One trip tubular expansion and recess formation apparatus and method
AssigneeBaker Hughes Incorporated
InventorsGraham E. Farquhar, Robert C. Smith
Life of this patent
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Abstract
A one trip top to bottom expansion to form a lower end recess on a tubular is described using two swages of different dimensions. The smaller swage is run down hole with the larger swage behind it in a locked collapsed position. When the proper depth is reached the leading swage hits a no go. A pickup force with dogs engaged in a groove releases the lock on the larger swage at which point applied pressure sets an anchor, extends the larger swage to take over the expansion for the recess at the lower end of the tubular. An emergency release is provided to pull out of the hole if the swage cannot complete the task.
Claims19
A method of creating a recess fully located at the lower end of a tubular string having an initial rounded internal diameter to accept another string to be expanded into the recess, comprising:
- running in an expansion assembly into the string;
- using a leading swage to expand said initial rounded internal diameter of the string as the assembly advances into the string;
- releasing a trailing swage after said expansion with said leading swage;
- and
- continuing expansion of the string to a larger size than said leading swage with said following swage moving in the same direction as said leading swage to form the recess adjacent the lower end of the string.
Dependencies are inferred from the claim text.