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- W4313134837 abstract "ABSTRACT: This work presents a well integrity tool based on an analytical model describing the thermo-poroelastic behaviour of wells in the so-called drained conditions and plane-strain conditions. The analytical model takes into account the pore pressure, uniform temperatures changes across the well and the cement’s initial state of stress. The well integrity tool estimates the potential for debonding, tensile and shear fracturing of the rock and the cement sheath using computed stress profiles and the Mohr-Coulomb failure criterion. The tool is suited to study vertical well sections consisting of a single casing and cement sheath inside a porous or non-porous rock formation. The tool is built within a Microsoft Excel spreadsheet to make it as accessible, portable and flexible as possible. Furthermore, this work also presents an integrity analysis of a characteristic gas production well re-purposed for CO2 injection. This investigation covers the construction of the well, reservoir depletion, CO2 injection and long-term storage conditions. This demonstrates the type of data necessary for the tool to function, the different results and outputs that may be expected and the type of conclusions that may be drawn from them. This work is part of wider efforts by TotalEnergies to drive the development of safe CO2 storage technology and in particular to progress the understanding of well integrity loss mechanisms. 1 INTRODUCTION Storing CO2 in depleted oil & gas fields (DOGF) can help meet climate targets by enabling faster and cheaper deployment of geological carbon storage projects in comparison to saline aquifer storage. Indeed, in the case of DOGF large investments have already been made and can be capitalised on. This includes data acquisitions campaigns, reservoir characterisation studies, and construction of exploration, production and monitoring wells. According to the International Energy Agency’s Greenhouse Gas R&D Programme and the Zero Emissions Platform IEAGHG and ZEP (2011), the total costs associated with CO2 storage could be cut by half when using depleted reservoirs instead of saline aquifers. Furthermore, if the existing legacy wells which are already present in depleted reservoirs can be repurposed for the injection of CO2, additional cost-reductions could be achieved and the deployment of carbon storage projects accelerated." @default.
- W4313134837 created "2023-01-06" @default.
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- W4313134837 date "2022-06-26" @default.
- W4313134837 modified "2023-10-03" @default.
- W4313134837 title "An Open-Access Well Integrity Tool to Study Legacy Wells Re-Purposed for CO2 Injection" @default.
- W4313134837 doi "https://doi.org/10.56952/arma-2022-0980" @default.
- W4313134837 hasPublicationYear "2022" @default.
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