红河致密砂岩油藏注CO_2可行性室内评价研究
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摘要
红河油田是典型的特低孔致密油藏,采用常规注水开发方式难以经济有效动用。采用室内物理模拟实验手段,从CO_2与储层和地层原油的配伍性、注入能力及储层注入界限等方面,探讨了红河油田注CO_2开发的可行性。实验结果表明,红河油田储层注CO_2流体不会产生堵塞,CO_2与储层原油配伍性较好;相同渗透率下,CO_2驱的注入指数为注水指数的8倍,且注CO_2驱是一个比较稳定的过程,注CO_2驱相对注N2驱来说,突破的时间较长,在较低渗透率的时候,没有出现较快突破的情况;结合非线性渗流、恒速压汞实验技术,发现当渗透率低于0.08 mD时,注CO_2的压力梯度呈明显升高的趋势,确定0.08 mD是注CO_2驱的储层渗透率下限。综合实验结果表明,红河致密油藏注CO_2驱开发在技术上是可行的。
Honghe oilfield is a typical ultra-low porosity and tight oil reservoir, and it is difficult to use conventional water injection development method economically and effectively. By using indoor physical simulation experiments, the feasibility of CO_2 flooding method in Honghe oilfield was explored from the aspects of compatibility of CO_2 with crude oil and reservoirs, formations injection capacity and reservoir injection limits. The results show that CO_2 fluids injection in the reservoirs of Honghe oilfield does not block and the compatibility of CO_2 with reservoir crude oil is good. Under the same permeability, the CO_2 flooding injection index is 8times of the water injection index, and the CO_2 injection is a relatively stable process. The breakthrough time of CO_2 injection is relatively longer than N2 injection. At the lower permeability stage, there is no rapid breakthrough; combined with non-linear percolation and constant-velocity mercury injection experiment technology, we find pressure gradient of CO_2 injection is obviously increased when the permeability is lower than 0.08 mD. It is determined that 0.08 mD is the lower limit of reservoir permeability for CO_2 injection. The comprehensive experimental results show that the development of CO_2 injection in the Honghe tight reservoir is technically feasible.
Honghe oilfield is a typical ultra-low porosity and tight oil reservoir, and it is difficult to use conventional water injection development method economically and effectively. By using indoor physical simulation experiments, the feasibility of CO_2 flooding method in Honghe oilfield was explored from the aspects of compatibility of CO_2 with crude oil and reservoirs, formations injection capacity and reservoir injection limits. The results show that CO_2 fluids injection in the reservoirs of Honghe oilfield does not block and the compatibility of CO_2 with reservoir crude oil is good. Under the same permeability, the CO_2 flooding injection index is 8times of the water injection index, and the CO_2 injection is a relatively stable process. The breakthrough time of CO_2 injection is relatively longer than N2 injection. At the lower permeability stage, there is no rapid breakthrough; combined with non-linear percolation and constant-velocity mercury injection experiment technology, we find pressure gradient of CO_2 injection is obviously increased when the permeability is lower than 0.08 mD. It is determined that 0.08 mD is the lower limit of reservoir permeability for CO_2 injection. The comprehensive experimental results show that the development of CO_2 injection in the Honghe tight reservoir is technically feasible.
引文
[1] Song C Y. Development of CO2EOR techniques for unlocking resources in tight oil formations[D].[s. n.]:Faculty of Graduate Studies and Research,University of Regina,2013.
[2]陈兴隆,秦积舜,张可. CO2与原油混相及非混相条件下渗流机理差异[J].特种油气藏,2009,16(3):77-81.Chen X L,Qin J S,Zhang K. Differences in percolation mechanism between CO2and crude oil in miscible and non-miscible phase[J]. Special Oil and Gas Reservoirs,2009,16(3):77-81.
[3]赵明国,李金珠,王忠滨.特低渗透油藏CO2非混相驱油机理研究[J].科学技术与工程,2011,11(7):1438-1440.Zhao M G,Li J Z,Wang Z B. Study on mechanism of CO2immiscible flooding in ultra-low permeability reservoir[J].Science Technology and Engineering,2011,11(7):1438-1440.
[4] Ali A,Farshid T. Oil recovery performance of immiscible and miscible CO2huff-and-puff processes[J]. Energy&Fuels,2014,28(2):774-784.
[5] Ren B,Zhang L,Huang H D,et al. Performance evaluation and mechanisms study of near-miscible CO2flooding in a tight oil reservoir of Jilin oilfield China[J]. Journal of Natural Gas Science and Engineering,2015,27:1796-1805.
[6]李孟涛,单文文,刘先贵,等.超临界氧化碳混相驱油机理实验研究[J].石油学报,2006,27(3):80-83.Li M T,Shan W W,Liu X G,et al. Experimental study on mechanism of supercritical carbon oxide miscible oil flooding[J].Acta Petrolei Sinica,2006,27(3):80-83.
