Measurement and Effecting Factors of Nitrogen Diffusion Coefficient in Vug-fracture Reservoir

doi:10.11885/j.issn.1674-5086.2019.09.18.02

Abstract

Abstract: Diffusion coefficient is an important parameter for studying the mechanism of enhanced recovery by gas injection and numerical simulation. In this paper, pressure decay method is utilized to determine the N₂ diffusion coefficient under the condition of high temperature and high pressure in Tahe Oilfield. Not only the effects of oil viscosity and gas composition on N₂ diffusion coefficient in the bulk oil phase are analyzed, but the determination and comparison of N₂ diffusion coefficient in different filling model of fracture-cave carbonate reservoirs of Tahe Oilfield are studied. The solubility and diffusion coefficient of nitrogen in heavy oil are lower than in light oil, but more sensitive to pressure variation than in light oil. The mixing of CO₂ contributes the diffusion process. Diffusion results of nitrogen in the breccia, silt and tight media show that the tighter the filling model is, the more difficult it is for nitrogen to diffuse into the filling medium. The diffusion coefficient of nitrogen in the tight medium reaches the order of magnitude of solid diffusion coefficient (×10^-11 m²/s). Besides, the rise of water saturation in the filling medium also retards the diffusion process of nitrogen in the filling medium. This paper presents the N₂ diffusion coefficient in bulk oil phase and filling model of fracture-cave carbonate reservoirs under condition of high temperature and high pressure conditions (temperature >100 ℃, pressure >20 MPa) for the first time, and analyzes the related influencing factors. The results furthers understanding of EOR mechanism of gas injection, and offers strategic insights for field application of nitrogen injection.

Key words: fracture-cave reservoirs in Tahe Oilfield, high temperature and high pressure, N₂ diffusion coefficient, filling media, water saturation

CLC Number:

TE344

SONG Chuanzhen, ZHU Guiliang, LIU Zhongchun. Measurement and Effecting Factors of Nitrogen Diffusion Coefficient in Vug-fracture Reservoir[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 95-103.

