Pyatina, T.; Sugama, T.; Moghadam, A.; Naumann, M.; Skorpa, R.; Feneuil, B.; Soustelle, V.; Godøy, R. Assessment of Cementitious Composites for High-Temperature Geothermal Wells. Materials2024, 17, 1320.
Pyatina, T.; Sugama, T.; Moghadam, A.; Naumann, M.; Skorpa, R.; Feneuil, B.; Soustelle, V.; Godøy, R. Assessment of Cementitious Composites for High-Temperature Geothermal Wells. Materials 2024, 17, 1320.
Pyatina, T.; Sugama, T.; Moghadam, A.; Naumann, M.; Skorpa, R.; Feneuil, B.; Soustelle, V.; Godøy, R. Assessment of Cementitious Composites for High-Temperature Geothermal Wells. Materials2024, 17, 1320.
Pyatina, T.; Sugama, T.; Moghadam, A.; Naumann, M.; Skorpa, R.; Feneuil, B.; Soustelle, V.; Godøy, R. Assessment of Cementitious Composites for High-Temperature Geothermal Wells. Materials 2024, 17, 1320.
Abstract
High temperature (HT) geothermal wells can provide green power 24h a day 7 days a week. Harsh environmental and operational conditions, long-term durability requirements of such wells require special cementitious composites for well construction. This paper reports a comprehensive assessment of geothermal cement composites in cyclic pressure function laboratory tests, field exposures in an HT geothermal well (300-350oC) as well as a numerical model to complement the experimental results. Performances of calcium-aluminate-cement (CAC)-based composites and calcium free cement were compared against reference Ordinary Portland Cement (OPC)/silica blend. The stability and degradation of the tested materials was characterized by crystalline composition, thermo-gravimetric, and elemental analyses, morphological studies, water-fillable porosity, and mechanical properties measurements. All CAC-based formulations outperformed the reference blend both in the function and exposure tests. The reference OPC/silica lost its mechanical properties during the 9-month well exposure through extensive HT carbonation, while properties of the CAC-based blends improved over that period. The Modified Cam-Clay (MCC) plasticity parameters of several HT cement formulations were extracted from triaxial and Brazilian tests and verified against the experimental results of function cyclic tests. These parameters can be used in well integrity models to predict field-scale behavior of the cement sheath under geothermal well conditions.
Keywords
high temperature cementitious materials, cement well exposure tests, calcium-aluminate well cement, function cement tests, well cement CO2 resistance, finite element modeling of well cement, calcium-free well cement.
Subject
Chemistry and Materials Science, Ceramics and Composites
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
