China Oilfield Service
In 2017, the states of Alaska, California, Connecticut, Florida, Georgia, Iowa, Mississippi, North Carolina, Ohio, Pennsylvania South Dakota and Texas listed China Oilfield Services on its Iran scrutinized companies list rendering China Oilfield Service ineligible for investment and/or state contracting.
August 2017 - COSL Singapore Ltd (“COSL Singapore”), an oilfield services company located in Singapore and a subsidiary of China Oilfield Service Limited, has agreed to pay $415,350 to settle its potential civil liability for 55 apparent violations of the Iranian Transactions and Sanctions Regulations
"The oil rigs currently operating in Iranian waters mostly work for Iranian state-owned companies. The rigs are owned by a variety of foreign firms, including Norway's Sinvest, London-based Foresight Group, China Oilfield Service, Japan Drilling and Saipem, a subsidiary of Italian oil giant ENI. Industry sources said they would probably be certified by either Lloyd's or Bureau Veritas. BV did not respond to inquiries." (The Washington Post, "Congress sees shipping-certification firms as tool to tighten Iran noose," 12/5/2011)