A new cement slurry modified with chitosan/alginate interpenetrating networks and hydroxyapatite - structural characteristics after long-term contact with hyper-saline produced water from oil well operations
| Autor: | Joenesson Fílip Santos Ribeiro, José do Patrocínio Hora Alves, Ivory Marcos Gomes dos Santos, Angélica Baganha Ferreira, Danilo Oliveira Santos, Antonio R. Cestari |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
0211 other engineering and technologies General Physics and Astronomy biopolymers 02 engineering and technology engineering.material Portlandite Chitosan chemistry.chemical_compound 021105 building & construction General Materials Science Thermal stability Composite material Cement hydroxyapatite General Chemistry 021001 nanoscience & nanotechnology Saline water Produced water Cement slurries chemistry Chemical engineering engineering Slurry Biopolymer 0210 nano-technology |
| Zdroj: | Matéria (Rio de Janeiro) v.22 n.1 2017 Matéria (Rio de Janeiro. Online) instacron:RLAM Matéria (Rio de Janeiro), Volume: 22, Issue: 1, Article number: e11779, Published: 10 APR 2017 |
| Popis: | Oil is an important source of energy, mainly in developing countries. Important research has been conducted to find cementing procedures that guarantee safe and cost-effective oil exploration below pre-salt layers. This work aimed to make a new cement paste with cement, seawater, silica, biopolymers (chitosan and sodium alginate) and hydroxyapatite (HA), found in nature. For comparison purposes, slurry without additives was prepared and characterized. The HA used was extracted from fish scales (Cynoscion acoupa) in optimized condition NaOH concentration, temperature and reaction time. Both slurry were prepared with ratios water/cement (w/c) and silica/cement (s/c) equal to 0.50 and 0.35, respectively. The new cement slurry was obtained with proportions of 5% of each biopolymer and HA with respect to the total weight of the cement. In the immersion tests, specimens were immersed in samples of hyper production of saline water by 35°C for 15 days. Thereafter, they were washed, dried and its surface layers were scraped. Before, the resulting materials were characterized. The values of the ratios Ca/Si of new cement slurry (3.38 ± 0.06) were superior compared to standard (2.58 ± 0.05). The new slurry had high thermal stability and low amounts of small crystallite-type portlandite (35.70 nm). Conversely, a slurry standard formed larger crystals of about 50.3 nm. Significantly, after continuous long-term contact of both slurries with hyper-saline produced water from oil well fields operations, in comparison with standard slurry structural characteristics, the new slurry has practically maintained its pristine chemical structure, as well as has shown crystallite-type particles of NaCl and Friedel's/Kuzel's salts with lower proportion. The presence of the biopolymers and HA has driven the improved the self-healing properties observed in the new cement slurry. In this first study, the new slurry has shown adequate characteristics to contribute to cost effective and environmental-friendly oil well operations. |
| Databáze: | OpenAIRE |
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