Simulation of immiscible water-alternating-CO2 flooding in the Liuhua Oilfield Offshore Guangdong, China

Gang Hu, Pengchun Li, Linzi Yi, Zhongxian Zhao, Xuanhua Tian, Xi Liang

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, the immiscible water-alternating-CO2 flooding process at the LH11-1 oilfield, offshore Guangdong Province, was firstly evaluated using full-field reservoir simulation models. Based on a 3D geological model and oil production history, 16 scenarios of water-alternating-CO2 injection operations with different water alternating gas (WAG) ratios and slug sizes, as well as continuous CO2 injection (Con-CO2) and primary depletion production (No-CO2) scenarios, have been simulated spanning 20 years. The results represent a significant improvement in oil recovery by CO2 WAG over both Con-CO2 and No-CO2 scenarios. The WAG ratio and slug size of water affect the efficiency of oil recovery and CO2 injection. The optimum operations are those with WAG ratios lower than 1:2, which have the higher ultimate oil recovery factor of 24%. Although WAG reduced the CO2 injection volume, the CO2 storage efficiency is still high, more than 84% of the injected CO2 was sequestered in the reservoir. Results indicate that the immiscible water-alternating-CO2 processes can be optimized to improve significantly the performance of pressure maintenance and oil recovery in offshore reef heavy-oil reservoirs significantly. The simulation results suggest that the LH11-1 field is a good candidate site for immiscible CO2 enhanced oil recovery and storage for the Guangdong carbon capture, utilization and storage (GDCCUS) project.
Original languageEnglish
JournalEnergies
Volume13
Issue number9
Early online date28 Apr 2020
DOIs
Publication statusE-pub ahead of print - 28 Apr 2020

Keywords

  • immiscible flooding
  • CO2 storage
  • water-alternating-CO2
  • heavy crude oil
  • reef reservoir
  • offshore Guangdong province

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