... operated barrier valve removes any need for running control lines to surface. Surface applied pressure and time combinations were used to command remote actuation of the valve. The factors that must be considered when determining these commands are also discussed. The successful field deployment discussed...

... of a coded tag is not feasible. Using this technology an upper completion system comprising packer, circulation sleeve and downhole barrier valve has been developed which is controlled by a single RFID module, thus providing a means to remotely control the installation, reducing running costs...

... is desired to provide a barrier valve that is resident in the tubing string that allows the section of tubing between it and the wellhead to act as the lubricator. This barrier valve must be bidirectional in sealing capability to hold pressure from both above and below the valve. This paper discusses a new...