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. 06, 1999
Filed:
Apr. 14, 1997
Robert M Beirute, Tulsa, OK (US);
John W Kearns, Jr, Tulsa, OK (US);
Amoco Corporation, Chicago, IL (US);
Abstract
A user-friendly reverse circulation float equipment tool and process permit the application of reverse circulation cementing in shallow or deeper wells, without having to use an inner string. The reverse circulation float equipment tool can have: an upper section with a ball-activated upper valve, a lower section with a ball-activated lower valve, and an intermediate ball chamber between the upper and lower sections to contain the ball in a reverse mode. The reverse circulation float equipment tool and process allow circulation in the normal and reverse circulation modes while running the casing and during hole conditioning. After the reverse circulation job, the convenient reverse circulation float equipment tool and process allow closing of the bottom of the casing to prevent U-tubing of the cement slurry. This will also facilitate having the casing in radial compression during the time required to set the cement in the annulus, between the casing and wall of the well bore, to minimize the formation of a micro-annulus during cement curing.