EARTH-BORING TOOLS FOR COUPLING TO CASINGS AND RELATED SYSTEMS AND METHODS

1 . A downhole tool assembly, comprising:

a first casing section configured to be inserted into a borehole;

a second casing section configured to be inserted into the borehole; and

an earth-boring tool comprising at least one blade located between the first casing section and the second casing section;

wherein the at least one blade comprises one or more cutting elements and is configured to remove material from a downhole formation.

2 . The downhole tool assembly of claim 1 , wherein the at least one blade comprises a gauge section defining an outside diameter of the earth-boring tool.

3 . The downhole tool assembly of claim 2 , wherein the outside diameter of the earth-boring tool is between 100% and 150% of an outside diameter of at least one of the first casing section and the second casing section.

4 . The downhole tool assembly of claim 3 , wherein the outside diameter of the earth-boring tool is less than an inside diameter of the borehole.

5 . The downhole tool assembly of claim 1 , wherein the first casing section is coupled to a casing bit at an end of the first casing section opposite the earth-boring tool.

6 . The downhole tool assembly of claim 1 , wherein the earth-boring tool comprises a coupler configured to couple the first casing section to the second casing section.

7 . The downhole tool assembly of claim 1 , wherein the one or more cutting elements comprise polycrystalline diamond cutting elements.

8 . The downhole tool assembly of claim 1 , wherein the at least one blade comprises hardfacing.

9 . The downhole tool assembly of claim 1 , further comprising a third casing section and a second earth-boring tool located between the second casing section and the third casing section.

10 . The downhole tool assembly of claim 9 , further comprising at least four earth-boring tools, wherein each of the at least four earth-boring tools are coupled between different casing sections along a casing string.

11 . The downhole tool assembly of claim 1 , wherein the earth-boring tool is coupled to at least one of the first casing section and the second casing section with a threaded connection.

12 . The downhole tool assembly of claim 11 , wherein the threaded connection further comprises a weld.

13 . A method of securing a casing string in an earth formation comprising:

inserting a casing string into an earth formation;

rotating the casing string;

removing an obstruction in a wellbore with an earth-boring tool coupled between at least two segments of casing in the casing string by rotation of the casing string; and

securing the casing string and the earth-boring tool in place within the wellbore.

14 . The method of claim 13 , further comprising drilling the wellbore with a casing shoe coupled to a first segment of casing in the casing string.

15 . The method of claim 13 , wherein inserting the casing string into the formation comprises inserting the casing string into an already drilled wellbore.

16 . The method of claim 13 , wherein securing the casing string and the earth-boring tool comprises providing zonal isolation for the casing string with cement.

17 . The method of claim 13 , wherein securing the casing string and the earth-boring tool further comprises flowing cement between junk slots of the earth-boring tool.

18 . A method of manufacturing an earth-boring tool comprising:

forming a body of the earth-boring tool comprising:

at least one blade extending radially from the body;

a bore extending through the body along a longitudinal axis of the body; and

threads on both a first end of the body and a second end of the body, wherein the threads are configured to couple the body between segments of casing in a casing string.

19 . The method of claim 18 , further comprising forming pockets on the at least one blade.

20 . The method of claim 19 , further comprising securing cutting elements within the pockets on the at least one blade.