摘要
根据低渗透油藏面积注水开发的特点,在四点井网注水单元的基础上建立流管模型,推导出考虑启动压力梯度的四点井网面积波及效率及油井见水时间的计算公式.提出低渗透储层四点井网面积注水的未动用因数的概念,用来表征四点井网不同井距和注采压差条件下的最终未驱替到的程度;利用油田实例进行计算分析,解决低速非达西渗流不同于达西渗流的面积波及效率理论计算问题,为低渗透油藏开发设计和评价提供理论依据.
According to the characteristics of the pattern water flooding exploitation in low-permeability reservoir,the stream tube model was constructed on the basis of 4-spot pattern flooding unit.Then,the areal sweep efficiency formula and water breakthrough time formula with consideration of the start-up pressure gradient were presented for the 4-spot pattern.The concept of non-sweep efficiency of 4-spot water flooding in low-permeability reservoir was put forward to characterize the ultimate undisplacement degree of 4-spot pattern in different injector producer distances and injector producer pressure differences.According to the calculation and analysis of actual oil production data,this theory solves the theoretical calculation problem of production well breakthrough time and areal sweep efficiency on the state of low-speed non-Darcy seepage flow different from Darcy seepage flow.This method provides theoretical foundation for the exploitation and evaluation of low-permeability reservoirs.
出处
《大庆石油学院学报》
CAS
北大核心
2010年第1期33-38,共6页
Journal of Daqing Petroleum Institute
基金
国家科技攻关重大专项(2008ZX05013-005)
关键词
启动压力梯度
低渗透油藏
四点井网
面积波及效率
见水时间
未动用因数
threshold pressure
low-permeability reservoir
4-spot pattern
areal sweep efficiency
water breakthrough time
non-sweep efficiency
