特低渗油藏水驱后二氧化碳气水交替驱见效特征  

Response Characteristics of Gas-water Alternate Flooding with CO2 after Water Flooding in Ultra-low Permeability Reservoirs

作　　者：雷欣慧[1,2] 郑自刚[1,2] 余光明 张康[1,2] Lei Xinhui;Zheng Zigang;Yu Guangming;Zhang Kang(PetroChina Changqing Oilfield Company,Xi'an,Shaanxi 710018,China;Low-permeability Oil&Gas Exploration and Development of National Engineering Laboratory,Xi'an,Shaanxi 710018,China)

机构地区：[1]中国石油长庆油田分公司,陕西西安710018 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018

出　　处：《特种油气藏》2020年第5期113-117,共5页Special Oil & Gas Reservoirs

基　　金：中国石油重大科技专项“特/超低渗油藏CO 2驱油与埋存油藏工程技术方法研究”(2014E-3602);国家科技重大专项“大型油气田及煤层气开发”子课题“CO 2捕集、驱油与埋存技术示范工程”(2016ZX05056)。

摘　　要：为明确特低渗透油藏水驱后CO2气水交替驱见效特征,通过动静结合的方法,结合物理模拟实验获得的驱替动态数据和高温高压相态系统测定的CO2在油水中的溶解度静态数据,开展水驱后CO2气水交替驱动态特征研究。结果表明,CO2驱过程中适当增加气油比可产出溶解CO2的油气,在油藏条件下为单相油带,该阶段对驱油效果的贡献率为71.98%。建议油藏方案设计时可适当增大第1周期CO2段塞的尺寸,并选择在气窜临界点交替水驱,可有效提高CO2的利用率,并改善驱油效果。该研究结果对气水交替驱注入参数的优选具有一定的指导意义。In order to clarify the response characteristics of gas-water alternate flooding with CO 2 after water flooding in ultra-low permeability reservoirs,the research on dynamic characteristics of gas-water alternate flooding with CO2 was carried out.In the research,through the combination of dynamic and static methods,the dynamic data obtained by physical simulation experiments and the static data of CO2 solubility in oil-water solution measured in high-temperature and high-pressure phase system were used.The results show that appropriately increasing the gas-oil ratio during the CO2 flooding process can produce oil and gas to dissolve CO2,forming a single-phase oil zone under reservoir conditions,and the contribution rate of this stage to the oil displacement effect is 71.98%.It is suggested to appropriately increase the size of the CO2 slug in the first cycle when designing the reservoir plan,and to select the critical point of gas channeling to inject water,which can effectively increase the utilization rate of CO2 and improve the oil displacement effect.The research results have a certain guiding significance for the optimization of injection parameters for gas-water alternate flooding.

关 键 词：CO2驱 特低渗 气水交替 驱替特征赋存状态 相带分布 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]