深层缝洞型油藏烃气混相驱可行性及影响因素

doi:10.7657/XJPG20210610

摘要/Abstract

摘要：

针对塔河油田深层缝洞型油藏,基于室内相态实验,采用经验公式法、拟三元相图法和细管模拟法计算烃气与原油最小混相压力,并通过数值模拟,研究了油藏前期注入氮气和原油品质对烃气混相驱的影响。研究结果表明：3种方法计算得到的原油最小混相压力远小于地层实际平均压力,研究区深层缝洞型油藏烃气混相驱具有较好的可行性;油藏前期注入氮气对烃气混相驱影响显著,注入氮气波及的储集层区域,烃气与原油的最小混相压力变高,氮气含量与注入烃气含量比大于1.208时,无法形成混相;原油品质对烃气混相驱影响显著,原油中的轻组分含量越高,烃气与原油最小混相压力越低,原油中的重组分含量越高,烃气混相驱最终采收率越低。

关键词: 塔里木盆地, 塔河油田, 深层缝洞型油藏, 烃气混相驱, 最小混相压力, 细管实验, 可行性

Abstract:

In order to investigate the deep fractured-vuggy reservoir in Tahe oilfield, the minimum miscible pressure of hydrocarbon gas-crude oil system is calculated through indoor phase behavior experiments and using empirical formula method, pseudo-ternary phase diagram method and slim tube simulation method, and the influences of early nitrogen injection and crude oil quality on hydrocarbon gas miscible flooding are studied through numerical simulation. The research results show that the minimum miscible pressure calculated by the three methods is much lower than the average actual reservoir pressure, so hydrocarbon gas-crude oil miscible flooding is very feasible for the deep fractured-vuggy reservoir in the study area; and early nitrogen injection impacts the miscible flooding significantly. In the reservoir swept by injected nitrogen, the minimum hydrocarbon gas-crude oil miscible pressure becomes higher. In the reservoir where the ratio of nitrogen to hydrocarbon gas is greater than 1.208, a miscible phase wouldn’t appear. Crude oil quality also has a great impact on hydrocarbon gas-crude oil miscible flooding. The more the light components in crude oil, the lower the minimum miscible pressure of hydrocarbon gas and crude oil, and the more the heavy components in crude oil, the lower the ultimate recovery rate of the miscible flooding.

Key words: Tarim basin, Tahe oilfield, deep fractured-vuggy reservoir, hydrocarbon gas-crude oil miscible flooding, minimum miscible pressure, slim tube experiment, feasibility

中图分类号:

TE344

李吉康, 孙致学, 谭涛, 郭臣, 谢爽, 郝聪. 深层缝洞型油藏烃气混相驱可行性及影响因素[J]. 新疆石油地质, 2021, 42(6): 714-719.

LI Jikang, SUN Zhixue, TAN Tao, GUO Chen, XIE Shuang, HAO Cong. Feasibility and Influencing Factors of Miscible Hydrocarbon Gas Flooding for Deep Fractured-Vuggy Reservoirs[J]. Xinjiang Petroleum Geology, 2021, 42(6): 714-719.

