دورية أكاديمية
Experimental evaluation of cement integrity on exposure to supercritical CO2 using NMR: Application to geostorage
العنوان: | Experimental evaluation of cement integrity on exposure to supercritical CO2 using NMR: Application to geostorage |
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المؤلفون: | Sidi Mamoudou, Mark Curtis, Son Dang, Chandra Rai |
المصدر: | Heliyon, Vol 10, Iss 2, Pp e24144- (2024) |
بيانات النشر: | Elsevier, 2024. |
سنة النشر: | 2024 |
المجموعة: | LCC:Science (General) LCC:Social sciences (General) |
مصطلحات موضوعية: | Cement, Tortuosity, Carbon storage, Well integrity, Supercritical CO2, Carbonation, Science (General), Q1-390, Social sciences (General), H1-99 |
الوصف: | Carbon sequestration is one approach to achieve carbon dioxide reduction in the atmosphere. Underground storage of CO2 requires an understanding of geochemical and geomechanical alteration on the integrity of the injection wellbore. In this study, we investigate the reactivity of supercritical CO2 (scCO2) at 65 °C and 20.7 MPa on Portland class G cement plugs used for oil and gas well completion, for exposure of up to 5 weeks.For nanoporous media, such as cement, diffusion is believed to be the major mass transport mechanism (Perkins and Johnston, 1963) [1]. To quantify the extent of the alteration (mineralization/dissolution) on fluid diffusivity through the cement matrix, a novel approach based on Nuclear Magnetic Resonance (NMR) is employed to derive diffusional tortuosity. Comparing pre- and post-scCO2 exposure, deuterium oxide (D2O) intrusion profiles allow us to determine flow path alteration in the cement plugs. Additional characterizations include Fourier Transform Infrared Spectroscopy (FTIR) to observe the change in cement composition, micro X-ray Computed Tomography (μXCT), along with Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) to determine invasion extent and microstructure modifications, Mercury Injection Capillary Pressure (MICP) for pore throat size distribution and BET N2 isothermal adsorption for surface area and pore size distribution.The results show that exposure to scCO2 promotes both calcium carbonate precipitation and dissolution simultaneously. However, the alteration is pore size dependent. After 5 weeks of exposure, there is evidence of carbonate dissolution in smaller pores ( |
نوع الوثيقة: | article |
وصف الملف: | electronic resource |
اللغة: | English |
تدمد: | 2405-8440 |
Relation: | http://www.sciencedirect.com/science/article/pii/S2405844024001750; https://doaj.org/toc/2405-8440 |
DOI: | 10.1016/j.heliyon.2024.e24144 |
URL الوصول: | https://doaj.org/article/ed891594ab574bccb6302f104d5f216b |
رقم الأكسشن: | edsdoj.891594ab574bccb6302f104d5f216b |
قاعدة البيانات: | Directory of Open Access Journals |
تدمد: | 24058440 |
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DOI: | 10.1016/j.heliyon.2024.e24144 |