Abu Dhabi National Oil Company (ADNOC) has invited companies to submit technical and commercial bids by 22 October for a contract to carry out a pre-front-end engineering and design (FEED) study for a major gas reinjection project at Habshan. The project, entailing recovery and utilisation of carbon dioxide (CO2) for enhanced oil recovery at the Bab Thamama B oil reservoir, is aimed at reinjecting about 100 million cubic feet a day of gas into the onshore oil field.