摘要
在油井进行提液生产时,当井底流动压力低到一定界限后,随着它的进一步降低,油井产油量会降低。为此,在考虑提液过程中原油脱气、储层渗透率下降等因素影响的前提下,通过对油相相对流动能力和储层渗透率进行修正,建立了新型的油井流入动态方程。通过对油井流入动态方程进行求导,得到了油井最大产油量点所对应的最低允许流动压力,提液井合理的井底流动压力应当控制在最低允许流动压力与地层压力之间。实例计算结果表明,作图法与求导法得到的最低允许流动压力相对差值小于1%,完全符合工程要求。通过新建油井流入动态方程,对影响井底流动压力的油藏开发参数进行分析后发现,随着渗透率变化系数、地层压力的减小和油井含水率的增加,油井最低允许流动压力减小。
There is a problem in the water flooding reservoir with liquid enhanced to increase the oil production. The oil production will reduce with the bottom-hole pressure to a further reduction, when the bottom-hole pressure reduces to the critical value. In view of this problem, a new inflow performance curve equations is established by modifying the relative mobility of the oil phase and reservoirs permeability in the paper. In the equations, the degassing of crude oil in formation, the reduction of permeability and other factors are considered. After obtaining the derivative of the inflow performance curve equations, the lowest bottom hole flowing pressure to the maximum oil production of oil well is found. The reasonable bottom hole flowing pressure should be between the lowest bottom hole flowing pressure and formation pressure. In the example, two methods plotting method and derivation method are put forward to calculate the lowest bottom hole flowing pressure, the relative difference is within 1%. The result indicates that it is in accordance with engineering requirements. Based on this, the influence of reservoir development parameters on the bottom hole flowing pressure are analyzed. The results show that the lowest bottom hole flowing pressure is decreased in accordance with the permeability change coefficient, formation pressure reducing and the water cut of oil well increment.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2011年第3期74-76,89,共4页
Petroleum Geology and Recovery Efficiency
基金
中国石化股份科技攻关项目"特高含水油藏水驱新特征研究"(P10076)
关键词
提液流入动态
渗透率
流动压力
饱和压力
地层压力
油藏参数
liquid enhancement
inflow performance
permeability
flowing pressure
bubble point pressure
formation pressure
reservoir parameters
