Drill bit nozzle assembly and insert assembly including a drill bit nozzle assembly

1. A nozzle pocket insert assembly for use with a steel body bit, the nozzle pocket insert assembly comprising:

a substantially tubular outer sleeve having threads formed on an inner wall of the substantially tubular outer sleeve;

a substantially tubular nozzle comprising an erosion-resistant material and disposed in the substantially tubular outer sleeve proximate an exterior surface of a steel bit body, wherein threads formed on an outer wall of the substantially tubular nozzle at least partially engage with the threads of the substantially tubular outer sleeve;

a substantially tubular sleeve comprising an erosion-resistant material and disposed in the substantially tubular outer sleeve in longitudinally adjacent substantially abutting relationship to the substantially tubular nozzle;

an annular groove formed in at least one of an inner wall of the substantially tubular outer sleeve laterally adjacent the substantially tubular nozzle and an outer wall of the substantially tubular nozzle;

another annular groove formed in at least one of the inner wall of the substantially tubular outer sleeve laterally adjacent the substantially tubular sleeve and an outer wall of the substantially tubular sleeve;

a further annular groove formed in an outer wall of the substantially tubular outer sleeve; and

at least one annular seal disposed in the annular groove, at least another annular seal disposed in the another annular groove, and a further annular seal disposed in the further annular groove, wherein the further annular seal is configured to be in sealing engagement with a wall of a nozzle pocket formed in the steel bit body.

2. The nozzle pocket insert assembly of claim 1 , wherein the annular groove and the another annular groove are formed in the inner wall of the substantially tubular outer sleeve.

3. The nozzle pocket insert assembly of claim 1 , wherein the threads of the substantially tubular outer sleeve are formed between the annular groove and one end of the substantially tubular outer sleeve.

4. The nozzle pocket insert assembly of claim 1 , wherein the erosion-resistant material of the substantially tubular nozzle and the substantially tubular sleeve is selected from the group consisting of a metal carbide and a ceramic.

5. The nozzle pocket insert assembly of claim 1 , wherein the erosion-resistant material of the substantially tubular nozzle and the substantially tubular sleeve comprises tungsten carbide.

6. The nozzle pocket insert assembly of claim 1 , wherein the annular seals comprise at least one elastomer.

7. The nozzle pocket insert assembly of claim 1 , wherein the annular grooves are of substantially rectangular transverse cross-section.

8. The nozzle pocket insert assembly of claim 1 , wherein the substantially tubular sleeve comprises an annular flange at one end thereof, and the annular flange abuts an annular shoulder formed in the inner wall of the substantially tubular outer sleeve.

9. The nozzle pocket insert assembly of claim 8 , wherein a portion of the substantially tubular sleeve extends beyond an end of the substantially tubular outer sleeve.

10. The nozzle pocket insert assembly of claim 1 , further including a steel bit body with a nozzle pocket formed therein, wherein the substantially tubular outer sleeve is disposed in the nozzle pocket with the annular seal carried in the annular groove in the outer wall of the substantially tubular outer sleeve in sealing engagement with a wall of the nozzle pocket.

11. The nozzle pocket insert assembly of claim 1 , wherein an outer wall of the substantially tubular outer sleeve includes an annular retainer groove therein, and further comprising a resilient, radially expandable retainer disposed therein.

12. The nozzle pocket insert assembly of claim 11 , further including a steel bit body with a nozzle pocket formed therein, wherein the substantially tubular outer sleeve is disposed in the nozzle pocket with a portion of the radially expandable annular retainer received in an annular retainer groove formed in a wall of the nozzle pocket.

13. The nozzle pocket insert assembly of claim 1 , further comprising a steel bit body having a nozzle pocket formed therein, the substantially tubular outer sleeve being received in the nozzle pocket, and secured therein by at least one weld between an end of the substantially tubular outer sleeve and the steel bit body.

14. The nozzle pocket insert assembly of claim 13 , wherein the at least one weld comprises an annular weld bead between the end of the substantially tubular outer sleeve and the steel bit body.

15. The nozzle pocket insert assembly of claim 13 , wherein the nozzle pocket comprises an annular shoulder proximate an inner end thereof, and another end of the substantially tubular outer sleeve abuts the annular shoulder.

16. The nozzle pocket insert assembly of claim 13 , wherein the substantially tubular outer sleeve comprises one of a steel and a stainless steel.

17. The nozzle pocket insert assembly of claim 1 , further comprising at least one relief groove or aperture extending between an exterior and an interior of at least one of the substantially tubular sleeve and the substantially tubular nozzle longitudinally between the at least one annular seal and the at least another annular seal.

18. A nozzle pocket insert assembly for use with a subterranean drill bit, the nozzle pocket insert assembly comprising:

a unitary, substantially tubular outer sleeve;

a substantially tubular nozzle comprising an erosion-resistant material and disposed in the substantially tubular outer sleeve proximate an exterior surface of a steel bit body;

a substantially tubular sleeve comprising an erosion-resistant material and disposed in the substantially tubular outer sleeve in longitudinally adjacent substantially abutting relationship to the substantially tubular nozzle;

an annular groove formed in at least one of an inner wall of the substantially tubular outer sleeve and an outer wall of the substantially tubular nozzle;

another annular groove formed in the inner wall of the substantially tubular outer sleeve; and

at least one annular seal disposed in the annular groove, at least another annular seal disposed in the another annular groove, and a further annular seal disposed in a further annular groove formed in an outer wall of the substantially tubular outer sleeve.

19. A nozzle pocket insert assembly for use with a subterranean drill bit, the nozzle pocket insert assembly comprising:

a substantially tubular nozzle comprising an erosion-resistant material;

a substantially tubular sleeve comprising an erosion-resistant material and an annular flange at an end thereof;

a substantially tubular outer sleeve having the substantially tubular nozzle and the substantially tubular sleeve disposed therein, wherein an end of the substantially tubular nozzle abuts the end of the substantially tubular sleeve comprising the annular flange, the substantially tubular outer sleeve comprising:

a first end sized and configured to be positioned adjacent to an exterior surface of a bit body and to enable the substantially tubular nozzle to be inserted into the substantially tubular outer sleeve through an opening in the first end;

an opposing, second end configured to be positioned proximate to a drilling fluid chamber within the bit body; and

an annular shoulder formed in the inner wall of the substantially tubular outer sleeve proximate to the second end, a portion of the annular shoulder abutting a portion of the annular flange of the substantially tubular sleeve;

an annular groove formed in at least one of an inner wall of the substantially tubular outer sleeve and an outer wall of the substantially tubular nozzle;

another annular groove formed in the inner wall of the substantially tubular outer sleeve; and

at least one annular seal disposed in the annular groove and at least another annular seal disposed in the another annular groove.

20. The nozzle pocket insert assembly of claim 19 , wherein an outer wall of the substantially tubular outer sleeve includes an annular groove therein, and further comprising an annular seal disposed therein.