油气井产量递减分析新方法

针对油气田产量递减规律,广大研究者提出多种产量递减模型,如:Arps模型、SEPD模型、Duong模型以及它们之间的组合模型等。在实际生产中,由于递减模型种类繁复,使用条件不同等原因,在应用递减分析时难以选择最优递减模型。通常做法是利用线性拟合或非线性拟合方法拟合实际生产数据,通过相关系数高低来确定选择的模型,这种选择办法需对每种模型都进行拟合,计算工作量较大。鉴于此,提出一种新的产量递减模型,通过理论验证,确定新模型既包含Arps递减规律,也涵盖SEPD模型和Duong模型。实际生产数据分析表明,该方法拟合精度高,适用范围广,可有效避免模型选择问题,为递减分析方法选择提供了依据。

New method for analysis of oil and gas well production decline

According to the study of production decline law of oil and gas fields,many researchers have proposed a variety of production decline models,such as Arps model,SEPD model,Duong model and combination model. In practical production,due to the variety of declining models and different use conditions,it is difficult to choose the optimal decline model because of the complexity of decline models and different conditions.The usual practice is to fit the actual production data by linear fitting or nonlinear fitting method,and determine the selected model by the correlation coefficient. When use those methods,you will waste time on fitting each model. Based on this,a new production decline model is proposed in this paper. Through theoretical verification,it is determined that the model includes not only Arps decline law,but also SEPD model and Duong model. Through the analysis of actual production data,the method has high fitting accuracy and wide application range,which can effectively avoid the problem of model selection and provide a basis for the selection of decline analysis method.