| After a large number of investigation on the literature abroad and inland,channeling phenomenon has become more serious with the development of the oilfield and secondary and tertiary oil recovery,which affects the normal production and development of oilfield,damages the formation greatly and brings us great economic losses.Thus,effectively monitoring the formation timely is very important to find channeling-path and take govern measures.Based on the investigation of domestic and foreign literature,first of all,this paper introduces the situation of cross flow and leakage in two directions of horizontal and vertical.Secondly,this paper summarizes several common formation monitoring technology,and discusses the advantages and disadvantages of various methods.In the end,the use of well testing technique is proposed to explain cross flow behind casing.The channeling-path was distinguished by water cut rising velocity curve and the type of the channel was determined as pore channel.The parameters of the existence channeling thickness,permeability and radius of pore channel was calculated.Using well test data for further research and analysis,then the dominant channel between injection wells and production wells was diagnosed with the dimensionless pressure drop plot.This paper established the double layer reservoir model with cross flow behind casing on the basis of existing double permeability formation model,and finally drew the corresponding curve charts with software,analysis the curve sensitivity through preset multiple various parameters,find that reservoir permeability,channel flow factor and skin factor all influence curve feature.On the basis of analyzing 3 typical wells from A zone with SWIFT software and relevant reservoir parameters were obtained.The validity of this method was conformed by comparative analysis.Finally,several important aspects that cause channeling was presented to prevent channeling from appearing and make recommendations.In addition,this paper also discuss this question regarding to the oil field water pollution. |
