关键词: 多层油藏, 砾石充填, 完井, 射孔, 压力评价

Abstract: The accurate evluation of gravel-packed well-completion pressure of multi-layer reservoir is significant for us to deepen the understanding of microscopic mechanism of formations protection and develop production of oil wells furthest.On account of the unreasonableness of the current methods a novel method is brought forth.As to multi-layer reservoirs,each layer can be divided into three areas:area of gravel-packing,area of perforation and area of radial flow.Each area has its own governing equaiton and the solution is expressed by Green function.The well bore pressure and layer-rate is given through Green function in Laplace space.The pressure drop and skin factor is obtained also in each area.In the end,a case of two-layer reservoir is studied and the reasonable conclusions are acquired by applying our novel method.

Key words: multi-layer reservoir, gravel-packing, perforation, pressure evaluation