Offshore Drilling Rigs: How Offshore Drilling Rig Operations Work in Harsh Ocean Environments Drillships are marine vessels with dual derrick cranes used for exploratory well drilling in remote ultra-deepwater locations beyond the reach of platform and jackup rigs, typically in over 5,000 feet of water. Rather than having legs that rest on the seafloor, offshore drilling rigs remain... https://www.coherentmarketinsights.com/market-insight/offshore-drilling-rigs-market-759