Near-Fracture Capillary End Effect on Shale-Gas and Water Production
- Riza Elputranto (Texas A&M University) | I. Yucel Akkutlu (Texas A&M University)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- March 2020
- Document Type
- Journal Paper
- 2020.Society of Petroleum Engineers
- water blocking, capillary end effect, shale gas, formation damage, flow back
- 8 in the last 30 days
- 44 since 2007
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Capillary end effect (CEE) develops in tight gas and shale formations near hydraulic fractures during flowback of the fracturing-treatment water and extends into the natural-gas-production period. In this study, a new multiphase reservoir-flow-simulation model is used to understand the role the CEE plays on the removal of the water from the formation and on the gas production. The reservoir model has a matrix pore structure mainly consisting of a network of microfractures and cracks under stress. The model simulates high-resolution water/gas flow in this network with a capillary discontinuity at the hydraulic-fracture/matrix interface.
The simulation results show that the CEE causes significant formation damage during the production period by holding the water saturation near the fracture at higher levels than that using only the spontaneous imbibition of water. The effect makes water less mobile, or trapped, in the formation during the flowback, and tends to block gas flow during the production. The effect during the production is more important relative to the changing stress. We showed that the CEE cannot be removed completely but can be reduced significantly by controlling the production rate.
|File Size||3 MB||Number of Pages||14|
Agrawal, S. and Sharma, M. M. 2013. Liquid Loading within Hydraulic Fractures and Its Impact on Unconventional Reservoir Productivity. Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, Denver, Colorado, USA, 12–14 August. URTEC-1580636-MS. https://doi.org/10.1190/urtec2013-132.
Alafnan, S. F. K. and Akkutlu, I. Y. 2017. Matrix-Fracture Interactions During Flow in Organic Nanoporous Materials Under Loading. Transp Porous Med 121 (4): 69–92. https://doi.org/10.1007/s11242-017-0948-3.
Ashrafi, M. and Helalizadeh, A. 2014. Genetic Algorithm for Estimating Relative Permeability and Capillary Pressure from Unsteady-State Displacement Experiments Including Capillary End-Effect. Energ Source Part A 36 (22): 2443–2448. https://doi.org/10.1080/15567036.2011.572119.
Bear, J. 1988. Dynamics of Fluids in Porous Media. Mineola, New York: Dover Publications.
Bennion, D. B. and Thomas, F. B. 2005. Formation Damage Issues Impacting the Productivity of Low Permeability, Low Initial Water Saturation Gas Producing Formations. J. Energy Resour. Technol. 127 (3): 240–247. https://doi.org/10.1115/1.1937420.
Bertoncello, A., Wallace, J., Blyton, C. et al. 2014. Imbibition and Water Blockage in Unconventional Reservoirs: Well Management Implications During Flowback and Early Production. Paper presented at the SPE/EAGE European Unconventional Resources Conference and Exhibition, Vienna, Austria, 25–27 February. SPE-167698-MS. https://doi.org/10.2118/167698-MS.
Brooks, R. H. and Corey, A. T. 1964. Hydraulic Properties of Porous Media. Fort Collins, Colorado, USA: Hydrology Papers No. 3, Colorado State University.
Cheng, Y. 2012. Impact of Water Dynamics in Fractures on the Performance of Hydraulically Fractured Wells in Gas-Shale Reservoirs. J Can Pet Technol 51 (2): 143–151. SPE-127863-PA. https://doi.org/10.2118/127863-PA.
Christiansen, R. 2005. Capillary End Effects and Gas Production from Low Permeability Formations. Paper presented at the International Symposium of the Society of Core Analysts, Toronto, Canada, 11–15 August. SCA2005-26.
Dacy, J. M. 2010. Core Tests for Relative Permeability of Unconventional Gas Reservoirs. Paper presented at the SPE Annual Technical Conference and Exhibition, Florence, Italy, 19–22 September. SPE-135427-MS. https://doi.org/10.2118/135427-MS.
Donnelly, B. M. 2015. Measurement of Hysteretic Shale Capillary Pressure–Saturation Relationships Using a Water Activity Meter. Master’s thesis, University of Tennessee-Knoxville, Knoxville, Tennessee, USA (August 2015).
Donnelly, B., Perfect, E., McKay, L. D. et al. 2016. Capillary Pressure–Saturation Relationships for Gas Shales Measured Using a Water Activity Meter. J Nat Gas Sci Eng 33 (July): 1342–1352. https://doi.org/10.1016/j.jngse.2016.05.014.
Eveline, V. F., Akkutlu, I. Y., and Moridis, G. J. 2017. Numerical Simulation of Hydraulic Fracturing Water Effects on Shale Gas Permeability Alteration. Transp Porous Med 116 (2): 727–752. https://doi.org/10.1007/s11242-016-0798-4.
Farah, N., Ding, D. Y., and Wu, Y. S. 2015. Simulation of the Impact of Fracturing Fluid Induced Formation Damage in Shale Gas Reservoirs. Paper presented at the SPE Reservoir Simulation Symposium, Houston, Texas, USA, 23–25 February. SPE-173264-MS. https://doi.org/10.2118/173264-MS.
