CO_(2)驱气机理与提高采收率评价模型  被引量:23

Mechanism and calculation model of EOR by CO_(2) flooding

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作  者:王高峰[1] 廖广志 李宏斌 胡志明[1,3] 魏宁 丛连铸[2] WANG Gaofeng;LIAO Guangzhi;LI Hongbin;HU ZhiMing;WEI Ning;CONG Lianzhu(Research Institute of Petroleum Exploration and Development,Beijing 100083,China;PetroChina Exploration&Production Company,Beijing 100007,China;Department of development of PetroChina Daqing Oilfield,Daqing,Heilongjiang 163002,China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China)

机构地区:[1]中国石油勘探开发研究院,北京100083 [2]中国石油勘探与生产分公司,北京100007 [3]中国石油大庆油田开发事业部,黑龙江大庆163002 [4]中国科学院武汉岩土力学研究所,湖北武汉430071

出  处:《油气藏评价与开发》2022年第5期734-740,共7页Petroleum Reservoir Evaluation and Development

基  金:中国石油科技项目“CO_(2)驱提高气藏采收率可行性研究”(ks2021-01-04);“老气田废弃气CCUS-EGR/CCS研究与试验”(kt2022-9-8);国家科技重大专项“页岩气气藏工程及采气工艺技术”(2017ZX05037)。

摘  要:中国天然气探明储量巨大,但实现天然气长期规模稳产,面临复杂气藏提高采收率等系列挑战,尤以页岩气、煤层气和致密气等非常规资源为甚。碳中和背景下,驱气类CCUS(碳捕集、利用与封存)技术具有广阔应用前景。将CO_(2)驱提高天然气藏采收率的主要机理总结为优势吸附置换、连续对流排驱、补充气藏能量3种类型,并认为吸附态、游离态和溶解态这3种天然气的赋存状态划分适用于所有类型气藏,推导获得了CO_(2)驱提高气藏采收率效果预测方法。应用该方法进行测算认为,CO_(2)驱有望提高页岩气采收率20个百分点以上。为突破大幅度提高天然气采收率技术,建议针对具有较好碳封存条件的气藏开展CO_(2)驱提高天然气采收率潜力评价,优选目标气藏进行经济可行性评估,并开展多种类型的CO_(2)驱提高气藏采收率重大开发试验,检验烟气组分协同驱替效果和扩大CO_(2)波及体积技术。The proved reserves of natural gas in place in China is huge.However,realizing the long-term large scale stable production of natural gas faces a series of challenges such as enhanced gas recovery(EGR)of complex gas reservoirs,especially for those unconventional resources such as shale gas,coalbed methane and tight sand gas.Under the background of carbon neutralization,CCUS-EGR technology has broad application prospects due to owing the functions of increasing gas rate and carbon reduction.The main EGR mechanisms for CO_(2) flooding are summarized into three types:substitution due to dominant adsorption of carbon dioxide,continuous convective displacement and gas reservoir energy supplement.Under the consideration that the classification of occurrence states of the adsorbed,free and dissolved natural gas are applicable to all types of the gas reservoirs.The prediction method of increased natural gas ultimate recovery factor by CO_(2) flooding is further deduced.It is found that CO_(2) flooding is expected to improve shale gas recovery of more than 20 percentage points by this method.In order to break through the technology of greatly improving natural gas recovery,it is suggested to evaluate the potential of CO_(2) flooding to improve natural gas recovery for gas reservoirs with good geological sequestration conditions,assess the economic feasibility of CCUS-EGR technology applying in target gas reservoirs,and carry out major pilot tests of CO_(2) flooding in various types of gas reservoirs.The synergistic displacement effect of flue gas components and the technology of expanding CO_(2) sweeping volume should be focused especially.

关 键 词:非常规气藏 CO_(2)驱气机理 提高采收率评价模型 重大开发试验 烟气组分协同驱替 扩大波及体积 

分 类 号:TE357[石油与天然气工程—油气田开发工程]

 

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