Abstract: Abstract:For the feasibility of water flooding with multifractured horizontal wells in ultralow permeability reservoirs, using the streamline simulation, this paper studied the production dynamic behavior of the system including one injector and one producer with multifractured horizontal wells and then discussed the controlling factors affecting the systems water flooding. Simulation results show that without fracture channeling, horizontal wells can increase the injection volume and enhance the production rate and recovery. Its conducive for water flooding when the fracture distribution is not symmetric and the fracture penetration ratio is between 02 and 04. However, fracture channeling will increase the risk of water flooding with multifractured horizontal wells. Fracture channeling at the wellbores edge or multifracture channeling will accelerate the water breakthrough, thus fractured horizontal wells will lose their advantage. When the geological environment is stable and the fracture scale can be controlled, the experiment of water flooding with multifractured horizontal wells can be done. Results from this study can provide theoretical support for water flooding with multifractured horizontal wells in ultralow permeability reservoirs.

Key words: ultralow permeability reservoir, multifractured horizontal well, water flooding, streamline simulation, fracture channeling