Patent ID: 11953122
Assignee: HYDRIL COMPANY
Field: Civil engineering (Other fields)
Classification: CPC F  E | IPC F

Claim 4:
5. A connection comprising:
a first expandable tubular member comprising a first screw threadform defined by a first plurality of crests, a first plurality of roots, and a first plurality of flanks, wherein each flank separates each crest from each root, and wherein the first plurality of crests and roots are substantially axial to the first expandable tubular member and the first plurality of flanks are substantially radial to the first expandable tubular member; and
a second expandable tubular member comprising a second screw threadform defined by a second plurality of crests, a second plurality of roots, and a second plurality of flanks, wherein each flank separates each crest from each root, and wherein the second plurality of crests and roots are substantially axial to the second expandable tubular member and the second plurality of flanks are substantially radial to the second expandable tubular member,
wherein, upon engagement of the first threadform with the second threadform in a first position, the first expandable tubular member and the second expandable tubular member are configured to connect such that:
the first plurality of roots abuts the second plurality of crests,
the second plurality of roots abuts the first plurality of crests,
clearances are formed between the first plurality of flanks and the second plurality of flanks, and
a first flank and a second flank of the first plurality of flanks define a first groove of the first expandable tubular member with a first clearance width, and a third flank and a fourth flank of the first plurality of flanks define a second groove of the first expandable tubular member with a second clearance width, and the first clearance width and the second clearance width are substantially similar; and

wherein the first expandable tubular member and the second expandable tubular member are configured to radially expand to a second position; and
wherein the clearances are axially narrower in the second position than in the first position.