| The Remaining Oil is generally refers to the residual oil of reservoir,It still can’t be extracted after some kind of oil extraction method,the remaining oil distribution is the focus in the oilfield development both at home and abroad.The Donghe sandstone reservoir already entered the high water-cut stage,into the middle and late stage of development,it is harder for oil and gas exploitation,facing the problem of stable production and increase production,study on remaining oil distribution of reservoir has become the urgent needs to be resolved.This study is based on the Injection and Production Well Group of Donghe Sandstone Reservoir,the water injection effect is divided into 5 types: the onrush type,the obvious type,the stable type,the weak type,the invalid type,according to the dynamic production characteristic of production wells.The dynamic response characteristic of 5 types of water injection effect are summarized based on the analysis of dynamic monitoring data.Static geological factors and dynamic development factors affecting the distribution of remaining oil were analyzed comprehensively,combining reservoir geologic characteristics,and the remaining oil distribution models of these influencing factors were established.Through the analysis to dynamic development characteristics and static geological factors of the reservoir,the distributing disciplinarian of remaining oil distribution between wells of 5 water injection effect types are summarized,combining the study on influencing factors of remaining oil,and the model of remaining oil distribution between wells were established.Some corresponding production suggestions are given to develop the remaining oil for 5 types of remaining oil distribution between wells of the reservoir,such as the adjustment of production wells,the adjustment of injection-production system,the profile control and water flooding and the reconstruction of oil layer. |
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