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Transport in Porous Media

, Volume 123, Issue 1, pp 1–20 | Cite as

Stress-Dependent In Situ Gas Permeability in the Eagle Ford Shale

  • Athma R. Bhandari
  • Peter B. Flemings
  • Ronny Hofmann
  • Peter J. Polito
Article
  • 313 Downloads

Abstract

We measured argon gas permeability in three intact and one partially fractured Eagle Ford Shale samples documenting the stress dependence of horizontal (bedding parallel) in situ permeability of intact samples which varies between 1 and 10 nD (1 nD = 0.9869233 × 10−21 m2), while the permeability of partially fractured sample varies between 18 and 37 nD. For all samples, permeability decreases by up to an order of magnitude while cycling the confining pressure (PC) between 27.7 and 55.2 MPa at a constant pore pressure (PP) of 14.4 MPa. Most of the permeability decrease is within the first loading and unloading cycle. During this first cycle, we also observe less than 2% decline in permeability over ~ 10 days when we held the PC constant at 51.6–55.2 MPa, respectively. This suggests that the ongoing creep plays a relatively minor role. The subsequent PC cycles result in a small decrease in permeability (~ 6 to 26% variation between the start and the end of each cycle). We interpret that the initial permeability loss is due to the closing of micro-fractures—which we infer are caused by stress relief and gas expansion during sample retrieval and/or preparation. We interpret that the higher permeability of the partially fractured sample is mainly due to incomplete closure of a preexisting fracture, which extends nearly two-third the sample length. We document this dual-permeability structure from the observation of a dual-timescale pressure response behavior during the experiments at lower PCPP. We find permeability decreases with increasing PCPP; stress dependency of permeability follows an exponential relationship with a stress-sensitive gradient of 0.019–0.040 MPa−1. A better understanding of permeability variation with stress will help to reliably estimate in situ permeability and to better understand production evolution from unconventional shale reservoirs.

Keywords

Pulse-decay permeability Hysteresis Creep In situ permeability Inter-particle pores 

Notes

Acknowledgements

This research project is funded by Shell under the Shell-UT Unconventional Research (SUTUR) program. We thank Shell for providing the two samples from SW3 well. We thank the Mudrock System Research Laboratory (MSRL) and its sponsors for providing access to the two samples from K2 well. We also thank Lucy T. Ko for the SEM images of the samples from K2 well, Patrick Smith for taking the SEM images of the samples from SW3 well and Dr. Jessica Maisano for taking the microscale X-ray computed tomography images of the test core plugs. We are grateful to Drs. Robert Dombrowski, Mikhail Geilikman, Robert Loucks and Stephen Ruppel for guidance and fruitful discussions.

Supplementary material

11242_2018_1021_MOESM1_ESM.docx (42 kb)
Supplementary material 1 (DOCX 42 kb)

