CO2 storage and gas diffusivity properties of coals from Sydney Basin, Australia

Published on Apr 2, 2007in International Journal of Coal Geology6.806
· DOI :10.1016/J.COAL.2006.03.006
A. Saghafi9
Estimated H-index: 9
(CSIRO: Commonwealth Scientific and Industrial Research Organisation),
Mohinudeen Faiz11
Estimated H-index: 11
(CSIRO: Commonwealth Scientific and Industrial Research Organisation),
D. Roberts1
Estimated H-index: 1
(CSIRO: Commonwealth Scientific and Industrial Research Organisation)
Sources
Abstract
Abstract Measurements of CO 2 adsorption and diffusion properties of coals are reported for various coalfields within Sydney Basin, New South Wales (NSW), Australia. Adsorption measurements were undertaken using a gravimetric method. Measurements carried out on 27 coals show that Sydney Basin coals at CO 2 sub-critical conditions, namely gas pressures below 6 MPa and temperatures below 39 °C, can adsorb a maximum volume (Langmuir volume) of 40 to 80 m 3 of CO 2 per tonne of coal on a dry ash free basis (daf). The coals used in this study are of sub-bituminous to bituminous rank, ranging from 0.66 to 1.45% mean maximum vitrinite reflectance, and are from depths ranging from about 27 m to 723 m. The highest adsorption capacity applies to the highest rank coal, which is also the deepest coal. The standard deviation between Langmuir modeled and measured values is less than 1.5 m 3 /t, corresponding to a relative error of less than 2.7% for all except one coal. Based on adsorption isotherms, the CO 2 storage capacity for in-situ seam pressure conditions range from about 6 to 51 m 3 /t. CO 2 diffusion properties of 15 of these coals, determined using a newly developed system capable of accurately measuring diffusivity of gases in solid coal indicate that CO 2 diffusivity (diffusion coefficient) in the Sydney Basin coals varies from 1.2 × 10 − 6 to 10.2 × 10 − 6  cm 2 /s. The diffusivity does not show any discernable trend with the variation in depth and rank. Porosity measured by a mercury injection method varies from 4 to 10% and decreases with increase in coal depth and rank. For some of the coal samples adsorption measurements for pure CH 4 , CO 2 and N 2 indicate that the Sydney Basin coals can store twice as much CO 2 as CH 4 and six times more CO 2 than N 2 (volume basis). Also, measurement of diffusivity in solid coal samples shows that CO 2 diffuses twice as quickly as CH 4 . The data obtained from this study and the estimated coal resources in the state of New South Wales, allow CO 2 sequestration potentials to be calculated.
📖 Papers frequently viewed together
20046.61Fuel
3 Authors (Xiaojun Cui, ..., Gregory M. Dipple)
References19
Newest
#1Ekrem OzdemirH-Index: 10
#2Badie I. MorsiH-Index: 27
Last. Karl T. SchroederH-Index: 20
view all 3 authors...
Attempts to describe high-pressure carbon dioxide (CO2) adsorption isotherm data using conventional adsorption equations to model the coal behavior have been only partially successful. Because swelling of the coal organic matrix in the presence of adsorbing gases is a well-known phenomenon and because traditional isotherm models assume a rigid structure, an adsorption isotherm equation was derived to account for the volume effects which may occur when an adsorbate alters the structure of an adso...
Source
#1Ripu LamaH-Index: 1
#2A. SaghafiH-Index: 2
Gas and rock outbursts are unwanted complications of underground coal mining, which have occurred over the last 150 years of underground coal mining worldwide and are still occurring. 'Outburst' is a dynamic phenomenon that causes the sudden concurrent release of gas and strata energy. The released energy causes pulverization of large amounts of coal and rocks, which are then ejected into the working areas during mining of the outburst prone zone. This paper discusses some of the 30,000 outburst...
#2Shaofan OuyangH-Index: 2
This paper describes a new experimental technique developed to measure the diffusion coefficient (D) for a coal-methane system using the transient flow mechanism, and examine its dependency on factors that change with continued flow-pressure and gas concentration. Although developed primarily for coalbed methane reservoirs and coal in the gob regions, it also has application in situations where a second gas is injected in coal since it utilizes the principle of counter-diffusion. The results sho...
