CO2 Leak Rate Estimation for a CCS well in a Depleted Field in the North Sea
conference paper
Carbon capture and storage (CCS) technology aims to store CO2 permanently in the subsurface to reduce the emissions to the atmosphere. Long term containment of the CO2 is of critical importance for a successful CCS project. Leakage along wells can occur inside and outside of the casing for both the injector and legacy wells. However, the leakage rate in wells is difficult to measure and predict. The magnitude of well leakage is an important consideration for quantitative risk assessment of CCS projects. In addition, regulations and lack of understanding of leakage magnitude can cap the maximum injection pressure in the storage complex which has an adverse effect on the storage capacity and the revenue of the project. In this work, we developed a case study based on a synthetic well in the Dutch North Sea. We assess the integrity of the cement during the operational history of the well using a staged
finite element method considering the cement hydration process. The presence of the microannuli and the subsequent leakage of CO2 across the caprock is then calculated. The results provide better understanding of the magnitude of leakage and its dependence on maximum pressure and other flow and formation properties.
finite element method considering the cement hydration process. The presence of the microannuli and the subsequent leakage of CO2 across the caprock is then calculated. The results provide better understanding of the magnitude of leakage and its dependence on maximum pressure and other flow and formation properties.
Topics
TNO Identifier
1006463
Source title
5th Global Energy Transition Conference and Exhibition
Pages
1-5
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