Impact of co-injected impurities on hydrodynamics of CO2 injection. Studying interplayed chromatographic partitioning and density driven flow and fate of the injected mixed gases: numerical and experimental results. - Mines Paris Accéder directement au contenu
Communication Dans Un Congrès Année : 2018

Impact of co-injected impurities on hydrodynamics of CO2 injection. Studying interplayed chromatographic partitioning and density driven flow and fate of the injected mixed gases: numerical and experimental results.

Irina Sin
Jérôme Corvisier

Résumé

This work presented a study on the chromatographic partitioning of CO2 and impurities present in the injected stream in the CCS context. Laboratory and field observations have already revealed the chromatographic partitioning phenomenon of CO2 and impurities both in the gas and in the aqueous phases. Series of laboratory experiments are modeled using the reactive transport HYTEC. Numerical results confirm the laboratory observations and show differential breakthrough of injected gases. A series of experiments on CO2 and H2S mixture with different H2S concentration is modeled. Numerical results of HYTEC are successfully compared with the results given by CMG-GEM and with experimental data. Another series of dynamic displacement-solubility experiments is modeled to study the chromatographic gas partitioning depending on a type of impurity such as H2S, CH4, N2, SO2. O2, and Ar. Numerical results show that the physics can be modeled both qualitatively and quantitatively. 1. Solubility of the impurity in the injected stream regarding to that of CO2 is a key factor. The less soluble the impurity gas is, the earlier and higher breakthrough should be expected. 2. Classification of impurity gases can be proposed. For example, in the decreasing order of their solubility (13.5 MPa, 61°C, 118950 ppm): SO2 > H2S > CO2 > CH4 > Ar > O2 > N2. 3. Using accurate models of reactive transport, solubility, phase equilibrium and thermodynamic properties of non-ideal mixtures allows reproducing of the chromatographic partitioning: breakthrough time of gases, gas concentration, and front propagation. Chromatographic partitioning was studied at reservoir scale by modeling two scenarios of impure CO2 injection over 30 years: 95%CO2+4%N2+1%O2 and 95%CO2+5%SO2. When injecting impurities, the chromatographic partitioning can be observed inside the gas plume and in the aqueous solution. Modeling injection of 95%CO2+4%N2+1%O2 demonstrated potential usage of noble gases for monitoring and proved the previous laboratory results. The plume composition strongly depends on a type of the co-injected gas. Moreover, a type of impurity and its concentration change the density of gas current and the density of the formation water with dissolved components. Both densities in the case of 95%CO2+5%SO2 injection are overall higher than those in the 95%CO2+4%N2+1%O2 model. This impacts on the buoyancy forces, hence on the distance, velocity and shape of the plume. Since dissolved impurities contribute to the liquid density, it can then accelerate or slow convective dissolution. Heterogeneous gas composition induces density driven motion that can be especially important in case of heavy compounds such as SO2.
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Dates et versions

hal-02341907 , version 1 (31-10-2019)

Identifiants

  • HAL Id : hal-02341907 , version 1

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Irina Sin, Jérôme Corvisier. Impact of co-injected impurities on hydrodynamics of CO2 injection. Studying interplayed chromatographic partitioning and density driven flow and fate of the injected mixed gases: numerical and experimental results.. 14th Greenhouse Gas Control Technologies Conference 21-26 October 2018 (GHGT-14), Oct 2018, Melbourne, Australia. ⟨hal-02341907⟩
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