Pressure Buildup During Supercritical Carbon Dioxide Injection From a Partially Penetrating Borehole into Gas Reservoirs |
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Authors: | Sumit Mukhopadhyay Shao-Yang Yang Hund-Der Yeh |
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Institution: | (1) Department of Environment, Schwendistr. 12, 79102 Freiburg, Germany |
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Abstract: | Injecting CO2 into a subsurface formation causes a buildup of pressure in the vicinity of the injection well. While a large injection rate
can reduce the cost associated with injection, an indefinitely large injection rate can result in excessive formation damage.
To obtain an optimal injection rate without exceeding the safe pressure limits, one will like to have some knowledge of the
transient pressure buildup characteristics resulting from a particular injection rate. While elaborate numerical simulations
can provide reliable pressure buildup predictions, they require extensive knowledge about the formation, which is normally
not available at the start of an injection process. To alleviate this problem, using some simplifying assumptions, we have
developed a solution to predict the transient buildup of pressure resulting from injection of supercritical carbon dioxide
from a partially penetrating well into a gas reservoir. The solution in space and time is first obtained in the Fourier–Laplace
transform space, and then inverted back into real space (in cylindrical coordinates) and time. We use the solution to study
pressure transient characteristics for different formation permeabilities and anisotropy ratios. Results obtained using the
solution compared well with those from numerical simulations. |
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