Method Of Distinguishing Seepage Channel Identification In X-well Area And Analysis Of Potential Of Remaining Oil

Preferential percolation path is a percolation path with low resistance formed gradually in partial oil layer as the result of the influence of underground geological condition and factors of production and development in the development of oil gas field.In the late development of oil field by water injection,it is caused that injection water passes this path preferentially due to the form of preferential percolation path,influencing the effect of oil-water displacement,causing that injection water injects invalidly so that it cannot be achieved to improve the production by water injection.Besides,preferential percolation path also influences the division and movement of underground surplus oil.Therefore,identification of oil reservoir preferential percolation path has a great significance to study on distribution law and tapping potential of surplus oil.Based on the study of many documents,this article carries out a comprehensive identification of preferential percolation path in X well area with the methods including rank correlation coefficient identification method,water drive curve identification method,well testing identification method and water absorption profile recognition method.And this article identifies the division of surplus oil with reservoir engineering method and numerical simulation method,studies the tapping resolution of surplus oil and evaluates the effect of surplus oil's management according to the distribution law of surplus oil.In this article's study,five achievements are following.1.The identification system,including rank correlation coefficient method of single well's filter,water drive curve method of the single well's checking,final confirm of well test analysis method and the confirm of imbibition profile's position,is formed,according to the features of preferential percolation path of oil reservoir in X well area.2.It is confirmed that evaluation index of oil reservoir preferential percolation path in X well area and the evaluation process,”oil reservoir – single well – single layer ”,of preferential percolation path.It is put that the technical limit of water control in extra high water cut stage.3.The 3-D geologic model of X-well area is established,and the remaining oil distribution model and prediction model are formed according to the established geological model combined with the results of the previous seepage channel identification.4.The surplus oil level and vertical distribution features in X well areas are studied using conventional reservoir engineering method(water drive curve method and phase permeability curve method).5.According to the current distribution law of surplus oil dynamic production features of oil reservoir in X well area,the tapping area of surplus oil in oil reservoir is divided.And tapping plan is designed referred to the production features in different area.And it evaluates arrangement effect and economic results of preferential percolation path.