Abstract
The injection of CO2 into a depleted hydrocarbon field or aquifer involves a complex interplay of various coupled physical and chemical processes. In chalk reservoirs, the complexities of the CO2 injection process are amplified due to the highly deformable nature of chalk. Consequently, the necessity of thermo-hydro-mechanical modeling for CO2 arises, which is essential for a comprehensive understanding and quantification of the development of potentially hazardous leakage pathways. These pathways are linked to phenomena such as fracturing and fault reactivation, ultimately leading to the enhancement of effective permeability in both the caprock and reservoir.
Our study investigates the pressure and temperature changes responsible for effective stress variation during a 16-year CO2 injection in the Harald East field, a depleted gas reservoir located in the Danish North Sea. The Harald East chalk field has produced much of its initial gas in place, resulting in a significant reduction in average reservoir pressure. To identify stress, pressure, and temperature alterations along the injection well, this study considers the entire storage area, encompassing the reservoir, caprocks, overburden, and sideburdens, including spill points.
Using the "two-way" coupling of flow and stress models model, numerical simulations were conducted to predict induced deformations and in situ stress variations resulting from gas production and a CO2 injection scenario aimed at storing CO2 for the long term, which were then history-matched with the production period and platform subsidence.
Our study investigates the pressure and temperature changes responsible for effective stress variation during a 16-year CO2 injection in the Harald East field, a depleted gas reservoir located in the Danish North Sea. The Harald East chalk field has produced much of its initial gas in place, resulting in a significant reduction in average reservoir pressure. To identify stress, pressure, and temperature alterations along the injection well, this study considers the entire storage area, encompassing the reservoir, caprocks, overburden, and sideburdens, including spill points.
Using the "two-way" coupling of flow and stress models model, numerical simulations were conducted to predict induced deformations and in situ stress variations resulting from gas production and a CO2 injection scenario aimed at storing CO2 for the long term, which were then history-matched with the production period and platform subsidence.
Original language | English |
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Publication date | 2024 |
Number of pages | 7 |
Publication status | Published - 2024 |
Event | GeoMontréal 2024 - Hotel Bonaventure, Montréal, Canada Duration: 15 Sept 2024 → 18 Sept 2024 |
Conference
Conference | GeoMontréal 2024 |
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Location | Hotel Bonaventure |
Country/Territory | Canada |
City | Montréal |
Period | 15/09/2024 → 18/09/2024 |