用增长曲线一体化法预测水驱油田开发指标  

A Method for Intergrative Prediction of Development Index of Waterflooding Reservoirs

作　　者：罗洪[1] 俞启泰[1] 

机构地区：[1]中国石油勘探开发科学研究院

出　　处：《断块油气田》2001年第3期19-24,共6页Fault-Block Oil & Gas Field

摘　　要：建立一种新的油藏工程方法———增长曲线法 ,在预测油田Np-t和Qt-t关系中已是一种相当成熟和成功的方法 ,但水驱油田的 fw-t关系也是一个非常重要的开发指标。本文推导了利用 3Y1、3W和 3Y2增长曲线描述和预测 fw-t关系的公式 ,并提出了用于求取其参数的过原点重复线性回归法。随机选取了低粘 (地层原油粘度 μo<3mPa·s)的兴隆台油田、中粘 ( 3≤μo≤ 3 0mPa·s)的双河油田和高粘 ( μo>3 0mPa·s)的孤东油田 ,用上述 3种增长曲线拟合这 3个油田实际的Np-t、Qt-t和fw-t数据 ,根据拟合相关系数的大小 ,筛选了用同一种增长曲线计算上述开发指标的结果。理论分析表明 ,3Y2增长曲线在Qt-Np关系后期为向上凹的曲线 ,说明产量下降和含水上升均较慢 ,这符合高粘油田的水驱特征 ;而 3Y1增长曲线在Qt-Np 关系后期为向下凹的曲线 ,表明产量下降和含水上升均较快 ,这符合低粘油田的水驱特征 ;而中粘油田则介于两者之间。The growth curve method, which is a new kind of reservoir engineering method, has already been a quite mature method for predicting relationships of cumulative production N p, vs time t , production Q t, vs t . But water cut f w vs t of the water flooding reservoirs also is a very important development index. In this paper, the formulae for discribing and predicting the relationship of f w vs t have been derived by using 3Y1, 3W and 3Y2 growthcurves, and the repeated linear regression methods for obtaining the parameters of these growth curves have been proposed. Xinglongtai Oilfield with low formation oil viscosity(formation oil viscosity μ 0. <3mPa·s), Shuanghe Oilfield with middle formation oil viscosity(3 mPa·s≤u 0≤30 mPa·s)and Gudong Oilfield with high formation oil viscosity (u 0> 30 mPa· s) were selected random, then the relationships of N p. vs t , Q t, vs t and f w vs t were fitted by actual data of these oilfields, and according to larger or smaller of the correlation coefficient, the growth curves applying to different kinds of oilfield were screened. The results screened are: the 3Y2 growth curve applies to high oil viscosity oilfields and the 3Y1 growth applies to middle and low oil viscosity oilfields, where as additional method to 3Y1 growth curve, 3W growth curve can apply to middle oil viscosity oilfields when cumulative production corresponding to peak production is greater than half maximum re coverable reserves. The theoritical analysis shows that:① in the later section of relationship of Q t, vs N p, 3Y2 growth curve is a concave curve upward that indicates the rise of water cut and decline of production both are slower, it accords with water displacement characteristics of waterflooding reservoirs with high formation oil viscosity;② in the later section of relationship of Q t vs N p , 3Y1 growth curve is a concave curve downward that indicates that rise of water cut and decling of production

关 键 词：水驱油田开发 增长曲线一体化法 产量 累积产量 含水率 预测 

分 类 号：TE341[石油与天然气工程—油气田开发工程] TE328