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双重介质低渗油气藏，往往存在低速非达西渗流，故该类油气藏的油气井试井分析更具复杂性。在考虑井筒储集和表皮效应的前提下，建立了双重介质油气藏低速非达西渗流有效井径试井的数学模型；采用数值反演法，绘制了无限大地层条件下的典型曲线；讨论了不同参数条件下曲线的特征以及应用方法。该成果可进一步推广到双渗透模型和复合模型中，以解决复杂油气藏的试井问题。

MATHEMATICAL MODEL AND TYPICAL CURVE FOR CALCULATING EFFECTIVE HOLE DIAMETER IN THE LOW VELOCITY NON DARCY FLOW TESTING OF DUAL MEDIA RESERVOIRS

Low velocity non Darcy flow of dual media oil gas reservoirs with low permeability often makes well testing analysis more complicated.Taking well bore storage and skin effect into consideration,a mathematic model for calculovting effective hole diameter in the low velocity non Darcy flow testing of dual media reservoirs is set up.The typical curve in infinite formation condition is drawn up by numerical inversion method.The characterstics and applocation of the curve are discussed for various parameter conditions.This reaserch results can be further spread to double permeation model and complex model to solve the well testing problem of complex oil gas reservoirs.