References

  1. Achang, M., Pashin, J.C., Cui, X.: The influence of particle size, microfractures, and pressure decay on measuring the permeability of crushed shale samples. Int. J. Coal Geol. 183, 174–187 (2017).  https://doi.org/10.1016/j.coal.2017.09.012 CrossRefGoogle Scholar
  2. Alnoaimi, K.R., Kovscek, A.R.: Experimental and numerical analysis of gas transport in shale including the role of sorption: SPE paper 166375. In: SPE Annual Technical Conference and Exhibition Held in New Orleans, Louisiana, USA, pp. 1–16 (2013)Google Scholar
  3. Armitage, P.J., Faulkner, D.R., Worden, R.H., Aplin, A.C., Butcher, A.R., Iliffe, J.: Experimental measurement of, and controls on, permeability and permeability anisotropy of caprocks from the CO2 storage project at the Krechba Field, Algeria. J. Geophys. Res. Solid Earth 116, B12208 (2011).  https://doi.org/10.1029/2011JB008385 CrossRefGoogle Scholar
  4. Behnsen, J., Faulkner, D.R.: Water and argon permeability of phyllosilicate powders under medium to high pressure. J. Geophys. Res. Solid Earth 116, B12203 (2011).  https://doi.org/10.1029/2011JB008600 CrossRefGoogle Scholar
  5. Bertoncello, A., Honarpour, M.M.: Standards for characterization of rock properties in unconventional reservoirs: fluid flow mechanism, quality control, and uncertainties: SPE paper 166470. In: SPE Annual Technical Conference and Exhibition, Society of Petroleum Engineers, New Orleans, Louisiana, USA (2013).  https://doi.org/10.2118/166470-ms
  6. Bhandari, A.R., Flemings, P.B., Polito, P.J., Cronin, M.B., Bryant, S.L.: Anisotropy and stress dependence of permeability in the Barnett Shale. Transp. Porous Media 108(2), 393–411 (2015).  https://doi.org/10.1007/s11242-015-0482-0 CrossRefGoogle Scholar
  7. Brace, W.F., Walsh, J.B., Frangos, W.T.: Permeability of granite under high pressure. J. Geophys. Res. 73(6), 2225–2236 (1968).  https://doi.org/10.1029/JB073i006p02225 CrossRefGoogle Scholar
  8. Chenevert, M.E., Amanullah, M.: Shale preservation and testing techniques for borehole-stability studies. SPE Drill. Complet. SPE 73191, 146–149 (2001)CrossRefGoogle Scholar
  9. Clarkson, C.R.: Production data analysis of unconventional gas wells: review of theory and best practices. Int. J. Coal Geol. 109–110, 101–146 (2013).  https://doi.org/10.1016/j.coal.2013.01.002 CrossRefGoogle Scholar
  10. Dai, S., Santamarina, J.C.: Sampling disturbance in hydrate-bearing sediment pressure cores: NGHP-01 expedition, Krishna–Godavari Basin example. Mar. Pet. Geol. A 58, 178–186 (2014).  https://doi.org/10.1016/j.marpetgeo.2014.07.013 CrossRefGoogle Scholar
  11. Dicker, A.I., Smits, R.M.: A practical method for determining permeability from laboratory pressure-pulse decay measurements: SPE paper. In: vol. 17578, pp. 285–292 (1988)Google Scholar
  12. EIA: International Energy Outlook 2016. Rep. DOE/EIA-0484(2016), p. 290 (2016)Google Scholar
  13. Firouzi, M., Alnoaimi, K., Kovscek, A., Wilcox, J.: Klinkenberg effect on predicting and measuring helium permeability in gas shales. Int. J. Coal Geol. 123, 62–68 (2014).  https://doi.org/10.1016/j.coal.2013.09.006 CrossRefGoogle Scholar
  14. Grathoff, G.H., Peltz, M., Enzmann, F., Kaufhold, S.: Porosity and permeability determination of organic-rich Posidonia shales based on 3-D analyses by FIB-SEM microscopy. Solid Earth 7(4), 1145–1156 (2016).  https://doi.org/10.5194/se-7-1145-2016 CrossRefGoogle Scholar
  15. Heller, R., Vermylen, J., Zoback, M.: Experimental investigation of matrix permeability of gas shales. AAPG Bull. 98(5), 975–995 (2014).  https://doi.org/10.1306/09231313023 CrossRefGoogle Scholar
  16. Hsieh, P.A., Tracy, J.V., Neuzil, C.E., Bredehoeft, J.D., Silliman, S.E.: A transient laboratory method for determining the hydraulic properties of tight rocks. 1. Theory. Int. J. Rock Mech. Min. Sci. 18(3), 245–252 (1981).  https://doi.org/10.1016/0148-9062(81)90979-7 CrossRefGoogle Scholar
  17. Ilhan, M.A.: Understanding coring operations for shale gas exploration. In: Hill, P.L.D., Curtis, J. (eds.) Gas Shale in the Rocky Mountains and Beyond, pp. 229–239. Rocky Mountain Association of Geologists 2008 Guidebook CD (2008)Google Scholar
  18. Jones, S.C.: A technique for faster pulse-decay permeability measurements in tight rocks. In: SPE Formation Evaluation (SPE 28450), pp. 19–25 (1997)Google Scholar
  19. Klinkenberg, L.J.: The permeability of porous media to liquids and gases. In: Drilling and Production Practices, pp. 200–213 (1941)Google Scholar
  20. Ko, L.T., Loucks, R.G., Ruppel, S.C., Tongwei, Z., Peng, S.: Origin and characterization of Eagle Ford pore networks in the South Texas Upper Cretaceous shelf. AAPG Bull. (2017).  https://doi.org/10.1306/08051616035 Google Scholar
