WorldOil Drillers boost U.S. oil rigs for first time in 30 weeks Drillers put rigs in U.S. oil fields back to work for the first time since December, driving down crude futures on speculation that an unprecedented retreat from the country’s prolific shale formations is ending. PetroRio buys Petrobras’ stake in Bijupirá, Salema fieldsá-salema-fields PetroRio has signed an agreement to acquire 20% of the rights and obligations of the concession contracts for Bijupirá and Salema fields from Petrobras. Hess completes Bakken midstream sale, establishes joint venture Hess has completed the sale of a 50% interest in its Bakken midstream assets to Global Infrastructure Partners for a cash consideration of $2.675 billion, the company announced Wednesday. BP pays record $18.7 billion to settle Macondo claims BP Plc will pay a record $18.7 billion to resolve claims by the U.S. and five states along the Gulf of Mexico related to the 2010 oil spill. Summit ESP launches Sentry Well Surveillance service Summit ESP has launched its Sentry(SM) Well Surveillance services, a real time Electrical Submersible Pump and Optimization Service. Elk-Antelope joint venture selects LNG project sites InterOil Corporation and the PRL 15 joint venture participants have unanimously endorsed recommendations from Total SA for key project infrastructure sites for development of Elk-Antelope gas field in Papua New Guinea. CIS Group completes subsea piling operation in North Sea Conductor Installation Services (CIS) has completed a subsea piling operation for Subsea 7 in the UK North Sea. Emerson improves offering with Yggdrasil acquisition Emerson Process Management has acquired Norwegian company Yggdrasil, a provider of flow assurance and production optimization software. Aqualis Offshore to open South Korea office Offshore marine and engineering consultancy Aqualis Offshore is to open an office in Busan, South Korea, following increased demand for the company’s services. China wary of closer Russia energy ties, ex-Cnooc economist says China is wary of expanding energy investments in Russia because closer ties with the Kremlin could harm its relations with the U.S., according to a former researcher at China’s biggest offshore explorer. Oil steady after biggest drop since April as U.S. supplies rise Oil was steady after the biggest decline since April as an unexpected gain in U.S. crude stockpiles signaled a supply glut may persist.