The Investigation On Identification And Management Of High Water Consumption Layers In Stratified Reservoir

Nowadays,commingled injection and production method is widely adopted in the development of stratified reservoir.Because of the differences of reservoir as well as fluid parameters,the discrepancies of water intake intensity and amount are aggravated resulting in the appearance of high water consumption layers.In this research,firstly,based on the previous researches and the characteristics of high water consumption layer,the concept of high water consumption layer is well defined,besides,the cause of high water consumption layer is well analyzed from view of reservoir,fluid and exploitation.Next,numerical model are established and the influence of geology,fluid and exploitation parameters on the water cut curve,derivative of water cut curve as well as its eigenvalues are well analyzed.Then,on the basis of analysis of influencing factors mentioned above,high water consumption layer evaluation indexes,theoretical plates for the identification of dimensionless time at which peak appears,the identification and evaluation process for high water consumption layers in stratified reservoirs based on the method of Lorenz curve are established.The identification and evaluation method is verified in the practical well groups where high water consumption layers are developed.Finally,based on numerical models with different level of high water consumption layers,the optimum management methods are selected in order to provide theoretical basis in practical production.The results indicate this method is simple and reliable,it can effectively identify and evaluate the development of high water consumption layers in practical production.Besides,the management methods selected are targeted and can greatly improve economic efficiency.