Study of oilwell cements by solid-state NMR

• Published in: Comptes rendus. Chimie Vol. 7; no. 3-4; pp. 383 - 388
• Main Authors: LE SAOUT, Gwenn, LECOLIER, Eric, RIVEREAU, Alain, ZANNI, Hélène
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Paris Elsevier 01.03.2004; Académie des sciences (Paris)
• Subjects: Applied sciences; Chemical Sciences; Crude oil, natural gas and petroleum products; Energy; Exact sciences and technology; Fuels; Material chemistry; Storage of liquid petroleum products and other liquids. Tanks. Metering. Underground storage. Problems of losses in storage; Measurement; Cement; Plugging; Weathering; Nuclear magnetic resonance; X ray diffractometry; Oil well; NMR; RMN; XRD; DRX; Ciments pétroliers; Oilwell cements
• ISSN: 1631-0748; 1878-1543; 1878-1543
• DOI: 10.1016/j.crci.2003.10.018

The prime objective of the plug-and-abandon operations is to provide zonal isolation for infinite time. Cement-based materials are generally used as plugging materials. Therefore, it is important to understand physical and chemical processes causing cement degradation in downhole environment. In this study, we have characterised two cement formulations at different ageing conditions using NMR and XRD techniques. In particular, we evidence that an increase in pressure and temperature leads to more polymerised calcium silicate hydrates (C-S-H). In the low permeability cement samples, it was shown that the pozzolanic activity of silica fumes increases with temperature and pressure and leads to the consummation of all the portlandite released during cement hydration.