#1Jerry L. Clayton (USGS: United States Geological Survey)H-Index: 16
Coals are both sources and reservoirs of large amounts of gas that has received increasing attention in recent years as a largely untapped potential energy resource. Coal mining operations, such as ventilation of coalbed gas from underground mines, release coalbed CH4 into the atmosphere, an important greenhouse gas whose concentration in the atmosphere is increasing. Because of these energy and environmental issues, increased research attention has been focused on the geochemistry of coalbed ga...
Source
Bituminous coal seam gases from the Permian Sydney and Bowen basins, Australia, are characterized by (1) methane/ethane ratios greater than or equal to 1000, (2) ^dgr13C and ^dgrD values for methane of -60 ±10^pmil PDB and -217 ±17^pmil SMOW, respectively, (3) carbon dioxide contents of less than 5%, and (4) ^dgr13C(CO<2-CH4) values of 55 ±10^pmil PDB. These data suggest that microbial reduction of CO2 rather than traditional thermogenic reactions is mainly responsible for gas composition. Invas...
Source
#1R. D. LamaH-Index: 1
#2J. BodzionyH-Index: 1
#1Van KrevelenH-Index: 1
Part 1 Coal Typology: Coal as an economic good Coal as fuel and raw material Coal as an organic sediment Coal as a rock Coal as a biological debris Coal as an evolving organic chemical complex Coal as a solid colloid Coal as an enigma in solid state physics Coal as an object of classical chemical analysis Coal as an object of physical analysis. Part 2 Coal Physics: Physical properties and the additivity concept Volumetric properties Optical properties Electrical properties Magnetic properties Me...
#1Dan YeeH-Index: 3
#2John P. SeidleH-Index: 2
Last. William B. HansonH-Index: 2
view all 3 authors...
Source
#1Jeffrey R. LevineH-Index: 1
Source
#1StevensonH-Index: 1
#2W.V. PinczewskiH-Index: 1
Last. S.E. BagioH-Index: 1
view all 4 authors...
Source
Cited By191
Newest
#1Dan Zhou (CUMT: China University of Mining and Technology)H-Index: 1
#2Wei Lu (SDUST: Shandong University of Science and Technology)H-Index: 1
Last. Caifang Wu (CUMT: China University of Mining and Technology)H-Index: 9
view all 5 authors...
Abstract null null Here, incorporating with the experiments of low-temperature oxidation, the adsorption and diffusion of O2 molecules onto macromolecular model of coal vitrinite was simulated via the MD (molecular dynamics) and GCMC (grand canonical monte carlo). The energy variation and the dominated adsorption configuration of O2 were clarified, as well as the RDF (radial distribution function) and the self-diffusion coefficients of various functional groups. The isosteric heat of O2 adsorpti...
Source
#1Kang Chen (SWUFE: Southwestern University of Finance and Economics)H-Index: 1
#2Xianfeng Liu (Chongqing University)H-Index: 11
Last. Tao Yang (North China Institute of Science and Technology)H-Index: 3
view all 0 authors...
Abstract null null The influence of supercritical CO2 (SC-CO2) fluids on pore structure characteristics of coal plays a vital role in geo-sequestration of CO2 into deep coal seams. Changes in coal pore structure and mineral content after exposed to SC-CO2 fluids are quantitatively evaluated by N2/CO2 adsorption and X-ray diffraction (XRD) for a lignite, bituminous and anthracite coals. The SC-CO2 exposure has a notable effect on coal pore distribution. Affected by SC-CO2, the micropore volume wi...
Source
Gas flow in a coal seam is a complex process due to the complicated coal structure and the sorption characteristics of coal to adsorbable gas (such as carbon dioxide and methane). It is essential to understand the gas migration patterns for different fields of engineering, such as CBM exploitation, underground coal mine gas drainage, and CO2 geo-sequestration. Many factors influence gas migration patterns. From the surface production wells, the in-seam patterns of gas content cannot be quantifie...
