低渗透油藏CO_2驱超前注气可行性评价  

The Evaluation of Feasibility of Advanced Gas Injection by CO_2 Flooding in Low Permeability Reservoir

作　　者：李南 田冀 焦红梅 任仲瑛 

机构地区：[1]中海油研究总院开发研究院,北京100027 [2]北京石油机械厂,北京100083

出　　处：《科学技术与工程》2014年第20期194-197,共4页Science Technology and Engineering

基　　金：国家973重大专项(2011CB707305-005);重大专项(2011ZX05024-002-006)资助

摘　　要：从超前注水的机理入手,结合数值模拟与实际动态,对比了不同注入方式下井间的压力剖面,分析了超前注气对地层压力波及的影响,建立了不同注入方式下受效的评价方法。基于低渗透油藏存在的启动压力梯度、应力敏感、孔喉细小的储层特性,分析不同注气方式对油井、注气井及地层压力的抬升幅度、采出程度以及混相效果等的影响;基于以上特点,超前注气可以有效地解决超前注水效果差或油井开井后暴性水淹等实际现象;并以大庆油田YSL区块为例,进行了不同注气方式下的开发效果分析,评价了超前注气的开发效果,对低渗透油藏开发技术政策的制定具有一定的指导意义。Starts from the mechanism of advanced water injection,combines with the numerical simulation and actual production data,the pressure profiles under the diffurent injection mode is contrasted.The water injection timing in ultra low permeability reservoirs,and under the optimal water injection timing is optimized.The effect on transmission of pressure by different ways of advanced gas injection,builds the effect evaluation method of different injection ways is analyzed.Based on low perrmeability reservoirs property exists start-up pressure gradient,stress the sensitive,thin pore throats,the effect on the lifting amplitude of oil wells,gas injection wells and the oil recovery and miscible affection by the different ways of advanced injection is analyzed.Advanced gas injection solves the poor effect of advanced water injection and the practical phenomenon of oil well critical flooding.Taking Daqing YSL oilfield for example,the development effect has been analyzed under the different gas injection,and the development effect of the method of advance gas injection,which has certain directive significance to set the technology policy is evaluated.

关 键 词：低渗透油藏CO2驱 超前注水 超前注气 开发效果 波及体积 

分 类 号：TE341[石油与天然气工程—油气田开发工程]