"The Future Growth and Wellhead Pressure Management Project represents an excellent opportunity for the company," said Chevron Chairman and Chief Executive Officer John Watson. "The project builds on a record of strong performance at Tengiz and will add value for Chevron and its stockholders."

The company said this week in a presentation on its website that the decision on expanding the Tengiz development in Kazakhstan will be made in mid-2016. Installing 4,500 camp beds for construction crews is done and port dredging 25 percent complete, it said. The project may cost as much as $40 billion and add crude supply equivalent to that of Libya. The investment was put on hold last year after cost estimates ballooned amid plunging oil prices.