By the analysis of the affix‘ge(圪)、zi(子)、hu(忽)、da(达)、ri(日)、tou(头)、lao(老)’,the decrease tendency of the affix in Hebei dialect through its development is introduced in this paper and by the analysis of the decrease feature of‘ge(圪)、zi(子)、hu(忽)、da(达)’the function of the meaning in the decrease of the affix in Hebei dialect is disclosed in some degree.

It is also shown that the DRHR property can be preserved under non-homogeneous Poisson shock model with increasing concave cumulative rate of occurrence.

Meanwhile,the author divides the oilfield production decline rate into the liquid production rate natural decline and t.

A differential equation for production decline rate is set up based on the study of variation of production decline curve,by which the dimensionless decline equation for describing the production decline rule is deduced.

In order to increase prediction accuracy of development blocks with short production history,this paper introduces multiple regression method through three following aspects: prediction of decline index and initial decline rate;prediction of annual decline rate;prediction of injection-production ratio.