Apache Corp., the US oil and gas company operating on five continents, and Santos plan to build an $800 million natural gas project in Western Australia to benefit from rising prices for the fuel. The partners have approved the Devil Creek project, which will tap gas from the offshore Reindeer field for supply to customers in Western Australia, Tim Wall, managing director of Apache's Australian unit, said in an interview. The project may start up in 2010, Apache says on a Web site on the project.