between the first position and the second position after the time-dissolvable retainer dissolves allows for a one-directional upward flow of fluid through the flowbore;e) an annulus positioned in the flowbore such that the time-dissolvable retainer is disposed between the annulus and the flow restrictor; andf) the annulus is positionable in the flowbore to press against the time-dissolvable retainer to cause the time-dissolvable retainer to press against the flow restrictor, so as to retain the flow restrictor in the closed position until the time-dissolvable retainer dissolves. 10. The downhole tool of claim 9, wherein the annulus has a through aperture to allow visibility of the time-dissolvable retainer, and wherein the time-dissolvable retainer is color coded according to the predetermined passage of time so as to allow a user to identify the predetermined passage of time by visually observing the color of the time-dissolvable retainer through the aperture. 11. A downhole tool for use in completing a well, comprising: a) a plug body selectively securable to a wellbore at a desired depth and having a flowbore formed therein;b) a non-dissolvable flow restrictor disposed in the flowbore and operable to restrict a flow of fluids through the flowbore;c) a time-dissolvable retainer operably coupled to the flow restrictor to retain the flow restrictor in a first position within the plug body, the retainer being dissolvable within a predetermined passage of time inside a natural wellbore environment to release the flow restrictor to move between the first position and a second position within the plug body;d) the flow restrictor in the first position allows a bi-directional flow of fluids through the flowbore, and movement of the flow restrictor between the first position and the second position after the time-dissolvable retainer dissolves allows for a one-directional upward flow of fluid through the flowbore;e) a retaining pin in the flowbore such that the flow restrictor is disposed between the retaining pin and the time-dissolvable retainer; andf) the retaining pin positionable in the flowbore to press against the flow restrictor to cause the flow restrictor to press against the time-dissolvable retainer so as to retain the flow restrictor in an open position until the time-dissolvable retainer dissolves. 12. The downhole tool of claim 11, wherein the retaining pin allows visibility of the time-dissolvable retainer, and wherein the time-dissolvable retainer is color coded according to the predetermined passage of time so as to allow a user to identify the predetermined passage of time by visually observing the color of the time-dissolvable retainer through the aperture. 13. 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;b) a flow valve comprising a plurality of interchangeable components selectively disposable in the flowbore to control fluid flow therethrough, the plurality of interchangeable components comprising: i) a non-dissolvable flow restrictor disposed in the flowbore and operable to restrict a flow of fluids through the flowbore; andii) a time-dissolvable retainer pressed against the flow restrictor to retain the flow restrictor in a first position within the plug body, the retainer being dissolvable within a predetermined passage of time inside a natural wellbore environment to release the flow restrictor to move between the first position and a second position within the plug body;c) the interchangeable components being selectively configurable to retain the flow valve in an open position allowing a bi-directional flow of fluids through the flowbore, or in a closed position preventing the flow of fluids in either direction through the flowbore, until after the time-dissolvable retainer dissolves; andd) the time-dissolvable retainer comprising at least biodegradable ball. 14. The downhole tool system of claim 13, wherein the at least one biodegradable ball is selected from a set of different biodegradable balls, each biodegradable ball being configured to dissolve within a different predetermined passage of time. 15. The downhole tool system of claim 13, wherein the non-dissolvable flow restrictor further comprises a frac ball configured to seat against a sealing surface in the upper end of the flowbore in a closed position to seal the flowbore against the flow of fluids. 16. The downhole tool system of claim 13, wherein the interchangeable components are secured within the flowbore with a non-dissolvable retainer allowing visibility of the time-dissolvable retainer, and wherein the time-dissolvable retainer is color coded according to the predetermined passage of time so as to allow a user to identify the predetermined passage of time by visually observing the color of the time-dissolvable retainer. 17. 