BK气藏反凝析污染评价及解除方法实验
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摘要
凝析气藏反凝析污染严重影响气井产能,正确评价反凝析污染程度,寻找合适的解除反凝析污染方法,对提高凝析气藏采收率具有重要意义。根据石油天然气行业标准SY/T 5542—2009油气藏流体物性分析方法,以及BK气藏现场PVT资料,采用地面分离器气和分离器油配制了两种不同凝析油含量的凝析气样品,并在PVT仪中进行高压物性分析实验。分别将配置的两种不同凝析油含量的凝析气样进行气源与岩心联合衰竭模拟近井区凝析油污染,岩心单独衰竭模拟远井区凝析油污染,共进行了4组长岩心实验,通过测定气测渗透率定量比较了两种不同凝析气的反凝析污染程度,同时还开展了5组解除反凝析污染实验:注入0.1烃类孔隙体积(HCPV)干气、注0.05 HCPV甲醇+0.05 HCPV干气、注0.1HCPV氮气、提高温度15℃、提高温度30℃。实验结果显示:上述5种方案均在一定程度上缓解了反凝析污染,而对于BK凝析气藏而言,则推荐采用注干气和甲醇+注干气这两种方案来解除反凝析污染。
Retrograde condensation damage may significantly reduce condensate gas well productivity.Accurate evaluation of retrograde damage degree and proper methods to remove such damage may help enhance recovery rates of condensate gas reservoirs.According to SY/T5542-2009 "Test Method for Reservoir Fluid Physical Properties" and the field PVT data obtained in the Baka Gas Reservoir,Tuha Basin,the oil and gas obtained from the separator at ground were utilized to make two kinds of condensate gas samples with different condensate oil contents.The two samples were measured in a PVT analyzer to determine their physical properties under high pressures.Four groups of tests were performed on long cores to monitor the near and far wellbore depletion by different experimental methods,and then the condensation damage degree was compared quantitatively for the two different samples with different condensate oil contents.In addition,five experiments were conducted for the removal of contamination induced by retrograde condensation,through injecting 0.1 HCPV(Hydrocarbon Pore Volume) dry gas,0.05 HCPV dry gas+0.05 HCPV methanol,and0.1 HCPV nitrogen respectively,raising temperature by 15℃ and by 30℃.Research results show that the contamination induced by retrograde condensation can be removed to certain extent in all the above five tests.Therefore,for such condensate gas reservoir as the Baka Gas Reservoir,the two schemes of injecting dry gas and injecting methanol+dry gas are recommended to remove contamination induced by retrograde condensation.
Retrograde condensation damage may significantly reduce condensate gas well productivity.Accurate evaluation of retrograde damage degree and proper methods to remove such damage may help enhance recovery rates of condensate gas reservoirs.According to SY/T5542-2009 "Test Method for Reservoir Fluid Physical Properties" and the field PVT data obtained in the Baka Gas Reservoir,Tuha Basin,the oil and gas obtained from the separator at ground were utilized to make two kinds of condensate gas samples with different condensate oil contents.The two samples were measured in a PVT analyzer to determine their physical properties under high pressures.Four groups of tests were performed on long cores to monitor the near and far wellbore depletion by different experimental methods,and then the condensation damage degree was compared quantitatively for the two different samples with different condensate oil contents.In addition,five experiments were conducted for the removal of contamination induced by retrograde condensation,through injecting 0.1 HCPV(Hydrocarbon Pore Volume) dry gas,0.05 HCPV dry gas+0.05 HCPV methanol,and0.1 HCPV nitrogen respectively,raising temperature by 15℃ and by 30℃.Research results show that the contamination induced by retrograde condensation can be removed to certain extent in all the above five tests.Therefore,for such condensate gas reservoir as the Baka Gas Reservoir,the two schemes of injecting dry gas and injecting methanol+dry gas are recommended to remove contamination induced by retrograde condensation.
引文
[1]Hamoud AA,Gary AP,Mukul MS.Laboratory measurements of condensate blocking and treatment for both low and high permeability rocks[C]//paper 77546-MS presented at the SPE Annual Technical Conference and Exhibition.29 September-2October 2002,Texas,San Antonio,USA.
