Hybrid threaded connection for expandable tubulars

Details Hybrid threaded connection for expandable tubulars Hybrid threaded connection for expandable tubulars

2004-07-07

2008-11-18

Hewitt, James M (Department: 3679)

Pipe joints or couplings

Particular interface

Tapered

C285S334000, C285S391000, C166S207000, C166S242600

Reexamination Certificate

active

07452007

ABSTRACT:
An expandable threaded connection between segments of expandable tubulars. The present invention utilizes two complementary thread segments. The first segment of the threaded connection utilizes standard box and pin threads. In the second segment of the threaded connection, material is removed from the stab flank of the pin threads to reduce the standard width of the pin threads, while the box threads of the second segment are standard thread width. The use of the reduced thread width in the pin threads of the second segment allows for a loose fit between the pin threads of the second segment and the box threads of the second segment. The loose fit between the pin and box threads of the second segment allows radial and axial movement between those threads without causing disengagement of the threaded connection during the expansion process.

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