Advanced Technologies Application - A Full Subsurface to Surface Integrated Approach to Meet the Challenges of a Complex Multi Reservoir Carbonate Field CO2 EOR Development

Abstract

Miscible CO2 flood - similar to miscible hydrocarbon gas injection - is a well-established proven EOR development scheme. There have been a large number of CO2 EOR developments worldwide, with deployment in both carbonate and clastic reservoirs. Potential controlling factors on CO2 EOR incremental production and recovery are well understood and widely published. This paper presents an integrated CO2 EOR development study, with emphasis on advanced technologies application - a full subsurface to surface integrated approach to meet the challenges of a complex multi reservoir carbonate field CO2 EOR development. This paper is a follow up companion paper, presenting additional results, to a previous paper by Xu S. et al (2021). Holistic detailed studies were performed expediting advanced technologies deployment under a CCUS Hub decarbonisation approach. Based on field pilot testing results, multi advanced technologies from subsurface to surface were assessed in a fully integrated manner. These include Maximum Reservoir Contact (MRC) wells, Limited Entry Liner (LEL) and fishbone drilling advanced completion technologies, fishbone surface networking, CO2 recovery unit etc. Significant improvements in incremental oil recovery and project economics were obtained.