Imbibition Oil Recovery from the Montney Core Plugs: The Interplay of Wettability, Osmotic Potential and Microemulsion Effects
- Lin Yuan (University of Alberta) | Hassan Dehghanpour (University of Alberta) | Ann Ceccanese (Birchcliff Energy Ltd)
- Document ID
- Society of Petroleum Engineers
- SPE Western Regional Meeting, 23-26 April, San Jose, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- Imbibition Oil Recovery, Microemulsion, Wettability, Osmotic Potential
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This paper presents a series of rock-fluid experiments to investigate 1) wettability of several core plugs from the Montney Formation and its correlations with other petrophysical properties such as pore-throat-radius size distribution, and 2) effects of wettability, salinity and microemulsion (ME) additive on imbibition oil recovery. First, we evaluate wettability by conducting spontaneous imbibition experiments using reservoir oil and brine (with salinity of 141,000 ppm) on six twin core plugs from the Montney Formation. In addition, we investigate the correlations between wettability and other petrophysical properties obtained from MICP data and tight-rock analyses. Second, we inject oil into brine-saturated core plugs to arrive at residual water saturation. Third, we perform soaking experiments on oil-saturated core plugs using fresh water, reservoir brine and ME system, and measure the volume of produced oil with respect to time.
We observe faster and higher oil imbibition into the core plugs compared with brine imbibition, suggesting the strong affinity of the samples to oil. The normalized imbibed volume of oil (Io) is positively correlated to the volume fraction of small pores, represented by the tail part of MICP pore-throat-radius size distribution profiles. This suggests that the tight parts of the pore network are preferentially oil-wet and host reservoir oil under in-situ conditions. The results of soaking experiments show that imbibition oil recovery is positively correlated to the water-wet porosity measured by spontaneous brine imbibition into the dry core plugs. Imbibition of fresh water results in around 3% (of initial oil volume in place) higher oil recovery compared with that of brine imbibition, possibly due to osmotic potential. Soaking the oil-saturated core plugs in ME solution after brine or fresh soaking results in 1-2% incremental oil recovery. Soaking the oil-saturated core plugs immediately in ME solution results in faster oil recovery compared with the case when the plugs are first soaked in water and then in ME solution.
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Bustin, R. M., Bustin, A. M., Cui, A., Ross, D., and Pathi, V. M. (2008). Impact of shale properties on pore structure and storage characteristics, SPE shale gas production conference, Society of Petroleum Engineers. https://doi.org/10.2118/119892-MS.
Brown, R. J., and Fatt, I. (1956, January). Measurements of fractional wettability of oil fields' rocks by the nuclear magnetic relaxation method. In Fall Meeting of the Petroleum Branch of AIME. Society of Petroleum Engineers. https://doi.org/10.2118/743-G.
Begum, M., Yassin, M.R., and Dehghanpour, H. (2017, February). Rock-Fluid Interactions in the Duvernay Formation: Measurement of Wettability and Imbibition Oil Recovery. In SPE Unconventional Resources Conference. Society of Petroleum Engineers. https://doi.org/10.2118/185065-MS.
Clarkson, C. R., Freeman, M., He, L., Agamalian, M., Melnichenko, Y., Mastalerz, M., Bustin, R., Radlinski, A., and Blach, T. (2012). Characterization of tight gas reservoir pore structure using USANS/SANS and gas adsorption analysis, Fuel 95, 371-385. https://doi.org/10.2118/155537-MS.
Chalmers, G. R., Bustin, R. M., and Power, I. M. (2012). Characterization of gas shale pore systems by porosimetry, pycnometry, surface area, and field emission scanning electron microscopy/transmission electron microscopy image analyses: Examples from the Barnett, Woodford, Haynesville, Marcellus, and Doig units, AAPG bulletin 96(6), 1099–1119.
Cui, A., Wust, R., Nassichuk, B., Glover, K., Brezovski, R., and Twemlow, C. (2013). A nearly complete characterization of permeability to hydrocarbon gas and liquid for unconventional reservoirs: a challenge to conventional thinking, Unconventional Resources Technology Conference, Society of Exploration Geophysicists, American Association of Petroleum Geologists, Society of Petroleum Engineers, pp. 1716-1732. https://doi.org/10.15530/URTEC-1578611-MS.
