Remote tool actuation using data carrying tags

摘要

A method and apparatus for operating a downhole tool 20. The method comprises the steps of providing a conduit 26 for the passage of fluid therethrough. The conduit 26 comprises at least one reader which can read data and which is also arranged for the passage of fluid therethrough. The method further includes coupling a downhole tool 20 to the or each reader and providing at least one tag. The or each tag is capable of containing data. The method also includes moving the or each tag within the conduit 26 and at least partially through the reader such that the reader is capable of reading data from the tag when the tag passes through the reader. This method enables remote operation of the downhole tool 20. The invention also provides an antenna for use in a downhole tubular. The antenna comprises a generally cylindrical housing and a coiled conductor located within a portion of the housing and separated therefrom by insulating material. The portion of housing has a greater internal diameter than an external diameter of the coiled conductor.