低含凝析油低渗凝析气藏凝析油污染评价及解除方法实验
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摘要
传统观点认为,低含凝析油凝析气藏对储层污染很小,即使渗透率低也影响不大,因此研究较少。针对低含凝析油的低渗透凝析气藏特点,建立了近井区凝析油污染评价方法,采用0. 086 2、0. 009 19 m D两种不同渗透率的孔隙型储层岩心,分别结合凝析油含量为25. 32、52. 59 g/m3的两种低含凝析油的凝析气样品,通过测试不同衰竭压力下气相有效渗透率的变化,来评价凝析气藏近井区凝析油污染程度,并反推污染程度最大的岩心对应的凝析油饱和度,然后选择上述污染程度较大的0. 009 19 m D岩心,采用分别注入0. 1干气,以及0. 05 HCPV干气+0. 05 HCPV甲醇的方法进行凝析油污染解除对比实验,结果表明:注干气岩心渗透率恢复程度达到39. 42%,注干气+甲醇岩心渗透率恢复程度可达50. 46%。该研究为低渗透凝析气藏凝析油污染程度评价及解除提供了一种新方法。
In traditional opinion,condensate gas reservoirs with low condensate oil have little contamination to the reservoir,even if the permeability is low,so there is few research. According to the characteristics of low permeability condensate gas reservoirs with low condensate oil,the evaluation method of condensate oil pollution near wellbore is established. The core of porous reservoirs with 0. 086 2 m D and 0. 009 19 m D permeability was used to test the different depletion pressures of condensate gas samples with condensate oil of 25. 32 g/m3 and 52. 59 g/m3 respectively. The change of gas effective permeability under different depletion pressure was used to evaluate the pollution degree of condensate oil near wellbore,and deduced the condensate saturation corresponding to the most polluted core. Then the 0. 009 19 m D core with higher pollution degree was selected to inject 0. 1 HCPV dry gas and 0. 05 HCPV dry gas + 0. 05 HCPV methanol into the condensate gas reservoir. The recovery degree of core permeability with dry gas is 39. 42%,and the recovery rate of core permeability with dry gas + methanol can reach50. 46%. A new method for evaluating and relieving condensate oil contamination in low permeability condensate gas reservoirs was provided.
In traditional opinion,condensate gas reservoirs with low condensate oil have little contamination to the reservoir,even if the permeability is low,so there is few research. According to the characteristics of low permeability condensate gas reservoirs with low condensate oil,the evaluation method of condensate oil pollution near wellbore is established. The core of porous reservoirs with 0. 086 2 m D and 0. 009 19 m D permeability was used to test the different depletion pressures of condensate gas samples with condensate oil of 25. 32 g/m3 and 52. 59 g/m3 respectively. The change of gas effective permeability under different depletion pressure was used to evaluate the pollution degree of condensate oil near wellbore,and deduced the condensate saturation corresponding to the most polluted core. Then the 0. 009 19 m D core with higher pollution degree was selected to inject 0. 1 HCPV dry gas and 0. 05 HCPV dry gas + 0. 05 HCPV methanol into the condensate gas reservoir. The recovery degree of core permeability with dry gas is 39. 42%,and the recovery rate of core permeability with dry gas + methanol can reach50. 46%. A new method for evaluating and relieving condensate oil contamination in low permeability condensate gas reservoirs was provided.
引文
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14 赵梓寒.丘东凝析气藏注气提高采收率数值模拟研究[D].成都:西南石油大学,2015Zhao Zihan. Numerical simulation of gas injection to enhance recovery in qidong condensate gas reservoir[D]. Chengdu:Southwest Petroleum University,2015
15 中国石油勘探开发研究院.油气藏流体物性分析方法:GB/T26981—2011[S].北京:中国标准出版社,2012Petro China Exploration and Development Research Institute. Test method for reservoir fluid physical properties:GB/T 26981—2011[S]. Beijing:Standards Press of China,2012
16 中国石化胜利油田分公司提高采收率研究院.岩心分析方法:GB/T 29172—2012[S].北京:中国标准出版社,2013Enhanced Oil Recovery Research Institute of Shengli Oilfield,Sinopec. Practices for core analysis:GB/T 29172—2012[S]. Beijing:Standards Press of China,2013
17 汪周华,涂汉敏,郭平,等.衰竭式开发砂岩凝析气藏储层中反凝析油饱和度确定方法:201610006465. 7[P]. 2018-02-16Wang Zhouhua,Tu Hanmin,Guo Ping,et al. Determination method of condensate oil saturation in sandstone condensate gas reservoirs with depletion development:201610006465. 7[P]. 2018-02-16
