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Étude et modélisation de l'alteration physico-chimique de matériaux de cimentation des puits pétroliers

Abstract : Cement-based materials are used for a long time in oil and gas industry for cementing oil wells. The main role of the cement sheath is to permanently isolate all subsurface formations penetrated by the well. With the growing interest for the environmental concerns (limitation of hydrocarbon pollutants releases, CO2 geological storage), the long-term durability of the cement-based materials used for well construction has become of paramount importance. The principal aim of this present work is to better understand oil-wells cement behaviour during leaching under downhole conditions, and predict its long-term durability. An experimental setup allowed degradation of cement exposed to specific brine with a perfect control of different parameters (temperature, pressure, flowrate, composition). Three leaching tests were performed on cement pastes. The temperature and pressure conditions were as following: 80 °C – 1 bar, 80 °C – 70 bars and 80 °C – 200 bars. The results reported structural and chemical differences between the cement pastes observed after the two types of curing, leading to a different behaviour after leaching test. Moreover, the kinetics of degradation increases at highest pressures because of different solubility of minerals. Simulations were made with the reactive transport model HYTEC and reproduced the main experimental results obtained after cement paste leaching. Consequently, this present work allows news perspectives for researches on oilwell cement behaviour under elevated geological conditions.
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Submitted on : Monday, February 7, 2011 - 2:32:53 PM
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  • HAL Id : pastel-00563859, version 1

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Nadine Neuville. Étude et modélisation de l'alteration physico-chimique de matériaux de cimentation des puits pétroliers. Hydrologie. École Nationale Supérieure des Mines de Paris, 2008. Français. ⟨pastel-00563859⟩

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