Research On Optimizing The Water Injection Of Nuraly Oilfield

Nuraly oilfield is high heterogeneity sandstone reservoir with middle prosity and middle permeability. Recovery degree of J strata in the oilfield is 9.87%, water cut rate is 44.18%. The pressure is largely different among the layers. Production problems and contradictions have become increasingly prominent in the existing way of injection and production.Therefore, this thesis optimized the technical measures of J strata, based on the improvement and adjustment the injection-production wells.Firstly, this thesis has established a three-dimensional geological model of the J strata after making a detailed analysis of the reservoir characteristics.then demonstrated the rationality of the model through fitting degree of both poroperty parameters and OOIP. Secondly, It finished four layers production history matching using reservoir engineering and reservoir simulation methods, well fitting rate is 87.5%, simulation modle is proposed to entirely fit the wells which would be adjusted in the subsequent plan. Based on the numerical simulation modle and the production history,analysised the remaining oil distribution and enrichment regularity.We can acknowledge that affecting factors of the renmaining oil are heterogeneity, low well spacing densit,reservoir properties, unreasonable injection patterns, injection parameters and perforation.At last, we study and optimize the reasonable parameters,such as well spacing density, injection-production relations, injection parameters to complete flood pattern and put forward the application order of mian layer J-0,J-II to make guidance the next step of development adjustment in Nuraly oilfield and enhance its oil recovery.