Optimization of Well Pattern Using Horizontal Well for the Development of Low Permeability Reservoirs

Using horizontal well to develop reservoir was one of the important means for enhancing control extent of reserves and improving the effect of oilfield development.It was widely used in the oilfields of China.According to the reservoir adaptive conditions of horizontal wells,in low permeability and extremely low permeability oilfields such as Daqing Oilfield,Changqing Oilfield,horizontal wells were used as a major means for raising the deliverability of oil wells and oil production.Numerical simulation method and vector well pattern conception were used for studying well patterns for the development of fractured extremely low permeability reservoirs with primary fractures by using horizontal wells,4+5 reservoir in Wellblock 48 of Changqing Oilfield was used as a prototype of studying,mainly including the simulation analysis of well spacing,well pattern mode and optimization of water flooding extending orientation,thus a rational well pattern of waterflooding orientation was obtained.The result can be used for guiding the development of similar reservoirs.Optimization of well pattern is obtained.