ABUJA — NNPC Ltd, Shell's SNEPCo, Esso and Nigerian Agip have signed amendments to the production sharing contract for OML 118 to advance the Bonga South-West/Aparo deepwater project. NNPC said the project could attract $15 billion to $21 billion of investment and produce about 175,000 barrels of oil and 140 million cubic feet of gas per day at peak. Front-end engineering design is the next stage.