摘要
低渗透油藏已成为中国油气开发的重要领域,开展CO_(2)驱可实现提高采收率和CO_(2)地质封存的双重目的,但不同的注入方式对其适应性存在差异。以某低渗透油藏典型物性和流体参数为例,利用数值模拟手段论证了CO_(2)连续注入(CGI)、水气交替注入-气水段塞比恒定(CWAG)和水气交替注入-气水段塞比逐渐减小(TWAG)3种不同注入方式对提高采收率和地质封存的适应性。研究结果表明,3种注入方式对于渗透率为1 mD的储层累积产油量和CO_(2)埋存量最高,采用生产气油比约束的工作制度更有利于CO_(2)驱提高采收率或地质封存。CGI注入方式在生产气油比界限为0.4倍的最大生产气油比约束下生产,更适合CO_(2)地质封存项目,CWAG注入方式在生产气油比界限为0.2倍的最大生产气油比约束下生产,更适合CO_(2)驱提高采收率和地质封存相结合的项目,而TWAG注入方式在生产气油比界限为0.6倍的最大生产气油比约束下生产,更适合CO_(2)驱提高采收率项目。
The development of low permeability reservoirs has become an important field of oil and gas development in China.CO_(2) flooding in such reservoirs can achieve the dual purposes of enhanced oil recovery and CO_(2) geological storage,but the adaptability varies with injection methods.On the basis of typical physical properties and fluid parameters of a low permeability reservoir,the numerical simulation is conducted for the adaptability of continuous gas injection(CGI),constant water alternating gas(CWAG),and tapered water alternating gas(TWAG)for enhanced oil recovery and geological storage.The results show that three injection methods can obtain the highest cumulative oil production and CO_(2) storage capacity for the reservoir with the permeability of 1 mD.The working system constrained by the production gas-oil ratio(GOR)is more conducive to enhanced oil recovery or geological storage by CO_(2) flooding.CGI is more suitable for CO_(2) storage projects under 0.4 times the maximum GOR.CWAG is of more advantage in the project combining CO_(2) enhanced oil recovery with geological storage under 0.2 times the maximum GOR.TWAG is more suitable for CO_(2) enhanced oil recovery under 0.6 times the maximum GOR.
作者
丁帅伟
席怡
刘广为
刘骞
于红岩
DING Shuaiwei;XI Yi;LIU Guangwei;LIU Qian;YU Hongyan(State Key Laboratory of Continental Dynamics/Department of Geology,Northwest University,Xi’an City,Shaanxi Province,710069,China;National&Local Joint Engineering Research Center for Carbon Capture and Storage Technology,Xi’an City,Shaanxi Province,710069,China;Exploration and Development Research Institute,Changqing Oilfield Company,PetroChina,Xi’an City,Shaanxi Province,710018,China;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields,Xi’an City,Shaanxi Province,710018,China;CNOOC International Limited,Beijing City,100020,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2023年第2期104-111,共8页
Petroleum Geology and Recovery Efficiency
基金
国家自然科学基金项目“基于饱和度和不同尺度的湖相页岩力学响应机理研究”(41902145)
陕西省自然科学基础研究计划“基于响应面理论和粒子群算法的致密油藏CO_(2)吞吐数值模拟研究”(2021JQ-454)。
关键词
低渗透油藏
不同注入方式
提高采收率
CO_(2)地质封存
适应性
low permeability reservoirs
different injection methods
enhanced oil recovery
CO_(2)geological storage
adaptability
