Patent ID: 7134488
Filing Date: 2006-11-14
Classification: E21B

Abstract:
1. An isolation assembly for associating a downhole tool with coiled tubing of a well bore, comprising: a housing adapted to associate the downhole tool with the coiled tubing, the housing having an inner diameter in fluid communication with an outer diameter via a housing port; a shuttle slidably disposed within the housing, the shuttle having an inner diameter in fluid communication with an outer diameter via a shuttle port; a check valve within the isolation assembly adapted to selectively preclude fluid communication through the isolation assembly, the check valve being a flapper check valve pivotally attached to the shuttle, the flapper check valve adapted to open to allow fluid communication through the isolation assembly when a positive differential pressure supplied via the coiled tubing exists above the flapper check valve, the flapper check valve adapted to close when a positive differential pressure exists below the flapper check valve; and a biasing means adapted to bias the shuttle within the housing such that the housing port is out of alignment with the shuttle port precluding fluid communication therethrough.