Petroleum Reservoir Evaluation and Development ›› 2023, Vol. 13 ›› Issue (3): 296-304.doi: 10.13809/j.cnki.cn32-1825/te.2023.03.004

• Methodological Theory • Previous Articles     Next Articles

CO2 sequestration morphology and distribution characteristics based on NMR technology and microscopic numerical simulation

CHEN Xiulin1,2(),WANG Xiuyu1,2(),XU Changmin1,2,ZHANG Cong1,2   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China
    2. College of Petroleum Engineering, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2022-11-01 Online:2023-06-26 Published:2023-06-26


Under the situation of intensifying CO2 emissions and increasingly serious environmental problems, carbon emission reduction is urgent. CO2-EOR is the main means of geological storage of CO2, but most of the researches on CO2-EOR at home and abroad are to study the residual oil, and there are few studies on the form of CO2 storage during oil flooding. In this paper, nuclear magnetic resonance is used to detect CO2 displacement online combined with numerical simulation is used to study the CO2 storage morphology and distribution characteristics of different core saturated oil after gas flooding. The results show that the NMR technology combined with the microscopic gas flooding oil numerical simulation method can effectively study the microscopic storage morphology of CO2. When CO2 in the core replaces crude oil, it first enters the large pore to drive oil, and after the pressure in the large pore reaches a certain level, the crude oil flows to the small hole throat with uneven distribution of capillary force around it, and the gas continues to drive the crude oil until the small pore pressure accumulates to a certain value in the small pore. Numerical simulations are performed using COMSOL Multiphysics software. Microscopic simulation results shows that CO2 in large pores mainly exists in the form of continuous free gas, while CO2 in small pores is first retained in dissolved form. There is no CO2 completely stored in free gas or dissolved gas in both large and small pores.

Key words: CO2 flooding, unmiscible, CO2 micro-storage, NMR, numerical simulation

CLC Number: 

  • TE312