Experimental investigation of immiscible water-alternating-gas injection in ultra-high water-cut stage reservoir
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Abstract
Water-alternating-gas (WAG) injection is recommended as a means of improving gas mobility control. This paper describes a series of coreflood tests conducted to investigate the potential for continuous gas injection and WAG injection in ultra-high water-cut saline reservoirs. The mechanisms of immiscible water-alternating-nitrogen injection on residual oil distribution are analyzed, and pore-scale analysis is conducted. The effect of injection parameters on residual oil distribution and recovery efficiency is also evaluated. Coreflood results show that tertiary oil recovery efficiency is significantly higher using WAG injection than continuous gas injection during the ultra-high water-cut period. Pore-scale visualization illustrates the movement of gas through the waterflooded channels into the pore space previously occupied by water and residual oil, which then becomes trapped. Injected gas breaks the force balance of microscopic residual oil and reduces residual oil saturation. This mobilizes the displaced/collected residual oil into large waterfilled pores and blocks several water channels. WAG flooding can decrease free-gas saturation and increase trapped-gas saturation significantly, resulting in decreased relative permeabilities of gas and water. The experimental results indicate that appropriate WAG design parameters could enhance recovery by 15.62% when the injected pore volume of water and gas in the cycle is 0.3 PV at a gas/water injection ratio of 2:1. The results from this study will allow researchers and reservoir engineers to understand and implement immiscible WAG injection as an enhanced oil recovery method in ultra-high water-cut stage reservoirs.
Cited as: Kong, D., Gao, Y., Sarma, H., Li, Y., Guo, H., Zhu, W. Experimental investigation of immiscible water-alternating-gas injection in ultra-high water-cut stage reservoir. Advances in Geo-Energy Research, 2021, 5(2): 139-152, doi: 10.46690/ager.2021.02.04
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Afzali, S., Ghamartale, A., Rezaei, N., et al. Mathematical modeling and simulation of water-alternating-gas (WAG) process by incorporating capillary pressure and hysteresis effects. Fuel, 2020, 263: 116362.
Afzali, S., Rezaei, N., Zendehboudi, S. A comprehensive review on enhanced oil recovery by water alternating gas (WAG) injection. Fuel, 2018, 227: 218-246.
Akervoll, I., Talukdar, M. S., Midtlyng, S. H., et al. WAG injection experiments with in-situ saturation measurements at reservoir conditions and simulations. Paper SPE 59323 presented at the SPE/DOE Improved Oil Recovery Symposium, Tulsa, Oklahoma, 3-5 April, 2000.
Blunt, M. J. An empirical model for three-phase relative permeability. SPE Journal, 2000, 5(4): 435-445.
Christensen, J. R., Stenby, E. H., Skauge, A. Review of WAG field experience. SPE Reservoir Evaluation & Engineering, 2001, 4(2): 97-106.
Cui, M., Wang, R., Lv, C., et al. Research on microscopic oil displacement mechanism of CO2 EOR in extra-high water cut reservoirs. Journal of Petroleum Science and Engineering, 2017, 154: 315-321.
DiCarlo, D. A., Akshay, S., Blunt, M. J. Three-phase relative permeability of water-wet, oil-wet, and mixed-wet sandpacks. SPE Journal, 2000, 5(1): 82-91.
Fatemi, S. M., Sohrabi, M. Experimental and theoretical investigation of water/gas relative permeability hysteresis: Applicable to water alternating gas (WAG) injection and gas storage processes. Paper SPE 161827 Presented at the Abu Dhabi International Petroleum Conference and Exhibition, Abu Dhabi, UAE, 11-14 November, 2012.
Fatemi, S. M., Sohrabi, M. Experimental investigation of near-miscible water-alternating-gas injection performance in water-wet and mixed-wet systems. SPE Journal, 2013, 18(1): 114-123.
Ghomian, Y., Pope, G. A., Sepehrnoori, K. Hysteresis and field-scale optimization of WAG injection for coupled CO2 -EOR and sequestration. Paper SPE 110639 Presented at the SPE Symposium on Improved Oil Recovery, Tulsa, Oklahoma, USA, 19-23 April, 2008.
Guo, P., Huo, L., Jiang, B., et al. Parameter optimization of water alternating gas of Fang 48 CO2 flooding pilot area. Journal of China University of Petroleum (Edition of Natural Science), 2012, 36(6): 89-93. (in Chinese)
Heiba, A. A., Davis, H. T., Scriven, L. E. Statistical network theory of three-phase relative permeabilities. Paper SPE 12690 Presented at the SPE Enhanced Oil Recovery Symposium, Tulsa, Oklahoma, 15-18 April, 1984.