[2]Barnum RS,Brinkman FP,Richardson TW,Spillette AG.Gas condensate reservoir behavior productivity and recovery reduction due to condensation[C]//paper 30767-MS presented at the SPE Annual Technical Conference and Exhibition,22-25 October 1995,Dallas,Texas,USA.DOIshttp://dx.doi.org/10.2118/77546-MS.
[3]刘建仪,郭平.李士伦.宋文杰,江同文.反凝析污染对凝析气井伤害的实验评价研究[J].天然气工业,2001,21(5):67-70.Liu Jianyi,Guo Ping,Li Shilun,Song Wenjic.Jiang Tongwen.Condensate gas well damage caused by retrograde condensation contamination[J].Natural Gas Industry,2001,21(5):67-70.
[4]高奕奕.孙雷.张庆生.汤勇.陈宝金.王连习.等.低渗凝析气井反凝析、反渗吸伤害及解除方法[J].西南石油学院学报.2005.27(2):45-49.Gao Yiyi,Sun Lei,Zhang Qingsheng,Tang Yong.Chen Baojin.Wang Lianxi.et al.Low permeability condensate gas well,retrograde condensate,reverse imbibition damage and removing methods[J].Journal of Southwest Petroleum Institute,2005,27(2):45-49.
[5]姜贻伟,毕建霞,李闽.罗勇,邹建波.凝析气井反凝析污染对产能影响研究[J].西南行油学院学报,2005.27(6):46-48.Jiang Yiwei,Bi Jianxia,Li Min,Luo Yong,Zou Jianbo.Study of the effect of retrograde condensation pollution on the productivity of condensate gas well[J].Journal of Southwest Petroleum University,2005,27(6):46-48.
[6]严谨,张烈辉,王益维.凝析气井反凝析污染的评价及消除[J].天然气工业,2005.25(2):133-135.Yan Jin,Zhang Liehui,Wang Yiwei.Evaluation and elimination of condensate gas well damage caused by retrograde condensation contamination[J].Natural Gas Industry,2005,25(2):133-135.
[7]周小平,周丽梅.凝析气藏反凝析伤害研究[J].天然气技术.2007,1(3):19-24.Zhou Xiaoping,Zhou Limei.Study on retrograde condensate damage in gas condensate reservoir[J].Natural Gas Technology.2007,1(3):19-24.
[8]汤勇.杜志敏.孙雷.戚志林.李士伦.解除低渗凝析气井近井污染研究现状及进展[J].天然气工业.2007,27(6):88-91.Tang Yong,Du Zhimin,Sun Lei,Qi Zhilin,Li Shilun.Current status and future development of the study on removal of near-wellbore damage in low-permeability gas condensate wells[J].Natural Gas Industry,2007,27(6):88-91.
[9]戴岑璞,王自明.低渗透凝析气藏的反凝析特征[J].天然气工业,2007,27(11):79-81.Dai Cenpu,Wang Ziming.Retrograde condensation behaviors in low-permeability gas condensate reservoirs[J].Natural Gas Industry,2007,27(11):79-81.
[10]帅永乾.低渗凝析气田反凝析伤害评价及解除措施[J].吐哈油气,2007,12(4):346-351.Shuai Yongqian.Evaluation and removing methods on reverse condensate damage of low permeability condensate gas well[J].Tuha Oil&Gas,2007,12(4):346-351.
[11]肖丽仙,杜建芬,郭平,杨素云,曾珠.凝析气藏反凝析污染研究[J].断块油气田,2009,16(4):102-104.Xiao Lixian,Du Jianfen,Guo Ping,Yang Suyun,Zeng Zhu.Pollution caused by retrograde condensate in condensate gas reservoir[J].Fault-Block Oil&Gas Field,2009,16(4):102-104.
[12]高建军,韩继凡,郝巍,仓辉,徐建红.丘东气田反凝析污染评价及解除方法研究[J].特种油气藏,2010,17(2):85-88.Gao Jianjun,Han Jifan,Hao Wei,Cang Hui,Xu Jianhong.Study on evaluation and removal of retrograde condensate damage in Qiudong gas field[J].Special Oil and Gas Reservoirs,2010,17(2):85-88.
