China Petroleum & Chemical Corp. , or Sinopec, has doubled production at its Iranian oil project, according to people familiar with the matter, a rare success as the country struggles to revive its flagging oil output. The push is part of a broader attempt by China and Iran to mend fences after the cancellation of a $2.5 billion oil-field deal with another Chinese state-owned giant, China National Petroleum Corp. Production at the Sinopec-run Yadvaran project, near the Iraqi border, has increased to about 50,000 barrels a day from 25,000 barrels a day in early April, the people said. Sinopec didn’t responded to repeated requests for comment. Sinopec is also pushing to start a new phase to boost output to 135,000 barrels a day, people familiar with the matter said. The increase will be welcomed by Iran where production has been heavily hit by international sanctions. Iranian crude output […]