[7]刘玉章,陈兴隆.低渗油藏CO2驱油混相条件的探讨[J].石油勘探与开发,2010(4):466-470.Liu Y Z,Chen X L. Miscible conditions of CO2flooding technology used in low permeability reserviors[J]. Petroleum Exploration and Development,2010(4):466-470.
[8]苏玉亮,吴晓东,侯艳红,等.低渗透油藏CO2混相驱油机制及影响因素[J].中国石油大学学报(自然科学版),2011,35(3):99-102.Su Y L,Wu X D,Hou Y H,et al. Mechanism of CO2miscible displacement in low permeability reservoir and influencing factor[J]. Journal of China University of Petroleum(Natural Science Edition),2011,35(3):99-102.
[9]王芳,罗辉,任玉飞,等.降低CO2驱混相压力的发展现状[J].石油化工高等学校学报,2015,28(6):93-97.Wang F,Luo H,Ren Y Y,etal. Progress of miscibility pressure reduction of carbon dioxide flooding[J]. Journal of Petrochemical Universities,2015,28(6):93-97.
[10]姚振杰,黄春霞,段景杰,等.延长油田CO2驱埋存潜力评价方法[J].辽宁石油化工大学学报,2016,36(3):43-45.Yao Z J,Huang C X,Duan J J,etal. CO2displacement geological storage potential evaluation of Yanchang oilfield[J].Journal of Liaoning Shihua University,2016,36(3):43-45.
[11]张硕.低渗透油藏CO2气驱渗流机理核磁共振研究[J].深圳大学学报(理工版),2009,26(3):228-233.Zhang S. Nuclear magnetic resonance study on percolation mechanism of CO2gas flooding in low permeability reservoirs[J]. Journal of Shenzhen University(Science and Engineering),2009,26(3):228-233.
[2]陈兴隆,秦积舜,张可. CO2与原油混相及非混相条件下渗流机理差异[J].特种油气藏,2009,16(3):77-81.Chen X L,Qin J S,Zhang K. Differences in percolation mechanism between CO2and crude oil in miscible and non-miscible phase[J]. Special Oil and Gas Reservoirs,2009,16(3):77-81.
[3]赵明国,李金珠,王忠滨.特低渗透油藏CO2非混相驱油机理研究[J].科学技术与工程,2011,11(7):1438-1440.Zhao M G,Li J Z,Wang Z B. Study on mechanism of CO2immiscible flooding in ultra-low permeability reservoir[J].Science Technology and Engineering,2011,11(7):1438-1440.
[4] Ali A,Farshid T. Oil recovery performance of immiscible and miscible CO2huff-and-puff processes[J]. Energy&Fuels,2014,28(2):774-784.
[5] Ren B,Zhang L,Huang H D,et al. Performance evaluation and mechanisms study of near-miscible CO2flooding in a tight oil reservoir of Jilin oilfield China[J]. Journal of Natural Gas Science and Engineering,2015,27:1796-1805.
[6]李孟涛,单文文,刘先贵,等.超临界氧化碳混相驱油机理实验研究[J].石油学报,2006,27(3):80-83.Li M T,Shan W W,Liu X G,et al. Experimental study on mechanism of supercritical carbon oxide miscible oil flooding[J].Acta Petrolei Sinica,2006,27(3):80-83.
[7]刘玉章,陈兴隆.低渗油藏CO2驱油混相条件的探讨[J].石油勘探与开发,2010(4):466-470.Liu Y Z,Chen X L. Miscible conditions of CO2flooding technology used in low permeability reserviors[J]. Petroleum Exploration and Development,2010(4):466-470.
[8]苏玉亮,吴晓东,侯艳红,等.低渗透油藏CO2混相驱油机制及影响因素[J].中国石油大学学报(自然科学版),2011,35(3):99-102.Su Y L,Wu X D,Hou Y H,et al. Mechanism of CO2miscible displacement in low permeability reservoir and influencing factor[J]. Journal of China University of Petroleum(Natural Science Edition),2011,35(3):99-102.
[9]王芳,罗辉,任玉飞,等.降低CO2驱混相压力的发展现状[J].石油化工高等学校学报,2015,28(6):93-97.Wang F,Luo H,Ren Y Y,etal. Progress of miscibility pressure reduction of carbon dioxide flooding[J]. Journal of Petrochemical Universities,2015,28(6):93-97.
[10]姚振杰,黄春霞,段景杰,等.延长油田CO2驱埋存潜力评价方法[J].辽宁石油化工大学学报,2016,36(3):43-45.Yao Z J,Huang C X,Duan J J,etal. CO2displacement geological storage potential evaluation of Yanchang oilfield[J].Journal of Liaoning Shihua University,2016,36(3):43-45.
[11]张硕.低渗透油藏CO2气驱渗流机理核磁共振研究[J].深圳大学学报(理工版),2009,26(3):228-233.Zhang S. Nuclear magnetic resonance study on percolation mechanism of CO2gas flooding in low permeability reservoirs[J]. Journal of Shenzhen University(Science and Engineering),2009,26(3):228-233.