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;b) a flow valve assembled from a plurality of interchangeable components selectively disposable in the flowbore to control fluid flow therethrough, the plurality of interchangeable components including: i) a permanent bridge plug securable in 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 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; andiii) a degradable retainer disposable in 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 in a predetermined passage of time inside a natural wellbore environment to release the permanent frac ball or the flow restrictor to move; andc) the permanent bridge plug or the permanent frac ball or the movable flow restrictor closes the flowbore in the first position to prevent the flow of fluid in either direction, and movement of the permanent bridge plug or the permanent frac ball or the movable flow restrictor between the first position and the second position after the degradable retainer degrades or dissolves allows for a one-directional upward flow of fluid through the flowbore; and the degradable retainer is positioned to press against the permanent bridge plug or the permanent frac ball or the movable flow restrictor so as to retain the permanent bridge plug or the permanent frac ball or the movable flow restrictor in the closed position until the degradable retainer degrades or dissolves. 18. 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;b) a flow valve assembled from a plurality of interchangeable components selectively disposable in the flowbore to control fluid flow therethrough, the plurality of interchangeable components including: i) a permanent bridge plug securable in 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 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; andiii) a degradable retainer disposable in 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 in a predetermined passage of time inside a natural wellbore environment to release the permanent frac ball or the flow restrictor to move; andc) the permanent frac ball or the movable flow restrictor in the first position allows a bi-directional flow of fluids through the flowbore, and movement of the permanent frac ball or the movable flow restrictor between the first position and the second position after the degradable retainer degrades or dissolves allows for a one-directional upward flow of fluid through the flowbore; and the degradable retainer is positioned to press against the permanent frac ball or the movable flow restrictor so as to retain the permanent frac ball or the movable flow restrictor in the open position until the degradable retainer degrades or dissolves. 19. A downhole tool for use in completing a well, comprising: a) a plug body selectively securable to a wellbore at a desired depth and having a flowbore formed therein;b) a non-dissolvable flow restrictor disposed in the flowbore and operable to restrict a flow of fluids through the flowbore;c) a time-dissolvable retainer pressed against the flow restrictor to retain the flow restrictor in a first position within the plug body, the retainer being dissolvable within a predetermined passage of time inside a natural wellbore environment to release the flow restrictor to move between the first position and a second position within the plug body; andd) the flow restrictor closes the flowbore in the first position to prevent the flow of fluid in either direction, and movement of the flow restrictor between the first position and the second position after the time-dissolvable retainer dissolves allows for a one-directional upward flow of fluid through the flowbore. 20. A downhole tool for use in completing a well, comprising: a) a plug body selectively securable to a wellbore at a desired depth and having a flowbore formed therein;b) a non-dissolvable flow restrictor disposed in the flowbore and operable to restrict a flow of fluids through the flowbore;c) a time-dissolvable retainer pressed against the flow restrictor to retain the flow restrictor in a first position within the plug body, the retainer being dissolvable within a predetermined passage of time inside a natural wellbore environment to release the flow restrictor to move between the first position and a second position within the plug body; andd) the time-dissolvable retainer is removable and replaceable with a permanent retainer to permanently close the valve and form a bridge plug; ande) the permanent retainer further comprises at least one metal ball. 21. 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;b) a flow valve comprising a plurality of interchangeable components selectively disposable in the flowbore to control fluid flow therethrough, the plurality of interchangeable components comprising: i) a non-dissolvable flow restrictor disposed in the flowbore and operable to restrict a flow of fluids through the flowbore; andii) a time-dissolvable retainer pressed against the flow restrictor to retain the flow restrictor in a first position within the plug body, the retainer being dissolvable within a predetermined passage of time inside a natural wellbore environment to release the flow restrictor to move between the first position and a second position within the plug body;c) the interchangeable components being selectively configurable to retain the flow valve in an open position allowing a bi-directional flow of fluids through the flowbore, or in a closed position preventing the flow of fluids in either direction through the flowbore, until after the time-dissolvable retainer dissolves; andd) the interchangeable components are secured within the flowbore with a non-dissolvable retainer allowing visibility of the time-dissolvable retainer, and wherein the time-dissolvable retainer is color coded according to the predetermined passage of time so as to allow a user to identify the predetermined passage of time by visually observing the color of the time-dissolvable retainer.