特高含水期含水率与采出程度关系式  

Relationship between Water- Cut and Recovery Degree in Ultra- High Water- Cut Stage

作　　者：王小林[1,2] 于立君[2] 唐玮[2] 冯金德[2] 王东辉[2] 

机构地区：[1]中国地质大学,北京100083 [2]中国石油勘探开发研究院,北京100083

出　　处：《特种油气藏》2015年第5期104-106,156,共3页Special Oil & Gas Reservoirs

基　　金：中国石油天然气集团公司"十二五"油气田开发重大科技项目"不同类型油田开发技术经济政策及开发战略研究"(2011B-1103)

摘　　要：中含水期油水相对渗透率比(Kro/Krw)与含水饱和度(Sw)在半对数坐标中呈直线关系,而在特高含水期Kro/Krw与Sw在半对数坐标中将偏离直线关系,以二项式函数关系变化。根据特高含水期的油水渗流特征,结合分流方程和Welge方程,推导了新型的含水率与采出程度关系式。研究表明,在特高含水期,Kro/Krw与Sw在半对数坐标上的直线关系发生偏离后,含水率上升到某一特定值时,理论采出程度将小于原线性关系下所对应的采出程度,且理论计算值与实际值较为相符。研究成果对于特高含水期的开发规律认识及可采储量预测具有一定指导意义。In medium water- cut stage,relative permeability ratio( Kro/ Krw) varies linearly with the variation of water saturation( Sw) in semi- log coordinate system. However,this relationship between Kro/ Krwand Swdeviates linearity and follows binomial relation. According to oil- water flow features in ultra- high water- cut stage,a new relationship between water- cut and recovery degree was deduced by combining fractional flow equation and Welge equation. Research demonstrates that in ultra- high water-cut stage,there is a deviation in the linear relationship between Kro/ Krwand Swin semilog coordinate system in case of water- cut increasing to a certain value. The corresponding theoretical recovery degree was lower than that calculated by the original linear relationship,and this theoretical recovery degree was relatively consistent with actual recovery degree. This research result can provide certain guiding significance forrecognizing development regularity and predicting recoverable reserves in ultra- high water- cut stage.

关 键 词：特高含水期 含水率 采出程度 相对渗透率 含水饱和度 

分 类 号：TE341[石油与天然气工程—油气田开发工程]