Gangi, A. F. 1978. Variation of Whole and Fractured Porous Rock Permeability with Confining Pressure. Int J Rock Mech Min Sci 15 (5): 249–257. https://doi.org/10.1016/0148-9062(78)90957-9.
Hadley, G. F. and Handy, L. L. 1956. A Theoretical and Experimental Study of the Steady State Capillary End Effect. Paper presented at the Fall Meeting of the Petroleum Branch of AIME, Los Angeles, California, USA, 14–17 October. SPE-707-G. https://doi.org/10.2118/707-G.
Hinkley, R. E. and Davis, L. A. 1986. Capillary Pressure Discontinuities and End Effects in Homogeneous Composite Cores: Effect of Flow Rate and Wettability. Paper presented at the SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, USA, 5–8 October. SPE-15596-MS. https://doi.org/10.2118/15596-MS.
Honarpour, M. M., Nagarajan, N. R., Orangi, A. et al. 2012. Characterization of Critical Fluid, Rock, and Rock-Fluid Properties—Impact on Reservoir Performance of Liquid-Rich Shales. Paper presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA, 8–10 October. SPE-158042-MS. https://doi.org/10.2118/158042-MS.
Huang, D. D. and Honarpour, M. M. 1998. Capillary End Effects in Coreflood Calculations. J Pet Sci Eng 19 (1–2): 103–117. https://doi.org/10.1016/S0920-4105(97)00040-5.
Kyte, J. R. and Rapoport, L. A. 1958. Linear Waterflood Behavior and End Effects in Water-Wet Porous Media. J Pet Technol 10 (10): 47–50. SPE-929-G. https://doi.org/10.2118/929-G.
Leverett, M. C. 1941. Capillary Behavior in Porous Solids. In Transactions of the Society of Petroleum Engineers, Vol. 142, Part I, SPE-941152-G, 152–169. Richardson, Texas, USA: Society of Petroleum Engineers.
Liang, T., Longoria, R. A., Lu, J. et al. 2017. Enhancing Hydrocarbon Permeability After Hydraulic Fracturing: Laboratory Evaluations of Shut-Ins and Surfactant Additives. SPE J. 22 (4): 1011–1023. SPE-175101-PA. https://doi.org/10.2118/175101-PA.
Moghaddam, R. N. and Jamiolahmady, M. 2019. Steady-State Relative Permeability Measurements of Tight and Shale Rocks Considering Capillary End Effect. Transp Porous Media 128 (1): 75–96. https://doi.org/10.1007/s11242-019-01236-8.
Moridis, G. 2014. User’s Manual of the TOUGH + Core Code v1. 5: A General-Purpose Simulator of Non-Isothermal Flow and Transport Through Porous and Fractured Media. Report No. LBNL-6871E, Lawrence Berkeley National Laboratory, Berkeley, California, USA (November 2014).
Osoba, J. S., Richardson, J. G., Kerver, J. K. et al. 1951. Laboratory Measurements of Relative Permeability. J Pet Technol 3 (2): 47–56. SPE-951047-G. https://doi.org/10.2118/951047-G.
Ougier-Simonin, A., Renard, F., Boehm, C. et al. 2016. Microfracturing and Microporosity in Shales. Earth-Sci Rev 162 (November): 198–226. https://doi.org/10.1016/j.earscirev.2016.09.006.
Pruess, K., Oldenburg, C., and Moridis, G. 1998. An Overview of TOUGH2, Version 2.0. Report No. LBNL-41995, Lawrence Berkeley National Laboratory, Berkeley, California, USA.
Richardson, J. G., Kerver, J. K., Hafford, J. A. et al. 1952. Laboratory Determination of Relative Permeability. J Pet Technol 4 (8): 187–196. SPE-952187-G. https://doi.org/10.2118/952187-G.
Scott, H., Patey, I. T. M., and Byrne, M. T. 2007. Relative Permeability Measurements—Proceed with Caution. Paper presented at the European Formation Damage Conference, Scheveningen, The Netherlands, 30 May–1 June. SPE-107812-MS. https://doi.org/10.2118/107812-MS.
Shaoul, J. R., van Zelm, L. F., and de Pater, C. J. 2011. Damage Mechanisms in Unconventional-Gas-Well Stimulation—A New Look at an Old Problem. SPE Prod & Oper 26 (4): 388–400. SPE-142479-PA. https://doi.org/10.2118/142479-PA.
Standing, M. B. 1975. Notes on Relative Permeability Relationships. Lecture Notes, University of Trondheim, Trondheim, Norway, August 1974.
Virnovsky, G. A., Skjaeveland, S. M., Surdal, J. et al. 1995. Steady-State Relative Permeability Measurements Corrected for Capillary Effects. Paper presented at the SPE Annual Technical Conference and Exhibition, Dallas, Texas, USA, 22–25 October. SPE-30541-MS. https://doi.org/10.2118/30541-MS.
Wasaki, A. and Akkutlu, I. Y. 2015. Permeability of Organic-Rich Shale. SPE J. 20 (6): 1384–1396. SPE-170830-PA. https://doi.org/10.2118/170830-PA.