Oilwell cements: NMR contribution to establish the phase diagram pressure/temperature of the mixture H2O / Ca3SiO5 |
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| Institution: | 1. Laboratoire de physique et mécanique des milieux hétérogènes, UMR CNRS 7636, École supérieure de physique et chimie industrielles, 10, rue Vauquelin, 75231 Paris cedex 05, France;2. Institut français du pétrole, BP 311, 1 et 4, av. de Bois-Préau, 92506 Rueil-Malmaison cedex, France;1. Jiangsu Provincial Key Lab for Interventional Medical Device, Huaiyin Institute of Technology, Huaian 223003, Jiangsu Province, China;2. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;1. Constantine the Philosopher University, 949 74 Nitra, Slovakia;2. Research Institute of Animal Production, 951 41 Lužianky, Slovakia;3. Faculty Hospital Nitra, 949 01 Nitra, Slovakia;4. King Saud University, Department of Zoology, College of Science, Riyadh 11451, Saudi Arabia;5. Institute of Animal Reproduction and Food Research, 10-748 Olsztyn, Poland;1. Constantine the Philosopher University, 949 74 Nitra, Slovak Republic;2. Research Institute for Animal Production in Nitra, 951 41 Lužianky, Slovak Republic;3. Institute of Animal Reproduction and Food Research, 10-718 Olsztyn-Kortowo, Poland;4. King Saud University, P. O. Box 2455, 11451 Riyadh, Saudi Arabia |
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| Abstract: | Cement slurry is always used to support the casing of oilwells. This slurry is pumped down the steel casing of the well and then placed in the annular space between the casing and the surrounding rock. Nowadays wells are becoming deeper and deeper so the setting conditions of the cement paste are crucial. The pressure and temperature limit conditions can reach 1 000 bar and 250 °C at the bottom of the well. Hydration of synthetic tricalcium silicate Ca3SiO5 – the main component of oil well cements – was performed at high temperature under high pressure to simulate the oilwell conditions. The objective of the study is the establishment of the phase diagram of the ternary system – SiO2, CaO, H2O – according to the parameters: pressure, temperature and Ca/Si ratio. In this study, NMR is largely used to identify and to quantify the synthesized silicate hydrates, with two setting conditions (6 days at 120 °C under 400 bar and 6 days at 200 °C under 600 bar). Mechanical tests were performed to evaluate the compression strength of those silicate hydrates synthesized under such drastic conditions and to verify that they were still efficient binders. |
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