挥发性油藏酸气回注的最小混相压力与组分优化
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摘要
高含H_2S和CO_2酸性气体的低渗透挥发性油藏在开发过程中,H_2S和CO_2会以溶解气的形式被采出,并占有较高的摩尔分数。分离器条件下的气态轻烃通过回注地层,在油藏压力高于最小混相压力(MMP)时达到混相驱动,一方面可以显著提高驱油效率,另一方面可以起到减缓压力衰竭的目的。H_2S和CO_2作为污染气体,分离和回收成本较高;而与烃气一同回注地层势必会对MMP产生影响。因此,需要研究酸性气体对溶解气回注MMP的影响规律并且合理地优化回注气组分。在对目标区块原油组分拟合重组的基础上,通过混合单元格法预测MMP,研究了溶解气主要组分的混相能力以及H_2S和CO_2对烃气驱MMP的影响规律,通过正交试验方法优化了注入气比例。结果表明:作为酸性杂质气体H_2S和CO_2具有较强的混相能力,可以降低注气MMP;最优注气形式为溶解气直接回注地层。
Sour gas can be produced in solution gas with high percentage in the development of low permeable carbonate reservoir with rich H_2 S and CO_2 dissolved in volatile oil. The hydrocarbon gas in separator condition injected into reservoir will become miscible with oil when formation pressure above MMP,which can greatly improve displacement efficiency and reduce the pressure depletion. On one hand,as pollution gases,H_2 S and CO_2 separation and processing cost much; on the other hand,the reinjection with hydrocarbon gas will influence MMP. Therefore,the study of the influence of sour gas on MMP and the composition optimization for reinjection are significant.The miscibility of main compositions in solution gas and the influence of H_2 S and CO_2 on MMP are firstly studied by using multiple mixing grid method on the basis of regress and recombination for compositions,then the components of injected gas are optimized through orthogonal design. The results indicate that H_2 S and CO_2 as sour gases have strong miscibility which can help decrease MMP; reinjection with the entire solution gas is the optimal project.
Sour gas can be produced in solution gas with high percentage in the development of low permeable carbonate reservoir with rich H_2 S and CO_2 dissolved in volatile oil. The hydrocarbon gas in separator condition injected into reservoir will become miscible with oil when formation pressure above MMP,which can greatly improve displacement efficiency and reduce the pressure depletion. On one hand,as pollution gases,H_2 S and CO_2 separation and processing cost much; on the other hand,the reinjection with hydrocarbon gas will influence MMP. Therefore,the study of the influence of sour gas on MMP and the composition optimization for reinjection are significant.The miscibility of main compositions in solution gas and the influence of H_2 S and CO_2 on MMP are firstly studied by using multiple mixing grid method on the basis of regress and recombination for compositions,then the components of injected gas are optimized through orthogonal design. The results indicate that H_2 S and CO_2 as sour gases have strong miscibility which can help decrease MMP; reinjection with the entire solution gas is the optimal project.
引文
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9 鞠斌山,秦积舜,李治平,等.二氧化碳-原油体系最小混相压力预测模型.石油学报,2012;33(2):274—277Ju Binshan,Qin Jishun,Li Zhiping,et al.A prediction model for the minimum miscibility pressure of the CO2—crude oil system.Acta Petrolei Sinica,2012;33(2):274—277
10 Kaveh Ahmadi,Russell T.Johns.Multiple-mixing-cell method for MMP calculations.SPE Journal,2011;16(4):733—742
2 张玲,候庆宇,庄丽,等.储量估算方法在缝洞型碳酸盐岩油藏的应用.油气地质与采收率,2012;19(1):24—27Zhang Ling,Hou Qingyu,Zhuang Li,et al.Application of reserves estimation methods to fractured—vuggy carbonate reservoir.PGRE,2012;19(1):24—27
3 何海清,李建忠.中国石油“十一五”以来油气勘探成果、地质新认识与技术进展.中国石油勘探,2014;19(6):1—11He Haiqing,Li Jianzhong.Petro China’s oil and gas exploration results,new geological theories and technological achievements since11 th five-year plan period.China Petroleum Exploration,2014;19(6):1—11
4 赵伦,范子菲,宋珩,等.提高低渗碳酸盐岩储集层动用程度技术.石油勘探与开发,2009;36(4):508—512Zhao Lun,Fan Zifei,Song Heng,et al.Technologies for improving producing degree of low permeability carbonate reservoirs.Petroleum Exploration and Development,2009;36(4):508—512
5 刘维霞,田选华,杨勇,等.低渗透油藏地层压力保持水平对驱油效率的影响.科学技术与工程,2015;15(19):115—120Liu Weixia,Tian Xuanhua,Yang Yong,et al.The impact of formation pressure maintenance on displacement efficiency in low permeability reservoirs.Science Technology and Engineering,2015;15(19):115—120
6 李士伦,张正卿,冉新权.注气提高石油采收率技术.成都:四川科学技术出版社,2001Li Shilun,Zhang Zhengqing,Ran Xinquan.Gas injection enhanced oil recovery technology.Chengdu:Sichuan Science and Technology Press,2001
7 陈晓军,史华,成伟,等.扎尔则油田注烃气混相驱机理研究.油气地质与采收率,2012;19(3):74—77Chen Xiaojun,Shi Hua,Cheng Wei,et al.Mechanism study on hydrocarbon gas miscible flooding in Zarzaitine oilfield.PGRE,2012;19 (3):74—77
8 敖文君,赵仁保,杨晓盈,等.轻质油藏注富气驱提高采收率室内研究.石油天然气学报,2014;36(9):163—170Ao Wenjun,Zhao Renbao,Yang Xiaoying,et al.Laboratory study on enhanced oil recovery by enriched gas flooding in light oil reservoirs.Journal of Oil and Gas Technology,2014;36(9):163—170
9 鞠斌山,秦积舜,李治平,等.二氧化碳-原油体系最小混相压力预测模型.石油学报,2012;33(2):274—277Ju Binshan,Qin Jishun,Li Zhiping,et al.A prediction model for the minimum miscibility pressure of the CO2—crude oil system.Acta Petrolei Sinica,2012;33(2):274—277
10 Kaveh Ahmadi,Russell T.Johns.Multiple-mixing-cell method for MMP calculations.SPE Journal,2011;16(4):733—742