气藏型储气库注采全过程油气相行为模拟  

Simulation of petroleum phase behavior in injection and production process of underground gas storage in a gas reservoir

作　　者：王皆明[1,2] 石磊 张宇[3,4] 张可 李春[1,2] 陈显学 孙军昌[1,2] 邱小松[1,2] WANG Jieming;SHI Lei;ZHANG Yu;ZHANG Ke;LI Chun;CHEN Xianxue;SUN Junchang;QIU Xiaosong(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;Key Laboratory of Oil and Gas Underground Storage Project of China National Petroleum Corporation,Langfang 065007,China;China University of Petroleum,Beijing 102249,China;State Key Laboratory of Heavy Oil Processing,Beijing 102249,China;State Key Laboratory of Enhanced Oil Recovery,Beijing 100083,China;PetroChina Liaohe Oilfield Company,PetroChina,Panjin 124010,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油天然气集团有限公司油气地下储库工程重点实验室,河北廊坊065007 [3]中国石油大学(北京),北京102249 [4]重质油国家重点实验室,北京102249 [5]提高石油采收率国家重点实验室,北京100083 [6]中国石油辽河油田公司,辽宁盘锦124010

出　　处：《石油勘探与开发》2022年第6期1198-1205,1233,共9页Petroleum Exploration and Development

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“双6气顶油环储气库注采相平衡机理研究与应用”(kt2019-02-04);中国石油天然气股份有限公司科学研究与技术开发项目“深层/超深层油气藏开发技术研究”(2021DJ1001)。

摘　　要：在分析气藏向储气库转化过程中流体相行为的基础上,建立了描述储气库注采全过程油气相行为特征的数学模型和模拟方法,并以辽河双6带油环气藏型储气库为典型实例,模拟验证了数学模型的可靠性和精度,揭示了流体相行为特征与作用机理。研究表明:注气形成库容阶段,油气相行为表现为气顶气对油环油以蒸发抽提为主、溶解扩散作用为辅,气顶气轻质组分含量升高,中间和重质组分含量降低,密度、黏度增大;油环油重质组分含量降低,轻质、中间组分含量升高,密度、黏度减小,体积系数、溶解油气比增大。储气库周期注采稳定运行阶段,油气相行为表现为气顶气对油环油的蒸发抽提能力逐渐减弱,而溶解扩散作用逐渐增强,气顶气中间组分含量缓慢降低,轻质组分含量缓慢上升,气顶气逐步轻质化,但对密度、黏度影响较小;油环油重质组分含量增大,中间组分含量降低,密度、黏度升高,体积系数、溶解油气比减小。On the basis of analyzing the fluid phase behavior during the transformation from gas reservoir to gas storage,a mathematical model and an experimental simulation method are established to describe the oil-gas phase behavior during the whole injection-production process of gas storage.The underground gas storage in the Liaohe Shuang 6 gas reservoir with oil ring is taken as a typical example to verify the reliability and accuracy of the mathematical model and reveal characteristics and mechanisms of fluid phase behavior.In the gas injection stage of the gas storage,the phase behavior is characterized by mainly evaporation and extraction and secondarily dissolution and diffusion of gas in the cap to oil in the oil ring of the reservoir;the gas in gas cap increases in light component content,decreases in contents of intermediate and heavy components,and increases in density and viscosity.The oil of the ring decreases in content of heavy components,increases in contents of light and intermediate components,decreases in density and viscosity,and increases in volume factor and solution gas oil ratio.In the stable operation stage of periodic injection-production of gas storage,the phase behavior shows that the evaporation and extraction capacity of injection gas in the cap to oil rim is weakened step by step,the phase behavior gradually changes into dissolution and diffusion.The gas in gas cap decreases in content of intermediate components,increases in content of light components slowly,and becomes lighter;but changes hardly in density and viscosity.The oil in the oil ring increases in content of heavy components,decreases in content of intermediate components,rises in density and viscosity,and drops in volume factor and solution gas oil ratio.

关 键 词：气藏型储气库 油气相行为特征 数学模型 实验模拟 作用机理 

分 类 号：TE972[石油与天然气工程—石油机械设备]