Permeability heterogeneity in plane is an important characteristic of fluvial facies formation. If it is developed using conventional five-spot well arrangement with equal-well-space

the injection water often fingers along high permeability strip quickly

which results in early water-breakthrough and quick water-cut increase for parts of the wells

while wells in relatively low permeability strips can not be flooded effectively; water does not break through as total water-cut for a well group reaches 98 %. That is

the reservoir can not be flooded in equilibrium

and the developing result is not good. The design formula for well space of vectorial well arrangement for permeability heterogeneity in plane is derived based on porous flow theory. According to the well space formula of vectorial well arrangement

the physical models are made to carry out the contrastive water flooding experiments which are used to check the validity of vectorial well arrangement. The results indicate that the vectorial well arrangement can improve the plane sweep factor for reservoirs with permeability heterogeneity

and raise the efficiency of injection water; moreover

it could improve the developing effect greatly.