Numerical Study on the Impact of Reservoir Heterogeneity on Utilization of CO2 and Optimization Strategies in Low-Permeability Reservoirs

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• Publisher: Cuvillier Verlag
• Year: 2024
• eBook ISBN:
  9783736969889
• Print ISBN:
  9783736979888
• Edition: 1

The intensification of the global climate crisis has thrust the imperative of controlling greenhouse gas emissions into the spotlight, commanding the attention of individuals, industries, and nations alike. Reducing carbon emissions and maximizing carbon utilization have assumed paramount significance in the contemporary industrial landscape. Within this overarching context, Carbon Capture, Utilization, and Storage (CCUS) technology has emerged as a transformative and pivotal means of addressing the multifaceted challenges posed by escalating emissions.Among the diverse CCUS methodologies, enhanced oil recovery (EOR) has distinguished itself as an up-and-coming technique, offering economic viability and environmental impact. Simultaneously, enhanced gas recovery (EGR) has recently gained momentum due to its remarkable potential as a negative carbon technology.This study employs an integrated approach to gain a deeper and more precise understanding of how reservoir heterogeneity influences the geological utilization of CO2.It commences with the utilization of FLAC3D and the "gast" tool in R language to generate comprehensive data fields that quantitatively characterize heterogeneity in terms of porosity standard deviation and correlation length. Subsequently, the research conducts a comprehensive and methodical analysis of how heterogeneity impacts CO2 gas displacement.

Table of contents

• 1. Introduction
• 1.1 Properties of CO2
• 1.2 Types of geological utilization of CO2
• 1.3 Progress of CO2 geological utilization
• 1.3 Progress of CO2 geological utilization
• 1.4 Characteristics and challenges of unconventional oil reservoirs
• 1.5 Thesis outline
• 2. Simulation concept and method
• 2.1 Simulation approach
• 2.2 Mathematical model and governing equations
• 2.3 Numerical model validation
• 3. Effect of reservoir heterogeneity on CO2 flooding in lowpermeabilitygas reservoir
• 3.1 Model generation
• 4. Effect of reservoir heterogeneity on CO2 flooding in lowpermeabilityoil reservoirs
• 4.1 Model generation
• 5. Research on improving development effect
• 5.1 Effect of CO2 foam injection
• 5.2 CO2-Alternating-N2 (CAN) injection
• 5.3 CO2 altering water (CAW) injection
• 5.4 Effect of CO2 injection rate and production pressure
• 5.5 Development effect comparison
• 6. Upscaling reservoir simulation
• 6.1 Reservoir overview
• 7. Conclusions and Outlook
• 8. Reference