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:
Apr. 09, 2019
Filed:
May. 19, 2015
Welltec Oilfield Solutions Ag, Zug, CH;
Paul Hazel, Aberdeeen, GB;
Welltec Oilfield Solutions AG, Zug, CH;
Abstract
The present invention relates to a downhole string () for drilling through a low pressure zone (Zlow) in a formation () in a well (), comprising a drawdown casing () having a first end () closest to a top () of the well and a second end (), and an operational tool () connected to the second end of the drawdown casing, wherein the downhole string further comprises an annular barrier () having an expandable metal sleeve () surrounding the drawdown casing, each end of the expandable metal sleeve being connected with the drawdown casing, the expandable metal sleeve being adapted to contact a wall () of a borehole () or another casing so that the drawdown casing can rotate and slide in relation to the annular barrier after expansion of the expandable sleeve. Furthermore, the present invention relates to a downhole system and to a downhole method.