延长油田CO_2驱过程中无机盐沉积规律
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摘要
CO_2驱替过程中,CO_2注入油藏后,极易与地层流体、岩石发生反应。而当地层压力、温度、地层水中离子质量浓度等改变时,溶液中无机盐可能沉淀析出,导致储层物性发生改变。储层物性的变化将直接影响到采收率的提高和CO_2地质封存的效果和规模。文中通过分析CO_2与CaCl_2溶液及地层水之间的相互作用发现,酸性条件下CO_2不会与CaCl_2溶液及地层水反应产生沉淀;通过模拟采出井附近降压过程发现,降压过程会导致沉积物析出,其中快速降压较缓慢降压过程沉积物析出更明显,高压条件下较低压条件下降压过程中沉积物析出更明显。
In the process of CO_2 flooding, CO_2 can react with formation fluid and rock when it is injected into the reservoir. With the change of pressure, temperature or ion concentration, inorganic salt can subside from the formation fluid. This results in the variations of reservoir properties and thus affect the efficiency of CO_2 flooding and sequestration. The interactions between CO_2 and Ca Cl2 solution, CO_2 and formation water were studied in this paper. The study shows that precipitation does not occur under acidic conditions. By simulating depressurization process near the production well, it is found that precipitation occurs in depressurization process. It appears more obvious in rapid depressurization process than in slow depressurization process and more obvious in high pressure than in low pressure.
In the process of CO_2 flooding, CO_2 can react with formation fluid and rock when it is injected into the reservoir. With the change of pressure, temperature or ion concentration, inorganic salt can subside from the formation fluid. This results in the variations of reservoir properties and thus affect the efficiency of CO_2 flooding and sequestration. The interactions between CO_2 and Ca Cl2 solution, CO_2 and formation water were studied in this paper. The study shows that precipitation does not occur under acidic conditions. By simulating depressurization process near the production well, it is found that precipitation occurs in depressurization process. It appears more obvious in rapid depressurization process than in slow depressurization process and more obvious in high pressure than in low pressure.
引文
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[3]江怀友,沈平平,李治平,等.世界二氧化碳埋存及利用方式研究[J].国际石油经济,2007(7):16-19.
[4]沈平平,江怀友,陈永武,等.CO2注入技术提高采收率研究[J].特种油气藏,2007,14(3):1-4,11.
[5]于淼,刘立,杨会东,等.CO2驱油后的矿物捕获:以松辽盆地南部为例[J].断块油气田,2015,22(1):102-107.
[6]钱伯章,朱建芳.世界封存CO2驱油的现状与前景[J].能源环境保护,2008,22(1):1-4.
[7]许志刚,陈代钊,曾荣树.CO2的地质埋存与资源化利用进展[J].地球科学进展,2007,22(7):698-707.
[8]王维波,陈龙龙,汤瑞佳,等.低渗透油藏周期注CO2驱油室内实验[J].断块油气田,2016,23(2):206-209.
[9]陈育红,潘卫东,孙双立.CO2吞吐对储层结垢趋势的影响研究[J].石油化工腐蚀与防护,2003,20(6):21-23.
[10]那金.CO2-EGS水-岩-气作用对地层孔渗特征的影响[D].长春:吉林大学,2013.
[11]王广华,赵静,张凤君,等.砂岩储层中CO2-地层水-岩石的相互作用[J].中南大学学报(自然科学版),2013,44(3):1167-1173.
[12]彭新晶,刘孟骐,夏祥斌,等.储层砂岩-盐水-超临界CO2体系相互作用[J].中国矿业大学学报,2013,42(2):302-307.
[13]周琳淞.CO2驱水-气-岩反应对疏松砂岩储层物性影响的研究[D].成都:西南石油大学,2013.
[14]朱子涵,李明远,林梅钦,等.储层中CO2-水-岩石相互作用研究进展[J].矿物岩石地球化学通报,2011,30(1):104-111.
[15]刘光启,马连湘,刘杰.化学化工物性数据手册[M].北京:化学工业出版社,2001:45-173.