Downhole sliding sleeve combination tool

1. A downhole tool comprising:

a body having a bore formed therethrough;

a sliding sleeve at least partially disposed in the body;

one or more openings disposed about the body at a first end thereof; and

a valve assembly and a valve seat assembly at least partially disposed within the bore at a second end thereof, wherein:

in a first axial position, the sliding sleeve is adapted to block the one or more openings and maintain the valve assembly in an open position allowing bidirectional flow through the bore;

in a second axial position, the sliding sleeve is adapted to close the valve assembly, allowing unidirectional flow through the bore;

in a third axial position, the sliding sleeve is adapted to uncover the one or more openings thereby creating one or more of flowpaths between the bore and an exterior surface of the downhole tool, while permitting unidirectional flow through the bore; and

the sliding sleeve comprising one or more sleeve apertures that when aligned with the one or more openings disposed about the body, in the third axial position, create the one or more flowpaths.

2. The downhole tool of claim 1 , wherein the valve assembly comprises a pivotable sealing member, and wherein the sliding sleeve is axially displaced to permit the pivotable sealing member to pivot from the first position to the second position.

3. The downhole tool of claim 2 , wherein the pivotable sealing member comprises a frangible material.

4. The downhole tool of claim 2 , wherein the pivotable sealing member comprises a material selected from the group consisting of cast iron, cast aluminum, and ceramic.

5. The downhole tool of claim 2 , wherein the pivotable sealing member comprises a compound soluble water, organic acids, inorganic acids, organic bases, inorganic bases, organic solvents, or combinations thereof.

6. The downhole tool of claim 1 , wherein the valve seat assembly is of frustoconical shape.

7. The downhole tool of claim 1 , wherein a second end of the sliding sleeve comprises a complementary shape to the valve seat assembly, thereby permitting the formation of a liquid-tight seal when the second end of the sliding sleeve is proximate to the valve seat assembly.

8. The downhole tool of claim 1 , wherein the downhole tool is disposed on a casing string, and wherein an inside diameter defined by the bore of the downhole tool is greater than or equal to an internal diameter of the casing string.

9. A system for hydrocarbon production from a well, the system comprising:

a well bore;

a casing string comprising one or more casing sections and one or more combination tools, wherein each combination tool is the downhole tool of claim 1 .

10. The downhole tool of claim 9 , wherein the valve assembly comprises a pivotable sealing member, and wherein the internal sliding sleeve is axially displaced to permit the pivotable sealing member to pivot from a first position to a second position.

11. The downhole tool of claim 10 , wherein the pivotable sealing member comprises a frangible material.

12. The downhole tool of claim 10 , wherein the pivotable sealing member comprises cast iron, cast aluminum, ceramic, or combinations thereof.

13. The downhole tool of claim 9 , wherein the valve seat assembly is of frustoconical shape.

14. The downhole tool of claim 9 , wherein a second end of the sliding sleeve comprises a complementary shape to the valve seat assembly.

15. The downhole tool of claim 9 , wherein an inside diameter defined by the bore of the downhole tool is greater than or equal to an internal diameter of the casing string.