  21. Kosanke, T., Warren, A.: Geological controls on matrix permeability of the eagle ford shale (cretaceous), South Texas, U.S.A. In: Memoir 110: The Eagle Ford Shale: A Renaissance in U.S. Oil Production, pp. 285–300 (2016)Google Scholar
  22. Letham, E.A., Bustin, R.M.: Klinkenberg gas slippage measurements as a means for shale pore structure characterization. Geofluids 16(2), 264–278 (2016).  https://doi.org/10.1111/gfl.12147 CrossRefGoogle Scholar
  23. Luffel, D.L., Hopkins, C.W., Holditch, S.A., Schetter, P.D.: Matrix permeability measurement of gas productive shales. In: Society of Petroleum Engineers Annual Technical Conference and Exhibition, Houston, Texas. SPE Paper 26633, p. 10 (1993)Google Scholar
  24. Mathur, A., Sondergeld, C.H., Rai, C.S.: Comparison of steady-state and transient methods for measuring shale permeability: SPE paper 180259. In: SPE Low Perm Symposium. Society of Petroleum Engineers, Denver, Colorado, USA (2016).  https://doi.org/10.2118/180259-MS
  25. Morrow, C.A., Bo-Chong, Z., Byerlee, J.D.: Effective pressure law for permeability of Westerly Granite under cycling loading. J. Geophys. Res. 91(B3), 3870–3876 (1986)CrossRefGoogle Scholar
  26. Peng, S., Loucks, B.: Permeability measurements in mudrocks using gas-expansion methods on plug and crushed-rock samples. Mar. Pet. Geol. 73, 299–310 (2016).  https://doi.org/10.1016/j.marpetgeo.2016.02.025 CrossRefGoogle Scholar
  27. Rosen, R., Mickelson, W., Sharf-Aldin, M., Kurtoglu, B., Kosanke, T., PaiAngle, M. Patterson, R., Mir, F., Narasimhan, S., Amini, A.: Impact of experimental studies on unconventional reservoir mechanisms: SPE paper 168965. In: SPE Unconventional Resources Conference, The Woodlands, Texas (2014)Google Scholar
  28. Rydzy, M.B., Patino, J., Elmetni, N., Appel, M.: Stressed permeability in shales: effects of matrix compressibility and fractures—a step towards measuring matrix permeability in fractured shale samples: SCA paper SCA2016-027. Paper Presented at International Symposium of the Society of Core Analysts, Snowmass, Colorado, USA, 21–26 Aug 2016Google Scholar
  29. Selvadurai, A.P.S., Glowacki, A.: Permeability hysterisis of limestone during isotropic compression. Ground Water 46(1), 113–119 (2008)Google Scholar
  30. Sondergeld, C.H., Newsham, K.E., Comisky, J.T., Rice, M.C., Rai, C.S.: Petrophysical considerations in evaluating and producing shale gas resources: SPE paper 131768. In: SPE Unconventional Gas Conference, Society of Petroleum Engineers, Pittsburgh, Pennsylvania, USA (2010).  https://doi.org/10.2118/131768-MS
  31. Teklu, T.W., Li, X., Zhou, Z., Cui, Q., Abass, H.: Fracture and matrix permeability hysteresis in organic rich mudrocks: URTeC paper 2431080. In: Unconventional resources technology conference. Unconventional Resources Technology Conference, San Antonio, Texas, USA (2016).  https://doi.org/10.15530/urtec-2016-2431080
  32. Tinni, A., Fathi, E., Agarwal, R., Sondergeld, C., Akkutlu, Y., Rai, C.: Shale permeability measurements on plugs and crushed samples: SPE paper 162235. In: SPE Canadian Unconventional Resources Conference, Calgary, Alberta, Canada (2012)Google Scholar
  33. Walsh, J.B.: Effect of pore pressure and confining pressure on fracture permeability. Int. J. Rock Mech. Min. Sci. Geomech. Abst. 18(5), 429–435 (1981).  https://doi.org/10.1016/0148-9062(81)90006-1 CrossRefGoogle Scholar
  34. Wust, R.A.J., Cui, A., Nassichuk, B., Brezovski, R., Letham, E., Bustin, R.M.: Improved understanding of Gas/Liquid Transport in Unconventional Shales of the Eagle Ford (USA), Montney (Canada), and REM (Australia) through micro-morphological and laboratory analyses of rock fabric and pore sizes: SPE paper 1715134. In: SPE Asia Pacific Oil and Gas Conference, Adeliade, Australia (2014)Google Scholar
  35. Ziarani, A.S., Aguilera, R.: Knudsen’s permeability correction for tight porous media. Transp. Porous Med. 91, 239–260 (2012).  https://doi.org/10.1007/s11242-011-9842-6 CrossRefGoogle Scholar
  36. Zubizarreta, I., Byrne, M., Sorrentino, Y., Rojas, E.: Pore pressure evolution, core damage and tripping out schedules: a computational fluid dynamics approach. In: SPE/IADC 163527 (2013)Google Scholar

Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • Athma R. Bhandari
    • 1
  • Peter B. Flemings
    • 1
    • 2
  • Ronny Hofmann
    • 3
  • Peter J. Polito
    • 2
  1. 1.Institute for Geophysics, Jackson School of GeosciencesThe University of Texas at Austin™AustinUSA
  2. 2.Department of Geological Sciences, Jackson School of GeosciencesThe University of Texas at Austin™AustinUSA
  3. 3.Shell International Exploration and Production Inc.HoustonUSA

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