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References

[1] 刘中春,李江龙,吕成远,等. 缝洞型油藏储集空间类型对油井含水率影响的实验研究[J]. 石油学报, 2009, 30(2):271-274. doi:10.3321/j.issn:0253-2697.2009.02.020 LIU Zhongchun, LI Jianglong, LÜ Chengyuan, et al. Experimental study on effect of reservoir space types on water cut of wells in karstic-fractured carbonate reservoir[J]. Acta Petrolei Sinica, 2009, 30(2):271-274. doi:10.3321/j.issn:0253-2697.2009.02.020
[2] 惠健,刘学利,汪洋,等. 塔河油田缝洞型油藏单井注氮气采油机理及实践[J]. 新疆石油地质, 2015, 36(1):75-77. doi:10.7657/XJPG20150114 HUI Jian, LIU Xueli, WANG Yang, et al. Mechanism and practice of nitrogen injection for EOR in fractured-vuggy carbonate reservoir in Tahe Oilfield, Tarim Basin[J]. Xinjiang Petroleum Geology, 2015, 36(1):75-77. doi:10.7657/XJPG20150114
[3] 荣元帅,赵金洲,鲁新便,等. 碳酸盐岩缝洞型油藏剩余油分布模式及挖潜对策[J]. 石油学报, 2014, 35(6):1138-1146. doi:10.7623/syxb201406011 RONG Yuanshuai, ZHAO Jinzhou, LU Xinbian, et al. Remaining oil distribution patterns and potential-tapping countermeasures in carbonate fracture-cavity reservoir[J]. Acta Petrolei Sinica, 2014, 35(6):1138-1146. doi:10.7623/syxb201406011
[4] 刘德华,陈利新,缪长生,等. 具有边底水碳酸盐岩油藏见水特征分析[J]. 石油天然气学报, 2008, 30(4):137-140. doi:10.3969/j.issn.1000-9752.2008.04.031 LIU Dehua, CHEN Lixin, MIAO Changsheng, et al. Analysis on water breakthrough in carbonate reservoirs with edge water and bottom water[J]. Journal of Oil and Gas Technology, 2008, 30(4):137-140. doi:10.3969/j.issn.1000-9752.2008.04.031
[5] 李阳. 塔河油田碳酸盐岩缝洞型油藏开发理论及方法[J]. 石油学报, 2013, 34(1):115-121. doi:10.7623/syxb201301013 LI Yang. The theory and method for development of carbonate fractured-cavity reservoirs in Tahe Oilfield[J]. Acta Petrolei Sinica, 2013, 34(1):115-121. doi:10.7623/syxb201301013
[6] 刘中春. 塔河油田缝洞型碳酸盐岩油藏提高采收率技术途径[J]. 油气地质与采收率, 2012, 19(6):66-68, 86. doi:10.3969/j.issn.1009-9603.2012.06.016 LIU Zhongchun. Enhanced oil recovery in Tahe karstic/fractured carbonate reservoir[J]. Petroleum Geology and Recovery Efficiency, 2012, 19(6):66-68, 86. doi:10.3969/j.issn.1009-9603.2012.06.016
[7] 郑松青,杨敏,康志江,等. 塔河油田缝洞型碳酸盐岩油藏水驱后剩余油分布主控因素与提高采收率途径[J]. 石油勘探与开发, 2019, 46(4):746-754. doi:10.11698/PED.2019.04.13 ZHENG Songqing, YANG Min, KANG Zhijiang, et al. Controlling factors of remaining oil distribution after water flooding and enhanced oil recovery methods for fracture-cavity reservoirs in Tahe Oilfield[J]. Petroleum Exploration and Development, 2019, 46(4):746-754. doi:10.11698/PED.2019.04.13
[8] 黄江涛,周洪涛,张莹,等. 塔河油田单井注氮气采油技术现场应用[J]. 石油钻采工艺, 2015, 37(3):103-105. doi:10.13639/j.odpt.2015.03.023 HUANG Jiangtao, ZHOU Hongtao, ZHANG Ying, et al. Field application of oil recovery technique by nitrogen injection in single-well in Tahe Oilfield[J]. Oil Drilling & Production Technology, 2015, 37(3):103-105. doi:10.13639/j.odpt.2015.03.023
[9] CUSSLER E L. Diffusion-mass transfer in fluid systems[M]. 3rd ed. Cambridge:Cambridge University Press, 2007. doi:10.1017/CBO9780511805134.001
[10] RONGY L, HAUGEN K B, FIROOZABADI A. Mixing from Fickian diffusion and natural convection in binary non-equilibrium fluid phases[J]. AIChE Journal, 2012, 58(5):1336-1345. doi:10.1002/aic.12685
