A new method to calculate sweep efficiency of horizontal wells in heterogeneous reservoir

摘要

This paper discusses the development challenges of an offshore fluvial oil reservoir with horizontal wells.In highly productive sandstone reservoirs,horizontal wells suffer from uneven flow profile and subsequent premature coning effects because of sand heterogeneity and heel to toe effect.Moreover,excessively increasing the production rate or horizontal well length can increase the risk of limited sweep efficiency,resulting in remaining oil in the toe or poor sand with low permeability.First,we analyze the characters of fluvial oil reservoir focusing on sand architecture and heterogeneity.Second,the sweep efficiency was calculated by the production data.Finally,we optimize inflow control device(ICD)for several wells and compare the response of ICD wells with conventional screen completion wells.