注水井井口液面下降压降试井资料分析  

Fall-Off Well Test Data Analysis for Drawdown of Wellhead Liquid Level in Water Injection Well

作　　者：刘道杰[1] 田中敬[1] 黄淑荣[2] 

机构地区：[1]冀东油田勘探开发研究院,河北唐山063004 [2]大港油田测试公司,天津300280

出　　处：《油气井测试》2015年第2期24-26,30,共4页Well Testing

摘　　要：井口液面下降是注水井压力降落测试准确解释地层参数的最大障碍。压降测试时注水井井口液面下降的主要原因有两个:一是地层亏空严重;二是井壁附近存在有利于水迅速流入地层的大孔道或微小裂缝。基于油藏渗流机理,分析了注水井井口液面下降现象。根据DG油田注水井压降导数曲线特征,将井口液面下降压力导数曲线分为三类:"V"字型、"W"字型和无明显趋势,且不连续型。假设关井后有等体积流体流入井筒使得井筒液面不下降,应用校正注水井井口液面下降的试井解释模型分析三类压力导数曲线。通过实例分析与对比说明,该方法能够准确分析井口液面下降注水井试井资料,实用、可靠。Drawdown of wellhead liquid level is the biggest obstacle to interpret formation parameters accurately,when pressure drop is tested in water injection well. There are two reasons for it,one is that formation is in debt seriously,the other one is that near the well-bore exists large pore paths or the micro fractures which is helpful injected water flow into formation. Based on the mechanism of reservoir seepage,phenomenon of drawdown of wellhead liquid level in water injection well is analyzed. According to derivative curve feature of pressure drop in water injection well of DG oilfield company,the curves are classified into three groups,that are'V ' type,'W' type and no obvious trend and discontinuousness type. Assumed iso-volumetric fluid flowing into wellhole to keep liquid level still after closing the well,three kinds of pressure derivative curve are analyzed by the well test interpretation model for correcting wellhead liquid level drawdown of water injection well. By analysis and comparison of cases,it shows that the paper can provide a reliable and practical method for accurately analyzing water injection well test data as wellhead liquid level falls.

关 键 词：注水井 井口液面 曲线 地层参数 

分 类 号：TE353[石油与天然气工程—油气田开发工程]