摘要
水驱曲线法、童氏图版法及Arps递减曲线法是目前最常用的油藏工程方法,但上述方法受到假设条件和统计数据不足的局限,在应用中存在适用范围不够宽、预测精度不够高等问题。根据Welge线性方程,推导出童氏图版系数的计算公式,改进了童氏图版;结合Welge线性方程和微分方程,进一步探讨了理论水驱曲线,引入了水驱前缘突破时基于单位液量的产量变化率即递减率的概念,并给出了相应的计算公式;基于相渗曲线幂函数表示法,将前缘含水饱和度微分方程转变为线性方程,得到了Welge系数的计算公式,同时还推导出近似理论水驱曲线,并给出了近似理论水驱曲线的参数解法。改进后的童氏图版及新型水驱曲线,理论基础更加扎实,适用范围更宽,预测精度更高。
The water flooding curve method,Tong's chart method and Arps decline curve method are the most commonly used reservoir engineering methods,whereas the above methods are limited by assumptions and statistical data,thus their application range is not wide enough and the prediction accuracy is not high enough during applications.According to the Welge linear equation,the calculation formula of the Tong's chart coefficient was derived,and the Tong's chart was improved.Combined with the Welge linear equation and the differential equation,the theoretical water flooding curve has been further discussed,and the concept of unit liquid production changing rate while the breakthrough of water flooding front occurs,namely the decline rate,was introduced,and the calculation formula was provided.Based on the power function expression of relative permeability curve,the differential equation of frontal water saturation was transformed into linear equation,and the calculation formula of Welge coefficient was obtained.The approximate theoretical water flooding curve was derived and the parameter solution of the approximate theoretical water flooding curve was obtained.The modified Tong's chart and the new water flooding curve exhibit a more solid theoretical foundation,wider application range and higher prediction accuracy.
作者
张金庆
ZHANG Jinqing(State Key Laboratory of Offshore Oil Exploitation,Beijing 100028,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2019年第1期86-93,共8页
China Offshore Oil and Gas
基金
"十三五"国家科技重大专项"海上稠油高效开发新技术(编号:2016ZX05025)"部分研究成果
关键词
水驱曲线
童氏图版
递减曲线
Welge线性方程
相渗曲线
递减率
water flooding curve
Tong's chart
decline curve
Welge linear equation
relative permeability curve
decline rate
