Research Of Well Network Optimization Methods In Zhao 212 Region

After the development of water injection for over 8 years, there is a quite obvious direction for well leakage and flooding in the Zhao 212 region. In the west-east direction, the leakage and flooding for injection well is earlier, and water saturation rises faster, even for some of the wells water floods severely in a short time. However, the effect of water injection no longer performances so good in other directions, and well pressures is affected by well location change. When the injection pressure goes high, on dynamics it is apparent that reservoir will develop into fracture reservoir.After a study found that Zhao 212 Region development nearly north-south, north west and north east to the four groups of structural fracture, was "m" word distribution, the development degree turn from strong to weak. The simulation results from the stress field of view, the distribution of principal stress orientation is relatively stable, only some changes near the fault. Maximum and minimum principal stress distribution controlled by local structures, the stress and high values are mainly distributed in north-central area and the Midwest, in the eastern and southern lower stress.Regarding of the problems above, the different practical problems and properties are further analyzed, reasonable well network, well spacing, optimization are worked on, and through numerical simulation the ultimate optimization encryption adjustment is decided as Diagonal Encryption, later it gradually transits into linear injection well network, in order to reduce adverse effect of cracks, and finally it becomes a efficient way to improve oil field development effect. From the development index forecasting and economic evaluation of the optimal encryption development well, we can predict the recovery can be increased by 5 percentage points as long as oil prices $ 50 per barrel.The sensitivity analysis of economic evaluation show that the economic benefits of encryption scheme is most sensitive to oil prices,the second is investment. It is not sensitive to the operating costs, So lower investment and other measures are recommended to improve risk-adjusted level of encryption development well.