[13]潘毅,孙雷,李士伦,孙良田.张庆生.凝析气藏解除反凝析污染、提高气井产能方法[J].西南石油学院学报,2007,29(4):37-40.Pan Yi,Sun Lei,Li Shilun,Sun Liangtian,Zhang Qingsheng.The method solving condensate block and improving productivity of gas condensate reservoir[J].Journal of Southwest Petroleum University,2007,29(4):37-40.
[14]郭平,邓磊,杨学峰.唐明龙.肖香姣.吕江毅.低渗富含凝析油凝析气藏气井干气吞吐效果评价[J].石油勘探与开发.2010,37(3):354-357.Guo Ping,Deng Lei.Yang Xuefeng.Tang Minglong,Xiao Xiangjiao.Lil Jiangyi.Dry gas huff and puff effect evaluation of gas wells in low-permeable condensate gas reservoir with rich condensate oil[J].Petroleum Exploration and Development.2010.37(3):354-357.
[15]梁芹,高建军,温灵祥,乔向阳,杨春.丘东凝析气田反凝析污染评价[J].吐哈油气,2006,11(1):58-64.Liang Qin,Gao Jianjun,Wen Lingxiang,Qiao Xiangyang.Yang Chun.Retrograde condensation pollution evaluation for Qiudong condensate gas field[J].Tuha Oil&Gas.2006,11(1):58-64.
[16]李实。郑希潭.陈钢.罗凯.刘宁.凝析油地下反蒸发的实验研究[J].石油学报,2001,22(6):45-49.Li Shi,Zheng Xitan.Chen Gang,Luo Kai,Liu Ning.Experimental investigation of retrograde vaporization of oil condensate at subsurface conditions[J].Acta Petrolei Sinica,2001,22(6):45-49.
[17]郑希谭,孙雯悦,李实,陈钢,李军,洪颖.SY/T 5542—2009油气藏流体物性分析方法[S].北京:石油工业出版社,2010.Zheng Xitan.Sun Wenyue,Li Shi.Chen Gang,Li Jun,Hong Ying.SY/T 5542-2009 Test method for reservoir fluid physical properties[S].Beijing:Petroleum Industry Press,2010.
[2]Barnum RS,Brinkman FP,Richardson TW,Spillette AG.Gas condensate reservoir behavior productivity and recovery reduction due to condensation[C]//paper 30767-MS presented at the SPE Annual Technical Conference and Exhibition,22-25 October 1995,Dallas,Texas,USA.DOIshttp://dx.doi.org/10.2118/77546-MS.
[3]刘建仪,郭平.李士伦.宋文杰,江同文.反凝析污染对凝析气井伤害的实验评价研究[J].天然气工业,2001,21(5):67-70.Liu Jianyi,Guo Ping,Li Shilun,Song Wenjic.Jiang Tongwen.Condensate gas well damage caused by retrograde condensation contamination[J].Natural Gas Industry,2001,21(5):67-70.
[4]高奕奕.孙雷.张庆生.汤勇.陈宝金.王连习.等.低渗凝析气井反凝析、反渗吸伤害及解除方法[J].西南石油学院学报.2005.27(2):45-49.Gao Yiyi,Sun Lei,Zhang Qingsheng,Tang Yong.Chen Baojin.Wang Lianxi.et al.Low permeability condensate gas well,retrograde condensate,reverse imbibition damage and removing methods[J].Journal of Southwest Petroleum Institute,2005,27(2):45-49.
[5]姜贻伟,毕建霞,李闽.罗勇,邹建波.凝析气井反凝析污染对产能影响研究[J].西南行油学院学报,2005.27(6):46-48.Jiang Yiwei,Bi Jianxia,Li Min,Luo Yong,Zou Jianbo.Study of the effect of retrograde condensation pollution on the productivity of condensate gas well[J].Journal of Southwest Petroleum University,2005,27(6):46-48.
[6]严谨,张烈辉,王益维.凝析气井反凝析污染的评价及消除[J].天然气工业,2005.25(2):133-135.Yan Jin,Zhang Liehui,Wang Yiwei.Evaluation and elimination of condensate gas well damage caused by retrograde condensation contamination[J].Natural Gas Industry,2005,25(2):133-135.