Hoare, G., Coll, C. Effect of small/medium scale reservoir heterogeneity on the effectiveness of water, gas and water alternating gas WAG injection. Paper SPE 190855 Presented at the SPE Europec featured at 80th EAGE Conference and Exhibition, Copenhagen, Denmark, 11-14 June, 2018.
Itriago, Y. C., Araujo, M., Molinaris, J. Best practices for laboratory evaluation of immiscible WAG. Paper SPE 190303 Presented at the SPE Improved Oil Recovery Conference, Tulsa, Oklahoma, USA, 14-18 April, 2018.
Janssen, M. T., Azimi, F., Zitha, P. L. Immiscible nitrogen flooding in bentheimer sandstones: Comparing gas injection schemes for enhanced oil recovery. Paper SPE 190285 Presented at the SPE Improved Oil Recovery Conference, Tulsa, Oklahoma, USA, 14-18 April, 2018.
Janssen, M. T., Torres Mendez, F. A., Zitha, P. L. Mechanistic modeling of water-alternating-gas injection and foam-assisted chemical flooding for enhanced oil recovery. Industrial & Engineering Chemistry Research, 2020, 59(8): 3606-3616.
Keller, A. A., Blunt, M. J., Roberts, A. P. V. Micromodel observation of the role of oil layers in three-phase flow. Transport in Porous Media, 1997, 26(3): 277-297.
Khanifar, A., Raub, M. R. A., Tewari, R. D., et al. Designing of successful immiscible water alternating gas (IWAG) coreflood experiment. Paper IPTC 18555 Presented at the International Petroleum Technology Conference, Doha, Qatar, 6-9 December, 2015.
Khorsandi, S., Li, L., Johns, R. T. Equation of state for relative permeability, including hysteresis and wettability alteration. SPE Journal, 2017, 22(6): 1915-1928.
Khorshidian, H., James, L. A., Butt, S. D. Pore-level study of the effect of miscibility and wettability on oil recovery during gas assisted gravity drainage. Paper SCA2017-the Society of Core Analysts 31st 057 Presented at Symposium, Vienna, Austria, 27 August-1 September, 2017.
Kong, D., Li, Y., Yu, M., et al. Experimental investigation on block and transport characteristics of foam in porous media for enhanced oil recovery processes. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019, 570: 22-31.
Kong, D., Lian, P., Zhu, W., et al. Pore-scale investigation of immiscible gas-assisted gravity drainage. Physics of Fluids, 2020, 32(12): 122004.
Kulkarni, M. M., Rao, D. N. Experimental investigation of miscible and immiscible Water-Alternating-Gas (WAG) process performance. Journal of Petroleum Science and Engineering, 2005, 48(1-2): 1-20.
Li, B., Li, Y., Kong, D., et al. Research on influence factors and screening method of tight sandstone oil reservoir CO2 huff and puff based on multi-index. Chemical Engineering Transactions, 2016, 55: 343-348.
Liu, H., Zhu, Z., Patrick, W., et al. Pore-scale numerical simulation of supercritical CO2 migration in porous and fractured media saturated with water. Advances in Geo-Energy Research, 2020, 4(4): 419-434.
Liu, Z., Liang, Y., Wang, Q., et al. Status and progress of worldwide EOR field applications. Journal of Petroleum Science and Engineering, 2020, 193: 107449.
Long, L., Li, Y., Gong, H., et al. Investigation of pressure drop of trapped oil in capillaries with circular cross-sections. Industrial & Engineering Chemistry Research, 2018, 57(41): 13866-13875.
Motealleh, M., Kharrat, R., Hashemi, A. An experimental investigation of water-alternating-CO2 coreflooding in a carbonate oil reservoir in different initial core conditions. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2013, 35(13): 1187-1196.
Oren, P. E. Pore-Scale network modelling of waterflood residual oil recovery by immiscible gas flooding. Paper SPE 27814 Presented at the SPE/DOE Improved Oil Recovery Symposium, Tulsa, Oklahoma, 17-20 April, 1994.
Oren, P. E., Billiotte, J., Pinczewski, W. V. Mobilization of waterflood residual oil by gas injection for water-wet conditions. SPE Formation Evaluation, 1992, 7(1): 70-78.
