关键词: 裂缝性油藏, 射孔, 有限元, 数值模拟, 回归, 产率比

Abstract: Underbalance perforating has been widely adopted as a standard for perforating to obtain the optimum perforating performance.However,almost all studies about perforating optimization did not take into account the presence of natural fracture reservoir.The productivity evaluation of perforated producing well becomes very complicated in the presence of natural fracture in reservoirs.The mathematical model has been established in this paper based upon the given three-dimensional physical model describing the characteristics of seepage flow in the naturally fractured reservoir and continuity equation. The equation of variation for the finite element derivation has been deduced for obtaining the solution of the elliptical boundary value problem.The study has acquired the quantitative analysis results about the influence of different perforation and formation parameters towards the productivity of oil well in the naturally fractured reservoir through mesh subdivision,finite element numerical modeling and quadratic regression analysis in orthogonal designing.The important points obtained are very valuable to direct the operation of perforating completion in natural fracture reservoirs

Key words: fracture reservoir, perforation, finite element, numerical simulation, regression, productivity ratio