Study On Optimization Of Injection And Production Adjustment Of Gaotaizi Reservoir In South Second And Third District

Most of China's oilfields are developed by waterflooding.After decades of development,most of the water flooding fields have entered the late stage of water flooding development,which means high water content or high water content.Daqing oil field south three high platform overall for three kinds of reservoir formation and the late oilfield waterflood development has been achieved for determining,the main problem with oil and water Wells ratio on the high side,block for water flooding control degree is low,poor thin oil layer is relatively thick oil layer using small proportion,blocks of natural decline rate and water cut rising velocity on the high side,therefore,the south three high counter reservoir injection-production adjustment optimization technology can effectively increase the reservoir recovery efficiency.In order to improve the two three high counter reservoir development effect,this article is first waterflood technology at home and abroad as well as seismic attribute analysis technology,summarized the research status,research direction,by using the well seismic joint interpretation technology,using the injection profile,fluid producing profile,comprehensive analysis method,sealed coring data analysis,the new experimental spot well water flooded layer interpretation result analysis,through the numerical simulation analysis,accurate for residual oil distribution law.On this basis,finally studies the three south high counter reservoir injection-production system adjustment of three technologies: one is to adjust the high platform pattern encryption method,determines the thick oil reservoir reasonable injection-production well spacing is 250 m,poor thin reservoir reasonable injection-production well spacing should be controlled between 150-200 m.Reservoir high table 2 it is with the injection-production system adjustment,the basic pattern in linear injection Wells row between the forming rules of 250 m five area based the well pattern,an encryption and 175 m area well pattern well spacing five subregional injection-production system adjustment model,and the failure of fill hole on the object,using different types of sand body of the salt two adjustment way;Three is by studying the high platform reservoir republican adjustment supporting technology for the system played an important role in security,mainly including the new well completion methods and relevant technical limitations,Wells line segment,the original well pattern cycle water injection mode,the failure of fracturing technology specification four supporting technology.Through the south three high counter reservoir injection-production system adjustmenttechnology application,south three old nissan oil increased 0.2t,water cut down by 0.45%,the new well early production capacity,nissan oil is higher than design 1t;The effective proportion of three to above is increased by 19.8%,and the accumulative oil of the filling well is 2.13×104t.Block sandstone and effective thickness of water absorption increased by 10 percentage points;Annual water content increased by 1.20%;Increase the recovery rate by2.51 percentage points and increase recoverable reserves by 238.2 × 10~4 t.