Study On Comprehensive Adjustment Measures Of Reservoir With Edge And Bottom Water In N Oilfield

The N Oilfield is an edge-bottom water reservoir,which was exploited by natural energy in the early stage and water flooding in the later stage.Due to the lack of natural energy,the reservoir pressure has been decreasing,resulting in a decrease in production,and then through water injection development,the production has been increased.After a period of stability,the production declined again due to insufficient well pattern,insufficient water injection well points,and reduced formation pressure.At present,the oilfield has reached the middle and late stage of development,the water content of the reservoir increases rapidly,and the production of the reservoir gradually decreases.In order to improve the status quo of oilfield development,it is necessary to evaluate and analyze the effect of oilfield water injection development and adjust the water injection development method.In view of the above problems,the production dynamic data of each layer in the oilfield was first analyzed,and the results showed that the overall development effect of the M layer was moderate,and water injection should be strengthened to improve recovery;the overall development effect of the U layer was poor,and water injection should be strengthened to supplement formation energy.Secondly,combined with the characteristics of the geological structure of the oilfield and relevant data,the 3D geological modeling of the oilfield is carried out.On this basis,based on the geological model,a corresponding numerical model was constructed,and the dynamic data of the whole area and a single well were fitted historically.And analyze the distribution law of remaining oil in each layer.Finally,combining the reservoir engineering method and numerical simulation method,the production system is optimized,the optimal development well spacing is set as 1000 m,the formation pressure is maintained at 18.45 MPa,and the reasonable daily water injection volume should be 70 m~3/d,the reasonable oil recovery rate should be maintained between 3%and 3.5%,and the five-point well pattern is preferred for development.According to the ten-year index prediction,the optimized scheme can increase the oil production by 10.01×10~4t,the recovery degree can be increased by 0.82%to 23.11%,and the formation pressure can be increased by 0.824Mpa.