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Methods and apparatus provides an improved shunt nozzle which is part of an alternative pathway for a slurry to by-pass an obstruction such as a sand bridge during gravel packing. The nozzle includes a hardened insert that lines a surface of an aperture in a shunt. A jacket secured to the shunt rec

Methods and apparatus provides an improved shunt nozzle which is part of an alternative pathway for a slurry to by-pass an obstruction such as a sand bridge during gravel packing. The nozzle includes a hardened insert that lines a surface of an aperture in a shunt. A jacket secured to the shunt receives the insert, which is trapped from movement relative to the jacket.

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What is claimed is: 1. A nozzle assembly for use in a gravel pack tool having an aperture through a wall of a shunt along the tool, comprising: an insert having a proximal end at least partially lining the aperture, wherein the insert has an outward facing shoulder distal to the aperture; and a jac

What is claimed is: 1. A nozzle assembly for use in a gravel pack tool having an aperture through a wall of a shunt along the tool, comprising: an insert having a proximal end at least partially lining the aperture, wherein the insert has an outward facing shoulder distal to the aperture; and a jacket concentrically surrounding the insert, wherein the jacket is secured to an outer surface of the wall and has a face in abutment with the shoulder, wherein the shoulder of the insert is trapped against the face of the jacket to prevent movement of the insert into the aperture. 2. The assembly of claim 1, wherein the insert is longer than the jacket. 3. The assembly of claim 1, wherein the face of the jacket is a distal terminus of the jacket. 4. The assembly of claim 1, further comprising an open cap secured to an outer surface of the jacket at a distal end of the jacket, wherein the outward facing shoulder is disposed between an inward facing shoulder of the cap and the face of the jacket. 5. The-assembly of claim 1, further comprising an open cap threaded to an outer surface of the jacket, wherein the outward facing shoulder is disposed between an inward facing shoulder of the cap and the face of the jacket. 6. The assembly of claim 5, wherein the face of the jacket is a distal terminus of the jacket. 7. The assembly of claim 1, further comprising an annular cap secured to a distal end of the jacket and having an inward facing shoulder abutting a distal terminus of the insert. 8. The assembly of claim 1, wherein the insert is removable without removing the jacket from the tool. 9. The assembly of claim 1, further comprising a reference feature disposed on the jacket for mating with a rotational alignment feature disposed on the insert. 10. The assembly of claim 9, wherein the reference feature is a pin on the face of the jacket and the alignment feature is a slot along the outward facing shoulder of the insert. 11. The assembly of claim 9, wherein the insert is constructed from a carbide material. 12. The assembly of claim 1, wherein the outward facing shoulder is defined by an enlarged outer diameter portion. 13. The assembly of claim 12, wherein the enlarged outer diameter is larger than an inner diameter of the aperture. 14. The assembly of claim 12, further comprising an open cap secured to an outer surface of the jacket at a distal end of the jacket. 15. The assembly of claim 14, wherein the outward facing shoulder is disposed between an inward facing shoulder of the cap and the face of the jacket. 16. The assembly of claim 12, wherein the face of the jacket is a distal terminus of the jacket. 17. The assembly of claim 12, wherein the insert is removable without removing the jacket from the tool. 18. The assembly of claim 12, further comprising a reference feature disposed on the jacket for mating with a rotational alignment feature disposed on the insert. 19. The assembly of claim 18, wherein the reference feature is a pin on the face of the jacket and the alignment feature is a slot along the outward facing shoulder of the insert. 20. An apparatus for use in a wellbore, comprising: a wellscreen assembly; at least one shunt disposed on the wellscreen assembly and having an aperture through a wall of the shunt; an insert having a proximal end at least partially lining the aperture, wherein the insert has an outward facing shoulder distal to the aperture; a jacket concentrically surrounding the insert, wherein a first end of the jacket is secured to an outer surface of the wall and a second end of the jacket terminates in abutting contact with the shoulder; and an open cap secured to the jacket, wherein an inward facing shoulder of the cap abuts a distal terminus of the insert. 21. The apparatus of claim 20, wherein at least substantially an entire length of an inner diameter of the jacket is lined by the insert. 22. The apparatus of claim 20, wherein the insert is rotationally keyed with respect to the jacket. 23. The apparatus of claim 20, wherein the cap is threaded to the jacket. 24. The apparatus of claim 20, wherein the insert is constructed of a material substantially harder than a material of the shunt. 