Effects of Water Salinity, CO2 Solubility, and Gas Composition on Coal Wettability

Ibrahim, Ahmed Farid; Nasr‐El‐Din, Hisham A.

doi:10.2118/174371-ms

Cited by 9 publications

(10 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…carboxylic or phenolic groups [35]; the concentration of these functional groups depends on the coal rank ( [36] see also FTIR discussion in Section 3.5). The results found here are consistent with Ibrahim and Nasr-El-Din [37] who reported that both zeta potentials and contact angles on coals increased with salinity. Fuerstenau et al [38] reported that for low ash anthracite coal, the zeta potential was measured to be -25 mV at 0.01 M NaCl (pH = 7) at room temperature.…”

Section: Effect Of Salinity On Zeta Potential and Contact Anglesupporting

confidence: 93%

“…Moreover, θa increased from 52° to 60° and θr increased from 44° to 53° when brine composition changed from 1 wt% NaCl to 1 wt% MgCl2 ( Figure 6). The results are consistent with [37] who also reported that coal/brine zeta potentials increased for divalent cations (Ca 2+ and Mg 2+ ). Harvey et al [39] also found that MgCl2 brine resulted in an increase in zeta potential.…”

Section: Effect Of Brine Composition On Zeta Potential and Contact Anglesupporting

confidence: 92%

See 1 more Smart Citation

Influence of surface chemistry on interfacial properties of low to high rank coal seams

Arif

Jones

Barifcani

et al. 2017

Fuel

View full text Add to dashboard Cite

Wettability of CO2/water/coal systems is a fundamental petro-physical parameter, which governs the fluid flow and distribution in coal seams and thus directly affects CO2-storage and methane recovery from unmineable coal seams. The recognition of wettability of coal/CO2/brine systems help to de-risk CO2-storage and enhanced methane recovery projects in coal seams. To understand the factors influencing the wetting characteristics of coals, a detailed examination and characterization of coal surface chemistry is essential and literature data in this context is missing. We thus measured zeta potentials as a function of temperature (298 K-343 K), brine salinity (0 wt% NaCl-5 wt% NaCl) and salt type (NaCl, CaCl2 and MgCl2) for coals of low, medium and high ranks. Further, we measured water advancing and receding contact angles as a function of temperature and salinity for the same experimental matrix in order to associate wettability changes to the surface charge at the coal/brine interface. Moreover, coal surfaces were investigated by Fourier transformed infrared (FTIR) spectroscopy and the surface functional groups responsible for a particular wetting behaviour

show abstract

Section: Effect Of Salinity On Zeta Potential and Contact Anglesupporting

confidence: 93%

Section: Effect Of Brine Composition On Zeta Potential and Contact Anglesupporting

confidence: 92%

Influence of surface chemistry on interfacial properties of low to high rank coal seams

Arif

Jones

Barifcani

et al. 2017

Fuel

View full text Add to dashboard Cite

show abstract

“…Moreover, we found similar trends for low, medium and high rank coals (Figure 7). In the literature, there is a lack of data on the effect of salinity on CO2-wettability of coal, yet our results are consistent with Ibrahim et al [52], who analysed contact angles of CO2-brine-coal systems for brine salinities varying between 0 g/L-15 g/L NaCl), and who reported that contact angles were highest for 15 g/L and lowest for DI water.…”

Section: Effect Of Brine Salinity On Co2-wettability Of Coalsupporting

confidence: 92%

CO2-wettability of low to high rank coal seams: Implications for carbon sequestration and enhanced methane recovery

