The effect of CO2 sequestration on oll well cements

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Depleted oil- and gas-bearing formations represent likely locations for the disposal of CO2. Oil-and gas-bearing formations have proved capable of trapping fluids over geologic times. Because of the removal of hydrocarbons from these formations via wells, a potential avenue for leakage has been created. Cements are used in the construction (primary cement) and abandonment (plug cement) of oil and gas wells. Because wells represent a potential leakage pathway, it is important to study the effects of sequestration on the integrity of materials used to make them. Experiments are conducted to examine the effects of CO sequestration conditions on cements used to construct and abandon oil and gas wells. The experimental conditions consist of two influent pH 2.4 and 3.7, and two temperatures, 23° and 50°C, are considered likely for potential sequestration formations. The results show that significant damage, including complete loss of the calcium hydroxide phase, can take place over a time span as short as seven days. © 2005 Elsevier Ltd. All rights reserved. 2

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Greenhouse Gas Control Technologies

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