页岩气复合递减模型解法再认识  

Recognition of solution of shale gas compound decline model

作　　者：刘刚[1] 孙建博[1] 史鹏[1] 王晖 LIU Gang;SUN Jianbo;SHI Peng;WANG Hui(Natural Gas Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an 710065,China)

机构地区：[1]陕西延长石油(集团)有限责任公司天然气研究院,西安710065

出　　处：《非常规油气》2025年第2期89-96,共8页Unconventional Oil & Gas

基　　金：“十四五”全国油气资源评价项目“延长石油矿业权区及周边空白区油气资源评价”(QGYQZYPJ2022-4);陕西延长石油(集团)有限责任公司项目“延长页岩气探区储量计算参数评价方法研究及应用”(YCSY2025JCYJ-B-12)。

摘　　要：页岩气复合递减模型原有解法存在参数迭代次数多及条件过于严格等诸多问题。对模型解法进行了针对性改进,并通过4口实际页岩气井的生产数据,完成了改进模型求解方法的应用效果分析。结果表明:1)在拟合效果分析方面,采用改进解法对4口井进行参数线性拟合时,拟合程度均在98%以上,实现了模型参数的高线性拟合;相应模型的单井产量拟合误差平均值小于6%,且均低于原有解法模型的拟合误差,表明模型改进解法具有更优的产量拟合效果。2)在拟合效率分析方面,对比了2种解法对应的参数拟合时间和参数拟合迭代次数,其中模型原有解法的参数拟合时间是模型改进解法的2.3~3.1倍,平均值为2.6倍;原有解法的拟合迭代次数是改进解法的16.7~24.4倍,平均值约为20.2倍,表明模型改进解法在实际应用中具有更高的拟合求解效率。The original solution of the shale gas compound decline model has problems,such as too many iterations of parameters,strict fitting functions,etc.The model solution was improved,and the production data from four actual shale gas wells were used to complete the application effect analysis of the improved model solution.The results show that:1)In the analysis of the fitting effect,the improved solution was used in four wells,and the fitting accuracy of parameters was more than 98%,which realized the high linear fitting of model parameters.The average fitting error of single well production of the corresponding model was less than 6%,and it is lower than that of the original solution model.It is proved that the improved model method has a better production fitting effect.2)In the analysis of fitting efficiency,the fitting time and the fitting iterations of parameters were compared between the two solutions;the fitting time of the original solution are 2.3~3.1 times that of the improved solution,the average is 2.6 times,and the fitting iterations are 16.7~24.4 times of those of the improved solution,the average is about 20.2 times,it is proved that the improved solution has higher efficiency in practical application.

关 键 词：页岩气 复合递减模型 模型解法改进 求解效率 解法再认识 

分 类 号：TE135[石油与天然气工程—油气勘探]