摘要
根据大庆油田30口探井的原油物性实测资料检验了Standing,Lasater和Vasquez-Beggs等提出的预测地层原油的气油体积比的模型精度.结果表明,这三个模型对大庆原油预测的符合率较低,计算值与实测值相对偏差的绝对值≤10%的数据频率分别为20.0%,30.0%和43.3%;相对偏差的绝对值≥100%的数据频率分别为16.7%,6.7%和10.0%.相对比较,Vasquez-Beggs模型的准确度较高,但由于该模型对于不同重度的原油采用了2套常系数,导致了气油体积比与重度的关系曲线上出现断点,即出现了模型计算值不合理的现象.分析了产生偏差的原因,认为海、陆相原油性质差别大;模型中仅用相对密度来表征气体性质不甚合理.
Predicting models for gas-oil ratio of reservoir oil, which were put forward by Standing, Lasater, and Vasquez-Beggs respectively, have been verified by the PVT parameters of oil from 30 exploration wells in Daqing Oilfield. The results indicate that the predicted values of these three models are not accurate enough for Daqing oil. When the absolute value of the relative deviation between calculated values and measured data is less than 10%, the data frequencies are 20%,30% and 43% for Standing's, Lasater's and Vasquez-Beggs' models respectively. And when the absolute value of the relative deviation is larger than 100% the data frequencies are 16.7%, 6.7% and 10.0% respectively. Vasquez-Beggs model is more accurate than the other two. But because two constant coefficients have been used it results in the discontinuity of relation curve of R_s vs. API gravity of oil, therefore, the calculated values of the model reveal unreasonable results. Based on the analysis of the cause of deviation, we find that there is great difference between marine and continental crude oil. We may conclude that it is not reasonable to use only a relative density to express properties of gas.
出处
《大庆石油学院学报》
CAS
北大核心
2004年第1期1-3,共3页
Journal of Daqing Petroleum Institute
基金
国家重点基础研究发展规划项目(G1999043307)
黑龙江省杰出青年基金资助项目(200003)
