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
- 556 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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