[11] 汤勇,孙雷,周涌沂,等. 注气混相驱机理评价方法[J]. 新疆石油地质, 2004, 25(4):414-417. doi:10.3969/j.issn.1001-3873.2004.04.020 TANG Yong, SUN Lei, ZHOU Yongyi, et al. On evaluation method of miscible gas-flooding mechanism[J]. Xinjiang Petroleum Geology, 2004, 25(4):414-417. doi:10.3969/j.issn.1001-3873.2004.04.020
[12] 陈文,汤勇,梁涛,等. 超临界CO₂ 动态混相驱过程机理研究[J]. 钻采工艺, 2011, 34(3):77-80. doi:10.3969/J.ISSN.1006-768X.2011.03.23 CHEN Wen, TANG Yong, LIANG Tao, et al. Mechanism study of supercritical CO₂ sdynamic miscible flooding process[J]. Drilling & Production Technology, 2011, 34(3):77-80. doi:10.3969/J.ISSN.1006-768X.2011.03.23
[13] 李宾飞,叶金桥,李兆敏,等. 高温高压条件下CO₂ -原油水体系相间作用及其对界面张力的影响[J]. 石油学报, 2016, 37(10):1265-1272, 1301. doi:10.7623/syxb201610006 LI Binfei, YE Jinqiao, LI Zhaomin, et al. Phase interaction of CO₂-oil-water system and its effect on interfacial tension at high temperature and high pressure[J]. Acta Petrolei Sinica, 2016, 37(10):1265-1272, 1301. doi:10.7623/syxb201610006
[14] 王海涛,伦增珉,骆铭,等. 高温高压条件下CO₂/原油和N₂/原油的界面张力[J]. 石油学报, 2011, 32(1):177-180. WANG Haitao, LUN Zengmin, LUO Ming, et al. Interfacial tension of CO₂/crude oil and N₂/crude oil at high pressure and high temperature[J]. Acta Petrolei Sinica, 2011, 32(1):177-180.
[15] LASHKARBOLOOKI M, EFTEKHARI M J, NAJIMI S, et al. Minimum miscibility pressure of CO₂ and crude oil during CO₂ injection in the reservoir[J]. The Journal of Supercritical Fluids, 2017, 127:121-128. doi:10.1016/j.supflu.2017.04.005
[16] LI Songyan, QIAO Chenyu, ZHANG Chao, et al. Determination of diffusion coefficients of supercritical CO₂ under tight oil reservoir conditions with pressure-decay method[J]. Journal of CO₂ Utilization, 2018, 24:430-443. doi:10.1016/j.jcou.2018.02.002
[17] MOHAMMAD R R. A new method for experimental measurement of diffusion coefficients in reservoir fluids[J]. Journal of Petroleum Science and Engineering, 1996, 14(3-4):235-250. doi:10.1016/0920-4105(95)00035-6
[18] 郭平,汪周华,沈平平,等. 高温高压气体一原油分子扩散系数研究[J]. 西南石油大学学报(自然科学版), 2010, 32(1):73-79. doi:10.3863/j.issn.1674-5086.2010.01.013 GUO Ping, WANG Zhouhua, SHEN Pingping, et al. Molecular diffusion coefficient of gas-oil system under the condition of high temperature and pressure[J]. Journal of Southwest Petroleum University (Science & Technology Edition), 2010, 32(1):73-79. doi:10.3863/j.issn.1674-5086.2010.01.013
[19] 王志兴,侯吉瑞,李妍,等. 气体在原油中扩散系数影响因素研究进展[J]. 油田化学, 2019, 36(3):558-563. doi:10.19346/j.cnki.1000-4092.2019.03.032 WANG Zhixing, HOU Jirui, LI Yan, et al. Proceedings of influencing factors of gas diffusion coefficient in crude oil[J]. Oilfield Chemistry, 2019, 36(3):558-563. doi:10.19346/j.cnki.1000-4092.2019.03.032
[20] 孙扬,杜志敏,孙雷,等. 注CO₂ 前置段塞+N₂ 顶替提高采收率机理[J]. 西南石油大学学报(自然科学版), 2012, 34(3):89-97. doi:10.3863/j.issn.1674-5086.2012.03.013 SUN Yang, DU Zhimin, SUN Lei, et al. Mechanism research of enhancement oil recovery by CO₂ slugs pushed by N₂[J]. Journal of Southwest Petroleum University (Science & Technology Edition), 2012, 34(3):89-97. doi:10.3863/j.issn.1674-5086.2012.03.013
[21] 李士伦,孙雷,郭平,等. 再论我国发展注气提高采收率技术[J]. 天然气工业, 2006, 26(12):30-34. doi:10.3321/j.issn:1000-0976.2006.12.006 LI Shilun, SUN Lei, GUO Ping, et al. Re-discussion of EOR with gas injection in China[J]. Natural Gas Industry, 2006, 26(12):30-34. doi:10.3321/j.issn:1000-0976.2006.12.006
