The lens lithologic reservoir with low permeability is characterized by scattered distribution and strong heterogeneity of sand body. During the process of development,the core is seriously flooded and the water flooding effect in fan edge is poor. Therefore,based on the method and theory of reservoir engineering,the calculation methods of ring spacing of annular wells and well spacing of oil well were established,and the calculation chart was drawn. At the same time, the rational pattern well spacing for l...