CO2 Enhanced Oil Recovery in Reservoirs with Advanced Wells; Simulations and Sensitivity Analysis

EasyChair Preprint 15421

Abstract

Injection of CO2 for enhanced oil recovery (CO2-EOR) is used in fields with high amount of residual oil. CO2-EOR refers to a technology where supercritical CO2 is injected into an oil reservoir to increase the oil production. CO2-EOR in combination with CO2-storage is an attractive method to increase the oil production from mature oilfields, and at the same time reduce the carbon footprint from industrial sources. Utilizing autonomous inflow control valves (AICVs) in CO2-EOR projects contributes to a better distribution of CO2 in the reservoir, reduction in production of water and CO2 mixture, and thereby increased storage capacity of CO2. The main objective of this study is modelling and simulation of oil production from an oil reservoir using CO2 water alternating gas (CO2 WAG) injection in combination with advanced wells that are completed with AICVs. Furthermore, performance evaluation of the AICV technology and sensitivity analysis of parameters affecting the WAG process are completed. The results from the simulations indicate that well completion with AICV can maintain good oil production while the production of water is decreased from 3e+06 m3 to 9.8e+04 m3 which corresponds to 97% reduction in water production. The sensitivity analysis of the simulation results affirms that permeability, well placement, and well spacing have impact on productivity in terms of both oil recovery and water production in the WAG EOR method. The results indicate that permeability increase has a slight increment effect on oil recovery. The well spacing analysis shows that increasing the distance between the wells will increase the oil recovery and delay the water breakthrough. Lastly the well placement analysis shows that vertical injection of miscible CO2 produces more oil than horizontal injection of miscible CO2. AICVs restrict the production of mixture of CO2 and water, and thereby cause a better distribution of CO2 in the reservoir.

Keyphrases: AICV, Autonomous Inflow Control Valve, CMG, Computer Modelling Group, Enhanced Oil Recovery, MMP, Minimum miscible pressure, Miscible CO2, Miscible CO2-EOR, WAG, Water alternating gas

@booklet{EasyChair:15421,
  author    = {Uchechukwu Agha Isu and Nora C.I. Furuvik and Soheila Taghavi},
  title     = {CO2 Enhanced Oil Recovery in Reservoirs with Advanced Wells; Simulations and Sensitivity Analysis},
  howpublished = {EasyChair Preprint 15421},
  year      = {EasyChair, 2024}}