The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 29, 2019
Filed:
Nov. 24, 2014
Welltec Oilfield Solutions Ag, Zug, CH;
Lars Stæhr, Glostrup, DK;
Dean Richard Massey, Allerød, DK;
Welltec Oilfield Solutions AG, Zug, CH;
Abstract
An annular barrier to be expanded in an annulus between a well tubular structure and a wall of a borehole downhole, includes a tubular metal part for mounting as part of the well tubular structure having an outer face; an expandable sleeve surrounding the tubular metal part and having an inner face facing the tubular metal part and an outer face facing the wall of the borehole, each end of the expandable sleeve being connected with the tubular metal part; and an annular space between the inner face of the expandable sleeve and the tubular metal part, the annular space having a space pressure. The annular barrier has an anti-collapsing unit with an element movable at least between a first position and a second position, the anti-collapsing unit having first and second inlets and an outlet arranged to allow equalization.