July 15 (Reuters) - The Federal Trade Commission denied

a request by Scott Sheffield, the founder and former CEO of

Pioneer Natural Resources, to reopen and set aside a final

consent order involving ExxonMobil's ( XOM ) acquisition of

Pioneer, the commission said on Tuesday.

The commission ruled to deny Sheffield's petition because he

is not a party to the final order and therefore cannot make use

of the petition process, the FTC said in a statement.