The study on density change of carbon dioxide seawater solution at high pressure and low temperature

Song, Yongchen; Chen, Baixin; Nishio, Makoto; Akai, Makoto

doi:10.1016/j.energy.2003.10.022

Cited by 49 publications

(46 citation statements)

References 9 publications

(15 reference statements)

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“…Pore fluid that becomes saturated in CO 2 (aq) will sink because it is denser than both the CO 2 (l) and the pristine pore fluid (19). We expect the sinking of the saturated pore fluid to entrain additional pore fluid from outside the CO 2 (l) plume and accelerate the dissolution of CO 2 (l) and CO 2 hydrates.…”

Section: Discussionmentioning

confidence: 99%

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Permanent carbon dioxide storage in deep-sea sediments

House

Schrag

Harvey

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

363

228

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Stabilizing the concentration of atmospheric CO 2 may require storing enormous quantities of captured anthropogenic CO 2 in near-permanent geologic reservoirs. Because of the subsurface temperature profile of terrestrial storage sites, CO 2 stored in these reservoirs is buoyant. As a result, a portion of the injected CO 2 can escape if the reservoir is not appropriately sealed. We show that injecting CO 2 into deep-sea sediments <3,000-m water depth and a few hundred meters of sediment provides permanent geologic storage even with large geomechanical perturbations. At the high pressures and low temperatures common in deep-sea sediments, CO 2 resides in its liquid phase and can be denser than the overlying pore fluid, causing the injected CO 2 to be gravitationally stable. Additionally, CO 2 hydrate formation will impede the flow of CO 2 (l) and serve as a second cap on the system. The evolution of the CO 2 plume is described qualitatively from the injection to the formation of CO 2 hydrates and finally to the dilution of the CO 2 (aq) solution by diffusion. If calcareous sediments are chosen, then the dissolution of carbonate host rock by the CO 2 (aq) solution will slightly increase porosity, which may cause large increases in permeability. Karst formation, however, is unlikely because total dissolution is limited to only a few percent of the rock volume. The total CO 2 storage capacity within the 200-mile economic zone of the U.S. coastline is enormous, capable of storing thousands of years of current U.S. CO 2 emissions.

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Section: Discussionmentioning

confidence: 99%

“…CO 2 that has been injected into deep-sea sediments will slowly dissolve, forming a CO 2 (aq) solution that is denser than the surrounding pore fluid (19). At 30 MPa and 3°C, the solution becomes saturated at a CO 2 (aq) mole fraction of Ϸ5% (20).…”

Section: Postinjection Chemistry and Sediment Compositionmentioning

confidence: 99%

Permanent carbon dioxide storage in deep-sea sediments

House

Schrag

Harvey

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

363

228

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“…(10) to be simple: (11) where ρ m and ρ 1 m are the mass density of the solution and brine, respectively; ρ 2 m, φ is the apparent mass density of CO 2 which can be obtained by Eq. (12). (12) The apparent molar volume of CO 2 in water V 2 φ was represented as a function of temperature in Garcia et al [21], while the effect of pressure and brine salinity on the apparent molar volume cannot be neglected for CO 2 +brine solution.…”

Section: Correlation Equationmentioning

confidence: 99%

“…Ohsumi et al [11] measured the densities of liquid CO 2 solution at low CO 2 concentrations at 276.15 K and 34.754 MPa by applying a vibrating -type densitometer. Song et al [12] measured the densities of CO 2 +seawater solution at 276.15 K and 283.15 K and pressure range from (4.0 to 12.0) MPa using Mach -Zehnder interferometry. The experimental results revealed that the density difference between CO 2 +seawater and pure seawater is linearly proportional to the CO 2 mass fraction and independent on pressure, temperature, and salinity.…”

Section: Introductionmentioning

confidence: 99%

Density measurement and equal density temperature of CO2+brine from Dagang — formation from 313 to 363 K

Zhang

Jian

Zhan

et al. 2014

Korean J. Chem. Eng.

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Densities of CO 2 +Dagang -formation brine solution were measured by a magnetic suspension balance (MSB) in the pressure range from (10 to 18) MPa, at the temperatures from (313.15 to 363.15) K and CO 2 mass fractions at 0, 0.0101, 0.0198 and 0.0299. The experimental results revealed that the solution densities increased linearly with the increasing pressure and CO 2 concentration, while decreasing with the increasing temperatures in the experimental range. When the temperature increased from (313.15 to 363.15) K, the slopes of the densities versus (vs.) CO 2 mass fractions decreased from (0.193 to 0.106) g·cm −3 . A correlation equation was developed based on thermodynamic theory and experimental data. The absolute average deviation between the correlation equation and the experimental data was 0.05%, and the maximum deviation was 0.37% for the density of CO 2 +water/brine solution in common geological storage conditions. According to the density of CO 2 -free brine and apparent molar volume of CO 2 in brine, the equal density temperature (T e ) of CO 2 +Dagang brine solution was obtained at 464.67 K when pressure is 10 MPa, which means that the density of brine dissolved with CO 2 will be less than that of CO 2 -free brine when the temperature is higher than 464.67 K at 10 MPa. In this work the formation temperature of the Dagang oilfield reservoir is from 313.15 K to 363.15 K, which is lower than the equal density temperature. Therefore, the safety of CO 2 storage in Dagang oilfield reservoir can be guaranteed.

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“…In the calculations, the total alkalinity was 2300 µmol kg −1 (IOC et al, 2010), which is constant for CO 2 exchange (Zeebe and Wolf-Gladrow, 2001), and the CO 2 molar fraction was 400 ppm. 5 The density change was calculated using ρ/ DIC = 0.0120 g m −3 /(µmol kg −1 ) (Song et al, 2005). Since Bradshaw (1973) found 0.0110 g m −3 /(µmol kg −1 ) and Ohsumi et al (1992) found 0.0128 g m −3 /(µmol kg −1 ), the uncertainty in ρ/ DIC may be 20 %.…”

Section: Air Saturationmentioning

confidence: 99%

The density–salinity relation of standard seawater

et al. 2018

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Abstract. The determination of salinity by means of electrical conductivity relies on stable salt proportions in the North Atlantic Ocean, because standard seawater, which is required for salinometer calibration, is produced from water of the North Atlantic. To verify the long-term stability of the standard seawater composition, it was proposed to perform measurements of the standard seawater density. Since the density is sensitive to all salt components, a density measurement can detect any change in the composition. A conversion of the density values to salinity can be performed by means of a density-salinity relation. To use such a relation with a target uncertainty in salinity comparable to that in salinity obtained from conductivity measurements, a density measurement with an uncertainty of 2 g m −3 is mandatory. We present a new density-salinity relation based on such accurate density measurements. The substitution measurement method used is described and density corrections for uniform isotopic and chemical compositions are reported. The comparison of densities calculated using the new relation with those calculated using the present reference equations of state TEOS-10 suggests that the density accuracy of TEOS-10 (as well as that of EOS-80) has been overestimated, as the accuracy of some of its underlying density measurements had been overestimated. The new density-salinity relation may be used to verify the stable composition of standard seawater by means of routine density measurements.

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The study on density change of carbon dioxide seawater solution at high pressure and low temperature

Cited by 49 publications

References 9 publications

Permanent carbon dioxide storage in deep-sea sediments

Permanent carbon dioxide storage in deep-sea sediments

Density measurement and equal density temperature of CO2+brine from Dagang — formation from 313 to 363 K

The density–salinity relation of standard seawater

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