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:
Mar. 17, 2015
Filed:
Dec. 09, 2011
Kristoffer Braekke, Stavanger, NO;
Geir Lunde, Sandnes, NO;
Roger Antonsen, Randaberg, NO;
I-Tec AS, Stavanger, NO;
Abstract
A valve system for providing fluid flow through radial openings disposed along an axial length of a tubular. The tubular comprises at least one valve group containing at least two valves operable by one drop ball. An insete.g. of standard grade steel provided in a harder linerin the opening provides an intermediate small opening for at least the time required to open all the remaining valves in the group. The small opening limits the pressure drop over the valve. When all valves are open, the insetsare eroded away by an abrasive material, e.g. a slurry used for hydraulic fracturing, and permanent full openings are created.