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A blast joint swivel for use in a wellhead isolation tool includes a blast joint hanger mounted to a top of the wellhead isolation tool and a swivel body rotatably received in the blast joint hanger. The swivel body threadedly connects to a blast joint, which in turn threadedly connects to a top end

A blast joint swivel for use in a wellhead isolation tool includes a blast joint hanger mounted to a top of the wellhead isolation tool and a swivel body rotatably received in the blast joint hanger. The swivel body threadedly connects to a blast joint, which in turn threadedly connects to a top end of a tubing string suspended in a well. The blast joint swivel can also be displaced vertically over a limited range between upper and lower abutments.

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We claim: 1. A blast joint swivel, comprising: a blast joint hanger; and a swivel body rotatably supported within a central bore of the blast joint hanger, the swivel body defining an axial fluid passage with bottom threads for connection to a top end of a blast joint, the blast joint hanger suppor

We claim: 1. A blast joint swivel, comprising: a blast joint hanger; and a swivel body rotatably supported within a central bore of the blast joint hanger, the swivel body defining an axial fluid passage with bottom threads for connection to a top end of a blast joint, the blast joint hanger supporting the swivel body for unconstrained axial rotation relative to the blast joint hanger; and upper and lower abutments in the central bore of the blast joint hanger between which the swivel body is vertically displaceable without rotation of the swivel body or the blast joint hanger, the vertical displacement of the swivel body being at least equivalent to a vertical displacement of the blast joint when the blast joint is threadedly connected to a top of a tubing string supported in a well. 2. The blast joint swivel as claimed in claim 1 wherein the swivel body further comprises a lower annular shoulder that contacts the lower abutment and an upper annular shoulder that contacts the upper abutment to respectively limit the vertical displacement of the swivel body relative to the blast joint hanger. 3. The blast joint swivel as claimed in claim 1 wherein the upper abutment is formed by a bottom surface of a bearing in the central bore of the blast joint hanger and the lower abutment is formed by an annular shoulder of a collar threadedly connected to a bottom end of the blast joint hanger. 4. The blast joint swivel as claimed in claim 1 wherein the upper abutment is formed by an annular shoulder of a collar threadedly connected to a top end of the blast joint hanger and the lower abutment is formed by an annular shoulder in the central passage of the blast joint hanger. 5. The blast joint swivel as claimed in claim 1 wherein the blast joint hanger further comprises one of a stud pad and a flange to permit a high pressure fluid flow control component to be mounted thereto. 6. The blast joint swivel as claimed in claim 1 wherein the blast joint hanger further comprises a threaded top end to which an adapter spool is mounted, the adapter spool having a top end comprising one of a stud pad and a flange to permit a high pressure fluid flow control component to be mounted thereto. 7. The blast joint swivel as claimed in claim 1 wherein the blast joint hanger comprises: a first collar threadedly received in a top end of the central bore, the first collar including an annular shoulder providing the upper abutment and retaining an upper bearing for supporting the swivel body for rotation; a second collar threadedly received in a bottom end of the central bore, the second collar retaining a lower bearing for supporting the swivel body for rotation; and an annular shoulder in the central bore, the annular shoulder providing a spacer between the upper and lower bearings, and further providing the lower abutment. 8. The blast joint swivel as claimed in claim 7 wherein each of the first and second collars include seal grooves in an inner surface that faces an outer surface of the swivel body, the seal grooves receiving seals for inhibiting a migration of high pressure fluids to the bearings. 9. The blast joint swivel as claimed in claim 7 wherein the upper bearing and the lower bearing respectively comprise a needle bearing. 10. The blast joint swivel as claimed in claim 1 wherein the blast joint hanger comprises: a collar threadedly received in a bottom end of the central bore, the collar including an annular shoulder providing the lower abutment and retaining a lower bearing for supporting the swivel body for rotation; and a spacer ring above the lower bearing, the spacer ring retaining an upper bearing for supporting the swivel body for rotation, a bottom race of the upper bearing providing the upper abutment. 11. The blast joint swivel as claimed in claim 10 wherein an inner surface of the collar and an outer surface of a top end of the swivel body include seal grooves, the seal grooves receiving seals for inhibiting a migration of high pressure fluids to the upper and lower bearings. 12. A method of connecting a blast joint of a wellhead isolation tool to a tubing string suspended in a wellbore, the method comprising: mounting a blast joint swivel to a top end of a wellhead isolation tool and connecting the blast joint to a bottom end of a swivel body supported within the blast joint swivel for unconstrained rotation; hoisting the wellhead isolation tool over a wellhead of the well and lowering the wellhead isolation tool until a threaded bottom end of the blast joint contacts a threaded upper end of the tubing string and the swivel body is vertically displaced within the blast joint swivel until the swivel body abuts an upper abutment within the blast joint swivel; and rotating the blast joint to threadedly connect the blast joint to the tubing string without further vertically displacing the wellhead isolation tool. 13. A blast joint swivel, comprising: a blast joint hanger having a central bore, a top end adapted for the connection of an adapter flange or a fluid flow control component, and a bottom end adapted to be mounted to a fracturing head through which high-pressure fluids can be pumped into a well; a swivel body received within the central bore of the blast joint hanger for unconstrained rotational movement relative to the blast joint hanger and vertical displacement without rotation between upper and lower abutments within the central bore; and a tubular blast joint connected to a bottom end of the swivel body, a bottom end of the tubular blast joint being threaded for connection to a top end of the tubing string suspended in the well. 14. The blast joint swivel as claimed in claim 13, further comprising: a lower annular shoulder supported by the lower abutment restraining downward displacement of the swivel body relative to the blast joint hanger; and an upper annular shoulder spaced beneath the upper abutment, thereby limiting the vertical displacement of the swivel body relative to the blast joint hanger; whereby the blast joint can be vertically displaced without rotation at least a length of a threaded connection between the blast joint and a tubing string supported in the well. 15. The blast joint swivel as claimed in claim 14 wherein the vertical displacement of the tubular swivel body relative to the blast joint hanger is greater than the length of the threaded connection between the blast joint and the tubing string. 16. The blast joint swivel as claimed in claim 13 wherein the lower abutment is formed by an annular shoulder of the blast joint hanger. 17. The blast joint swivel as claimed in claim 13 wherein the lower abutment is formed by an annular shoulder of a collar threadedly connected to the blast joint hanger. 18. The blast joint swivel as claimed in claim 13 wherein the upper abutment is formed by an annular shoulder of a collar threadedly connected to the blast joint hanger. 19. The blast joint swivel as claimed in claim 13 further comprising at least one bearing disposed between the tubular swivel body and the blast joint hanger to facilitate rotation of the tubular swivel body relative to the blast joint hanger. 20. The blast joint swivel as claimed in claim 19 wherein the at least one bearing is a needle bearing.