Arif

Barifcani

Lebedev

et al. 2016

Fuel

101

View full text Add to dashboard Cite

Coal seams offer tremendous potential for carbon geo-sequestration with the dual benefit of enhanced methane recovery. In this context, it is essential to characterize the wettability of the coal-CO2-water system as it significantly impacts CO2 storage capacity and methane recovery efficiency. Technically, wettability is influenced by reservoir pressure, coal seam temperature, water salinity and coal rank. Thus a comprehensive investigation of the impact of the aforementioned parameters on CO2-wettability is crucial in terms of storage site selection and predicting the injectivity behaviour and associated fluid dynamics. To accomplish this, we measured advancing and receding water contact angles using the pendent drop tilted plate technique for coals of low, medium and high ranks as a function of pressure, temperature and salinity and systematically investigated the associated trends. We found that high rank coals are strongly CO2-wet, medium rank coals are weakly CO2-wet, and low rank coals are intermediate-wet at typical storage conditions. Further, we found that CO2wettability of coal increased with pressure and salinity and decreased with temperature irrespective of coal rank. We conclude that at a given reservoir pressure, high rank coal seams existing at low temperature are potentially more efficient with respect to CO2-storage and enhanced methane recovery due to increased CO2-wettability and thus increased adsorption trapping. Reference Pressure Temperature Salinity Coal type Overall Coal rank Chi et al. [42] up to 6.2 MPa 298K DI water Not mentioned Not mentioned Siemons et al. [37] up to 14 MPa 318K DI water Anthracite High Sakurovs and Lavrencic, [36] up to 15 MPa K DI water Bituminous Medium Kaveh et al. [43] up to 16 MPa 318K DI water High volatile bituminous Medium Kaveh et al. [35] up to 16 MPa 318K DI water Semi anthracite, High volatile bituminous High and Medium Saghafi et al. [34] up to 6 MPa 295K DI water Medium volatile bituminous Medium This study up to 20 MPa 308K, 323K

show abstract

“…Fig. Ibrahim and Nasr-El-Din (2015b) showed that the CO 2 adsorption increased as water salinity increased. It shows that, as the injection flow rate increased, the ⌬dps slightly decreased.…”

Section: Results and Discussion: Experimentalmentioning

confidence: 95%

Carbon Dioxide Sequestration in Coal Formations

Ibrahim

Nasr‐El‐Din

2015

Day 4 Wed, December 09, 2015

Self Cite

View full text Add to dashboard Cite

Carbon dioxide (CO 2 ) is the major greenhouse gas emitted in all activities. CO 2 sequestration in coal seams has become an attractive carbon sequestration technology where the injection of CO 2 enhances methane production from coalbeds (ECBM), in addition to storing CO 2 . CO 2 can be retained in coal via three ways: free gas within the pore space or fractures in the coal, adsorbed molecules on the organic surface of coal, and dissolved in groundwater within the coal.This study investigates the effects of the salinity (NaCl) of coal seam water, injection flow rate, and CO 2 state (formation pressure) on the CO 2 sequestration in volatile bitumen coal. To achieve this objective; coreflood tests were conducted on different coal cores. The change in the effective water-coal permeability after CO 2 injection was examined. Also, the displacement efficiency of water by CO 2 was estimated. The experimental data was cross-matched with numerical simulation to estimate the relative permeability curves.The coreflood experiments showed that the effective water permeability in coal decreased during CO 2 injection due to its adsorption onto the coal surface, and reduction of the relative water permeability. Higher formation pressure led to permeability reduction as a result of higher CO 2 adsorption onto the coal surface. The effective water permeability decreased by 8% at 50 psi back pressure, compared to 48% at 1100 psi back pressure. Furthermore, as the injection flow rate increased, the contact time of CO 2 to the coal surface decreased. Hence, the CO 2 adsorption to the coal matrix decreased and the change on effective water permeability slightly decreased. Specifically, the effective water permeability decreased by 48% at 1 cm 3 /min comparing to 41% at 4 cm 3 /min. As salt concentration increased, the change in pressure drop across the core slightly increased, but this effect decreased as formation pressure increased. As the water salinity increased, the coal become more CO 2 wet, and the residual gas saturation increased. Based on these observations, the injection of CO 2 into highly volatile bitumen coal seams for CO 2 sequestration and ECBM purposes is more efficient as the salt concentration increases and high injection pressure.

show abstract

Effects of Water Salinity, CO2 Solubility, and Gas Composition on Coal Wettability

Cited by 9 publications

References 30 publications

Influence of surface chemistry on interfacial properties of low to high rank coal seams

Influence of surface chemistry on interfacial properties of low to high rank coal seams

CO2-wettability of low to high rank coal seams: Implications for carbon sequestration and enhanced methane recovery

Carbon Dioxide Sequestration in Coal Formations

Contact Info

Product

Resources

About