Hydro-Mechanical-Chemical Modelling of CO2 storage in a North Sea hydrocarbon chalk reservoir

6 Pages Posted: 22 Nov 2022

Date Written: November 13, 2022


This paper describes the effect of CO2 injection into one of the depleted North Sea hydrocarbon chalk reservoirs considering coupled Hydro-Mechanical-Chemical processes. Literature data suggest that supercritical CO2 may alter chalk's geomechanical properties, such as yield stress and bulk modulus, making it necessary to assess the hydro-mechanical-chemical response of the near wellbore and reservoir intervals, caprock, and more importantly, potential issues with well integrity. By considering different physics and reservoir properties, here we evaluate the ultimate CO2 storage capacity for highly deformable chalk. To that aim, a wrapper is developed in Ocean Petrel that utilizes the Eclipse reservoir and Visage geomechanics simulators to capture the induced alteration of the mechanical and petrophysical properties of chalk caused by supercritical CO2. The Hydro-Mechanical-Chemical model is built using a detailed history-matched reservoir model based on more than 20 years of hydrocarbon production data to estimate the CO2 storage capacity of the depleted Harald East chalk field in the Danish North Sea. The results reveal that changing the geomechanical properties by CO2 injection causes pore volume and permeability change around the injection well, which influences CO2 injectivity.

Keywords: : CO2 Capacity; Compositional, Reservoir simulation, Geomechanics, Chalk weakening, Depleted gas reservoirs,

Suggested Citation

Hosseinzadehsadati, Seyedbehzad and Amour, Frédéric and Hajiabadi, Mohammad Reza and M. Nick, Hamidreza, Hydro-Mechanical-Chemical Modelling of CO2 storage in a North Sea hydrocarbon chalk reservoir (November 13, 2022). Proceedings of the 16th Greenhouse Gas Control Technologies Conference (GHGT-16) 23-24 Oct 2022, Available at SSRN: https://ssrn.com/abstract=4275914 or http://dx.doi.org/10.2139/ssrn.4275914

Seyedbehzad Hosseinzadehsadati (Contact Author)

DTU Offshore ( email )

Elektrovej 375
Lyngby 2800

Frédéric Amour

Technical University of Denmark ( email )

Anker Engelunds Vej 1
Building 101A
Lyngby, 2800

Mohammad Reza Hajiabadi

Technical University of Denmark

Hamidreza M. Nick

DTU Offshore ( email )

Elektrovej 375
Lyngby 2800

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