Oren, P. E., Pinczewski, W. V. The effect of wettability and spreading coefficients on the recovery of waterflood residual oil by miscible gasflooding. SPE Formation Evaluation, 1994, 9(2): 149-156.
Pereira, G. G., Pinczewski, W. V., Chan, D. Y. C., et al. Pore-scale network model for drainage-dominated three-phase flow in porous media. Transport in Porous Media, 1996, 24(2): 167-201.
Piri, M., Blunt, M. J. Three-phase threshold capillary pressures in noncircular capillary tubes with different wettabilities including contact angle hysteresis. Physical Review E, 2004, 70(6): 061603.
Ramachandran, K. P., Gyani, O. N., Sur, S. Immiscible hydrocarbon WAG: Laboratory to field. Paper SPE 128848 Presented at the SPE Oil and Gas India Conference and Exhibition, Mumbai, India, 20-22 January, 2010.
Rücker, M., Bartels, W. B., Garfi, G., et al. Relationship between wetting and capillary pressure in a crude oil/brine/rock system: From nano-scale to core-scale. Journal of colloid and interface science, 2020, 562: 159-169.
Shahverdi, H., Sohrabi, M., Fatemi, M., et al. Three-phase relative permeability and hysteresis effect during WAG process in mixed wet and low IFT systems. Journal of Petroleum Science and Engineering, 2011, 78(3-4): 732-739.
Shahverdi, H., Sohrabi, M. Relative permeability characterization for water-alternating-gas injection in oil reservoirs. SPE Journal, 2016, 21(3): 799-808.
Singh, H. Impact of four different CO2 injection schemes on extent of reservoir pressure and saturation. Advances in Geo-Energy Research, 2018, 2(3): 305-318.
Sohrabi, M. T. D. H., Tehrani, D. H., Danesh, A., et al. Visualization of oil recovery by water-alternating-gas injection using high-pressure micromodels. SPE Journal, 2004, 9(3): 290-301.
Sun, L., Wei, P., Pu, W., et al. The oil recovery enhancement by nitrogen foam in high-temperature and high-salinity environments. Journal of Petroleum Science and Engineering, 2016, 147: 485-494.
Valeev, A., Shevelev, A. Design of WAG parameters. Paper SPE 187843 Presented at the SPE Russian Petroleum Technology Conference, Moscow, Russia, 16-18 October, 2017.
Wang, L., He, Y., Wang, Q., et al. Multiphase flow characteristics and EOR mechanism of immiscible CO2 water-alternating-gas injection after continuous CO2 injection: A micro-scale visual investigation. Fuel, 2020, 282: 118689.
Wang, X., Yin, H., Zhao, X., et al. Microscopic remaining oil distribution and quantitative analysis of polymer flooding based on CT scanning. Advances in Geo-Energy Research, 2019, 3(4): 448-456.
Xu, F., Chen, Q., Ma, M., et al. Displacement mechanism of polymeric surfactant in chemical cold flooding for heavy oil based on microscopic visualization experiments. Advances in Geo-Energy Research, 2020, 4(1): 77-85.
Yang, H., Hu, L., Chen, C., et al. Synthesis and plugging behavior of fluorescent polymer microspheres as a kind of conformance control agent in reservoirs. RSC Advances, 2018, 8(19): 10478-10488.
You, Q., Wang, H., Zhang, Y., et al. Experimental study on spontaneous imbibition of recycled fracturing flowback fluid to enhance oil recovery in low permeability sandstone reservoirs. Journal of Petroleum Science and Engineering, 2018, 166: 375-380.
You, Q., Wen, Q., Fang, J., et al. Experimental study on lateral flooding for enhanced oil recovery in bottom-water reservoir with high water cut. Journal of Petroleum Science and Engineering, 2019, 174: 747-756.
Zhang, Y., Gao, M., You, Q., et al. Smart mobility control agent for enhanced oil recovery during CO2 flooding in ultra-low permeability reservoirs. Fuel, 2019, 241: 442-450.
Zhu, W., Ma, Q., Song, Z., et al. The effect of injection pressure on the microscopic migration characteristics by CO2 flooding in heavy oil reservoirs. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2019, doi.org/10.1080/15567036.2019.1644399. (published online)
Zuo, L., Chen, Y., Zhou, D., et al. Three-phase relative permeability modeling in the simulation of WAG injection. SPE Reservoir Evaluation & Engineering, 2014, 17(3): 326-339.
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