Donaldson, E. C., Thomas, R. D., and Lorenz, P. B. (1969). Wettability determination and its effect on recovery efficiency. Society of Petroleum Engineers Journal, 9(01), 13-20. https://doi.org/10.2118/2338-PA.
Gruener, S., Hermes, H. E., Schillinger, B., Egelhaaf, S. U., and Huber, P. (2016). Capillary rise dynamics of liquid hydrocarbons in mesoporous silica as explored by gravimetry, optical and neutron imaging: Nano-rheology and determination of pore size distributions from the shape of imbibition fronts. Colloids Surf. A Physicochem. Eng. Asp. 496, 13–27.
Handwerger, D. A., Keller, J., and Vaughn, K. (2011). Improved Petrophysical Core Measurements on Tight Shale Reservoirs Using Retort and Crushed Samples. Presented at the SPE Annual Technical Conference and Exhibition, Denver, 30 October–2 November. SPE-147456-MS. https://doi.org/10.2118/147456-MS.
Habibi, A., Dehghanpour, H., Binazadeh, M., Bryan, D., and Uswak, G., (2016). Advances in Understanding Wettability of Tight Oil Formations: A Montney Case Study, SPE Reservoir Evaluation & Engineering 19(04) 583-603. https://doi.org/10.2118/175157-PA.
Kamari, A., Nikookar, M., Hemmati-Sarapardeh, A., Sahranavard, L., and Mohammadi, A. H. (2014). SCREENING OF POTENTIAL APPLICATION OF EOR PROCESSES IN A NATURALLY FRACTURED OIL RESERVOIR. Enhanced Oil Recovery: Methods, Economic Benefits and Impacts on the Environment, Nova Science Publishers Inc., NY, USA.
Lan, Q., Dehghanpour, H., Wood, J., and Sanei, H. (2015). Wettability of the Montney tight gas formation, SPE Reservoir Evaluation & Engineering 18(03) 417-431. https://doi.org/10.2118/171620-PA.
Lan, Q., Xu, M., Dehghanpour, H., and Wood, J. (2014, October). Advances in understanding wettability of tight and shale gas formations. In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers. https://doi.org/10.2118/170969-MS.
Morrow, N., and Buckley, J. (2011). Improved oil recovery by low-salinity waterflooding. Journal of Petroleum Technology, 63(05), 106-112. https://doi.org/10.2118/129421-JPT.
Ma, S. M., Zhang, X., Morrow, N. R., and Zhou, X. (1999). Characterization of wettability from spontaneous imbibition measurements. Journal of Canadian Petroleum Technology, 38(13). https://doi.org/10.2118/99-13-49.
Salathiel, R. A. (1973). Oil recovery by surface film drainage in mixed-wettability rocks. Journal of Petroleum Technology, 25(10), 1-216. https://doi.org/10.2118/4104-PA.
Webb, K. J., Black, C. J. J., and Edmonds, I. J. (2005, April). Low salinity oil recovery–The role of reservoir condition corefloods. In IOR 2005-13th European Symposium on Improved Oil Recovery. https://doi.org/10.2118/149077-MS.
Yassin, M. R., Dehghanpour, H., Wood, J., and Lan, Q. (2016). A theory for relative permeability of unconventional rocks with dual-wettability pore network, SPE Journal. https://doi.org/10.2118/178549-PA.
Yassin, M. R., Begum, M., Dehghanpour, H., and Dunn, L. (2018). Evaluation of Imbibition Oil Recovery in the Duvernay Formation. SPE Reservoir Evaluation & Engineering, 21(02), 257-272. https://doi.org/10.2118/185065-PA.
Zhang, Y., Xie, X., and Morrow, N. R. (2007, January). Waterflood performance by injection of brine with different salinity for reservoir cores. In SPE annual technical conference and exhibition. Society of Petroleum Engineers. https://doi.org/10.2118/109849-MS.