Swivel unit
AssigneeHughes Tool Company
InventorLawrence E. Helzer
Life of this patent
Estimating the term…
Abstract
A swivel unit for inflatable packer drill stem test tools has an outer housing with a lower end adapted for connection to the drill stem and an upper end. An inner shaft has a base portion received within the outer housing and has a neck portion which protrudes from the outer housing. Tapered roller bearings located between the outer housing and inner shaft at opposing ends of the inner shaft base portion rotatably mount the outer housing about the inner shaft. The outer housing has a shoulder formed in its external surface for receiving the derrick elevators and supporting the test tool assembly.
Claims5
A swivel unit for an inflatable packer drill stem test tool assembly, comprising:
- an outer housing having a lower end adapted for connection to said drill stem test tool and having an upper end;
- an inner shaft having a base portion received within said outer housing and having a neck portion protruding from said outer housing;
- bearing means for rotatably mounting said outer housing about said inner shaft;
- and
- wherein said outer housing has a downwardly facing shoulder formed in the exterior surface thereof for supporting said assembly.
A swivel unit for an inflatable packer drill stem test tool assembly, comprising:
- an outer housing having a lower end adapted for connection to said drill stem test tool and having an upper end;
- an inner shaft having a base portion received within said outer housing and having a neck portion protruding from said outer housing;
- tapered roller bearings located between said outer housing and inner shaft at opposing ends of said inner shaft base portion for rotatably mounting said outer housing about said inner shaft;
- and
- wherein said outer housing has a shoulder formed therein for supporting said assembly.
A swivel unit for an inflatable packer drill stem test tool assembly of the type used in a drill rig having a traveling block, a hook supported from the traveling block, and derrick elevators supported from the hook by elevator links, comprising:
- an outer housing having a lower end adapted for connection to said drill stem test tool and having an upper end;
- an inner shaft having a base portion received within said outer housing and having a neck portion protruding from said outer housing;
- tapered roller bearings located between said outer housing and inner shaft at opposing ends of said inner shaft base portion for rotatably mounting said outer housing about said inner shaft;
- and
- wherein said outer housing has a shoulder formed therein for receiving said derrick elevators and thereby supporting said assembly.
Dependencies are inferred from the claim text.