[22] 范智慧,邴绍献,聂法健,等. 已开发低渗油藏CO₂ 与N₂ 驱实验研究[J]. 中外能源, 2017, 22(5):55-60. FAN Zhihui, BING Shaoxian, NIE Fajian, et al. Study on the experimental of N₂ booster CO₂ flooding for developed low permeability oil reservoir[J]. Sino-global Energy, 2017, 22(5):55-60.
[23] 韩布兴,闰海科,胡日恒. CO₂、N₂ 在克拉玛依九区稠油中的溶解度及气体饱和稠油的粘度、密度[J]. 油田化学,1993,10(3):264-267. doi:10.19346/j.cnki.1000-4092.1993.03.017 HAN Buxing, YAN Haike, HU Riheng. Gas solubility, viscosity and density measurements for Karamay heavy crude saturated with carbon dioxide and nitrogen[J]. Oilfield Chemistry, 1993, 10(3):264-267. doi:10.19346/j.cnki.1000-4092.1993.03.017
[24] 杜林,秦晓渊,任雪霏. CO₂ 在饱和原油多孔介质中的扩散及影响因素[J]. 石油化工应用, 2019, 38(4):55-59. doi:10.3969/j.issn.1673-5285.2019.04.013 DU Lin, QIN Xiaoyuan, REN Xuefei. Research on the diffusion of CO₂ in porous media saturated by oil and the analysis of impact factors[J]. Petrochemical Industry Application, 2019, 38(4):55-59. doi:10.3969/j.issn.1673-5285.2019.04.013
[25] 毛毳,钟建华,李勇,等. 塔河油田奥陶系碳酸盐岩基质孔缝型储集体特征[J]. 石油勘探与开发, 2014, 41(6):681-689. doi:10.11698/PED.2014.06.05MAO Cui, ZHONG Jianhua, LI Yong, et al. Ordovician carbonate rock matrix fractured-porous reservoirs in Tahe Oilfield[J]. Petroleum Exploration and Development, 2014, 41(6):681-689. doi:10.11698/PED.2014.06.05
[26] 金强,康逊,田飞. 塔河油田奥陶系古岩溶径流带缝洞化学充填物成因和分布[J]. 石油学报, 2015, 36(7):791-798, 836. doi:10.7623/syxb201507003 JIN Qiang, KANG Xun, TIAN Fei. Genesis of chemical fillings in fracture-caves in paleo-karst runoff zone in Ordovician and their distributions in Tahe Oilfield, Tarim Basin[J]. Acta Petrolei Sinica, 2015, 36(7):791-798, 836. doi:10.7623/syxb201507003
[27] 李阳,范智慧. 塔河奥陶系碳酸盐岩油藏缝洞系统发育模式与分布规律[J]. 石油学报, 2011, 32(1):101-106. LI Yang, FAN Zhihui. Developmental pattern and distribution rule of the fracture-cavity system of Ordovician carbonate reservoirs in the Tahe Oilfield[J]. Acta Petrolei Sinica, 2011, 32(1):101-106.
[28] 金强,田飞,鲁新便,等. 塔河油田奥陶系古径流岩溶带垮塌充填特征[J]. 石油与天然气地质, 2015, 36(5):729-735, 755. doi:10.11743/ogg20150503 JIN Qiang, TIAN Fei, LU Xinbian, et al. Characteristics of collapse breccias in caves of runoff zone in the Ordovician karst in Tahe Oilfield, Tarim Basin[J]. Oil & Gas Geology, 2015, 36(5):729-735, 755. doi:10.11743/ogg20150503
[29] YU Boming, LI Jianhua, LI Zhihua, et al. Permeabilities of unsaturated fractal porous media[J]. International Journal of Multiphase Flow, 2003, 29(10):1625-1642. doi:10.1016/S0301-9322(03)00140-X
[30] 吴金随,胡德志,郭均中,等. 多孔介质中迂曲度和渗透率的关系[J]. 华北科技学院学报, 2016, 13(4):56-59. doi:10.3969/j.issn.1672-7169.2016.04.013 WU Jinsui, HU Dezhi, GUO Junzhong, et al. Study on the relationship between tortuosity and permeability in porous media[J]. Journal of North China Institute of Science and Technology, 2016, 13(4):56-59. doi:10.3969/j.issn.1672-7169.2016.04.013
[31] 李遵照,吴信荣,肖良,等. N₂ 在原油和地层水中的溶解机理研究[J]. 特种油气藏, 2013, 20(4):77-80. doi:10.3969/j.issn.1006-6535.2013.04.019 LI Zunzhao, WU Xinrong, XIAO Liang, et al. N₂ dissolution mechanism in crude oil and formation water[J]. Special Oil and Gas Reservoir, 2013, 20(4):77-80. doi:10.3969/j.issn.1006-6535.2013.04.019