Modeling and Simulation of Gas Injection Processes
Dr. Kristian Jessen, USC
In order to estimate the potential incremental hydrocarbon recovery by CO2 injection, compositional reservoir simulators are commonly used in the industry. Successful design and implementation of CO2 injection processes rely, in part, on the accuracy by which the available simulation tools can represent the physics that govern the displacement behavior in a reservoir. In this work, we investigate the accuracy of some physical models that are frequently used to describe mixing and mass transfer in compositional reservoir simulation.
Inspired by laboratory observations, we discuss a new upscaling strategy for compositional simulation at larger scale, where a high-resolution reservoir model is transformed into a coarse dual-porosity and dual-permeability model. We introduce a streamline index to partition passive and active porosities and demonstrate that the proposed method is significantly less sensitive to coarsening than traditional single-porosity upscaling techniques.
To extend the application of our proposed workflow beyond conventional reservoirs, we demonstrate the need for better models in the context of naturally fractured reservoirs where mass transfer between fractures and matrix blocks dictates the performance of enhanced recovery processes.
Kristian Jessen is Associate Professor in the Mork Family Department of Chemical Engineering and Materials Science at University of Southern California. He holds BSc, MSc and PhD degrees in Chemical Engineering from the Technical University of Denmark.
Dr. Jessen is the co-founder of the consulting company Tie-Line technology ApS that specializes in PVT software for design and optimization of gas injection processes. He has authored and co-authored numerous technical papers in the area of modeling and simulation of enhanced oil/gas recovery by gas injection processes.
His current research activities include characterization and modeling of mass transfer and sorption phenomena in the context of unconventional oil and gas resources, and CO2 storage in subsurface formations.