大庆油田：打通非混相驱CCUS全产业链

Core Insights - The successful operation of the CO2 capture, utilization, and storage (CCUS) system at Daqing Oilfield's Aonan Oilfield marks the establishment of China's first million-ton non-miscible drive CCUS full industry chain demonstration base, filling a technological gap in the field [1][2] - The CCUS-EOR technology is viewed as a key solution for the oil and petrochemical industry to address the dual challenges of carbon neutrality and maintaining production efficiency in aging oil fields [2][3] Group 1 - The Aonan Oilfield, characterized by low permeability, faces challenges such as declining production and high water content after nearly 30 years of development, prompting the implementation of non-miscible drive CCUS technology [2][3] - The project has adopted a comprehensive approach involving optimization of layout, systems, and solutions, utilizing five technologies and three measures to establish a million-ton non-miscible drive CCUS technology system [2][3] Group 2 - The project aims to achieve effective CO2 displacement at a million-ton scale, which presents unprecedented challenges in parameters design, process control, and dynamic monitoring [3] - Innovative two-stage separation processes have been designed to address high gas content in produced fluids, ensuring stable pressure and smooth operation of the oil processing system [3][4] Group 3 - The project has implemented a strategy of alternating water and gas injection, which has effectively reduced gas production and increased oil output to 1.4 times the level before gas injection [4] - A digital monitoring platform has been established to ensure continuous high-quality operation of the oil wells, with a full-process control system in place [4] Group 4 - As of now, the CCUS project has injected 81,400 tons of liquid CO2, with an expected annual storage capacity exceeding one million tons, significantly improving oil recovery rates in the Aonan target area [4] - The project also provides a carbon capture outlet for Daqing Petrochemical's 400,000-ton carbon capture project, effectively integrating the entire industry chain from capture to storage [4]