利用RTA解释技术对注水井动态评价  

RTA-based dynamic evaluation of water injection wells

作　　者：高杰[1] 袁玉凤 冯青[1] 杨慰兴 GAO Jie;YUAN Yufeng;FENG Qing;YANG Weixing(Production Optimization Business Division,China Oilfield Services Limited,Tianjin 300459,China)

机构地区：[1]中海油田服务股份有限公司油田生产事业部,天津300459

出　　处：《油气井测试》2022年第5期75-78,共4页Well Testing

摘　　要：注水井由于水质、地层物性、施工等因素影响,易造成水井停产停注,常用的动态分析法缺少对水井定量评价。将RTA解释技术应用到注水井中,利用注水井井口压力及注水量数据,结合不稳定试井理论,拟合注水井史及双对数诊断曲线,获得注水井地层参数及边界信息,与地质油藏认识相结合,提高解释精度。以X油田C1、C2井为例,采用RTA解释技术对欠注原因进行分析,认为C1井地层物性、连通性差,C2井储层污染严重。该方法可快速获得地层参数,为注水井动态分析提供一种新的方法。Production and injection of water injection wells may stop due to the influence of water quality,formation physical properties,operation and other factors,but common dynamic analysis methods rarely evaluate the water injection wells quantitatively.This paper introduces the rate transient analysis(RTA)method into the dynamic evaluation of water injection wells.Using the wellhead pressure and water injection volume data of the water injection well,and according to the theory of pressure transient well test,the water injection well history and log-log curve were fitted to obtain the formation parameters and boundary information of the water injection well,which are then combined with the geological understanding of reservoir to improve the interpretation accuracy.Taking Wells C1 and C2 in X oilfield as examples,the causes of insufficient water injection were analyzed by RTA.It is found that the reservoirs in Well C1 have poor physical properties and connectivity,and the reservoirs in Well C2 are seriously damaged.The proposed method can quickly obtain formation parameters,and it provides a new method for dynamic evaluation of water injection wells.

关 键 词：注水井 RTA解释技术 注水量 动态评价 表皮系数 等效时间 双对数曲线 

分 类 号：TE353[石油与天然气工程—油气田开发工程]