Gravel pack isolation system

US6302208A · kind A · utility

Inventors

• David Walker · Lafayette, US
• William Mark Richards · Flower Mound, US

Key dates

• Filing date: May 14, 1999
• Grant date: Oct 16, 2001
• Expiry date: May 14, 2019

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B34/12
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

An isolation system having: an isolation string, wherein the isolation string has a packing assembly which secures the isolation string in a wellbore casing, wherein the isolation string has a production screen which allows production fluid to pass into the isolation string; an isolation sleeve which slides within the isolation string between open and closed positions, wherein the open position allows fluid communication between the production screen and an interior portion of the isolation string and the closed position prevents fluid communication between the production screen and an interior portion of the isolation string, wherein the isolation sleeve comprises at least one isolation valve which is coupled within the isolation sleeve, wherein the at least one isolation valve is movable between open and closed positions; a locking device which locks and unlocks the isolation sleeve in an open position, wherein the locking device comprises a trigger that secures the isolation sleeve to the isolation string before the trigger is activated and releases the isolation sleeve from the isolation string after the trigger is activated, wherein the trigger comprises: a piston collar havin…