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A fracturing system includes a fracturing spool that mounts onto a wellhead assembly for injecting fracturing fluid into a well beneath the wellhead assembly. An isolation sleeve is included with the fracturing system that couples to the fracturing spool and extends into the wellhead to isolate and

A fracturing system includes a fracturing spool that mounts onto a wellhead assembly for injecting fracturing fluid into a well beneath the wellhead assembly. An isolation sleeve is included with the fracturing system that couples to the fracturing spool and extends into the wellhead to isolate and protect portions of the wellhead assembly from the fracturing fluid. A seal is between the isolation sleeve and bore of the wellhead assembly, which is threaded to the isolation sleeve. Manipulating the threaded connection between the isolation sleeve and seal selectively positions the isolation sleeve to designated axial positions within the wellhead assembly.

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1. A fracturing assembly for use with a wellhead assembly comprising: a fracturing spool that is selectively mounted onto the wellhead assembly;a seal assembly axially supported in an axial bore in the fracturing spool; andan isolation sleeve comprising an end in selective communication with a suppl

1. A fracturing assembly for use with a wellhead assembly comprising: a fracturing spool that is selectively mounted onto the wellhead assembly;a seal assembly axially supported in an axial bore in the fracturing spool; andan isolation sleeve comprising an end in selective communication with a supply of fracturing fluid, a portion that extends into a main bore of the wellhead assembly and defines a barrier between the fracturing fluid and components in the wellhead assembly, and an outer surface with a threaded portion that engages threads on an inner surface of a load ring of the seal assembly, the load ring supporting the isolation sleeve within the wellhead assembly and the threaded portion having a length so that the isolation sleeve is adjustable to axial locations within the main bore by a rotation of the isolation sleeve relative to the load ring. 2. The fracturing assembly of claim 1, further comprising an anti-rotation screw radially disposed through a sidewall of the fracturing spool and having an end inserted into a groove formed in an outer surface of the seal assembly, so that the seal assembly is rotationally affixed to the fracturing spool. 3. The fracturing assembly of claim 2, further comprising a lockdown screw radially disposed through a sidewall of the fracturing spool and in contact with an end of the seal assembly distal from the groove and that exerts a force onto the seal assembly directed towards the groove. 4. The fracturing assembly of claim 1, wherein the seal assembly further includes an annular elastic compression seal stacked onto the load ring, an annular compression ring stacked onto the compression seal, passages formed axially in sidewalls of the load ring, compression seal and compression ring, fasteners inserted into the passages and that each have a lower end threaded into the load ring and an upper end in interfering contact with the compression ring. 5. The fracturing assembly of claim 1, wherein the wellhead assembly comprises a first wellhead assembly, and wherein the fracturing spool is selectively mounted on a second wellhead assembly having components at axial locations different from axial locations of components of the first wellhead assembly, and wherein the isolation sleeve is selectively repositioned by rotation and isolates the components in the second wellhead assembly from the fracturing fluid. 6. The fracturing assembly of claim 1, wherein the wellhead assembly comprises a production valve mounted on a tubing spool, and wherein the isolation sleeve extends through the production valve and into the tubing spool. 7. The fracturing assembly of claim 6, wherein the isolation sleeve extends past threads in the tubing spool and thereby defines a barrier between the fracturing fluid and the threads in the tubing spool. 8. The fracturing assembly of claim 1, wherein the wellhead assembly includes a tubing hanger, and wherein the isolation sleeve extends into the tubing hanger and sealingly engages and inner diameter of the tubing hanger. 9. The fracturing assembly of claim 1, wherein the isolation sleeve extends through the seal assembly, with a portion of the isolation sleeve located beyond each end of the seal assembly. 10. A fracturing assembly for use with wellhead assemblies comprising: a fracturing spool that selectively mounts onto the wellhead assemblies and has an axial bore that registers with main bores in each of the wellhead assemblies;an isolation sleeve in the fracturing spool to isolate fracturing fluid in the isolation sleeve from selected components at an axial location in a one of the wellhead assemblies, and that is adjustable to isolate the fracturing fluid from selected components in another one of the wellhead assemblies and that is at a different axial location; anda seal assembly disposed the axial bore in the fracturing spool, wherein the isolation sleeve has an outer surface with a threaded portion that engages threads on an inner surface of the seal assembly and having a length so that the isolation sleeve is adjustable to axial locations within the main bore, and wherein the seal assembly further includes an annular elastic compression seal stacked onto a load ring, an annular compression ring stacked onto the compression seal, passages formed axially in sidewalls of the load ring, compression seal and compression ring, fasteners inserted into the passages and that each have a lower end threaded into the load ring and an upper end in interfering contact with the compression ring. 11. The fracturing assembly of claim 10, further comprising anti-rotation screws in the fracturing spool for rotationally anchoring the isolation sleeve to the fracturing spool. 12. A method of fracturing a well comprising: providing a supply of fracturing fluid to a wellhead assembly mounted onto the well;landing a seal assembly in an axial bore in the fracturing spool, the seal assembly being axially supported by a shoulder of the fracturing spool, the seal assembly having a load ring with threads on an inner surface of the load ring;inserting an isolation sleeve into a main bore of the wellhead assembly to isolate components in the wellhead assembly from the fracturing fluid, the isolation sleeve being axially supported by the load ring and having an outer surface with a threaded portion that engages the threads of the load ring; andadjusting an axial position of the isolation sleeve within the main bore by rotating the isolation sleeve relative to the load ring. 13. The method of claim 12, wherein the wellhead assembly comprises a first wellhead assembly, the method further comprising inserting the isolation sleeve into a second wellhead assembly having components that are lower than the components in the first wellhead assembly, and adjusting the axial position of the isolation sleeve within a main bore of the second wellhead assembly to isolate the components in the second wellhead assembly from the fracturing fluid. 14. The method of claim 12, wherein the isolation sleeve is in a fracturing spool that is mounted onto the wellhead assembly, and wherein a seal is between the isolation sleeve and the fracturing spool.