A U.S. bankruptcy judge has reopened bidding for the parent company of Venezuela-owned oil refiner Citgo Petroleum in an effort to secure a higher price tag as creditors scramble to collect from the sale of the South American country’s most-prized foreign asset.

More than a dozen entities have brought claims against Venezuela that total more than $20 billion, only part of which would be satisfied via the sale of Citgo, the seventh-largest oil refiner in the U.S.