PetroChina's Sichuan project would be among the largest investments of its kind in Asia.
Saudi Arabian Oil Co, Exxon Mobil Corp. and China Petroleum & Chemical Corp. have agreed to triple the output at a refinery in southeast China and build new chemical plants.
Reliance Petroleum Ltd is spending $6.1 billion on building a 580,000 barrel-a-day plant next to its 660,000 barrel-a-day facility at Jamnagar in Gujarat state, making it the world's largest refining complex on one site.