Offshore platform rigs adapting to weight-space restrictions for floaters

摘要

Platform rigs have played an important role in the development of existing oil and gas fields since the 1970s. Although never held in the limelight like other offshore drilling units, such as drillships, semisubmersibles, or jackups, these workhorse machines make up 30% of the total workover and drilling business around the world's oceans. An important distinction about these rigs is that more than half are owned by the lease operator or a country's oil and gas regulating body. Currently, there are about 300 conventional platform rigs, of which about 40% are owned and marketed by drilling and workover contractors.