Distribution And Potential Tapping Of Residual Oil Along Faults

Daqing oilfield has experienced development and mining many years.Daqing oilfield has entered the high water cut stage of development,and every oil layer has been floored at different levels.It is difficult to stuty the residual oil distribution in high water cut stage when Daqing oilfield is in the late stages of development.Reserve-balance factor is low,and stable production is difficult,and in space the residual oil is highly fragmented,so that conventional tapping is difficult.Currently,how to tap the residual oil cost-effectively has become a major issue to enhance oil recovery.However,due to segmentation fault of the multi-faceted,it is easy to form the residual oil retention area along fault.So that design the directional wells to tapphe residual oil along fault on the base of the dvelopmental characteristics of fault fracture zone and the configuration relationship between faults and reservoir.This has important implications for oil continued stable production.To solve this problem,for the study of xingbei development area of daqing oilfield,by fine structure analysising for the 41 focusing faults on the study area,we get the faults development characteristic,the configuration relationship between faults and reservoir,the micro-amplitude structures,the fault fracture zone and the fault sealing characteristics.Then we combine with fault edge well productivity data and develop dynamic data to analyze five controlling factors of the impact of residual oil along fault formed and distribution.And on the base of the deposition time unit flat microfacies,the single sand body identification,and the fine structural study,we combine with injection patterns,develop dynamic data,relationship between injection,and potential tapping of residual to find out enrichment layers and the types of residual oil and development potential horizons and location.Finally,combined with the principle of directional wells tapping,we establish a technical method of complex residual oil along fault laws and tapping residual oil along fault by drilling highly deviated wells,on the base of comprehensive analysising of construction,reservoir,faults characteristics and develop dynamic data.