苏北不同类型油藏CO_(2)驱开发模式及经济效益评价

CO_(2) flooding development models and economic benefit evaluation of different types of reservoirs in Subei basin

CO_(2)驱技术在国外应用广泛,而国内应用规模相对较小,重要因素是其技术和经济指标备受考验。以近年苏北小断块油藏CO_(2)驱项目为例,分析了CO_(2)吞吐、低渗油藏同步气驱、气顶驱、气水交替、中高渗油藏CO_(2)复合驱等开发模式,及其经济效益与影响因素。苏北实践表明CO_(2)驱项目经济效益与注入成本和换油率密切相关,各开发模式经济效益有一定差异但总体较好,特别是低渗低含水油藏通过气顶驱及气水交替驱效果较佳。

CO_(2)-EOR has been widely used in foreign countries,but rare in China because of technical and economic factors.Taking the CO_(2)flooding project of the small fault block reservoir in Subei basin as an example,the development modes of huff-n�puff,synchronous gas injection,gas cap flooding,gas-water alternation,CO_(2)combined flooding in medium and high permeability reservoirs are summarized,and economic benefits and influencing factors are analyzed.The practice in Subei basin shows that the economic benefits of CO_(2)flooding projects are closely related to the injection cost and utilization of CO_(2).The economic benefits of various development models are different but overall are good,which play a better performance in low permeability and low water cut oil reservoirs through gas cap flooding and gas-water alternate flooding.