Abstract: Natural fractures that distribute randomly in the reservoir are different from the hydraulic fractures that connected with oil and water wells. Using the steady-state productivity equation, a conventional method, is difficult to theoretically deal with the randomly dispersed natural fractures. This paper presents the equivalent flowing resistance method, a theoretical model of steady-state flow for naturally fractured low-permeability reservoir, by which this issue can be solved through research of effects of natural fracture parameters on production rate and formation pressure as well as effects of hydraulic fracture parameters on fracturing well production rate. This model is characterized by simple and practical application with fully considering fracture parameters. The case study shows the reason that for low permeability reservoir, oil well and water injection well should be spaced where natural fractures are developed in order to reach better production response.

Key words: fracture, low-permeability reservoir, steady-state flow, theoretical model