CO_2在岩石孔隙介质内相态特征的超声波探测与分析  

Ultrasonic detection and analysis of phase behavior of CO_2 in porous media

作　　者：陈浩[1] 杨胜来[1] 宦康宁 马凯[3] 杭达震[4] 高祥瑞 杨建坤[1] 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [2]扬州广陵专用超声设备厂,扬州225002 [3]中国石油勘探开发研究院非洲所,北京100083 [4]冀东油田公司钻采工艺研究院,唐山063000 [5]长庆油田第一采油厂坪桥采油作业区,延安716000

出　　处：《分析仪器》2013年第6期52-56,共5页Analytical Instrumentation

基　　金：国家自然科学基金项目"超深层油气藏岩石物性垂向分布规律及渗流特征研究"(50874114);国家重点基础研究发展计划(973计划)"二氧化碳减排;储存和资源化利用的基础研究(2011CB707300)资助

摘　　要：岩心孔隙介质内的流体相态特征研究是实施CO2埋存及驱油的重要基础。本实验建立了一套超声波测试岩心孔隙介质内流体相态特征的新方法。通过声波探头及夹持器堵头一体化、端面抛光等手段,将声波探头直接作用于孔隙介质,解决了传统测试方法中探头不能承压、声波沿钢体绕射、能量损失过大等诸多问题,同时,自行研制了孔隙介质内流体相态探测声波发射、接收及信号处理软件,提高了测试精度,推动了超声波技术与油气田开发技术的交叉结合与应用发展。以吉林油田某区块天然岩心为例,测试了孔隙介质内CO2的相态特征,分析了孔隙介质对流体相态的影响。结果表明:该方法灵敏度高,数据可靠,避免了常规PVT方法中忽视孔隙介质影响的误差。Study on phase behavior of fluids in porous media is an important foundation for both CO 2 sequestration and CO2 flooding. In this paper ,a new method for ultrasonic detection of phase behavior of fluids in porous media was established. Based on integration of ultrasonic sensors and holder plug and end face polishing ,ultrasonic sensors were directly acting on porous and problems of conventional methods like not bearing pressure for sensors ,wave diffraction along steel holder ,large energy loss would be solved. In addition ,transmitting ,receiving and signal processing software was programmed and test accuracy was in-creased. Taking the natural cores of Jilin oilfield as an example ,phase behavior of CO2 in porous media was detected and the impacts of porous media were analyzed. The results showed that the method is highly sensitive ,the data is reliable and the errors of ignoring the impacts of porous media in conventional meth-ods were avoided.

关 键 词：孔隙介质 CO2 相态特征 超声波探测 声速 幅度 

分 类 号：TE31[石油与天然气工程—油气田开发工程]