摘要
在Willhite油水两相相渗关系式上,采用二项式表征油相指数与含水饱和度之间关系,出现了油相相渗曲线随含水饱和度的增大而不单调递减的现象,表明利用二项式表征油相指数与含水饱和度之间关系还存在不足,理论上也论证在油水两相流动区间可能存在突变。为了防止出现此类现象和方便油水相渗比值关系式待定参数得确定,文中提出了一种新的油水两相相渗关系式,即采用线性表征油相指数与含水饱和度之间关系,二项式表征水相指数与含水饱和度之间关系。这样处理,一方面可以确保油相相渗随含水饱和度单调递减,另一方面,水相相渗关系式可以描述弓背式水相渗流变化特征。最后,通过红台油田西山窑组油藏23区块的应用,新的油水两相相渗关系式及其油水相渗比值关系式拟合精度高、效果好,为进一步深化水驱油特征研究奠定了可靠的数理分析基础,值得其他油田借鉴。
In the Willhite formula of oil-water phase Relative permeability,the relationship between the oil phase index and the water saturation is characterized by binomial expression,so that the curve of oil phase relative permeability is not monotonously decreasing with the increase of the water saturation,where Binomial formula has some shortcoming,and the curve of oil phase Relative permeability possibly arise bad point in oil-water two-phase flow region.To prevent the occurrence of such phenomena and easily determine the formula of oil-water relative permeability ratio,a new formula for oil-water relative permeability is proposed,the relationship between index of the oil phase and thewatersaturationischaracterizedbylinearity,meanwhile,therelationshipbetweenthewaterphaseindexandthe water saturation is characterized by binomial expression.This guarantees that the curve of oil phase permeability is monotonously decreasing with the increase of water saturation and the formula of water phase permeability can deal with top convex curve feather.At last,by applying Block23of Xishanyao reservoir in Hongtai Oilfield,the new formula gets better fitting accuracy so as to establish a solid foundation for mathematical analysis for the further research on the characteristics of water flooding,which is worth providing reference for other oil fields.
作者
蔡喜东
李东东
宋成元
赵嗣君
郭克成
CAI Xi-dong;LI Dong-dong;SONG Cheng-yuan(Research Institute of Exploration and Development,Tuha Oilfield Company,PetroChina,Hami,Xinjiang 839009,China)
出处
《新疆石油天然气》
CAS
2018年第4期61-66,108,共7页
Xinjiang Oil & Gas
基金
中国石油天然气集团公司科技重大专项(2017E-04-07)
作者简介
蔡喜东(1983-),男,宁夏银川人,工程师,主要从事油气田开发研究