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参考文献 17

[1]	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.
	LIU Zhongchun. Technical approaches for enhanced oil recovery in fractured-cavity carbonate reservoirs in Tahe oilfield[J]. Petroleum Geology and Recovery Efficiency, 2012, 19(6):66-68.
[2]	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):1 138-1 146.
	RONG Yuanshuai, ZHAO Jinzhou, LU Xinbian, et al. Remaining oil distribution patterns and potential tapping strategies of carbonate fracture-cavity reservoirs[J]. Acta Petrolei Sinica, 2014, 35(6):1 138-1 146.
[3]	鲁新便, 蔡忠贤. 缝洞型碳酸盐岩油藏古溶洞系统与油气开发:以塔河碳酸盐岩溶洞型油藏为例[J]. 石油与天然气地质, 2010, 31(1):22-27.
	LU Xinbian, CAI Zhongxian. Fracture-cavity carbonate reservoir ancient karst cave system and oil and gas development:taking Tahe carbonate cavern reservoir as an example[J]. Oil & Gas Geology, 2010, 31(1):22-27.
[4]	XIAO Yang, ZHANG Ziwei, JIANG Tongwen, et al. Dynamic and static combination method for fracture-vug unit division of fractured-vuggy reservoirs[J]. Arabian Journal for Science & Engineering, 2017, 43(6):1-8.
[5]	QU Ming, HOU Jirui, QI Pengpeng, et al. Experimental study of fluid behaviors from water and nitrogen floods on a 3D visual fractured-vuggy model[J]. Journal of Petroleum Science and Engineering, 2018, 166:871-879. doi: 10.1016/j.petrol.2018.03.007
[6]	邓兴梁, 罗新生, 刘永福, 等. 缝洞型碳酸盐岩定容油藏形成机理及开发技术[J]. 新疆石油地质, 2019, 40(1):79-83.
	DENG Xingliang, LUO Xinsheng, LIU Yongfu, et al. Forming mechanism and development measures of constant-volume fractured-vuggy carbonate oil reservoirs[J]. Xinjiang Petroleum Geology, 2019, 40(1):79-83.
[7]	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.
	HUI Jian, LIU Xueli, WANG Yang, et al. Oil recovery mechanism and practice of single well nitrogen injection in fractured-cavity reservoirs in Tahe oilfield[J]. Xinjiang Petroleum Geology, 2015, 36(1):75-77.
[8]	解慧, 李璐, 杨占红, 等. 塔河油田缝洞型油藏单井注氮气影响因素研究[J]. 石油地质与工程, 2015, 29(4):134-135.
	XIE Hui, LI Lu, YANG Zhanhong, et al. Research on the influence factors of single well nitrogen injection in fractured-cavity reservoirs in Tahe oilfield[J]. Petroleum Geology and Engineering, 2015, 29(4):134-135.
[9]	王建海, 李娣, 曾文广, 等. 塔河缝洞型油藏氮气+二氧化碳吞吐先导试验[J]. 大庆石油地质与开发, 2015, 34(6):110-113.
	WANG Jianhai, LI Di, ZENG Wenguang, et al. Pilot test of N₂ & CO₂ huff and puff in Tahe fractured-vuggy reservoirs[J]. Daqing Petroleum Geology and Development, 2015, 34(6):110-113.
[10]	朱桂良. 塔河油田断溶体油藏气驱井组注气量计算方法[J]. 新疆石油地质, 2020, 41(2):248-252.
	ZHU Guiliang. A method to calculate gas injection volume in fault-karst carbonate reservoirs of Tahe oilfield[J]. Xinjiang Petroleum Geology, 2020, 41(2):248-252.
[11]	郑泽宇, 朱倘仟, 侯吉瑞, 等. 碳酸盐岩缝洞型油藏注氮气驱后剩余油可视化研究[J]. 油气地质与采收率, 2016, 23(2):93-97.
	ZHENG Zeyu, ZHU Tangqian, HOU Jirui, et al. Visualization of remaining oil after nitrogen flooding in carbonate fracture-cavity reservoirs[J]. Petroleum Geology and Recovery Efficiency, 2016, 23(2):93-97.
[12]	TEKLU T W, GHEDAN S G, GRAVES R M, et al. Minimum miscibility pressure determination:modified multiple mixing cell method[R]. SPE 155454, 2012.
[13]	杨铁军, 张英芝, 杨正明, 等. 致密砂岩油藏CO₂驱油提高采收率机理[J]. 科学技术与工程, 2019, 19(24):113-118.
	YANG Tiejun, ZHANG Yingzhi, YANG Zhengming, et al. CO₂ flooding enhanced oil recovery mechanism in tight sandstone reservoirs[J]. Science Technology and Engineering, 2019, 19(24):113-118.
[14]	DAWOUD A M, EI MAHDI A, BIDINGER C, et al. Early miscible hydrocarbon gas injection in Abu Dhabi heterogeneous carbonate reservoir[R]. SPE 129238, 2010.
[15]	PENG Dingyu, ROBINSON D B. A new two-constant equation of state[J]. Industrial and Engineering Chemistry Research, 1976, 15(1):59-64.
[16]	侯大力, 罗平亚, 孙雷, 等. 预测烃类气体-原油体系最小混相压力的改进模型[J]. 新疆石油地质, 2013, 34(6):684-688.
	HOU Dali, LUO Pingya, SUN Lei, et al. Improved model for predicting the minimum miscible pressure of hydrocarbon gas-crude oil system[J]. Xinjiang Petroleum Geology, 2013, 34(6):684-688.
[17]	胡蓉蓉, 姚军, 孙致学, 等. 塔河油田缝洞型碳酸盐岩油藏注气驱油提高采收率机理研究[J]. 西安石油大学学报(自然科学版), 2015, 30(2):49-53.
	HU Rongrong, YAO Jun, SUN Zhixue, et al. Study on the mechanism of enhanced oil recovery by gas injection in fractured-cavity carbonate reservoirs in Tahe oilfield[J]. Journal of Xi’an Shiyou University (Natural Science Edition), 2015, 30(2):49-53.