18 中国石油勘探开发研究院.岩石中两相流体相对渗透率测定方法:SY/T 5345—2007[S].北京:中国标准出版社,2008Petro China Exploration and Development Research Institute. Test method for two phase relative permeability in rock:SY/T 5345—2007[S]. Beijing:Standards Press of China,2008
2 Du L G,Jacob G,Gary A,et al. Use of solvents to improve the productivity of gas condensate wells[C]//The 2000 SPE Annual Technical Conference and Exhibition. Richardson:SPE,2012:62935
3 Mott R,Cable A,Spearing M. Measurements of relative permeabilities for calculating gas-condensate well deliverability[J]. SPE Reservoir Evaluation&Engineering,2000,3(6):473-479
4 肖翠. BK致密气藏凝析油污染评价及解除方法研究[D].成都:西南石油大学,2015Xiao Cui. Study on pollution evaluation and removal method of condensate oil in BK tight gas reservoir[D]. Chengdu:Southwest Petroleum University,2015
5 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):133-135Yan 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
6 郭平,刘宇,杜建芬,等.苏里格气田取样代表性及凝析油污染[J].科学技术与工程,2018,18(26):103-107Guo Ping,Liu Yu,Du Jianfen,et al. Sampling representative and condensate oil pollution in Sulige gas field[J]. Science Technology and Engineering,2018,18(26):103-107
7 郭平,邓磊,杨学峰,等.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):354-357Guo Ping,Deng Lei,Yang Xuefeng,et al. 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
8 杜建芬,肖翠,汪周华,等. BK气藏反凝析污染评价及解除方法实验[J].天然气工业,2015,35(4):52-46Du Jianfen,Xiao Cui,Wang Zhouhua,et al. Laboratory study on the evaluation and removal of retrograde condensate damage in the BK gas reservoir[J]. Natural Gas Industry,2015,35(4):52-46
9 肖丽仙,杜建芬,郭平,等.凝析气藏反凝析污染研究[J].断块油气田,2009,16(4):102-104Xiao Lixian,Du Jianfen,Guo Ping,et al. Pollution caused by retrograde condensate in condensate gas reservoir[J]. Fault-Block Oil&Gas Field,2009,16(4):102-104
10 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):79-81Dai Cenpu,Wang Ziming. Retrograde condensation behaviors in low-permeability gas condensate reservoirs[J]. Natural Gas Industry,2007,27(11):79-81
11 汤勇,杜志敏,孙雷,等.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):88-91Tang Yong,Du Zhimin,Sun Lei,et al. Current status and future development of the study on removal of near-wellbore damage in lowpermeability gas condensate wells[J]. Natural Gas Industry,2007,27(6):88-91
12 苏英杰,王健伟.定容凝析气藏单井凝析油污染程度判别[J].中国海上油气,2015,27(2):58-62Su Yingjie,Wang Jianwei. Identification of condensate damage degree of a well in constant volume gas condensate reservoirs[J]. China Offshore Oil and Gas,2015,27(2):58-62
13 孙志道,胡永乐,李云鹃,等.凝析气藏早期开发气藏工程研究[M].北京:石油工业出版社,2003:198-210Sun Zhidao,Hu Yongle,Li Yunjuan,et al. Gas reservoir engineering study of prophase condensate reservoir development[M]. Beijing:Petroleum Industry Press,2003:198-210
14 赵梓寒.丘东凝析气藏注气提高采收率数值模拟研究[D].成都:西南石油大学,2015Zhao Zihan. Numerical simulation of gas injection to enhance recovery in qidong condensate gas reservoir[D]. Chengdu:Southwest Petroleum University,2015
15 中国石油勘探开发研究院.油气藏流体物性分析方法:GB/T26981—2011[S].北京:中国标准出版社,2012Petro China Exploration and Development Research Institute. Test method for reservoir fluid physical properties:GB/T 26981—2011[S]. Beijing:Standards Press of China,2012
16 中国石化胜利油田分公司提高采收率研究院.岩心分析方法:GB/T 29172—2012[S].北京:中国标准出版社,2013Enhanced Oil Recovery Research Institute of Shengli Oilfield,Sinopec. Practices for core analysis:GB/T 29172—2012[S]. Beijing:Standards Press of China,2013
17 汪周华,涂汉敏,郭平,等.衰竭式开发砂岩凝析气藏储层中反凝析油饱和度确定方法:201610006465. 7[P]. 2018-02-16Wang Zhouhua,Tu Hanmin,Guo Ping,et al. Determination method of condensate oil saturation in sandstone condensate gas reservoirs with depletion development:201610006465. 7[P]. 2018-02-16
18 中国石油勘探开发研究院.岩石中两相流体相对渗透率测定方法:SY/T 5345—2007[S].北京:中国标准出版社,2008Petro China Exploration and Development Research Institute. Test method for two phase relative permeability in rock:SY/T 5345—2007[S]. Beijing:Standards Press of China,2008