WILMINGTON, Del. - A creditor in the Chapter 11 bankruptcy of oil and gas company Green Field Energy Services Inc. (GFES) on March 10 filed a brief in the U.S. Bankruptcy Court for the District of Delaware objecting to the company's plan to sell certain assets on grounds that the sale would not generate the $5,089,433.11 that the creditor contends it is guaranteed based on a lease agreement between the parties (In Re: Green Field Energy Services Inc., No. 13-12783, Chapter 11, D. Del. Bkcy.).