Shell has agreed to sell its Nigerian onshore oil and gas subsidiary in Nigeria to Renaissance, a consortium of five companies, for up to $2.4-billion, the British company said on Tuesday. Shell will sell The Shell Petroleum Development Company of Nigeria Limited (SPDC) for a consideration of $1.3-billion, it said in a statement, while the buyers will make an additional payment of up to $1.1-billion relating to prior receivables at completion.