[7]周小平,周丽梅.凝析气藏反凝析伤害研究[J].天然气技术.2007,1(3):19-24.Zhou Xiaoping,Zhou Limei.Study on retrograde condensate damage in gas condensate reservoir[J].Natural Gas Technology.2007,1(3):19-24.
[8]汤勇.杜志敏.孙雷.戚志林.李士伦.解除低渗凝析气井近井污染研究现状及进展[J].天然气工业.2007,27(6):88-91.Tang Yong,Du Zhimin,Sun Lei,Qi Zhilin,Li Shilun.Current status and future development of the study on removal of near-wellbore damage in low-permeability gas condensate wells[J].Natural Gas Industry,2007,27(6):88-91.
[9]戴岑璞,王自明.低渗透凝析气藏的反凝析特征[J].天然气工业,2007,27(11):79-81.Dai Cenpu,Wang Ziming.Retrograde condensation behaviors in low-permeability gas condensate reservoirs[J].Natural Gas Industry,2007,27(11):79-81.
[10]帅永乾.低渗凝析气田反凝析伤害评价及解除措施[J].吐哈油气,2007,12(4):346-351.Shuai Yongqian.Evaluation and removing methods on reverse condensate damage of low permeability condensate gas well[J].Tuha Oil&Gas,2007,12(4):346-351.
[11]肖丽仙,杜建芬,郭平,杨素云,曾珠.凝析气藏反凝析污染研究[J].断块油气田,2009,16(4):102-104.Xiao Lixian,Du Jianfen,Guo Ping,Yang Suyun,Zeng Zhu.Pollution caused by retrograde condensate in condensate gas reservoir[J].Fault-Block Oil&Gas Field,2009,16(4):102-104.
[12]高建军,韩继凡,郝巍,仓辉,徐建红.丘东气田反凝析污染评价及解除方法研究[J].特种油气藏,2010,17(2):85-88.Gao Jianjun,Han Jifan,Hao Wei,Cang Hui,Xu Jianhong.Study on evaluation and removal of retrograde condensate damage in Qiudong gas field[J].Special Oil and Gas Reservoirs,2010,17(2):85-88.
[13]潘毅,孙雷,李士伦,孙良田.张庆生.凝析气藏解除反凝析污染、提高气井产能方法[J].西南石油学院学报,2007,29(4):37-40.Pan Yi,Sun Lei,Li Shilun,Sun Liangtian,Zhang Qingsheng.The method solving condensate block and improving productivity of gas condensate reservoir[J].Journal of Southwest Petroleum University,2007,29(4):37-40.
[14]郭平,邓磊,杨学峰.唐明龙.肖香姣.吕江毅.低渗富含凝析油凝析气藏气井干气吞吐效果评价[J].石油勘探与开发.2010,37(3):354-357.Guo Ping,Deng Lei.Yang Xuefeng.Tang Minglong,Xiao Xiangjiao.Lil Jiangyi.Dry gas huff and puff effect evaluation of gas wells in low-permeable condensate gas reservoir with rich condensate oil[J].Petroleum Exploration and Development.2010.37(3):354-357.
[15]梁芹,高建军,温灵祥,乔向阳,杨春.丘东凝析气田反凝析污染评价[J].吐哈油气,2006,11(1):58-64.Liang Qin,Gao Jianjun,Wen Lingxiang,Qiao Xiangyang.Yang Chun.Retrograde condensation pollution evaluation for Qiudong condensate gas field[J].Tuha Oil&Gas.2006,11(1):58-64.
[16]李实。郑希潭.陈钢.罗凯.刘宁.凝析油地下反蒸发的实验研究[J].石油学报,2001,22(6):45-49.Li Shi,Zheng Xitan.Chen Gang,Luo Kai,Liu Ning.Experimental investigation of retrograde vaporization of oil condensate at subsurface conditions[J].Acta Petrolei Sinica,2001,22(6):45-49.
[17]郑希谭,孙雯悦,李实,陈钢,李军,洪颖.SY/T 5542—2009油气藏流体物性分析方法[S].北京:石油工业出版社,2010.Zheng Xitan.Sun Wenyue,Li Shi.Chen Gang,Li Jun,Hong Ying.SY/T 5542-2009 Test method for reservoir fluid physical properties[S].Beijing:Petroleum Industry Press,2010.