低渗透油藏CO<subscript>2</subscript> 驱不同注入方式对提高采收率与 地质封存的适应性. (Chinese)

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. [ABSTRACT FROM AUTHOR]

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。 [ABSTRACT FROM AUTHOR]

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