25. A nozzle assembly for use in a gravel pack tool having an aperture through a wall of a shunt along the tool, comprising: an insert having a proximal end at least partially lining the aperture, wherein the insert has an enlarged outer diameter at a distal end of the insert relative to the aperture; a jacket concentrically surrounding the insert, wherein the jacket is secured to an outer surface of the wall at a first end and has an inner diameter smaller than the enlarged outer diameter of the insert, which abuts a second end of the jacket at the enlarged outer diameter; and an open cap secured to the second end of the jacket and extending beyond the enlarged outer diameter of the insert, wherein an opening through the cap has a restricted diameter smaller than the enlarged outer diameter of the insert, which is thereby trapped relative to the jacket. 26. The apparatus of claim 25, wherein the cap is threaded to an outer surface of the jacket. 27. The apparatus of claim 25, wherein the insert is removable without removing the jacket from the tool. 28. A nozzle assembly for use in a gravel pack tool having an aperture through a wall of a shunt along the tool, comprising: an insert having a proximal end at least partially lining the aperture, wherein the insert has an outward facing shoulder distal to the aperture; and a jacket concentrically surrounding the insert, wherein the jacket is secured to an outer surface of the wall and has a face in abutment with the shoulder, wherein the insert is longer than the jacket. 29. A nozzle assembly for use in a gravel pack tool having an aperture through a wall of a shunt along the tool, comprising: an insert having a proximal end at least partially lining the aperture, wherein the insert has an outward facing shoulder distal to the aperture; and a jacket concentrically surrounding the insert, wherein the jacket is secured to an outer surface of the wall and has a face in abutment with the shoulder, wherein the face of the jacket is a distal terminus of the jacket. 30. A nozzle assembly for use in a gravel pack tool having an aperture through a wall of a shunt along the tool, comprising: an insert having a proximal end at least partially lining the aperture, wherein the insert has an outward facing shoulder distal to the aperture; a jacket concentrically surrounding the insert, wherein the jacket is secured to an outer surface of the wall and has a face in abutment with the shoulder; and an open cap secured to an outer surface of the jacket at a distal end of the jacket, wherein the outward facing shoulder is disposed between an inward facing shoulder of the cap and the face of the jacket. 31. A nozzle assembly for use in a gravel pack tool having an aperture through a wall of a shunt along the tool, comprising: an insert having a proximal end at least partially lining the aperture, wherein the insert has an outward facing shoulder distal to the aperture; a jacket concentrically surrounding the insert, wherein the jacket is secured to an outer surface of the wall and has a face in abutment with the shoulder; and an open cap threaded to an outer surface of the jacket, wherein the outward facing shoulder is disposed between an inward facing shoulder of the cap and the face of the jacket. 32. The assembly of claim 30, wherein the face of the jacket is a distal terminus of the jacket. 33. A nozzle assembly for use in a gravel pack tool having an aperture through a wall of a shunt along the tool, comprising: an insert having a proximal end at least partially lining the aperture, wherein the insert has an outward facing shoulder distal to the aperture; a jacket concentrically surrounding the insert, wherein the jacket is secured to an outer surface of the wall and has a face in abutment with the shoulder; and an annular cap secured to a distal end of the jacket and having an inward facing shoulder abutting a distal terminus of the insert. 34. A nozzle assembly for use in a gravel pack tool having an aperture through a wall of a shunt along the tool, comprising: an insert having a proximal end at least partially lining the aperture, wherein the insert has an outward facing shoulder distal to the aperture; and a jacket concentrically surrounding the insert, wherein the jacket is secured to an outer surface of the wall and has a face in abutment with the shoulder, wherein the insert is removable without removing the jacket from the tool. 35. A nozzle assembly for use in a gravel pack tool having an aperture through a wall of a shunt along the tool, comprising: an insert having a proximal end at least partially lining the aperture, wherein the insert has an outward facing shoulder distal to the aperture; a jacket concentrically surrounding the insert, wherein the jacket is secured to an outer surface of the wall and has a face in abutment with the shoulder; and a reference feature disposed on the jacket for mating with a rotational alignment feature disposed on the insert. 36. The assembly of claim 35, wherein the reference feature is a pin on the face of the jacket and the alignment feature is a slot along the outward facing shoulder of the insert. 37. The assembly of claim 35, wherein the insert is constructed from a carbide material.