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Characteristics of Salt-Precipitation and the Associated Pressure Build-Up during CO2 Storage in Saline Aquifers

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Abstract

Mitigation and control of borehole pressure at the bottom of an injection well is directly related to the effective management of well injectivity during geologic carbon sequestration activity. Researchers have generally accepted the idea that high rates of CO2 injection into low permeability strata results in increased bottom-hole pressure in a well. However, the results of this study suggested that this is not always the case, due to the occurrence of localized salt precipitation adjacent to the injection well. A series of numerical simulations indicated that in some cases, a low rate of CO2 injection into high permeability formation induced greater pressure build-up. This occurred because of the different types of salt precipitation pattern controlled by buoyancy-driven CO2 plume migration. The first type is non-localized salt precipitation, which is characterized by uniform salt precipitation within the dry-out zone. The second type, localized salt precipitation, is characterized by an abnormally high level of salt precipitation at the dry-out front. This localized salt precipitation acts as a barrier that hampers the propagation of both CO2 and pressure to the far field as well as counter-flowing brine migration toward the injection well. These dynamic processes caused a drastic pressure build-up in the well, which decreased injectivity. By modeling a series of test cases, it was found that low-rate CO2 injection into high permeability formation was likely to cause localized salt precipitation. Sensitivity studies revealed that brine salinity linearly affected the level of salt precipitation, and that vertical permeability enhanced the buoyancy effect which increased the growth of the salt barrier. The porosity also affected both the level of localized salt precipitation and dry-out zone extension depending on injection rates. High temperature injected CO2 promoted the vertical movement of the CO2 plume, which accelerated localized salt precipitation, but at the same time caused a decrease in the density of the injected CO2. The combination of these two effects eventually decreased bottomhole pressure. Considering the injectivity degradation, a method is proposed for decreasing the pressure build-up and increasing injectivity by assigning a ‘skin zone’ that represents a local region with a transmissivity different from that of the surrounding aquifer.

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Authors and Affiliations

  1. Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea

    Kue-Young Kim, Junho Oh, Taehee Kim & Jeong-Chan Kim

  2. Department of Geosciences, University of Wisconsin-Milwaukee, Milwaukee, WI, USA

    Weon Shik Han

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  1. Kue-Young Kim
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  2. Weon Shik Han
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  3. Junho Oh
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  4. Taehee Kim
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Correspondence to Weon Shik Han.

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Kim, KY., Han, W.S., Oh, J. et al. Characteristics of Salt-Precipitation and the Associated Pressure Build-Up during CO2 Storage in Saline Aquifers. Transp Porous Med 92, 397–418 (2012). https://doi.org/10.1007/s11242-011-9909-4

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