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. 21, 2020
Filed:
Jun. 27, 2017
Welltec Oilfield Solutions Ag, Zug, CH;
Ricardo Reves Vasques, Allerød, DK;
Welltec Oilfield Solutions AG, Zug, CH;
Abstract
A drill string has a first part and a second part closer to a top of the well. The first part has a drilling head and an annular barrier with a tubular metal part, an expandable metal sleeve and an annular space between the inner face of the expandable metal sleeve and the tubular metal part. Drilling is commenced and then stopped when a loss of formation pressure is detected. A ball is dropped into the drill string and the drill string is pressurized. The expandable metal sleeve is expanded with pressure until the expandable metal sleeve abuts the inner face of the borehole. The second part of the drill string is separated from the first part and pulled out of the borehole. Cement is injected into the borehole above the first part to provide a cement plug above the first part.