Progress in CO2 Storage and EOR Application Technologies in CNPC

Abstract

CO2 geological sequestration and Enhanced oil recovery (EOR) application is one of the possible way to manage the risk of global climate change. Since 2005, China National Petroleum Corporation (CNPC) has conducted pilot and extended test of CO2 flooding and storage in Songliao basin, from which significant progresses have been achieved in CO2 EOR technologies for low permeability reservoirs. Main progresses that we achieved include oil-CO2 phase behaviour studying and minimum miscible pressure (MMP) reduction technology, water alternating CO2 EOR method and recovery optimization stratagems. We also formed two types of separated layer CO2 injection technologies, bottom hole real time corrosion monitoring system, effective lift technologies for three different types of reservoirs based on gas-oil ratio classification, long distance pipeline transportation and supercritical CO2 injection technology, produced fluid treatment with CO2 EOR application and cycling gas injection technology, CO2 flooding reservoir monitoring, performance analysis and evaluation method, potential evaluation and strategic planning for CO2 EOR and storage in CNPC.