2.A connection between Arps declinecurve and increase curve is analysed. A new increase curve which is equivalent to famous Arps declinecurve and its corresponding declinecurve have been presented.
4.② The new declinecurve at p=2 and q=1 is Hu Yundong declinecurve, it is a sindlar to Arps exponential declinecurve, so it has quite great practical value;
5.Based on Arps declinecurve equation this paper presents the autoregressive model for analyzing the production exponential declinecurve, the analysis is convenient and reliable.
9.The displacement characteristic of the water-drive curve shows the cumulative oil production-water cut linear relation and corresponds Arps exponential declinecurve.
10.Kopitov declinecurve was examined and two transformed formulae of it werepresented:one is general formula,the other corresoonds to the case with decline index n=0.5 of the Arps’hyperbolic curve.
