Laboratory Measurement of Sorption Isotherm under Confining Stress with Pore-Volume Effects
- Jose M. Santos (Ecopetrol) | I. Yucel Akkutlu (Texas A&M University)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- August 2013
- Document Type
- Journal Paper
- 924 - 931
- 2013. Society of Petroleum Engineers
- 5.6.2 Core analysis, 5.3.1 Flow in porous media
- 2 in the last 30 days
- 657 since 2007
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For unconventional gas resources such as coal and organic-rich shale,sorbed-phase is an important component of storage and transport calculations.Routine measurements of sorption are, however, performed separately from theporosity and permeability measurements. In this work, a new gas-storagemeasurement technique is proposed that combines the porosity and sorptionmeasurements. Because the measurement is performed by use of core plug underconfining stress, it allows investigating the storage capacity for varyingeffective stress and incorporating the storage data into a subsequentpermeability measurement under the same conditions.
During the construction of the sorption isotherm in the laboratory with thevolumetric (gas expansion) method, at each pressure step, the sorbed gas takenup by the sample reduces the pore volume (PV) of the sample. As a result, theinitially determined PV at low pressure must be corrected at the beginning andat the end of the pressure step. This correction can be performed relativelyeasily during the routine sorption measurements with the crushed samples;however, it is a challenging task with core plugs under confining stressbecause at each pressure step the PV could also change as a result of porecompressibility. Our approach is based on a new analytical model of total gasstorability developed to interpret the measured multiple-step pressure data ona graphical domain in which the storage-parameter estimation can be performedfast and accurately with a straight line. The approach considers both thecompressibility and sorbed-phase effects on the porosity and the sorptionparameters.
Experimental storage data of shale and coal samples with varying totalorganic content (TOC) and maturity are used to demonstrate the applicability ofthe analytical method to the measurements. The results show that the sorptionmeasurements can be performed with increased accuracy and relatively fast. Thework is important for organic-rich sample characterization in the laboratory,and for gas-in-place and transport calculations.
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Akkutlu, I.Y. and Fathi, E. 2012. Multi-Scale Gas Transport in Shales WithLocal Kerogen Heterogeneities. SPE J. 17 (4): 1002-1011. http://dx.doi.org/10.2118/146422-PA.
Ambrose, R.J., Hartman, R.C., Diaz-Campos, M. et al. 2012. ShaleGas-in-place Calculations Part I--New Pore-Scale Considerations. SPE J. 17 (1): 219-229. http://dx.doi.org/10.2118/131772-PA.
Arumugam, A. 2004. High-Pressure Adsorption of Pure Coalbed Gases on DryCoals. MSc thesis, Oklahoma State University, Stillwater, Oklahoma.
Diaz-Campos, M. 2010. Uncertainties in Shale Gas In-place Calculations:Molecular Simulation Approach. MSc thesis, University of Oklahoma, Norman,Oklahoma.
Hall, F.E., Jr. 1993. Adsorption of Pure and Multicomponent Gases on WetFruitland Coal. MS thesis, Oklahoma State University, Stillwater, Oklahoma
Hartman, R.C., Ambrose, R.Y., Akkutlu, I.Y. et al. 2011. Shale Gas in-placeCalculations Part II--Multi-Component Gas Adsorption. Paper SPE 144097presented at the SPE Unconventional Gas Conference, Woodlands, Texas, 14-16June. http://dx.doi.org/10.2118/144097-MS.
Kang, S.M. 2011. Carbon Dioxide Storage Capacity of Barnett Shale.MSc thesis, University of Oklahoma, Norman, Oklahoma.
Kang S.M., Fathi, E., Ambrose, R.J. et al. 2011. CO2Applications: Carbon Dioxide Storage Capacity of Organic-Rich Shales. SPEJ. 16 (4): 842-855. http://dx.doi.org/10.2118/134583-PA.
Koleowo, O. 2010. Gas Storage Capacity of Coal as an Elastic Medium.MSc thesis, University of Oklahoma, Norman, Oklahoma.
Krooss, B.M., van Bergen, F., Gensterblum, Y. et al. 2002. High-PressureMethane and Carbon Dioxide Adsorption on Dry and Moisture-EquilibratedPennsylvanian Coals. Int. J. of Coal Geology 51: 69-92.
Mavor, M.J., Owen, L.B., and Pratt, T.J. 1990. Measurement and Evaluation ofCoal Sorption Isotherm Data. Paper SPE 20728 presented at the SPE Annualtechnical Conference and Exhibition, New Orleans, Louisiana, 23-26 September.http://dx.doi.org/10.2118/20728-MS.
Ono, S. and Kondo, S. 1960. Molecular Theory of Surface Tension in Liquids.In Encyclopedia of Physics, ed. S. Flugge, Vol. X. Springer-Verlag,Gottingen.
Rahmani Didar, B. 2012. Multi-Component Shale Gas In-place Calculations. MScthesis, University of Oklahoma, Norman, Oklahoma.
Rahmani Didar, B. and Akkutlu, I.Y. 2013. Pore-Size Dependence of FluidPhase Behavior and Properties in Organic-Rich Shale Reservoirs. Paper SPE13OCS-P-220 presented at the SPE International Symposium on Oilfield Chemistry,The Woodlands, Texas, 8-10 April. http://dx.doi.org/10.2118/12OCS-P-220-MS.
Reich, R., Ziegler, W.T., and Rogers, K.A. 1980. Adsorption of Methane,Ethane, and Ethylene Gases and Their Binary and Ternary Mixtures and CarbonDioxide on Activated Carbon at 212-301 K and Pressures to 35 Atmospheres.Ind. Eng. Chem. Process Des. Dev. 19: 336.
Santos, J.M. 2012. Gas Sorption Measurements Under Effective Stress andAdsorption Layer Effect. MSc thesis, University of Oklahoma, Norman,Oklahoma.
Sudibandriyo, M., Pan, Z., Fitzgerald, J.E. et al. 2003. Adsorption ofMethane, Nitrogen, Carbon Dioxide, and Their Binary Mixtures on Dry ActivatedCarbon at 318.2 K and Pressures up to 13.6 MPa. Langmuir 19: 5323-5331.
Taylor, J.R 1997. An Introduction to Error Analysis: The Study ofUncertainties in Physical Measurements, second edition. Sausalito,California: University Science Books.
Vermesse, J., Vidal, D., and Malbrunot, P. 1996. Gas Adsorption on Zeolitesat High Pressure. Langmuir 12: 4190-4196.
Zhou, L., Zhou, Y., Bai, S. et al. 2001. Determination of the Adsorbed PhaseVolume and Its Application in Isotherm Modeling for the Adsorption ofSupercritical Nitrogen on Activated Carbon. J. of Colloid and InterfaceSci. 239: 33-38.