METHOD OF INSTALLING AND RETRIEVING MULTIPLE MODULES FROM A RISER STRING

摘要

A method comprising the steps of: installing multiple modules in an internal flow passage extending longitudinally through a riser string, the modules being installed in the flow passage between opposite end connections of the riser string; inserting a tubular string through an interior of each of the modules; and then simultaneously retrieving the multiple modules from the flow passage on the tubular string.