Source
#1Haiyan Wang (USTB: University of Science and Technology Beijing)H-Index: 2
#2Xin Yang (USTB: University of Science and Technology Beijing)H-Index: 1
Last. Heng Wang (USTB: University of Science and Technology Beijing)H-Index: 1
view all 7 authors...
Abstract The prediction and calculation of the gas diffusion coefficient in a coal matrix is a key scientific issue in the study of gas diffusion behavior in coal. Due to its inherent shortcomings, the diffusion coefficient obtained from analytical models and widely used in academia does not fully reflect the gas diffusion law in actual coal seams. Therefore, numerical models have received increasing attention because they consider the actual conditions of gas diffusion in coal. In this work, fo...
Source
#1Kai Wang (CUMT: China University of Mining and Technology)H-Index: 28
#2Yanhai Wang (CUMT: China University of Mining and Technology)
Last. Guodong Zhang (CUMT: China University of Mining and Technology)
view all 5 authors...
Abstract Multiple gas diffusion mechanisms coexist in the nanopores of coal particle, including Knudsen diffusion, slip flow and transition flow of bulk gas and surface diffusion of adsorbed gas. The contribution of each mechanism to the total gas diffusion quantity varies with gas pressure and pore radius. In this study, a coupled thermal-diffused-mechanical model was constructed considering the multiple gas transport mechanisms. The complex coupling relations among gas adsorption/desorption, g...
Source
#1Changjing Gao (China University of Geosciences (Beijing))H-Index: 1
#2Dameng Liu (China University of Geosciences (Beijing))H-Index: 41
Last. Yufeng Fang (PetroChina)H-Index: 1
view all 5 authors...
The fluids in coal reservoirs mainly consist of different gases and liquids, which show different physical properties, occurrence behaviors, and transport characteristics in the pore-fracture system of coal. In this study, the basic characteristics of fluids in coal reservoirs are firstly reviewed, consisting of coalbed methane (CBM) components and physical properties of CBM/coalbed water. The complex pore-fracture system mainly provides the enrichment space and flow path for fluids, which have ...
Source
#1Yang Bai (Xi'an University of Science and Technology)H-Index: 3
#2Haifei Lin (Xi'an University of Science and Technology)H-Index: 11
Last. Long Hang (Xi'an University of Science and Technology)H-Index: 1
view all 5 authors...
Abstract To research the dynamic mechanism of nitrogen and carbon dioxide displacement of methane, we used the grand canonical Monte Carlo (GCMC) simulation method to determine the lowest energy coal model containing adsorbed methane. The desorption behavior of CH4 after the injection of N2 and CO2 at different temperatures was studied. Results show that CO2 and N2 were mainly used to drive off methane gas by occupying adsorption sites. The total energy of the CH4–CO2 model was lower than that o...
Source
#1Diquan Li (CSU: Central South University)
#2Yuhua Wang (CSU: Central South University)
Last. Nanqiao Zhang (Gas Technology Institute)
view all 6 authors...
Source
#1Hamed Lamei Ramandi (UNSW: University of New South Wales)H-Index: 14
#2Muhammad Asad Pirzada (UNSW: University of New South Wales)H-Index: 4
Last. Hamid Roshan (UNSW: University of New South Wales)H-Index: 24
view all 5 authors...
Abstract Proppant-laden fluid injection has been applied to many low permeability reservoirs, such as coal seams, to enhance permeability and thus production. While there are several laboratory-scale experimental studies on proppant placement in hydraulic fractures, the possible infiltration of proppant into natural fractures and its effect on overall permeability has received little attention. We study proppant injection into a naturally fractured coal sample by a combination of experimental an...
Source
view all 3 authors...
The permeability of more than 70% of coal seams in China is less than 1 mD, creating difficulties in recovering underground coal methane. Therefore, a new technology of high-temperature nitrogen (HTN2) injection into the coal seam was proposed to improve the coal permeability and gas extraction rate. In this paper, the effects of the N2 temperature, injection pressure and cycle number on the permeability of naturally fractured coking coal has been investigated. When HTN2 was injected into coal s...
Source
This website uses cookies.
We use cookies to improve your online experience. By continuing to use our website we assume you agree to the placement of these cookies.
To learn more, you can find in our Privacy Policy.